CN206595818U - A kind of motor with temperature with high efficiency function - Google Patents

Abstract

The utility model provides a motor with a high-efficiency cooling function, which includes a casing, a motor body, an end cover and a centrifugal fan, the end cover is installed at the end of the casing, the motor body and the centrifugal fan are arranged inside the casing, and the casing There are multiple air ducts on the top, and each air duct has an air inlet; the centrifugal fan is provided with multiple fan blades; the inner surface of the end cover is fixed with multiple guide vanes; multiple guide vanes are located between the casing and the centrifugal fan . The utility model arranges a plurality of guide vanes on the motor end cover to forcibly separate the cooling air flow from the centrifugal fan, so that the cooling air flow can be introduced into the air duct of the casing to the maximum extent, and finally enter the inside of the motor to cool the motor body; fully The cooling airflow blown by the centrifugal fan is used to avoid unnecessary circumferential flow of the cooling airflow along the centrifugal fan, resulting in the inability of the cooling airflow to diffuse into the motor and the waste of mechanical energy of the airflow.

Description

A motor with efficient cooling function

technical field

The utility model belongs to the technical field of motors, in particular to a motor with a high-efficiency cooling function.

Background technique

Due to the limitation of the shape and size of the compact motor, the internal air volume introduced into the motor has a particularly significant impact on the heat dissipation performance of the motor rotor. In a compact high-efficiency high-speed motor, the centrifugal fan of the motor is usually a radial centrifugal fan. In order to eliminate the heat load caused by the high-speed operation of the motor, the size of the centrifugal fan of the motor is generally designed relatively large, so that the distance between the air outlet of the centrifugal fan and the air inlet of the motor casing is relatively close. Due to the small space, the speed of the cooling airflow from the centrifugal fan is also high. In this case, the circumferential velocity of the cooling airflow is often greater than its radial velocity, which directly causes most of the cooling airflow to flow along the direction of the centrifugal fan. The circumferential flow of the motor cannot be expanded to the inside of the motor to effectively cool the motor, and it also causes a lot of waste of airflow mechanical energy.

Contents of the invention

The purpose of this utility model is to provide a motor with high-efficiency cooling function to overcome the problem that the cooling air blown out by the centrifugal fan of the existing motor flows along the circumferential direction of the centrifugal fan and cannot be diffused into the motor to cool the motor.

In order to achieve the above object, the utility model adopts the following technical solutions to achieve.

A motor with a high-efficiency cooling function, including a casing, a motor body, an end cover and a centrifugal fan, the end cover is installed at the end of the casing, the motor body and the centrifugal fan are arranged inside the casing, and multiple Each air duct has an air inlet; the centrifugal fan is provided with a plurality of fan blades; the inner surface of the end cover is fixed with a plurality of guide vanes; the plurality of guide vanes are located between the casing and the centrifugal fan.

Wherein, the guide vane is composed of a flat section and an arc section, one end of the flat section is connected to one end of the arc section, and the flat section and the arc section are integrally formed.

Furthermore, the other end of the flat plate section faces the casing, and the other end of the arc plate section faces the centrifugal fan.

Furthermore, the number of guide vanes is consistent with the number of air ducts; the air inlet of each air channel corresponds to a guide vane, and the guide vanes are located on one side of the air inlet, which is downstream of the centrifugal fan's rotation direction relative to the air inlet; and The other end of the plate segment is close to the side wall of the side of the air inlet.

In addition, the angle between the tangent c of the arc plate segment towards the end of the centrifugal fan and the flat plate segment is α; the angle between the tangent c of the arc plate segment towards the end of the centrifugal fan and the linear velocity u of the outer circle of the centrifugal fan is θ; α+θ=90°;

Wherein, θ=artan (w/u), w is the relative air velocity at the air outlet of the centrifugal fan, and u is the linear velocity of the outer circle of the centrifugal fan (2);

and

D is the diameter of the outer circle of the centrifugal fan, Z is the number of fan blades of the centrifugal fan, δ is the thickness of the fan blades, b is the width between the outlets of the two fan blades, _n is the speed of the motor body, and Qv is the cooling air flow .

The beneficial effects of the utility model are: by arranging a plurality of guide vanes on the motor end cover, the cooling airflow flowing out of the centrifugal fan is forcibly separated, so that the cooling airflow is introduced into the air duct of the casing to the maximum extent, and finally enters the inside of the motor to affect the motor. The main body is cooled; the cooling airflow blown by the centrifugal fan is fully utilized to avoid unnecessary circumferential flow of the cooling airflow along the centrifugal fan, resulting in the inability of the cooling airflow to diffuse into the motor and the waste of mechanical energy of the airflow.

Description of drawings

Fig. 1 is the schematic diagram of the half-section structure of the utility model motor;

Fig. 2 is the specific structural representation of the utility model end cover and guide vane;

Fig. 3 is the concrete structural representation of casing, end cover, guide vane and centrifugal fan of the present utility model;

Fig. 4 is a partially enlarged view of the guide vane of the present invention arranged between the casing and the centrifugal fan;

Figure 5a is a CFD simulation diagram of the air flow at the air inlet of the casing air duct without installing guide vanes on the end cover;

Figure 5b is a CFD simulation diagram of the air flow at the air inlet of the casing air duct with guide vanes installed on the end cover.

In the figure, 1. casing; 2. centrifugal fan; 3. guide vane, 301. flat plate section, 302. arc plate section; 4. end cover; 5. air outlet; 6. air duct; 7. fan blade, 8 . Air inlet, 9. Motor body.

detailed description

With reference to Fig. 1, the utility model provides a kind of motor with efficient cooling function, comprises casing 1, motor body 9, end cover 4 and centrifugal fan 2, end cover 4 is installed on the end of casing 1, motor body 9 and The centrifugal fan 2 is arranged inside the casing 1; the casing 1 is provided with a plurality of air ducts 6, and each air duct 6 has an air inlet 8; the centrifugal fan 2 is provided with an air outlet 5 and a plurality of fan blades 7.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , a plurality of guide vanes 3 are fixed on the inner surface of the end cover 4 , and the plurality of guide vanes 3 are located between the casing 1 and the centrifugal fan 2 . The guide vane 3 is composed of a flat plate section 301 and an arc section 302 , one end of the flat section 301 is connected to one end of the arc section 302 , and the flat section 301 and the arc section 302 are integrally formed. The other end of the plate section 301 faces the casing 1 , and the other end of the arc plate section 302 faces the centrifugal fan 2 . The number of guide vanes 3 is consistent with the number of air passages 6; the air inlet 8 of each air passage 6 corresponds to a guide vane 3, and the guide vanes 3 are located on one side of the air inlet 8, which is the direction of rotation of the centrifugal fan 2 relative to the inlet. and the other end of the flat panel section 301 is close to the side wall on the side of the air inlet 8 .

When the motor works, the fan blade 7 of the centrifugal fan 2 rotates, and the cooling air is blown out from the air outlet 5 of the centrifugal fan 2. A plurality of guide vanes 3 are arranged on the end cover 4 of the motor of the present invention, and the guide vanes 3 flow out the centrifugal fan 2. The cooling air flow is forcibly separated, so that more cooling air flow is introduced into the air inlet 8 and then flows into the air duct 6, and finally the cold air flowing into the air duct 6 enters the inside of the motor to cool the motor body 9; Composed of the arc plate section 302, the cooling airflow flowing out from the air outlet 5 of the centrifugal fan 2 can be guided into the air inlet 8 to the greatest extent. The utility model makes full use of the cooling airflow blown out by the centrifugal fan 2, avoiding unnecessary circumferential flow of the cooling airflow along the centrifugal fan 2, resulting in the inability of the cooling airflow to diffuse into the motor, and the waste of mechanical energy of the airflow.

Referring to Fig. 4, the angle between the tangent line c of the arc plate section 302 towards the end of the centrifugal fan 2 and the flat plate section 301 is α; the tangent line c of the arc plate section 302 towards the end of the centrifugal fan 2 and the linear velocity u The angle between them is θ; α+θ=90°;

Wherein, θ=artan (w/u), W is the relative air velocity at the air outlet 5 of the centrifugal fan 2, and u is the linear velocity of the outer circle of the centrifugal fan 2;

and

D is the diameter of the outer circle of the centrifugal fan 2, Z is the number of fan blades 7 of the centrifugal fan 2, δ is the thickness of the fan blades 7, b is the width between two fan blades 7 outlets, and n is the rotating speed of the motor body 9, Q _v is the cooling air flow rate.

The value of α can be determined by the above formula.

Referring to Fig. 5a and Fig. 5b, it can be seen from these two CFD simulation diagrams that adding guide vanes 3 to the end cover 4 blocks and diverts the cooling air flow from the air outlet 5 of the centrifugal fan 2 before entering the air inlet 8 The air flow of the cooling air flow is much larger than the air flow when the guide vanes are not added, and the air flow of the circumferential movement is only a small amount. Therefore, after the guide vanes are arranged on the end cover 4 of the utility model, the effect of avoiding the waste of air flow mechanical energy and reducing the temperature of the motor is very significant, and the utility model has a simple structure and low cost, and is suitable for wide application.

Claims (5)

1. a kind of motor with temperature with high efficiency function, including casing (1), motor body (9), end cap (4) and centrifugal fan (2), the end cap (4) is arranged on the end of casing (1), and motor body (9) and centrifugal fan (2) are arranged on the interior of casing (1) Portion, it is characterised in that：The casing (1) is provided with multiple air channels (6), and each air channel (6) has an air inlet (8)；Centrifuge wind Fan (2) is provided with multiple fan blade (7)；The inner surface of the end cap (4) is fixed with multiple stators (3)；Multiple stators (3) Between casing (1) and centrifugal fan (2).

2. there is the motor of temperature with high efficiency function according to claim 1, it is characterised in that：The stator (3) is by flat plate section (301) with arc plate section (302) composition, one end of flat plate section (301) and one end connection of arc plate section (302), flat plate section (301) and Arc plate section (302) is formed in one structure.

3. there is the motor of temperature with high efficiency function according to claim 2, it is characterised in that：The flat plate section (301) it is another One end is towards casing (1), and the other end of arc plate section (302) is towards centrifugal fan (2).

4. there is the motor of temperature with high efficiency function according to claim 3, it is characterised in that：The number of the stator (3) with The number in air channel (6) is consistent；Air inlet (8) one stator (3) of correspondence in each air channel (6), stator (3) is located at air inlet (8) Side, the side be centrifugal fan (2) direction of rotation relative to air inlet (8) downstream；And the other end of flat plate section (301) Side wall close to air inlet (8) side.

5. there is the motor of temperature with high efficiency function according to claim 4, it is characterised in that：Described arc plate section (302) direction Angle between the tangent line c and flat plate section (301) of centrifugal fan (2) one end is α；Arc plate section (302) is towards centrifugal fan (2) one Angle between the tangent line c and centrifugal fan (2) at end cylindrical linear velocity u is θ；α+θ=90 °；

Wherein, θ=artan (w/u), w are the relative air speed at centrifugal fan (2) air outlet (5) place, and u is centrifugal fan (2) Cylindrical linear velocity；

And

<mrow> <mi>u</mi> <mo>=</mo> <mfrac> <mrow> <mi>n</mi> <mi>&amp;pi;</mi> <mi>D</mi> </mrow> <mn>60</mn> </mfrac> <mo>;</mo> </mrow>

D is the outside diameter of centrifugal fan (2), and Z is the quantity of centrifugal fan (2) fan blade (7), and δ is fan blade (7) Thickness, b is the width between two fan blade (7) outlets, and n is the rotating speed of motor body (9), Q_vFor cooling air-flow flow.