WO2023045004A1

WO2023045004A1 - Motor fan impeller

Info

Publication number: WO2023045004A1
Application number: PCT/CN2021/125172
Authority: WO
Inventors: 崔可; 王韬; 郑国丽; 周茜茜; 何维林
Original assignee: 中车株洲电机有限公司
Priority date: 2021-09-26
Filing date: 2021-10-21
Publication date: 2023-03-30
Also published as: CN113685371A

Abstract

A motor fan impeller, comprising a front cover plate (4) and a rear cover plate (6) arranged in sequence along an axial direction, wherein a hub (5) is fixedly arranged between the front cover plate (4) and the rear cover plate (6), and a plurality of blades (3) are fixedly arranged on the hub (5) in sequence along a circumferential direction. 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 may enter along the axial direction via the air inlet (41), and then flow out radially by means of the air outlet channel (31). In an airflow direction, each blade (3) sequentially comprises an inlet structure (1) and an outlet structure (2). The inlet structure (1) is a plane symmetrical structure, and a symmetrical plane (S) is a plane where the rotational center line of the hub (5) is located. In the outlet structure (2), at least part of a circumferential end surface is a deforming surface (21), and along the airflow direction (Q), the deforming surface (21) gradually deviates from the corresponding symmetrical plane (S). Since the deforming surface (21) is provided on the outlet structure (2), compared to straight blades in the prior art, the circumferential expansion trend of an airflow channel may be mitigated, and the flow efficiency of the fan may be increased.

Description

A motor fan impeller

This application claims the priority of the Chinese patent application with the application number 202111128299.5 and the title of the invention "A Motor Fan Impeller" submitted to the China Patent Office on September 26, 2021, the entire contents of which are incorporated in this application by reference.

technical field

The invention relates to the technical field of motors, in particular to a motor fan impeller.

Background technique

Self-ventilated double-rotating motors usually use a self-ventilating fan that rotates coaxially with the motor to drive the air flow in the frame to enhance the convective heat dissipation effect between the air in the frame and the stator and rotor of the motor, and improve the overall cooling efficiency of the motor. Self-ventilating fans usually have the airflow characteristics of axial air inlet and radial air outlet, mainly relying on the work of fan blades and centrifugal force to achieve the purpose of boosting air and driving air flow, so this kind of fan is a centrifugal fan. A type of fan.

Different from the traditional centrifugal fan, the installation angle of the self-ventilating double-rotation motor centrifugal fan blade is zero, which is to ensure that the ventilation effect of the fan is exactly the same as the motor rotates forward and reverse. Due to the installation angle of zero, the fan blades have a significantly weaker pressurization capacity than a one-way rotating centrifugal fan. At the same time, the radial arrangement of the fan blades makes the shape of the end surface of the fan flow channel have the obvious characteristics of narrow air inlet and wide air outlet as shown in Figure 1, and the gas flow channel gradually widens from the inlet to the outlet at a constant speed , This also causes the wall adhesion between the gas and the blades to gradually deteriorate with the airflow movement, and a relatively obvious airflow separation and outlet recirculation area will generally be formed near the outlet, causing the outlet to be blocked and affecting the fan's flow efficiency.

Therefore, how to improve the ventilation efficiency of the fan is a technical problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide a motor fan impeller with high fan flow efficiency.

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

A motor fan impeller, comprising a front cover plate and a rear cover plate arranged in sequence along the axial direction, a hub is fixedly arranged between the front cover plate and the rear cover plate, and a plurality of Blades; the center of the front cover is provided with an air inlet, and an air outlet channel is formed between adjacent blades, so that the wind can enter in the axial direction 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 plane symmetric structure, and the symmetry plane is the plane where the rotation center line of the hub is located;

In the outlet structure, at least part of the circumferential end surface is a deformed surface, and along the airflow direction, the deformed surface gradually deviates from the corresponding plane of symmetry, wherein the outlet structure is the same as that of the inlet structure in the same blade. The plane of symmetry corresponds.

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

Preferably, the two circumferential end faces of the outlet structure are plane-symmetric with respect to the corresponding plane of symmetry.

Preferably, all the blade structures are identical and arranged evenly.

Preferably, the deformation surface is parallel to the axial direction.

Preferably, along the airflow direction, the distance between the two adjacent inlet structures in the circumferential direction of the air outlet channel gradually increases, and the partial distance between the two adjacent outlet structures in the circumferential direction gradually decreases. .

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

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

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

Preferably, in a direction perpendicular to the front cover plate and away from the front cover plate, the outlet structure includes at least two sub-plates in turn; each of the sub-plates gradually moves away from the corresponding plane of symmetry along the airflow direction swing in the same direction, and the adjacent sub-plates in the outlet structure are respectively located on both sides of the corresponding symmetry plane; the deformation surface is provided on the circumferential end surface of the sub-plate away from the corresponding symmetry plane superior.

The motor fan impeller provided by the present invention includes a front cover and a rear cover arranged in sequence in the axial direction, a hub is fixedly arranged between the front cover and the rear cover, and a plurality of blades are fixed in turn on the hub along the circumferential direction. An air inlet is arranged in the center of the front cover, and an air outlet channel is formed between adjacent blades, so that the wind can enter in the axial direction through the air inlet, and then flow out in the radial direction through the air outlet channel. In the direction of the airflow, the blade comprises in turn an inlet structure and an outlet structure. The inlet structure is a plane symmetrical structure, and the symmetrical plane 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 deformed surface, and along the airflow direction, the deformed 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.

The air flow enters from the air inlet, first flows axially, and gradually changes to radial flow. When passing through the blade, it first flows against the circumferential end surface of the inlet structure of the blade, and then flows close to the circumferential end surface of the outlet structure of the blade. , wherein, since the outlet structure is provided with deformed surfaces, compared with the prior art straight blades, each deformed surface can slow down the circumferential expansion trend of the airflow channel, and can weaken the wall shedding of the airflow at the fan outlet to a certain extent Phenomenon and outlet backflow phenomenon, thereby improving the working ability of the fan and the convection heat dissipation efficiency in the motor frame, and improving the fan flow efficiency. In addition, since the inlet structure is a plane symmetrical structure, the impact on the bidirectional rotation capability of the impeller can be reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic diagram of the traditional fan backflow phenomenon in the prior art, X is the rotation direction of the fan, C is the forward airflow, and D is the reverse airflow;

Fig. 2 is a schematic diagram of the suppression of the backflow phenomenon by the bifurcated blades in the impeller in Embodiment 1 of the present invention, X is the rotation direction of the fan, and C is the forward airflow;

Fig. 3 is an axial view of the impeller in Embodiment 1 of the present invention, and the solid line with arrows indicates the air flow;

4 is a radial cross-sectional view of the impeller in Embodiment 1 of the present invention, O is the rotation centerline of the hub and the fan, and the arrow on the dotted line indicates the direction perpendicular to the front cover and away from the front cover;

Fig. 5 is a structural diagram of blades in the impeller in Embodiment 1 of the present invention;

Fig. 6 is a partial structural diagram of the impeller in Embodiment 1 of the present invention;

Fig. 7 is a partial structural diagram of the impeller in the second embodiment of the present invention;

Fig. 8 is an axial view of the impeller in the second embodiment of the present invention;

Fig. 9 is a partial structural view of the impeller in Embodiment 3 of the present invention;

Fig. 10 is an axial view of the impeller in Embodiment 3 of the present invention;

Fig. 11 is a partial structural diagram of the impeller in Embodiment 4 of the present invention;

Fig. 12 is an axial view of the impeller in Embodiment 4 of the present invention;

Fig. 13 is a structural diagram of the blades of the impeller in Embodiment 5 of the present invention.

Reference signs:

Symmetry plane S, airflow direction Q;

Ingress struct 1;

Outlet structure 2, deformation surface 21, tail plate 22, sub-plate 23, circumferential end surface 24 of the outlet structure;

Blade 3, air outlet channel 31, air inlet side 32, air outlet side 33;

Front cover 4, air inlet 41;

hub 5;

rear cover 6.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The core of the present invention is to provide a motor fan impeller with high fan flow efficiency.

The first specific embodiment of the motor fan impeller provided by the present invention is used in the field of cooling power components of bidirectional motors in electrical equipment, please refer to Figures 2 to 6, including a front cover 4 and a rear cover 6 arranged in sequence along the axial direction . A wheel 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 wheel hub 5 are generally integrated. A plurality of blades 3 are fixedly arranged in turn on the hub 5 along the circumferential direction, and the main function of the blades 3 is to perform work on the airflow to increase the total pressure of the airflow. There is no gap between the front cover plate 4 and the rear cover plate 6 and the blades 3, the front cover plate 4 and the rear cover plate 6 mainly play the role of guiding the flow and supporting the blades 3, and the center of the front cover plate 4 is provided with an air inlet 41 , and an air outlet channel 31 is formed between adjacent blades 3, so that the wind can enter in the axial direction through the air inlet 41 as shown in FIG.

For each vane 3 , the airflow direction Q refers to the direction of the airflow following its flow. In the airflow direction Q, 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 symmetrical plane S is the plane where the rotation center line of the hub 5 is located. Specifically, the inlet structure 1 is a straight plate structure, and its two circumferential end surfaces are planes parallel to the symmetry plane S, and may also be other shapes with unequal thickness.

In the outlet structure 2 , at least part of the circumferential end surface is a deformed surface 21 , and along the airflow direction Q, the deformed surface 21 gradually deviates from the symmetry plane S corresponding to the inlet structure 1 in the same blade 3 . Wherein, both ends of the outlet structure 2 in the circumferential direction are circumferential end faces. As shown in FIG. 2 , deformation surfaces 21 are provided on both circumferential end faces. 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 , 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 .

Wherein, 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.

In this embodiment, as shown in FIG. 4, the air flow enters from the air inlet 41, first flows in the axial direction, and gradually changes to flow in the radial direction. When passing through the blade 3, it first adheres to the circumferential direction of the inlet structure 1 of the blade 3. The end surface flows, and then flows against the circumferential end surface 24 of the outlet structure 2 of the blade 3, wherein, since the outlet structure 2 is provided with a deformed surface 21, compared with the straight blade 3 of the prior art, each deformed surface 21 can slow down The circumferential expansion trend of the airflow channel, as shown in the deformation surface A in Figure 2, can slow down its expansion trend on the right side of the left airflow channel, and can weaken the wall shedding phenomenon and outlet backflow of the airflow at the fan outlet to a certain extent phenomenon, thereby improving the working ability of the fan and the convection heat dissipation efficiency in the motor frame. In addition, since the inlet structure 1 is a plane symmetrical structure, it can reduce the influence on the two-way rotation ability of the impeller.

Further, the two circumferential end surfaces 24 of the outlet structure 2 are located on both sides of the corresponding symmetry plane S, which can improve the structural consistency of the two circumferential end surfaces 24 of the outlet structure 2 and improve the bidirectional rotation capability of the impeller. More preferably, as shown in FIG. 5 , the two circumferential end surfaces 24 of the outlet structure 2 are planarly symmetrical with respect to the symmetry plane S, so as to further ensure that the working performance of the impeller is exactly the same when it is forward and reverse.

Further, as shown in FIG. 3 and FIG. 5 , the deformation surface 21 is parallel to the axial direction, more specifically, it is arranged on a plane parallel to the axial direction, which is convenient for processing.

Further, as shown in FIG. 3 , along the airflow direction Q, the spacing between the two circumferentially adjacent inlet structures 1 of the air outlet channel 31 gradually increases, and the partial spacing between the circumferentially adjacent two outlet structures 2 Gradual reduction, so that along the airflow direction Q, the circumferential width of the air outlet channel 31 gradually expands and then tapers, which can further avoid the phenomenon of backflow. Of course, in other embodiments, in the airflow direction Q, the partial spacing between two adjacent outlet structures 2 in the circumferential direction can also be gradually increased, but the increase speed is slower than that between two adjacent outlet structures 2 of the air outlet channel 31 in the circumferential direction. The speed at which the spacing between the inlet structures 1 increases.

Further, as shown in FIG. 3 , all blades 3 have identical structures and are evenly arranged, which can ensure the working capacity of the impeller and facilitate processing.

Further, as shown in FIG. 3 and FIG. 6 , the outlet structure 2 includes two tail plates 22 sequentially arranged along the circumferential direction, and the two tail plates 22 are respectively arranged on both sides of the corresponding plane S of symmetry. Specifically, the tail plate 22 may be a straight plate of equal thickness, or may adopt 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 the other tail plate 22 in the same outlet structure 2, that is to say, in the outlet structure 2, each tail plate 22 is far away from the other tail plate 22. The circumferential end surface of a 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 tailgates 22 swing in directions 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 outlet structure 2 can have a deformed surface. 21 simultaneously, reduce blade 3 weights.

In addition, as shown in FIG. 2 , in the outlet structure 2 , the bifurcation angle between the two tail plates 22 ranges from 0° to 180°. In addition, as shown in FIG. 4 , on the blade 3 , the inlet side 32 and the outlet side 33 are straight or non-linear. In the airflow direction Q, the inlet side 32 is specifically the starting side of the inlet structure 1 , and the outlet side 33 is the trailing side of the outlet structure 2 . The angle β between the air inlet side 32 and the rotation center line O of the impeller ranges from 0° to 180°, and the angle between the air outlet side 33 and the rotation center line O ranges from 0° to 90°.

The impeller of the self-ventilating centrifugal fan of the double-rotating motor with circumferentially bifurcated blades provided in this embodiment, based on the setting of the outlet structure 2, can solve the problem of serious backflow at the outlet of the self-ventilating fan of the traditional double-rotating motor and relatively high secondary flow loss. At the same time, through the setting of the symmetrical structure of the blade 3, it can meet the requirements of forward and reverse rotation. In order to ensure the same cooling and heat dissipation effect under the condition of forward and reverse rotation, the work ability of forward and reverse airflow is consistent Compared with the existing self-ventilating fan, the flow rate and efficiency are higher, and the aerodynamic performance is better.

Of course, the outlet structure 2 is not limited to be the bifurcated structure in the first embodiment. As in the second embodiment, please refer to FIG. 7 and FIG. 8 , the outlet structure 2 is a solid plate structure, which is convenient for processing.

In addition, the deformed surface 21 is not limited to be arranged parallel to the axial direction, and the entire circumferential end surface may not be provided as the deformed surface 21 . As in the third embodiment, referring to FIG. 9 to FIG. 10 , in the direction perpendicular to the front cover 4 and away from the front cover 4 , the deformation surface 21 gradually deviates from the corresponding symmetry plane S.

Wherein, when the front cover plate 4 is a straight structure, the direction perpendicular to the front cover plate 4 is consistent everywhere on the airflow direction Q; In different positions, the direction perpendicular to the front cover 4 is specifically the direction perpendicular to the tangent plane of each point of the front cover 4 .

That is to say, in this embodiment, the deformed surface 21 of the outlet structure 2, a part of the surface of the circumferential end surface of the outlet structure 2 is the deformed surface 21, which is shown in FIG. These two directions both have a gradual change trend, which can partially improve the backflow problem of the air outlet channel 31 .

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, as shown in FIG. 11 and FIG. 12 , in a direction perpendicular to the front cover 4 and away from the front cover 4 , the outlet structure 2 sequentially includes at least two sub-boards 23 . Each sub-plate 23 swings along the airflow direction Q toward a direction gradually away from the corresponding symmetry plane S, and adjacent sub-plates 23 in the outlet structure 2 are located on both sides of the corresponding symmetry plane S, respectively. Wherein, the deformation surface 21 is provided on the circumferential end surface of the sub-plate 23 away from the symmetry plane S. As shown in FIG. Specifically, in this embodiment, two sub-boards 23 are provided, and in other embodiments, three sub-boards 23 may also be provided or other numbers. In this embodiment, each sub-plate 23 can reduce the backflow phenomenon in one of the rotation directions of the impeller.

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 . As shown in Figure 13 in the fifth embodiment, for the blade 3, the left circumferential end surface of the outlet structure 2 is a deformation surface 21, and the right circumferential end surface is a surface parallel to the corresponding symmetry plane S, not It has a gradual tendency and is not a deformed surface 21.

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 be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but 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 construed as limiting the present invention .

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The centrifugal fan impeller provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A motor fan impeller, characterized in that it includes a front cover (4) and a rear cover (6) arranged in sequence along the axial direction, and a gap between the front cover (4) and the rear cover (6) The wheel hub (5) is fixedly arranged, and a plurality of blades (3) are fixedly arranged in turn on the wheel hub (5) along the circumferential direction; the center of the front cover (4) is provided with an air inlet (41), adjacent to the blades ( 3) form an air outlet channel (31) between them, so that the wind can enter axially through the air inlet (41), and then flow out radially through the air outlet channel (31);

In the airflow direction, the blade (3) sequentially includes an inlet structure (1) and an outlet structure (2);

The inlet structure (1) is a plane symmetric structure, and the symmetry plane (S) is the plane where the rotation centerline of the hub (5) is located;

In the outlet structure (2), at least part of the circumferential end surface (24) is a deformed surface (21), and along the airflow direction, the deformed surface (21) gradually deviates from the corresponding plane of symmetry (S), wherein, Said outlet structure (2) corresponds to said plane of symmetry (S) of said inlet structure (1) in the same said blade (3).
The motor fan impeller according to claim 1, characterized in that, the two circumferential end surfaces (24) of the outlet structure (2) are respectively located on two sides of the corresponding plane of symmetry (S).
The motor fan impeller according to claim 2, characterized in that, the two circumferential end surfaces (24) of the outlet structure (2) are plane-symmetric with respect to the corresponding plane of symmetry (S).
The motor fan impeller according to claim 1, characterized in that, all the blades (3) have the same structure and are uniformly arranged.
The motor fan impeller according to claim 1, characterized in that the deformation surface (21) is parallel to the axial direction.
The motor fan impeller according to claim 1, characterized in that, along the airflow direction, the distance between the two adjacent inlet structures (1) in the circumferential direction of the air outlet channel (31) gradually increases, and Partial spacing between two circumferentially adjacent outlet structures (2) decreases gradually.
The motor fan impeller according to any one of claims 1 to 6, characterized in that, the outlet structure (2) includes two tail plates (22) sequentially arranged along the circumferential direction, and the two The tail plate (22) is respectively arranged on both sides of the corresponding said symmetry plane (S), and the said deformation surface (21) is arranged on the circumferential direction of the said tail plate (22) away from the other said tail plate (22). On the end surface: along the direction of airflow, the two tail plates (22) respectively swing towards the direction gradually away from the corresponding plane of symmetry (S), so that the outlet structure (2) forms a bifurcated structure.
The motor fan impeller according to any one of claims 1 to 6, characterized in that the outlet structure (2) is a solid plate-like structure.
The motor fan impeller according to any one of claims 1 to 4, characterized in that, in a direction perpendicular to the front cover (4) and away from the front cover (4), the deformation surface ( 21) Gradually deviate from the corresponding said plane of symmetry (S).
The motor fan impeller according to any one of claims 1 to 5, characterized in that, in a direction perpendicular to the front cover (4) and away from the front cover (4), the outlet structure ( 2) including at least two sub-boards (23) in sequence; each of the sub-boards (23) swings along the airflow direction toward a direction gradually away from the corresponding plane of symmetry (S), and the adjacent outlet structures (2) The sub-plates (23) are respectively located on both sides of the corresponding symmetry plane (S); circumferential end face.