A motor fan impeller

Abstract

The present invention discloses a motor fan impeller, comprising a front cover plate and a rear cover plate which are sequentially arranged along the axial direction, a hub which is fixedly arranged between the front cover plate and the rear cover plate, and a plurality of blades which are sequentially fixedly arranged on the hub along the circumferential direction. An air inlet is arranged at the center of the front cover plate, and an air outlet channel is formed between adjacent blades, so that wind can enter axially through the air inlet and then flow out radially through the air outlet channel. In the airflow direction, the blades sequentially include an inlet structure and an outlet structure. The inlet structure is a planar symmetrical structure, and the plane of symmetry is the plane where the rotation centerline of the hub is located. In the outlet structure, at least part of the circumferential end surface is a deformation surface, and along the airflow direction, the deformation surface gradually deviates from the corresponding symmetry plane. Since the deformation surface is arranged on the outlet structure, compared with the straight blades in the prior art, the circumferential expansion trend of the airflow channel can be slowed down, and the flow efficiency of the fan can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor fan impeller. Background Art

[0002] Self-ventilated dual-rotation motors usually use a self-ventilating fan that rotates coaxially with the motor to drive the air flow in the base, so as to enhance the convection heat dissipation effect between the air in the base and the motor stator and rotor, and improve the overall cooling efficiency of the motor. Self-ventilating fans usually have the characteristics of axial air inlet and radial air outlet. They mainly rely on the work of fan blades and the action of centrifugal force to achieve the purpose of pressurizing the air and driving the air flow. Therefore, this type of fan is a type of centrifugal fan.

[0003] Unlike traditional centrifugal fans, the installation angle of the self-ventilating dual-rotation motor centrifugal fan blades is zero, which is to ensure that the fan has the same ventilation effect whether the motor rotates forward or reverse. Due to the zero installation angle, the fan blades' ability to increase the pressure of the airflow is significantly weaker than that of a unidirectional centrifugal fan. At the same time, the radial arrangement of the fan blades makes the fan flow channel end face shape have obvious Figure 1 As shown, the air inlet is narrow, the air outlet is wide, and the gas flow path gradually widens at a constant speed from the inlet to the outlet. As a result, the wall adhesion of the gas and the blades gradually deteriorates with the movement of the airflow. Generally, a relatively obvious airflow separation and outlet recirculation area will be formed near the outlet, causing the outlet to be blocked, affecting the flow efficiency of the fan.

[0004] Therefore, how to improve the flow efficiency of the fan is a technical problem that those skilled in the art currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a motor fan impeller having a high fan flow efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A motor fan impeller, comprising a front cover plate and a rear cover plate arranged in sequence along the axial direction, a hub fixedly arranged between the front cover plate and the rear cover plate, and a plurality of blades fixedly arranged in sequence along the circumferential direction on the hub; an air inlet is arranged at the center of the front cover plate, and an air outlet channel is formed between adjacent blades, so that wind can enter axially through the air inlet and then flow out radially through the air outlet channel;

[0008] In the airflow direction, the blade includes an inlet structure and an outlet structure in sequence;

[0009] The inlet structure is a plane symmetrical structure, and the symmetry plane is the plane where the rotation center line of the hub is located;

[0010] In the outlet structure, at least part of the circumferential end surface is a deformation surface, and along the airflow direction, the deformation surface gradually deviates from the corresponding symmetry plane, wherein the outlet structure corresponds to the symmetry plane of the inlet structure in the same blade.

[0011] Preferably, the two circumferential end surfaces of the outlet structure are respectively located on both sides of the corresponding symmetry plane.

[0012] Preferably, the two circumferential end surfaces of the outlet structure are plane-symmetrical with respect to the corresponding symmetry plane.

[0013] Preferably, all the blade structures are completely identical and are evenly arranged.

[0014] Preferably, the deformation surface is parallel to the axial direction.

[0015] Preferably, along the airflow direction, the spacing between two circumferentially adjacent inlet structures of the air outlet channel gradually increases, and the partial spacing between two circumferentially adjacent outlet structures gradually decreases.

[0016] Preferably, the outlet structure comprises two tail plates arranged in sequence along the circumferential direction, and the two tail plates are respectively arranged on both sides of the corresponding symmetry plane, and the deformation surface is arranged on the circumferential end surface of the tail plate away from the other tail plate; along the airflow direction, the two tail plates swing in the direction gradually away from the corresponding symmetry plane, so that the outlet structure forms a bifurcated structure.

[0017] Preferably, the outlet structure is a solid plate-like structure.

[0018] Preferably, in a direction perpendicular to the front cover plate and away from the front cover plate, the deformation surface gradually deviates from the corresponding symmetry plane.

[0019] Preferably, in a direction perpendicular to the front cover plate and away from the front cover plate, the outlet structure includes at least two split plates in sequence; each split plate swings along the airflow direction in a direction gradually away from the corresponding symmetry plane, and adjacent split plates in the outlet structure are respectively located on both sides of the corresponding symmetry plane; the deformation surface is arranged on the circumferential end surface of the split plate away from the corresponding symmetry plane.

[0020] The motor fan impeller provided by the present invention includes a front cover plate and a rear cover plate which are sequentially arranged along the axial direction, a hub is fixedly arranged between the front cover plate and the rear cover plate, and a plurality of blades are sequentially fixedly arranged on the hub along the circumferential direction. An air inlet is arranged at the center of the front cover plate, and an air outlet channel is formed between adjacent blades, so that wind can enter axially through the air inlet and then flow out radially through the air outlet channel. In the direction of airflow, the blades sequentially include an inlet structure and an outlet structure. The inlet structure is a plane-symmetrical structure, and the plane of symmetry is the plane where the rotation centerline of the hub is located. In the outlet structure, at least part of the circumferential end surface is a deformation surface, and along the airflow direction, the deformation surface gradually deviates from the corresponding plane of symmetry, wherein the outlet structure corresponds to the plane of symmetry of the inlet structure in the same blade.

[0021] The airflow enters from the air inlet, flows axially first, and then gradually changes to flow radially. When flowing through the blade, it first flows along the circumferential end surface of the inlet structure of the blade, and then flows along the circumferential end surface of the outlet structure of the blade. Among them, since the deformation surface is set on the outlet structure, compared with the straight blades in the prior art, each deformation surface can slow down the circumferential expansion trend of the airflow channel, and can reduce the wall shedding phenomenon and outlet backflow phenomenon of the airflow at the fan outlet to a certain extent, thereby improving the fan's work capacity and the convective heat dissipation efficiency in the motor base, and improving the fan's flow efficiency. In addition, since the inlet structure is a plane symmetrical structure, it can reduce the impact on the bidirectional rotation ability of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 Schematic diagram of the conventional fan backflow phenomenon in the prior art, X is the fan rotation direction, C is the forward airflow, and D is the reverse airflow;

[0024] Figure 2 Schematic diagram of the suppression of backflow by bifurcated blades in an impeller in a specific embodiment of the present invention, X is the rotation direction of the fan, and C is the forward airflow;

[0025] Figure 3 It is an axial view of the impeller in the first specific embodiment of the present invention, and the solid line with arrows indicates the airflow;

[0026] Figure 4 is a radial cross-sectional view of the impeller in the first specific embodiment of the present invention, O is the hub and the rotation centerline of the fan, and the arrow on the dotted line indicates a direction perpendicular to the front cover plate and away from the front cover plate;

[0027] Figure 5 It is a structural diagram of blades in an impeller in a specific embodiment 1 of the present invention;

[0028] Figure 6 It is a partial structural diagram of an impeller in a specific embodiment 1 of the present invention;

[0029] Figure 7 It is a partial structural diagram of the impeller in the second specific embodiment of the present invention;

[0030] Figure 8 This is an axial view of the impeller in the second specific embodiment of the present invention;

[0031] Fig. 9 It is a partial structural diagram of the impeller in the third specific embodiment of the present invention;

[0032] Fig.10 This is an axial view of the impeller in the third specific embodiment of the present invention;

[0033] Fig.11 It is a partial structural diagram of the impeller in the fourth specific embodiment of the present invention;

[0034] Fig.12 This is an axial view of the impeller in the fourth specific embodiment of the present invention;

[0035] Fig.13 It is a structural diagram of the blades of the impeller in the fifth specific embodiment of the present invention.

[0036] Reference numerals:

[0037] Symmetry plane S, airflow direction Q;

[0038] Entrance structure 1;

[0039] outlet structure 2, deformation surface 21, tail plate 22, split plate 23, circumferential end surface 24 of the outlet structure;

[0040] Blade 3, air outlet channel 31, air inlet edge 32, air outlet edge 33;

[0041] Front cover 4, air inlet 41;

[0042] Wheel hub 5;

[0043] Rear cover 6. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The core of the present invention is to provide a motor fan impeller, which has a high fan flow efficiency.

[0046] The specific embodiment 1 of the motor fan impeller provided by the present invention is used in the field of cooling power components of dual-rotation motors of electrical equipment, please refer to Figures 2 to 6 , including a front cover plate 4 and a rear cover plate 6 which are sequentially arranged along the axial direction. A hub 5 is fixedly arranged between the front cover plate 4 and the rear cover plate 6, and the rear cover plate 6 and the hub 5 are usually integrated. A plurality of blades 3 are sequentially fixedly arranged on the hub 5 along the circumferential direction, and the main function of the blades 3 is to do work on the airflow to increase the total pressure of the airflow. There is no gap between the front cover plate 4, the rear cover plate 6 and the blades 3, and the front cover plate 4 and the rear cover plate 6 mainly play the role of guiding and supporting the blades 3. An air inlet 41 is arranged at the center of the front cover plate 4, and an air outlet channel 31 is formed between adjacent blades 3, so that the wind can be as Figure 4 As shown, the air enters the air inlet 41 in the axial direction and then flows out in the radial direction through the air outlet channel 31 .

[0047] For each blade 3, the airflow direction Q refers to the direction of the airflow flowing along it. In the airflow direction Q, the blade 3 includes an inlet structure 1 and an outlet structure 2 in sequence.

[0048] The inlet structure 1 is a plane symmetrical structure, and the symmetry plane S is the plane where the rotation centerline of the hub 5 is located. Specifically, the inlet structure 1 is a straight plate structure, and its two circumferential end faces are planes parallel to the symmetry plane S, and can also be other shapes of non-uniform thickness.

[0049] In the outlet structure 2, at least part of the circumferential end surface is a deformation surface 21. Along the airflow direction Q, the deformation surface 21 gradually deviates from the symmetry plane S corresponding to the inlet structure 1 in the same blade 3. Among them, both ends of the outlet structure 2 in the circumferential direction are circumferential end surfaces, such as Figure 2 As shown, deformation surfaces 21 are provided on both circumferential end surfaces. Specifically, along the airflow direction Q, the outlet structure 2 extends from the middle of the blade 3 to the tail end of the blade 3 , and the starting position of the outlet structure 2 can be set according to actual needs, and the tail end is the tail end of the blade 3 .

[0050] In the present application, the outlet structure 2, the inlet structure 1 and the symmetry plane S of the inlet structure 1 on the same blade 3 have a corresponding relationship.

[0051] In this embodiment, Figure 4As shown, the airflow enters from the air inlet 41, flows axially first, and then gradually changes to flow radially. When flowing through the blade 3, it first flows along the circumferential end surface of the inlet structure 1 of the blade 3, and then flows along the circumferential end surface 24 of the outlet structure 2 of the blade 3. In particular, since the deformed surface 21 is provided on the outlet structure 2, compared with the straight blade 3 in the prior art, each deformed surface 21 can slow down the circumferential expansion trend of the airflow channel, as shown in FIG. Figure 2 The deformation surface A in the fan can slow down the expansion trend on the right side of the airflow channel on the left side, and can reduce the wall shedding phenomenon and outlet backflow phenomenon of the airflow at the fan outlet to a certain extent, thereby improving the fan's work capacity and the convective heat dissipation efficiency in the motor base. In addition, since the inlet structure 1 is a plane symmetrical structure, the influence on the bidirectional rotation ability of the impeller can be reduced.

[0052] Furthermore, the two circumferential end faces 24 of the outlet structure 2 are located on both sides of the corresponding symmetry plane S, which can improve the consistency of the structures of the two circumferential end faces 24 of the outlet structure 2 and enhance the bidirectional rotation capability of the impeller. Figure 5 As shown, the two circumferential end faces 24 of the outlet structure 2 are plane-symmetrical relative to the symmetry plane S, so as to further ensure that the working capacity of the impeller is completely the same when rotating forward and reversely.

[0053] Furthermore, if Figure 3 and Figure 5 As shown, the deformation surface 21 is parallel to the axial direction, and more specifically, is arranged on a plane parallel to the axial direction for easy processing.

[0054] Furthermore, if Figure 3 As shown, along the airflow direction Q, the spacing between two circumferentially adjacent inlet structures 1 of the air outlet channel 31 gradually increases, and the partial spacing between two circumferentially adjacent outlet structures 2 gradually decreases, so that along the airflow direction Q, the circumferential width of the air outlet channel 31 gradually expands and then gradually shrinks, which can further avoid the occurrence of backflow. Of course, in other embodiments, in the airflow direction Q, the partial spacing between two circumferentially adjacent outlet structures 2 can also gradually increase, but the speed of increase is less than the speed of increase of the spacing between two circumferentially adjacent inlet structures 1 of the air outlet channel 31.

[0055] Furthermore, if Figure 3 As shown, all blades 3 have exactly the same structure and are evenly arranged, which can ensure the working capacity of the impeller and facilitate processing.

[0056] Furthermore, if Figure 3 and Figure 6As shown, the outlet structure 2 includes two tail plates 22 arranged in sequence along the circumferential direction, and the two tail plates 22 are respectively arranged on both sides of the corresponding symmetry plane S. Specifically, the tail plate 22 can be a straight plate of equal thickness, or a plate of unequal thickness or a non-straight plate structure. For each tail plate 22, its deformation surface 21 is arranged on the circumferential end surface of the tail plate 22 away from another tail plate 22 in the same outlet structure 2, that is, in the outlet structure 2, the circumferential end surface of each tail plate 22 away from another tail plate 22 is the circumferential end surface 24 of the outlet structure 2. Preferably, the entire circumferential end surface of the outlet structure 2 is the deformation surface 21. Along the airflow direction Q, the two tail plates 22 swing in the direction gradually away from the corresponding symmetry plane S, so that the outlet structure 2 forms a bifurcated structure. Due to the setting of the bifurcated structure, the weight of the blade 3 can be reduced while the outlet structure 2 has the deformation surface 21.

[0057] In addition, if Figure 2 As shown, in the outlet structure 2, the bifurcation angle between the two tail plates 22 ranges from 0° to 180°. Figure 4 As shown, on the blade 3, the air inlet edge 32 and the air outlet edge 33 are straight lines or non-straight lines. In the airflow direction Q, the air inlet edge 32 is specifically the starting edge of the inlet structure 1, and the air outlet edge 33 is the tail edge of the outlet structure 2. The angle β between the air inlet edge 32 and the rotation centerline O of the impeller is in the range of 0°-180°, and the angle between the air outlet edge 33 and the rotation centerline O is in the range of 0°-90°.

[0058] The dual-rotation motor self-ventilating centrifugal fan impeller with circumferentially forked blades provided in the present embodiment can, based on the setting of the outlet structure 2, solve the problems of severe outlet backflow, large secondary flow loss and poor flow effect of the traditional dual-rotation motor self-ventilating fan. At the same time, through the setting of the symmetrical structure of the blades 3, it can meet the forward and reverse rotation requirements. To ensure the same cooling and heat dissipation effects in the forward and reverse rotation conditions, and on the premise that the forward and reverse rotations have the same functional capacity for the airflow, compared with the existing self-ventilating fans, the flow rate and efficiency are higher, and the aerodynamic performance is better.

[0059] Of course, the outlet structure 2 is not limited to being set as the bifurcated structure in the embodiment 1. For example, in the specific embodiment 2, please refer to Figure 7 and Figure 8 The outlet structure 2 is a solid plate structure, which is easy to process.

[0060] In addition, the deformation surface 21 is not limited to being arranged parallel to the axial direction, and the entire circumferential end surface may not be arranged as the deformation surface 21. Figures 9 and 10 , in a direction perpendicular to the front cover plate 4 and away from the front cover plate 4 , the deformation surface 21 gradually deviates from the corresponding symmetry plane S.

[0061] Among them, when the front cover plate 4 is a straight structure, the direction perpendicular to the front cover plate 4 is consistent at all points in the airflow direction Q, and when the front cover plate 4 has a curved surface, at different positions of the front cover plate 4, the direction perpendicular to the front cover plate 4 is specifically the direction perpendicular to the cross-section of each point of the front cover plate 4.

[0062] That is to say, in this embodiment, the deformation surface 21 of the outlet structure 2, a portion of the surface of the circumferential end surface of the outlet structure 2 is the deformation surface 21. Fig. 9 As shown, there is a gradual trend in both the airflow direction Q and the direction perpendicular to the front cover plate 4 , which can partially improve the backflow problem of the air outlet channel 31 .

[0063] In addition, different from the first embodiment, the two circumferential end faces of the outlet structure 2 may not be plane symmetrical with respect to the symmetry plane S. In the fourth embodiment, Fig.11 and Fig.12 As shown, in a direction perpendicular to the front cover plate 4 and away from the front cover plate 4, the outlet structure 2 includes at least two split plates 23 in sequence. Each split plate 23 swings along the airflow direction Q in a direction gradually away from the corresponding symmetry plane S, and adjacent split plates 23 in the outlet structure 2 are respectively located on both sides of the corresponding symmetry plane S. Among them, the deformation surface 21 is provided on the circumferential end surface of the split plate 23 away from the symmetry plane S. Specifically, in this embodiment, two split plates 23 are provided, and in other embodiments, three or other numbers of split plates 23 may also be provided. In this embodiment, each split plate 23 can play an effect of reducing the backflow phenomenon in one of the rotation directions of the impeller.

[0064] In addition, different from the first embodiment, the deformation surface 21 may be provided on only one of the two circumferential end surfaces 24 of the outlet structure 2. Fig.13 In the fifth specific embodiment shown, for the blade 3 , the circumferential end surface on the left side of the outlet structure 2 is a deformation surface 21 , while the circumferential end surface on the right side is a surface parallel to the corresponding symmetry plane S, has no gradual change trend, and is not a deformation surface 21 .

[0065] It should be noted that when an element is referred to as "fixing" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0067] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] The above is a detailed introduction to the dual-rotation motor centrifugal fan impeller provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A motor fan impeller, characterized in that: The motor fan impeller is a dual-rotation motor self-ventilating centrifugal fan impeller, comprising a front cover plate (4) and a rear cover plate (6) arranged in sequence along the axial direction, a hub (5) being fixedly arranged between the front cover plate (4) and the rear cover plate (6), and a plurality of blades (3) being fixedly arranged in sequence along the circumferential direction on the hub (5); an air inlet (41) is arranged at the center of the front cover plate (4), and an air outlet channel (31) is formed between adjacent blades (3), so that wind can enter in the axial direction through the air inlet (41) and then flow out in the radial direction through the air outlet channel (31); In the airflow direction, the blade (3) comprises an inlet structure (1) and an outlet structure (2) in sequence; The inlet structure (1) is a plane-symmetrical structure, and the symmetry plane (S) is the plane where the rotation center line of the hub (5) is located; The outlet structure (2) corresponds to the symmetry plane (S) of the inlet structure (1) in the same blade (3); in the outlet structure (2), at least a portion of the circumferential end surface (24) is a deformation surface (21); and along the airflow direction, the deformation surface (21) gradually deviates from the corresponding symmetry plane (S); The outlet structure (2) comprises two tail plates (22) arranged in sequence along the circumferential direction, and the two tail plates (22) are respectively arranged on both sides of the corresponding symmetry plane (S), and the deformation surface (21) is arranged on the circumferential end surface of the tail plate (22) away from the other tail plate (22); along the airflow direction, the two tail plates (22) respectively swing in a direction gradually away from the corresponding symmetry plane (S), so that the outlet structure (2) forms a bifurcated structure; In a direction perpendicular to the front cover plate (4) and away from the front cover plate (4), the deformation surface (21) gradually deviates from the corresponding symmetry plane (S); The two circumferential end surfaces (24) of the outlet structure (2) are plane-symmetrical with respect to the corresponding symmetry plane (S); Along the airflow direction, the spacing between two circumferentially adjacent inlet structures (1) of the air outlet channel (31) gradually increases, and the partial spacing between two circumferentially adjacent outlet structures (2) gradually decreases.

2. The motor fan impeller according to claim 1, characterized in that: All the blades (3) have exactly the same structure and are evenly arranged.

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