CN113685371A

CN113685371A - Motor fan impeller

Info

Publication number: CN113685371A
Application number: CN202111128299.5A
Authority: CN
Inventors: 崔可; 王韬; 郑国丽; 周茜茜; 何维林
Original assignee: CRRC Zhuzhou Electric Co Ltd
Current assignee: CRRC Zhuzhou Electric Co Ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-11-23
Also published as: WO2023045004A1

Abstract

The invention discloses 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 are fixedly arranged on the hub in sequence along the circumferential direction. The center of the front cover plate is provided with an air inlet, and an air outlet channel is formed between the adjacent blades, so that the wind can enter through the air inlet in the axial direction, and then flow out in the radial direction through the air outlet channel. In the direction of airflow, the vanes sequentially include an inlet structure and an outlet structure. 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. In the outlet structure, at least part of the circumferential end surfaces are deformed surfaces, and along the airflow direction, the deformed surfaces gradually deviate from the corresponding symmetry plane. Since the deformed 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 ventilation efficiency of the fan can be improved.

Description

Motor fan impeller

Technical Field

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

Background

The self-ventilation type double-rotation-direction motor generally adopts a self-ventilation fan which rotates coaxially with the motor to drive air in the motor base to flow so as to enhance the convection heat dissipation effect between the air in the motor base and the stator and the rotor of the motor and improve the overall cooling efficiency of the motor. The self-ventilation fan usually has the characteristics of axial air inlet and radial air outlet, and the aim of pressurizing air and driving the air to flow is achieved mainly by means of the acting of fan blades and the action of centrifugal force, so that the fan belongs to a centrifugal fan.

Different from the traditional centrifugal fan, the installation angle of the centrifugal fan blade of the self-ventilation type double-rotation-direction motor is zero, so that the ventilation effect of the fan along with the positive and negative rotation of the motor is completely the same. Because the mounting angle is zero, the fan blades have a significantly weaker pressure-increasing capacity for air flow than a centrifugal fan rotating in one direction. Meanwhile, the fan blades are radially arranged, so that the end surface shape of a fan flow channel has the obvious characteristics of narrow air inlet and wide air outlet as shown in fig. 1, and the air flow channel is gradually widened from the inlet to the outlet at a constant speed, so that the wall attachment performance of air and the blades is gradually deteriorated along with the movement of air flow, and a relatively obvious air flow separation and outlet backflow area is generally formed near the outlet, so that the outlet is blocked, and the through-flow efficiency of the fan is influenced.

Therefore, how to improve the through-flow efficiency of the fan is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a fan impeller of an electric motor, which has a high fan flow efficiency.

In order to achieve the purpose, the invention provides the following technical scheme:

a motor fan impeller comprises a front cover plate and a rear cover plate which are sequentially arranged along the axial direction, wherein a hub is fixedly arranged between the front cover plate and the rear cover plate, and a plurality of blades are sequentially and fixedly arranged on the hub along the circumferential direction; an air inlet is formed in the center of the front cover plate, and an air outlet channel is formed between adjacent blades, so that wind can enter through the air inlet along the axial direction and then flow out through the air outlet channel along the radial direction;

in the airflow direction, the blade comprises an inlet structure and an outlet structure in sequence;

the inlet structure is a plane symmetrical structure, and the symmetrical plane is a 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 deformation surface, and the deformation surface gradually deviates from the corresponding symmetrical plane along the airflow direction, wherein the outlet structure is corresponding to the symmetrical plane of the inlet structure in the same blade.

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

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

Preferably, all the blades are identical in structure and are uniformly arranged.

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

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

Preferably, the outlet structure comprises two tail plates which are sequentially arranged along the circumferential direction, the two tail plates are respectively arranged at two sides of the corresponding symmetrical plane, and the deformation surface is arranged on the circumferential end surface of the tail plate far away from the other tail plate; along the airflow direction, the two tail plates swing towards the direction gradually far away from the corresponding symmetrical planes respectively, so that the outlet structure forms a branched structure.

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

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.

Preferably, the outlet structure comprises at least two sub-plates in sequence in a direction perpendicular to and away from the front cover plate; each of the branch plates swings towards a direction gradually far away from the corresponding symmetrical plane along the airflow direction, and the adjacent branch plates in the outlet structure are respectively positioned at two sides of the corresponding symmetrical plane; the deformation surface is arranged on the circumferential end surface, far away from the corresponding symmetric plane, of the branch plate.

The invention provides a motor fan impeller, which comprises a front cover plate and a rear cover plate which are sequentially arranged along the axial direction, wherein a hub is fixedly arranged between the front cover plate and the rear cover plate, and a plurality of blades are sequentially and fixedly arranged on the hub along the circumferential direction. An air inlet is formed in the center of the front cover plate, and an air outlet channel is formed between adjacent blades, so that wind can enter through the air inlet along the axial direction and then flow out through the air outlet channel along the radial direction. In the direction of the gas flow, the blade comprises an inlet structure and an outlet structure in sequence. The inlet structure is a plane symmetrical structure, and the symmetrical plane is a 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 deformation surface, and the deformation surface gradually deviates from a corresponding symmetrical plane along the airflow direction, wherein the outlet structure corresponds to the symmetrical plane of the inlet structure in the same blade.

The air current gets into from the air intake, axial flow earlier becomes along radial flow gradually, when flowing through the blade, the circumference terminal surface that pastes the entry structure of blade earlier flows, the circumference terminal surface that pastes the exit structure of blade again flows, wherein, because the last deformation face that sets up of exit structure, compare in prior art straight blade, every deformation face can slow down the circumference expansion trend of air current passageway, can weaken the wall of air current in fan exit drop phenomenon and export backward flow phenomenon to a certain extent, thereby improve the acting capacity of fan and the convection heat dissipation efficiency in the motor frame, improve fan through-flow efficiency. In addition, the inlet structure is a plane symmetrical structure, so that the influence on the bidirectional rotation capacity of the impeller can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a conventional fan backflow phenomenon in the prior art, wherein X is a fan rotation direction, C is a forward air flow, and D is a reverse air flow;

FIG. 2 is a schematic diagram of the suppression of backflow by the forked blades in the impeller according to the first embodiment of the present invention, where X is the rotation direction of the fan, and C is the forward airflow;

FIG. 3 is an axial view of an impeller according to a first embodiment of the present invention, with solid arrowed lines indicating airflow;

FIG. 4 is a radial cross-sectional view of the impeller, with O being the center line of rotation of the hub and fan, and the arrows on the dashed lines indicating directions perpendicular to and away from the front cover plate, in accordance with a first embodiment of the present invention;

FIG. 5 is a block diagram of a blade in an impeller according to one embodiment of the present invention;

FIG. 6 is a partial block diagram of an impeller according to a first embodiment of the present invention;

FIG. 7 is a partial block diagram of an impeller according to a second embodiment of the present invention;

FIG. 8 is an axial view of an impeller according to a second embodiment of the present invention;

FIG. 9 is a partial block diagram of an impeller according to a third embodiment of the present invention;

FIG. 10 is an axial view of an impeller according to a third embodiment of the present invention;

FIG. 11 is a partial block diagram of an impeller according to a fourth embodiment of the present invention;

FIG. 12 is an axial view of an impeller according to a fourth embodiment of the present invention;

fig. 13 is a structural view of a blade of an impeller in the fifth embodiment of the present invention.

Reference numerals:

symmetry plane S, airflow direction Q;

an inlet arrangement 1;

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

the blade 3, the air outlet channel 31, the air inlet edge 32 and the air outlet edge 33;

a front cover plate 4, an air inlet 41;

a hub 5;

a rear cover plate 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The core of the invention is to provide the fan impeller of the motor, and the through-flow efficiency of the fan is higher.

The first embodiment of the fan impeller of the motor provided by the invention is used in the field of cooling power components of a double-rotation-direction motor of electrical equipment, and please refer to fig. 2 to 6, and comprises a front cover plate 4 and a rear cover plate 6 which are sequentially arranged along an axial direction. The 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 generally integrated. A plurality of blades 3 are sequentially and fixedly arranged on the hub 5 along the circumferential direction, and the blades 3 mainly act on the airflow to improve the total pressure of the airflow. Both the front cover plate 4 and the rear cover plate 6 do not have gaps with the blades 3, the front cover plate 4 and the rear cover plate 6 mainly play a role in guiding and supporting the blades 3, an air inlet 41 is formed in the center of the front cover plate 4, and an air outlet channel 31 is formed between the adjacent blades 3, so that wind can enter axially through the air inlet 41 and then flow out radially through the air outlet channel 31 as shown in fig. 4.

For each blade 3, the air flow direction Q refers to the direction of the air flow that follows it. In the direction of the gas flow Q, the blade 3 comprises, in succession, an inlet structure 1 and an outlet structure 2.

The inlet structure 1 is a plane symmetric structure, and the symmetric plane S is a plane where the rotation center line of the hub 5 is located. Specifically, the inlet structure 1 is a straight plate-shaped structure, and both circumferential end surfaces thereof are planes parallel to the symmetry plane S, and may also be in other shapes with unequal thickness.

In the outlet structure 2, at least part of the circumferential end surface is a deformation surface 21, and the deformation surface 21 gradually deviates from a symmetry plane S corresponding to the inlet structure 1 in the same blade 3 along the airflow direction Q. Both ends of the outlet structure 2 in the circumferential direction are circumferential end surfaces, and as shown in fig. 2, deformation surfaces 21 are disposed on both circumferential end surfaces. Specifically, along airflow direction Q, exit structure 2 extends to the tail end of blade 3 by the middle part of blade 3, and exit structure 2's initial position specifically can set up as required, and the tail end is the tail end of blade 3.

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 airflow enters from the air inlet 41, flows axially first, and gradually flows along the radial direction, and when flowing through the blade 3, flows along the circumferential end surface of the inlet structure 1 of the blade 3 first, and then flows along the circumferential end surface 24 of the outlet structure 2 of the blade 3, wherein, because the outlet structure 2 is provided with the deformation surface 21, compared with the straight blade 3 in the prior art, each deformation surface 21 can slow down the circumferential expansion trend of the airflow channel, such as the deformation surface a in fig. 2, the expansion trend can be slowed down on the right side of the airflow channel on the left side thereof, and the wall falling phenomenon and the outlet backflow phenomenon of the airflow at the fan outlet can be weakened to a certain extent, thereby improving the working capacity of the fan and the convection heat dissipation efficiency in the motor base. In addition, since the inlet structure 1 has a plane-symmetric structure, the influence on the bidirectional rotation capability of the impeller can be reduced.

Further, the two circumferential end surfaces 24 of the outlet structure 2 are located at two sides of the corresponding symmetric plane S, so that structural consistency of the two circumferential end surfaces 24 of the outlet structure 2 can be improved, and bidirectional rotation capability of the impeller can be improved. More preferably, as shown in fig. 5, the two circumferential end surfaces 24 of the outlet structure 2 are plane-symmetrical with respect to the symmetry plane S, so as to further ensure that the power capacities of the impellers in forward and reverse rotation are completely the same.

Further, as shown in fig. 3 and 5, the deforming surface 21 is parallel to the axial direction, and more specifically, is disposed on a plane parallel to the axial direction, facilitating the processing.

Further, as shown in fig. 3, along the airflow direction Q, the distance between two circumferentially adjacent inlet structures 1 of the air outlet channel 31 gradually increases, and the partial distance 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 decreases, and the occurrence of the backflow phenomenon can be further avoided. Of course, in other embodiments, the partial distance between two circumferentially adjacent outlet structures 2 may also gradually increase in the airflow direction Q, but the increasing speed is less than the increasing speed of the distance between two circumferentially adjacent inlet structures 1 of the wind outlet channel 31.

Further, as shown in fig. 3, all the blades 3 have the same structure and are uniformly arranged, so that the working capacity of the impeller can be ensured, and the processing is convenient.

Further, as shown in fig. 3 and 6, the outlet structure 2 includes two end plates 22 sequentially arranged along the circumferential direction, and the two end plates 22 are respectively disposed on two sides of the corresponding symmetry plane S. Specifically, the tail plate 22 may be a straight plate with equal thickness, or may be a plate with unequal thickness or a non-straight plate structure. For each end plate 22, its deformation surface 21 is arranged on a circumferential end surface of the end plate 22 facing away from the other end plate 22 in the same outlet structure 2, i.e. the circumferential end surface of the outlet structure 2 facing away from the other end plate 22 of each end plate 22 is a circumferential end surface 24 of the outlet structure 2. Preferably, the entire circumferential end surface of the outlet structure 2 is the deformed surface 21. Along the direction of flow Q, the two endgates 22 are each pivoted towards a direction gradually away from the corresponding plane of symmetry S, so that the outlet structure 2 forms a bifurcated structure, which, due to its arrangement, makes it possible to lighten the blade 3 while making the outlet structure 2 have the deformed surface 21.

In addition, as shown in FIG. 2, the divergence angle between the two endgates 22 in the exit structure 2 ranges from 0 to 180. Further, as shown in fig. 4, the inlet edge 32 and the outlet edge 33 of the blade 3 may be linear or non-linear. In the direction of flow Q, the inlet edge 32 is in particular the starting edge of the inlet structure 1 and the outlet edge 33 is the trailing edge of the outlet structure 2. The included angle beta between the air inlet edge 32 and the rotation center line O of the impeller is 0-180 degrees, and the included angle beta between the air outlet edge 33 and the rotation center line O is 0-90 degrees.

The bispin to motor from ventilation centrifugal fan impeller with circumference branching form blade that provides in this embodiment, based on exit structure 2's setting, can solve traditional bispin to motor from ventilation fan export backward flow serious, the secondary flow loss is great, the poor problem of through-flow effect, and simultaneously, through blade 3's symmetrical structure's setting, can satisfy the requirement of just reversing, for guaranteeing that cooling radiating effect is the same under the condition of just reversing, satisfy just reversing under the prerequisite unanimous to air current working capacity, compare the flow with current self-ventilation fan, efficiency is higher, aerodynamic performance is better.

Of course, the outlet structure 2 is not limited to be provided as a diverging structure in the first embodiment. As shown in fig. 7 and 8, the outlet structure 2 is a solid plate-like structure for easy processing.

In addition, the deformed surface 21 is not limited to be provided 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 10, in the 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.

When the front cover plate 4 is of a straight structure, the direction perpendicular to the front cover plate 4 is consistent at each position in the airflow direction Q, and when the front cover plate 4 has an arc-shaped surface, the direction perpendicular to the front cover plate 4 at different positions of the front cover plate 4 is specifically the direction perpendicular to each point tangent plane of the front cover plate 4.

That is, in the present 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, and as shown in fig. 9, the deformed surface has a gradual trend in both the airflow direction Q and the direction perpendicular to the front cover plate 4, so that the backflow problem of the air outlet channel 31 can be locally improved.

In addition, in contrast to the first exemplary embodiment, the two circumferential end faces of the outlet structure 2 may also not be plane-symmetrical with respect to the plane of symmetry S. In a fourth embodiment, as shown in fig. 11 and 12, the outlet structure 2 comprises in sequence at least two partial plates 23 in a direction perpendicular to the front cover plate 4 and away from the front cover plate 4. Each partial plate 23 is pivoted in the direction of the air flow Q in a direction gradually away from the corresponding plane of symmetry S, and adjacent partial plates 23 in the outlet structure 2 are located on either side of the corresponding plane of symmetry S. The deformation surface 21 is disposed on a circumferential end surface of the sub-plate 23 away from the symmetry plane S. Specifically, in the present embodiment, two sub-plates 23 are provided, and in other embodiments, three or other numbers of sub-plates 23 may also be provided. In this embodiment, each of the sub-plates 23 can reduce the backflow phenomenon in one of the rotation directions of the impeller.

Furthermore, unlike in the first embodiment, the deforming surface 21 may be provided on only one of the two circumferential end surfaces 24 of the outlet structure 2. In the case of the vane 3, as shown in the fifth embodiment of fig. 13, the circumferential end surface on the left side of the outlet structure 2 is the deformation surface 21, while the circumferential end surface on the right side is a surface parallel to the corresponding plane of symmetry S, with no gradual trend, not the deformation surface 21.

It will be understood that when an element is referred to as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. 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 terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The centrifugal fan impeller of the double-rotation-direction motor provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The motor fan impeller is characterized by comprising a front cover plate (4) and a rear cover plate (6) which are sequentially arranged along the 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 sequentially and fixedly arranged on the hub (5) along the circumferential direction; an air inlet (41) is formed in the center of the front cover plate (4), and an air outlet channel (31) is formed between the adjacent blades (3), so that wind can enter through the air inlet (41) along the axial direction and then flow out through the air outlet channel (31) along the radial direction;

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 a symmetrical plane (S) is a plane where a rotation center line of the hub (5) is located;

in outlet structure (2), at least part circumference terminal surface (24) are out of shape face (21), along the air current direction, out of shape face (21) the gradual deviation is corresponding plane of symmetry (S), wherein, outlet structure (2) with same in blade (3) entry structure (1) plane of symmetry (S) corresponds.

2. Electric motor fan impeller according to claim 1, characterized in that the two circumferential end faces (24) of the outlet structure (2) are located on either side of the corresponding symmetry plane (S).

3. Electric motor fan impeller according to claim 2, characterized in that the two circumferential end faces (24) of the outlet structure (2) are plane-symmetrical with respect to the corresponding symmetry plane (S).

4. The electric motor fan impeller as claimed in claim 1, characterized in that all the blades (3) are structurally identical and are arranged uniformly.

5. The electric motor fan impeller as claimed in claim 1, characterized in that the deformation surface (21) is parallel to the axial direction.

6. The electric motor fan impeller as claimed in claim 1, characterized in that, in the direction of the air flow, the outlet air duct (31) has a gradually increasing spacing between two circumferentially adjacent inlet structures (1) and a gradually decreasing partial spacing between two circumferentially adjacent outlet structures (2).

7. The electric motor fan impeller as claimed in any of claims 1 to 6, characterized in that the outlet structure (2) comprises two end plates (22) arranged in sequence along the circumferential direction, and the two end 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 end plate (22) far away from the other end plate (22); along the direction of air flow, the two end plates (22) are respectively swung towards a direction gradually away from the corresponding symmetry plane (S) so that the outlet structure (2) forms a bifurcated structure.

8. Electric motor fan impeller according to any of claims 1 to 6, characterized in that the outlet structure (2) is a solid plate-like structure.

9. Electric motor fan impeller according to any of claims 1 to 4, characterized in that the deformation plane (21) deviates gradually from the corresponding symmetry plane (S) in a direction perpendicular to the front cover plate (4) and away from the front cover plate (4).

10. Electric motor fan impeller according to any of claims 1 to 5, characterized in that the outlet structure (2) comprises in sequence at least two partial plates (23) in a direction perpendicular to the front cover plate (4) and away from the front cover plate (4); each of the sub-plates (23) swings in a direction gradually far away from the corresponding symmetrical plane (S) along the airflow direction, and the adjacent sub-plates (23) in the outlet structure (2) are respectively positioned on two sides of the corresponding symmetrical plane (S); the deformation surface (21) is arranged on the circumferential end surface, far away from the corresponding symmetric plane (S), of the sub-plate (23).