CN215486799U - Fan and self-ventilation motor using same - Google Patents

Abstract

The utility model discloses a fan and a self-ventilation type motor applying the same, wherein the fan comprises a wheel cover, a wheel hub and a plurality of blades; the blades are arranged between the wheel cover and the hub along the circumferential direction and are distributed along the radial direction of the hub respectively; the blade is provided with a through-flow structure penetrating through two side faces of the blade, and the blade can form a segmented structure through the through-flow structure. In this scheme, at first through setting up the through-flow structure to in the radial distribution design of a plurality of blades is then passed through in order to realize making an uproar of falling of fan, in order to reach the effect of carrying out noise optimization to two positive and negative direction of rotation of fan, has all had the noise reduction effect for reaching clockwise and two anticlockwise direction of rotation of fan promptly.

Description

Fan and self-ventilation motor using same

Technical Field

The utility model relates to the technical field of self-ventilation type motors, in particular to a fan and a self-ventilation type motor using the same.

Background

The aerodynamic noise of self-ventilated traction motors is generated by local rapid changes and intense pulsation of air flow pressure in a fan-based motor cooling and ventilating structure and friction between air and a motor wind path pipeline, and the air flow radiates out of a motor shell along with the air flow. The aerodynamic noise does not stand out when the motor is at low rotational speed, but its radiated power increases geometrically (typically proportional to the rotational speed to the power of 5-6). With the development of the traction motor towards higher working rotating speed, the pneumatic noise rises sharply and becomes a main noise source of the traction motor. The national noise index is becoming stricter, and the inhibition of pneumatic noise is a key bottleneck and a necessary way for the high speed of the traction motor.

In the existing fan noise reduction technical scheme, a group of small holes which are arranged at equal intervals are formed in the tail edge of an airfoil blade, so that flow separation is inhibited, the flow efficiency is improved, and the aerodynamic noise of the fan is inhibited.

However, the existing fan noise reduction technical scheme only performs flow suppression for one rotation direction, and does not perform noise optimization for the forward and reverse rotation directions of the fan; and because the aperture is more, and the aperture is less, and the position accuracy requirement of drilling is higher, has increased manufacturing cost, lacks processing operation space when the blade number is more, is unfavorable for mass production modes such as casting.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a fan, which can achieve a noise reduction effect for both clockwise and counterclockwise rotation directions of the fan.

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

a fan comprising a shroud, a hub and a plurality of blades;

the blades are arranged between the wheel cover and the hub along the circumferential direction, and are distributed along the radial direction of the hub respectively;

the blades are provided with through-flow structures penetrating through two side faces of the blades, and the blades can form a segmented structure through the through-flow structures.

Preferably, the through-flow structure comprises:

and the through grooves are arranged on the blades and penetrate through the two side faces of the blades.

Preferably, the through groove is of an elongated structure, and one end of the through groove extends to the wheel cover, and the other end of the through groove extends to the wheel hub, so that the blade can form a two-segment structure.

Preferably, the through groove is a linear through groove or a curved through groove.

Preferably, the width of the through groove is 1% -3% of the arc length of the blade.

Preferably, the through groove is a linear through groove and is vertically distributed between the wheel cover and the wheel hub.

Preferably, the number of the through grooves is a plurality of the linear through grooves, and the through grooves are distributed at intervals in the airflow direction in sequence;

the number of the through grooves is a plurality of the curved through grooves, and the curved through grooves are distributed at intervals in the airflow direction in sequence;

or the number of the through grooves is a plurality of the linear through grooves and a plurality of the curved through grooves, and the through grooves are sequentially distributed at intervals in the airflow direction in a staggered manner.

Preferably, the through-flow structure is arranged on a part of the blade close to the air outlet of the blade.

Preferably, the flow structure is located at a portion 1/3 after the arc length of the blade.

A self-ventilating electric motor comprising a fan, the fan being as described above.

According to the technical scheme, the fan provided by the utility model has the advantages that the through-flow structure is arranged, so that the noise reduction of the fan is realized, and then the radial distribution design of the blades is adopted, so that the noise optimization effect on the forward and reverse rotation directions of the fan is realized, namely the noise reduction effect on the clockwise and counterclockwise rotation directions of the fan is realized.

The utility model also provides a self-ventilation type motor, which has corresponding beneficial effects due to the adoption of the fan, and specific reference can be made to the foregoing description, so that the detailed description is omitted.

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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a fan according to an embodiment of the present invention;

FIG. 2 is a top view of a fan according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a segmented blade according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic structural view of a segmented blade according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a segmented blade according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a segmented blade according to an embodiment of the present invention;

FIG. 8 is a schematic view of a radial straight blade fan according to an embodiment of the present invention;

FIG. 9 is a schematic view of a non-radial straight blade fan according to an embodiment of the present invention;

FIG. 10 is a schematic view of a non-radial straight blade fan according to another embodiment of the present invention.

Wherein, 1 is the wheel lid, 2 is the wheel hub, 3 is the blade, and 4 is the logical groove.

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 fan provided by the embodiment of the utility model, as shown in fig. 1 and 2, comprises a wheel cover 1, a hub 2 and a plurality of blades 3;

the blades 3 are arranged between the wheel cover 1 and the hub 2 along the circumferential direction, and the blades 3 are distributed along the radial direction of the hub 2 respectively;

the blade 3 is provided with a through-flow structure penetrating through two side surfaces of the blade, and the blade 3 can form a sectional structure through the through-flow structure.

In the present scheme, it should be noted that, as shown in fig. 1, the wheel cover 1 and the wheel hub 2 are concentrically arranged, and form an interval for installing a plurality of blades, and the air inlet of the blade 3 is perpendicular to the air outlet thereof; in addition, the plurality of blades 3 are all straight blades and are respectively distributed along the radial direction of the hub 2, so that the noise reduction effect is achieved on the clockwise and anticlockwise rotating directions of the fan; in addition, the through-flow structure is designed in the scheme, so that air flow can pass through the through-flow structure, and flow separation and aerodynamic noise generated by the flow separation are reduced. Meanwhile, the through-flow structure can enable the blades 3 to form a sectional structure, casting and forming are facilitated, the blades 3 can meet the requirement of mass production, and the following description can be seen in specific details.

According to the technical scheme, the fan provided by the embodiment of the utility model is provided with the through-flow structure, so that the noise reduction of the fan is realized, and the casting and mass production of the fan are facilitated; then through the radial distribution design of a plurality of blades to reach the effect of carrying out noise optimization to fan two positive and negative direction of rotation, all had the noise reduction effect for clockwise and anticlockwise direction of rotation of fan promptly.

Specifically, as shown in fig. 2, the through-flow structure includes:

and a through groove 4 provided in the blade 3 and penetrating both side surfaces thereof. As shown in fig. 3 and 4, the through groove 4 has a square structure, and is suitable for mass production such as casting, thereby facilitating mass production of the fan and reducing production cost.

Further, as shown in fig. 3, the through slot 4 is a long strip structure, and one end of the through slot extends to the wheel cover 1, and the other end of the through slot extends to the hub 2, so that the blade 3 can form a two-segment structure. This scheme design like this has increaseed the through flow area of 3 both sides of blade to in the pressure differential that has reduced 3 suction surfaces of blade and pressure surface better, restrained the separation that flows better, thereby can effectively reduce the noise that the motor produced under high rotational speed more. In addition, logical groove 4 in this scheme is equivalent to the fracture of blade 3 to divide blade 3 into two segmentation structures, and then conveniently cast the shaping, can make blade 3 adapt to the mass production demand with this. Of course, as shown in fig. 7, when the number of through slots 4 is two, the blades 3 may form a three-stage structure, and so on, the sectional structure of the blades 3, which will not be described herein.

Furthermore, in order to enable the fan to obtain a good noise reduction effect; accordingly, as shown in fig. 5 or 6, the through-groove 4 is a linear through-groove or a curved through-groove.

Specifically, in order to take into account the structural strength of the blade 3, and the ease of casting the blade; accordingly, as shown in fig. 3, the width (dimension along the arc length direction of the blade 3) of the through groove 4 is 1% to 3% of the arc length of the blade 3.

In the present solution, as shown in fig. 5, the through slots 4 are straight through slots and are vertically distributed between the wheel cover 1 and the wheel hub 2. This scheme design has characteristics such as through-flow simple structure, casting shaping are simple and easy.

Specifically, the number of the through grooves 4 is a plurality of linear through grooves, and the through grooves are sequentially distributed at intervals along the airflow direction, that is, the through grooves are sequentially distributed at intervals along the arc line of the blade 3;

the number of the through grooves 4 is a plurality of curved through grooves, and the curved through grooves are distributed at intervals in the airflow direction in sequence, namely distributed at intervals in sequence along the arc line of the blade 3;

or, as shown in fig. 7, the number of the through grooves 4 is a plurality of linear through grooves and a plurality of curved through grooves, and the through grooves are sequentially staggered and distributed at intervals along the airflow direction, that is, sequentially distributed at intervals along the arc line of the blade 3. This scheme is through setting up a plurality of logical grooves on blade 3 to make blade 3 produce a plurality of airflow channel, and then can effectively improve the flow separation that the fan produced under high rotational speed, improve the performance of fan, thereby reduce the aerodynamic noise of fan better.

In the scheme, the noise of the fan is easily concentrated at the air outlet; therefore, the noise at the air outlet of the fan is reduced better; accordingly, the through-flow structure is provided at a portion of the blade 3 near its outlet (as shown in fig. 1, the outlet of the blade 3 is located at the outer edges of the shroud 1 and the hub 2). As shown in fig. 3, that is, the through slots 4 are disposed on the blade 3 near the air outlet.

Specifically, in order to take into account the noise reduction effect of the fan, and the convenience of its casting and demolding; accordingly, as shown in fig. 3, the flow structure is located at the rear 1/3 of the arc length of the blade 3, i.e. the through slots 4 are located at the rear 1/3 of the arc length of the blade 3.

The embodiment of the utility model also provides a self-ventilation type motor which comprises the fan. Because the fan is adopted in the scheme, the fan also has corresponding beneficial effects, and specific reference can be made to the previous description, so that the detailed description is omitted.

The scheme is further described by combining the specific embodiment as follows:

the technical problem to be solved by the utility model is as follows:

the self-ventilation type motor is a motor with a fan and a rotor which are coaxial, so that the rotating speed of the fan and the rotating speed of the motor are the same. The fan is a core heat dissipation component in the motor and is used for providing air quantity required by the motor during operation and meeting the heat dissipation requirement during the operation of the motor. Because of the special working environment of the self-ventilation type traction motor, the fan is required to have the same working performance when the motor rotates forwards and backwards, so that the centrifugal fan of the traction motor generally adopts a radial straight blade form, generally speaking, the fan has lower working efficiency, and a flow field in the fan is easy to flow and separate at a high rotating speed to generate a large amount of air backflow and vortex, thereby generating a serious aerodynamic noise problem.

The utility model provides a centrifugal fan for a self-ventilation type traction motor, which can effectively reduce the pneumatic noise generated by the self-ventilation type traction motor at high rotating speed under the condition of meeting the heat dissipation requirement of the self-ventilation type traction motor, so that the traction motor meets increasingly strict environmental protection requirements. Meanwhile, compared with the traditional scheme, the scheme has the advantage of being suitable for large-scale manufacturing modes such as casting and the like.

The blade centrifugal fan suitable for all self-ventilation type traction motors is beneficial to batch production, improves the efficiency of the fan, and can effectively reduce the noise generated by the motor at high rotating speed.

The technical scheme of the utility model is elaborated in detail:

as shown in fig. 1, a centrifugal fan for a self-ventilation type traction motor includes a wheel cover 1, a hub 2, and a segmented blade 3. The air inlet end of the hub 2 is provided with a threaded hole and can be fixed with a traction motor rotor through a bolt. The blades 3 are in the form of radial sectional straight blades, and the inlet angle and the outlet angle of the impeller airflow are both 90 degrees. The blades 3 are designed in a sectional manner, as shown in fig. 3, each blade can be divided into two or more sections according to actual needs, a gap (i.e., the through groove 4) with a certain width is formed in the middle of each blade, and the cross section of the gap is in a straight line shape (only one gap is shown in fig. 5, actually, a plurality of gaps are shown in fig. 6), a curve shape (only one gap is shown in fig. 6, actually, a plurality of gaps are shown in fig. 6), or any combination of the straight line shape and the curve shape (for example, three blades are shown in fig. 7, and the cross section of the gap in this patent can be formed by any gaps between a plurality of straight lines and a plurality of curves in any shape).

This scheme is through one or more clearances that arrange on the sectional type blade for blade pressure side and suction side have produced airflow channel, and through the size and the row form and the position of rational design segmentation clearance, the flow separation that can effectively improve the fan and produce under high rotational speed improves the performance of fan, and then reduces the aerodynamic noise of fan.

The key points and points to be protected of the utility model are:

1. the design has the advantages that the single blade is divided into two or more sections, the shape of the gap between the sections can be a straight line, a curve and any combination of a plurality of straight lines and curves, the gap is hollow, and air flow can pass through the gap, so that flow separation and aerodynamic noise generated by the flow separation are reduced, and the fan has noise reduction effect in both clockwise and anticlockwise rotating directions.

2. The segmented blade design can be used for reducing noise of a radial straight blade fan (shown in figure 8) commonly used by a rail transit traction motor and can also be used for reducing noise of a non-radial straight blade fan (the inlet angle and the outlet angle of the fan can be any angle and are not limited to 90 degrees, shown in figures 9 and 10) used for heat dissipation of motors in other industries.

The utility model (utility model) has the advantages that:

1. the casting molding is convenient, and the requirement of mass production is met.

2. The existing fan of the motor can be directly replaced without changing the existing other structures of the motor.

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 previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A fan, characterized by comprising a shroud (1), a hub (2) and a plurality of blades (3);

the blades (3) are arranged between the wheel cover (1) and the hub (2) along the circumferential direction, and the blades (3) are distributed along the radial direction of the hub (2);

the blades (3) are provided with through-flow structures penetrating through two side faces of the blades, and the blades (3) can form a sectional type structure through the through-flow structures.

2. The fan of claim 1, wherein the through-flow structure comprises:

and a through groove (4) which is arranged on the blade (3) and penetrates through two side surfaces of the blade.

3. The fan according to claim 2, characterized in that the through slot (4) is of an elongated structure and extends at one end to the shroud (1) and at the other end to the hub (2), so that the blade (3) can form a two-piece structure.

4. The fan according to claim 3, characterized in that said through slots (4) are rectilinear or curvilinear.

5. The fan according to claim 4, characterized in that the width of the through slots (4) is between 1% and 3% of the arc length of the blades (3).

6. The fan according to claim 4, characterized in that said through slots (4) are rectilinear and are vertically distributed between said shroud (1) and said hub (2).

7. The fan according to claim 4, wherein the number of the through slots (4) is a plurality of the straight through slots, and the straight through slots are sequentially distributed at intervals along the airflow direction;

the number of the through grooves (4) is a plurality of the curved through grooves, and the curved through grooves are distributed at intervals in the airflow direction in sequence;

or the number of the through grooves (4) is a plurality of the linear through grooves and a plurality of the curved through grooves, and the through grooves are distributed at intervals along the airflow direction in a staggered mode in sequence.

8. The fan according to claim 1, characterized in that the through-flow structure is arranged at the portion of the blade (3) close to its outlet.

9. The fan according to claim 8, characterized in that the through-flow structure is located 1/3 behind the arc length of the blade (3).

10. A self-ventilating electric motor comprising a fan, wherein the fan is as claimed in any one of claims 1 to 9.

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