Impeller of fan and fan

Abstract

The impeller of the draught fan comprises a first end plate, a second end plate and a plurality of blades, an air inlet is formed in the first end plate, and the second end plate and the first end plate are oppositely arranged in a spaced mode; the multiple blades are distributed in the circumferential direction of the impeller at intervals, each blade is provided with a blade rear edge deviating from the axis of the impeller, each blade rear edge comprises a first section, each first section obliquely extends in the direction away from the first end plate, and the inclination direction is opposite to the rotation direction of the impeller during working. According to the impeller of the fan, the first section is arranged on the rear edge of the blade and obliquely extends in the direction away from the first end plate, and the inclination direction is opposite to the rotation direction of the impeller during working, so that the blade forms an inclined molded surface, air flow separation on the surface of the blade during working of the impeller can be reduced, and the service life of the impeller is prolonged. The pneumatic efficiency of the impeller is improved, and the air volume and efficiency of the fan are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an impeller of a fan and a fan. Background Art

[0002] The fan drives the impeller to rotate through the motor to achieve gas suction, acceleration and discharge. The motor provides power for the fan to drive the impeller to rotate. The impeller is the core component of the fan, and its internal gas flow efficiency directly determines the performance and efficiency of the whole machine. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide an impeller of a fan, which can reduce airflow separation on the blade surface and improve the aerodynamic efficiency of the impeller.

[0004] Another object of the present invention is to provide a fan, comprising the aforementioned impeller.

[0005] The impeller of the fan according to the embodiment of the utility model comprises: a first end plate, a second end plate and a plurality of blades, the first end plate being provided with an air inlet, the second end plate being spaced apart from and arranged relative to the first end plate; the plurality of blades being spaced apart and distributed along the circumference of the impeller, the blades having a blade trailing edge which faces away from the axis of the impeller, wherein the blade trailing edge comprises a first section, the first section extending obliquely in a direction away from the first end plate, and the inclination direction is opposite to the rotation direction of the impeller when working.

[0006] In the fan with an impeller according to the embodiment of the utility model, the first section of the trailing edge of the blade extends obliquely in a direction away from the first end plate, and the inclination direction is opposite to the rotation direction of the impeller when it is working, so that the blade is constructed with an inclined surface, which can reduce the airflow separation on the blade surface when the impeller is working, improve the aerodynamic efficiency of the impeller, and thereby improve the air volume and efficiency of the fan.

[0007] In addition, the impeller of the fan according to the above embodiment of the utility model may also have the following additional technical features:

[0008] In some embodiments, the first section extends in a direction away from the first end plate to an edge of an end of the blade close to the second end plate.

[0009] In some embodiments, an angle γ between the first segment and the axis is greater than or equal to 10° and less than 90°.

[0010] In some embodiments, the first segment is configured as a straight segment; or, the first segment is configured as an arc segment; or, in a direction away from the first end plate, the first segment is configured as an arc segment, and the inclination angle of the tangent of the first segment relative to the axis gradually increases.

[0011] In some embodiments, the blade trailing edge further includes a second segment, the second segment is closer to the first end plate than the first segment, and an angle α is formed between the first segment and the second segment.

[0012] In some embodiments, the second section extends obliquely in a direction away from the first end plate, and has the same inclination direction as the first section.

[0013] In some embodiments, the angle α between the first segment and the second segment satisfies 10°≤α≤60, preferably 40°≤α≤52°.

[0014] In some embodiments, the second segment is configured as a straight line segment; or, the second segment is configured as an arc segment; or, the second segment is configured as an arc segment, and the inclination angle of the tangent of the second segment relative to the axis gradually increases.

[0015] In some embodiments, the second section extends obliquely in a direction away from the first end plate and in a direction opposite to the inclination direction of the first section; or, the second section is coplanar with the axis.

[0016] In some embodiments, an angle β is formed between the second segment and the axis, wherein 0°≤β≤50°, preferably 0°≤β≤20°.

[0017] In some embodiments, there is a transition section between the first section and the second section, wherein the first section and the transition section are smoothly transitioned, and / or the second section and the transition section are smoothly transitioned; and / or the transition section is an arc section.

[0018] In some embodiments, the second section extends toward the first end plate to an edge of an end of the blade adjacent to the first end plate.

[0019] In some embodiments, in the axial direction, the height dimension of the blade is H1, and the height dimension of the second section is H3, wherein 10%≤H3 / H1≤75%, preferably, 40%≤H3 / H1≤70%.

[0020] In some embodiments, in the axial direction, the height dimension of the blade is H1, and the height dimension of the first section is H2, wherein 10%≤H2 / H1≤90%, preferably, 15%≤H2 / H1≤60%.

[0021] In some embodiments, the second end plate includes a first plate portion, the first plate portion extends in a radially outward direction of the impeller and in a direction away from the first end plate, and the blades are connected to the first plate portion.

[0022] In some embodiments, the second end plate further includes a second plate portion, and the first plate portion is connected to an outer periphery of the second plate portion and is disposed around the second plate portion.

[0023] The fan according to the embodiment of the utility model includes: a motor and the aforementioned impeller.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the impeller of some embodiments of the utility model (first perspective).

[0026] Figure 2 It is a schematic diagram of the impeller of some embodiments of the utility model (second viewing angle).

[0027] Figure 3 It is a schematic diagram of the impeller of some embodiments of the utility model (third perspective).

[0028] Figure 4 Schematic diagrams of impellers in other embodiments of the utility model.

[0029] Figure 5 It is a schematic diagram of the impeller of some embodiments of the utility model (fourth viewing angle).

[0030] Figure 6 It is a schematic cross-sectional view of an impeller according to an embodiment of the utility model.

[0031] Reference numerals:

[0032] Impeller 100, first end plate 10, air inlet 11, second end plate 20, first plate portion 21, second plate portion 22, blade 30, first end portion 30a, second end portion 30b, blade trailing edge 31, first section 311, second section 312, transition section 313, blade leading edge 32, impeller axis A. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Combination Figure 1 and Figure 2 The impeller 100 according to the embodiment of the utility model can be applied to a fan. The impeller 100 includes: a first end plate 10, a second end plate 20 and a plurality of blades 30. The first end plate 10 is provided with an air inlet 11, and the air inlet 11 can guide the airflow to enter the impeller 100. The second end plate 20 is spaced apart from and arranged relatively to the first end plate 10. The plurality of blades 30 are distributed along the circumference of the impeller 100. The blades 30 have blade trailing edges 31 that are away from the axis of the impeller 100. Specifically, in the radial direction of the impeller 100, the side of the same blade 30 close to the axis of the impeller 100 is the blade leading edge 32, and the side away from the axis of the impeller 100 is the blade trailing edge 31. In other words, the blade trailing edge 31 is closer to the outer edges of the first end plate 10 and the second end plate 20 than the blade leading edge 32. The first end plate 10 and the second end plate 20 provide support for the blades 30, thereby improving the rigidity and strength of the blades 30.

[0035] The blade trailing edge 31 may include a first section 311 , and the first section 311 extends obliquely in a direction away from the first end plate 10 , and the oblique direction is opposite to the rotation direction of the impeller 100 when working. Specifically, the impeller 100 of the embodiment of the utility model can be applied to a centrifugal fan. When the impeller 100 rotates, the airflow entering from the air inlet 11 is accelerated and the flow direction is changed, so that the flow direction of the gas entering from the air inlet 11 is changed from axial to radial. The flow path of the gas diverges radially and flows out from the gaps between adjacent blades 30. It can be understood that flow separation will occur in the process of gas flowing from the first end plate 10 to the second end plate 20, and the flow separation phenomenon will increase in the direction from the first end plate 10 to the second end plate 20. By setting the first section 311 of the trailing edge 31 of the blade to extend obliquely in the direction away from the first end plate 10, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, the blade 30 corresponding to the first section 311 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 30 corresponding to the first section 311, improve the aerodynamic efficiency of the impeller 100, and then improve the air volume and efficiency of the fan. Combined with Figure 1 As shown in , the impeller 100 can rotate in the direction of D1 → D2 during operation, and the first section 311 extends obliquely in the direction of D2 → D1.

[0036] According to the impeller 100 of the fan in the embodiment of the utility model, the first section 311 of the trailing edge 31 of the blade extends obliquely in the direction away from the first end plate 10, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, so that the blade 30 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 30 when the impeller 100 is working, improve the aerodynamic efficiency of the impeller 100, and further improve the air volume and efficiency of the fan.

[0037] Among them, the first section 311 can be the entire section of the blade trailing edge 31 in the extension direction from the first end plate 10 to the second end plate 20, that is, the blade trailing edge 31 as a whole extends obliquely in the direction away from the first end plate 10, and the first section 311 can also be one of the sections in the extension direction from the first end plate 10 to the second end plate 20. In other words, the blade trailing edge 31 can also include a second section, a third section, etc., wherein the first section 311 can be located at different positions of the blade trailing edge 31, for example, it can be located at a position of the blade trailing edge 31 close to the first end plate 10, it can also be located at a position of the blade trailing edge 31 close to the second end plate 20, or it can be located in the middle position of the blade trailing edge 31 in the axial direction. The impeller 100 guides the airflow into the impeller 100 from the air inlet 11 of the first end plate 10. During the flow of the airflow from the first end plate 10 to the second end plate 20, flow separation will occur. By setting the first section 311 of the blade trailing edge 31 to extend obliquely in the direction away from the first end plate 10, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, the airflow separation on the surface of the blade 30 can be reduced, the aerodynamic efficiency of the impeller 100 can be improved, and the air volume and efficiency of the fan can be improved.

[0038] In addition, a plurality of blades 30 are arranged at intervals along the circumference of the impeller 100, and at least a portion of the blades 30 may be connected between the first end plate 10 and the second end plate 20. In other words, all of the blades 30 may be connected between the first end plate 10 and the second end plate 20, or a portion of the blades 30 may be connected between the first end plate 10 and the second end plate 20. Specifically, the first end plate 10 and the second end plate 20 may be arranged at intervals along the air intake direction of the impeller 100, and a plurality of blades 30 are distributed at intervals along the circumference of the impeller 100, and the blades 30 are connected to the first end plate 10 and the second end plate 20. The air inlet 11 on the first end plate 10 may guide the gas to enter the impeller 100, and the second end plate 20 may provide support for the blades 30, thereby improving the rigidity and strength of the blades 30.

[0039] In some embodiments of the present invention, the first section 311 extends in a direction away from the first end plate 10 to an edge of an end of the blade 30 close to the second end plate 20. Figure 2, along the axial direction of the impeller 100, the blade 30 may have a first end 30a and a second end 30b opposite to each other, wherein the first end 30a is close to or connected to the first end plate 10, the second end 30b is close to or connected to the second end plate 20, and the first section 311 extends to the second end 30b of the blade 30 in a direction away from the first end plate 10. In combination with the above, after the airflow enters the impeller 100 from the air inlet 11, the flow separation phenomenon will increase in the direction from the first end plate 10 to the second end plate 20. By extending the first section 311 to the edge of one end of the blade 30, that is, the blade 30 has an inclined profile opposite to the rotation direction of the impeller 100, and extends obliquely to the second end 30b of the blade 30, the flow separation of the airflow on the surface of the blade 30 near the second end plate 20 can be effectively reduced, so that the airflow flows more smoothly, the aerodynamic efficiency of the impeller 100 is improved, and the air volume and working efficiency of the fan are improved.

[0040] It can be understood that by setting the first section 311 and extending it obliquely in the direction away from the first end plate 10, the blade 30 is constructed with an inclined surface, which can reduce the flow separation of the airflow in the flow direction from the first end plate 10 to the second end plate 20, wherein the first section 311 extends in the direction away from the first end plate 10, and the starting point of the first section 311 can be the first end 30a, of course, it can also be the starting point from the middle position of the blade trailing edge 31, and the present application does not limit the starting position of the first section 311.

[0041] Combination Figure 4 In some embodiments of the present invention, the angle γ between the first section 311 and the axis of the impeller 100 is greater than or equal to 10° and less than 90°. The axis of the impeller 100 is A, and there is a certain angle between the first section 311 and the impeller axis A, so that the blade 30 corresponding to the first section 311 has a properly inclined profile, which is convenient for guiding the flow of airflow, reducing the airflow separation on the surface of the blade 30, making the airflow flow smooth, and improving the aerodynamic efficiency of the blade 30.

[0042] Among them, the first segment 311 can be a straight line segment, an arc segment, etc. When the first segment 311 is a straight line segment, the angle γ between the first segment 311 and the axis can be a fixed angle. When the first segment 311 is an arc segment, the angle γ between the first segment 311 and the axis can be the angle between the tangent of the first segment 311 and the axis. That is to say, there are multiple angles γ between the first segment 311 and the axis, and the multiple angles γ all satisfy the requirement of being greater than or equal to 10° and less than 90°.

[0043] Furthermore, the angle γ between the first section 311 and the axis of the impeller 100 is greater than or equal to 40° and less than 72°, wherein the inclination angle of the first section 311 is controlled within a reasonable range, and the angle between the first section 311 and the axis of the impeller 100 is greater than or equal to 40°, which can effectively reduce the airflow separation on the surface of the blade 30, and the angle between the first section 311 and the axis of the impeller 100 is less than 72°, thereby avoiding excessive deflection of the blade 30 resulting in poor mold opening and manufacturability, thereby facilitating the processing and forming of the blade 30 and improving manufacturability and structural stability.

[0044] In some embodiments of the present invention, the first section 311 may be configured as a straight section, which can facilitate the processing and forming of the blade 30, improve the manufacturability of the blade 30, and reduce the mold cost.

[0045] In some embodiments of the present invention, the first section 311 is configured as an arc segment, and the corresponding blade 30 profile is also an arc surface, which can reduce the flow resistance of the airflow and improve the smoothness of the airflow.

[0046] In some embodiments of the present invention, the first section 311 is configured as an arc segment in a direction away from the first end plate 10, and the inclination angle of the tangent of the first section 311 relative to the axis gradually increases. In other words, in a direction gradually approaching the second end plate 20, the inclination angle of the first section 311 gradually increases, so as to further reduce the flow separation of the airflow in the process of flowing from the first end plate 10 to the second end plate 20, effectively reduce the flow separation at the position where the blade 30 is close to the second end plate 20, reduce the generation of vortices, make the airflow flow smoothly, and improve the aerodynamic efficiency of the blade 30.

[0047] Combination Figure 3 and Figure 4 In some embodiments of the utility model, the blade trailing edge 31 also includes a second section 312. The second section 312 is closer to the first end plate 10 than the first section 311, and there is an angle α between the first section 311 and the second section 312, which is convenient for mold opening and manufacturing of the blade 30. The surfaces of the blade 30 corresponding to the first section 311 and the second section 312 have different airflow separation phenomena. The first section 311 and the second section 312 are set at different inclination angles to improve the working efficiency of the impeller 100.

[0048] Among them, the second section 312 is close to the first end plate 10 and extends in the direction away from the first end plate 10. The second section 312 can be inclined in the same direction as the first section 311, or the second section 312 can be inclined in the opposite direction to the first section 311, or the second section 312 can be coplanar with the axis. In other words, the second section 312 can be a non-inclined structure.

[0049] Furthermore, the second section 312 extends obliquely in a direction away from the first end plate 10, and has the same inclination direction as the first section 311. That is, the second section 312 extends obliquely in a direction away from the first end plate 10, and the inclination direction is opposite to the rotation direction of the impeller 100 when working, so that the blade 30 corresponding to the second section 312 is constructed with an inclined surface, which can reduce the airflow separation on the surface of the blade 30 corresponding to the first section, improve the aerodynamic efficiency of the impeller 100, and thereby improve the air volume and efficiency of the fan.

[0050] Among them, the angle α between the second section 312 and the impeller axis A may be smaller than the angle γ between the first section 311 and the impeller axis A. In other words, the inclination angle of the second section 312 is smaller than the inclination angle of the first section 311. The inclination angle of the profile of the blade 30 corresponding to the first section 311 is larger, and the inclination angle of the profile of the blade 30 corresponding to the second section 312 is smaller. The cooperation between the first section 311 and the second section 312 can reduce the flow separation of the airflow near the second end plate 20, thereby improving the aerodynamic efficiency of the impeller 100.

[0051] In some embodiments of the utility model, the angle α between the first section 311 and the second section 312 satisfies 10°≤α≤60°, preferably, 40°≤α≤52°. The angle between the first section 311 and the second section 312 is set within a reasonable range to facilitate the processing and forming of the blade 30, and the cooperation between the first section 311 and the second section 312 can reduce the airflow separation on the surface of the blade 30 near the second end plate 20, thereby improving the aerodynamic efficiency of the impeller 100.

[0052] In some embodiments of the present invention, the second section 312 is configured as a straight section, which can facilitate the processing and forming of the blade 30, improve the manufacturability of the blade 30 and reduce the mold cost.

[0053] In some embodiments of the present invention, the second section 312 is configured as an arc segment, and the corresponding surface of the blade 30 is also an arc surface, which can reduce the resistance of the airflow and improve the smoothness of the airflow.

[0054] In some embodiments of the present invention, the second section 312 is configured as an arc segment, and the inclination angle of the tangent of the second section 312 relative to the axis gradually increases in the direction away from the first end plate 10. In other words, in the direction gradually approaching the second end plate 20, the inclination angle of the second section 312 gradually increases, so as to effectively reduce the flow separation of the airflow in the process of flowing from the first end plate 10 to the second end plate 20, reduce the generation of vortices, make the airflow flow smoothly, and improve the aerodynamic efficiency of the blade 30.

[0055] Combination Figure 4In some embodiments of the utility model, an angle β is provided between the second section 312 and the impeller axis A, wherein 0°≤β≤50°, preferably 0°≤β≤20°, wherein the inclination angle of the second section 312 is controlled within a reasonable range, which can reduce the airflow separation on the surface of the blade 30 corresponding to the first section 311, and avoid excessive deflection of the blade 30, poor mold opening and manufacturability, thereby facilitating the processing and forming of the blade 30 and improving the manufacturability and structural stability of the blade 30.

[0056] Combination Figure 3 and Figure 4 In some embodiments of the utility model, there is a transition section 313 between the first section 311 and the second section 312. By setting the transition section 313, and the first section 311 can smoothly transition to the transition section 313, or the second section 312 can smoothly transition to the transition section 313, or the first section 311 and the second section 312 can smoothly transition to the transition section 313, which can improve the flow smoothness of the airflow and improve the aerodynamic efficiency of the impeller 100.

[0057] Specifically, the first section 311 may be a straight section to facilitate mold manufacturing of the blade 30. By setting a transition section 313 between the first section 311 and the second section 312, and the first section 311 and the transition section 313 are in a smooth transition, the resistance of the airflow at the junction of the first section 311 and the second section 312 can be reduced, so that the airflow flows smoothly. The second section 312 may be a straight section to facilitate mold manufacturing of the blade 30. By setting a transition section 313 between the first section 311 and the second section 312, and the second section 312 and the transition section 313 are in a smooth transition, the resistance of the airflow at the junction of the first section 311 and the second section 312 can be reduced, so that the airflow flows smoothly.

[0058] In some embodiments of the present invention, the transition section 313 is an arc section. By setting the transition section 313 as an arc section, the airflow resistance on the surface of the blade 30 corresponding to the transition section 313 can be reduced, so that the airflow flows smoothly, thereby improving the aerodynamic efficiency of the blade 30.

[0059] Among them, the trailing edge 31 of the blade is provided with a first section 311, a transition section 313 and a second section 312 in sequence in the direction from the first end plate 10 to the second end plate 20, wherein the first section 311, the transition section 313 and the second section 312 can be arranged in different forms. For example, the first section 311 can be a straight section, the transition section 313 can be an arc section, and the second section 312 can be a straight section, which is convenient for mold manufacturing of the blade 30, reduces the mold manufacturing cost, and improves the manufacturability of the blade 30. Among them, the transition section 313 can be a tangent arc of the first section 311 and the second section 312. Through the cooperation of the first section 311, the transition section 313 and the second section 312, the blade 30 can construct an inclined curved surface structure, guide the airflow, reduce the airflow separation on the surface of the blade 30, and improve the working efficiency of the impeller 100. Of course, the first section 311 may be an arc section, the transition section 313 may be an arc section, and the second section 312 may be a straight section. For example, the first section 311, the second section 312, and the transition section 313 may all be arc sections. The first section 311, the arc section, and the second section 312 of the present application may also be configured in other forms, which are not listed one by one in the present application. Those skilled in the art can easily obtain other configuration forms in the present application based on the above description.

[0060] In some embodiments of the present invention, the second section 312 extends toward the first end plate 10 to an edge of the blade 30 close to one end of the first end plate 10. Figure 2 Along the axial direction of the impeller 100, the blade 30 may have a first end 30a and a second end 30b relative to each other, wherein the first end 30a is close to the first end plate 10, the second end 30b is close to the second end plate 20, and the second section 312 extends toward the first end plate 10 to the first end 30a of the blade 30.

[0061] Combination Figure 3 In some embodiments of the utility model, in the axial direction, the height dimension of the blade 30 is H1, and the height dimension of the first section 311 is H2, wherein 10%≤H2 / H1≤90%. Preferably, 15%≤H2 / H1≤60%, and the proportion of the first section 311 in the axial direction is within a reasonable range, which can enhance the improvement effect of the blade 30 corresponding to the first section 311 on the airflow separation, and facilitate the mold manufacturing of the blade 30. For example, H2 / H1 can be 16%, 20%, 30%, 40%, 60%, etc.

[0062] Combination Figure 4In some embodiments of the utility model, along the axial direction of the impeller 100, the height dimension of the blade 30 is H1, and the height dimension of the second section 312 is H3, wherein 10%≤H3 / H1≤75%, preferably, 40%≤H3 / H1≤70%. The inclination angle of the second section 312 relative to the first section 311 is small, and the proportion of the second section 312 in the axial direction is within a reasonable range, which can facilitate the mold manufacturing and processing of the blade 30, and facilitate the reduction of airflow separation on the surface of the blade 30 through the first section 311. For example, H2 / H1 can be 40%, 50%, 60%, 70%, etc.

[0063] Combination Figure 5 and Figure 6 In some embodiments of the utility model, the second end plate 20 includes a first plate portion 21, and the first plate portion 21 extends in a radially outward direction of the impeller 100 and in a direction away from the first end plate 10, and the blades 30 are connected to the first plate portion 21. Specifically, the airflow enters the impeller 100 from the air inlet 11 of the first end plate 10, and the first end plate 10 can guide the airflow into the impeller 100. The second end plate 20 can support the blades 30 and guide the airflow to leave the impeller 100. By setting the first plate portion 21 and constructing the first plate portion 21 with an outward-expanding shape, the resistance of the airflow during the outward flow can be reduced, so that the airflow can flow outward smoothly, thereby improving the working efficiency of the impeller 100.

[0064] Furthermore, the second end plate 20 also includes a second plate portion 22, the first plate portion 21 is connected to the outer periphery of the second plate portion 22, and the first plate portion 21 is arranged around the second plate portion 22, wherein the second plate portion 22 can be configured to connect to the motor, and the first plate portion 21 can be configured to connect to the blades 30. The cooperation between the first plate portion 21 and the second plate portion 22 can enhance the structural strength of the second end plate 20, thereby effectively supporting the blades 30 and enhancing the structural stability of the impeller 100.

[0065] The fan according to the embodiment of the utility model includes: a motor and the aforementioned impeller 100, wherein the fan can be a centrifugal fan, and by providing the aforementioned impeller 100, the airflow separation on the surface of the blade 30 is reduced, and the impeller 100 has high aerodynamic efficiency, thereby improving the air volume and working efficiency of the fan. The fan of the embodiment of the utility model can be applied to equipment such as air conditioners, and can reduce the energy consumption of the equipment.

[0066] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An impeller of a fan, characterized in that: include: A first end plate, wherein the first end plate is provided with an air inlet, a second end plate, the second end plate being spaced apart from and arranged opposite to the first end plate; a plurality of blades, the plurality of blades being spaced apart along the circumference of the impeller, the blades having a blade trailing edge facing away from the axis of the impeller, The trailing edge of the blade includes a first section, the first section extends obliquely in a direction away from the first end plate, and the inclination direction is opposite to the rotation direction of the impeller when it is working.

2. The impeller of the fan according to claim 1, characterized in that: The first section extends in a direction away from the first end plate to an edge of an end of the blade close to the second end plate.

3. The impeller of the fan according to claim 1, characterized in that: An included angle γ between the first section and the axis is greater than or equal to 10° and less than 90°.

4. The impeller of the fan according to claim 1, characterized in that: The first segment is configured as a straight segment; or, the first segment is configured as an arc segment; or, in a direction away from the first end plate, the first segment is configured as an arc segment, and an inclination angle of a tangent of the first segment relative to the axis gradually increases.

5. The impeller of a fan according to any one of claims 1 to 4, characterized in that: The blade trailing edge further includes a second section, the second section is closer to the first end plate than the first section, and an angle α is formed between the first section and the second section.

6. The impeller of the fan according to claim 5, characterized in that: The second section extends obliquely in a direction away from the first end plate, and has the same inclination direction as the first section.

7. The impeller of the fan according to claim 6, characterized in that: An included angle α between the first section and the second section satisfies 10°≤α≤60.

8. The impeller of the fan according to claim 7, characterized in that: 40°≤α≤52°。 9. The impeller of the fan according to claim 6, characterized in that: The second segment is configured as a straight line segment; or, the second segment is configured as an arc segment; or, the second segment is configured as an arc segment, and the inclination angle of the tangent of the second segment relative to the axis gradually increases.

10. The impeller of the fan according to claim 5, characterized in that: The second section extends obliquely in a direction away from the first end plate and in a direction opposite to the inclination direction of the first section; or, the second section is coplanar with the axis.

11. The impeller of the fan according to claim 5, characterized in that: An included angle β is formed between the second section and the axis, wherein 0°≤β≤50°.

12. The impeller of the fan according to claim 11, characterized in that: 0°≤β≤20°。 13. The impeller of the fan according to claim 5, characterized in that: There is a transition section between the first section and the second section, Wherein, the first section and the transition section are in smooth transition, and / or, the second section and the transition section are in smooth transition; and / or, the transition section is an arc section.

14. The impeller of the fan according to claim 5, characterized in that: The second section extends toward the first end plate to an edge of an end of the blade close to the first end plate.

15. The impeller of the fan according to claim 5, characterized in that: In the axial direction, the height dimension of the blade is H1, and the height dimension of the second section is H3, wherein 10%≤H3 / H1≤75%.

16. The impeller of the fan according to claim 15, characterized in that: 40%≤H3 / H1≤70%.

17. The impeller of the fan according to claim 1, characterized in that: In the axial direction, the height dimension of the blade is H1, and the height dimension of the first section is H2, wherein 10%≤H2 / H1≤90%.

18. The impeller of the fan according to claim 17, characterized in that: 15%≤H2 / H1≤60%.

19. The impeller of the fan according to claim 1, characterized in that: The second end plate comprises: A first plate portion, the first plate portion extending in a radially outward direction of the impeller and in a direction away from the first end plate, the blade being connected to the first plate portion; The second plate portion, wherein the first plate portion is connected to the outer periphery of the second plate portion and is arranged around the second plate portion.

20. A fan, characterized in that: include: A motor and an impeller according to any one of claims 1-19.

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