CN219145146U

CN219145146U - Closed air cooling exciter

Info

Publication number: CN219145146U
Application number: CN202222554407.1U
Authority: CN
Inventors: 蔡恒川; 翁祥玲; 吴玉昊
Original assignee: Shandong Qilu Motor Manufacturing Co Ltd
Current assignee: Shandong Qilu Motor Manufacturing Co Ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2023-06-06
Anticipated expiration: 2032-09-26

Abstract

The utility model relates to a closed air cooling exciter, which belongs to the technical field of generator manufacturing and comprises a stator, a rotor and a centrifugal fan rotating together with the rotor, wherein a cover body is arranged on an outer cover of the stator, a gap exists between a circle in the cover body and the rotor, a wind shield is arranged on the side surface of the cover body, the wind shield comprises a wind shield I and a wind shield II, an inner cavity II is arranged in the wind shield II far away from the centrifugal fan, an air inlet hole II is arranged on the inner side wall of the wind shield II, the air inlet hole II is connected with a high-pressure area of an outer circle of the centrifugal fan through an air guide pipe, an inner cavity I is arranged in the wind shield I, an air inlet hole I is arranged on the inner side of the outer circle of the inner cavity I, and the inner cavity I is connected with the inner part of the cover body through the air inlet hole I. The utility model has better sealing effect, can effectively prevent external impurities from entering the inside, and ensures the safe and reliable operation of the exciter.

Description

Closed air cooling exciter

Technical Field

The utility model relates to a closed air cooling exciter, and belongs to the technical field of generator manufacturing.

Background

The exciter is mainly composed of a stator, a rotor, a centrifugal fan rotating together with the rotor, a wind shield and other parts. Under the action of the centrifugal fan, the air pressure in the windshields at the two sides of the exciter is lower than the air pressure outside the exciter, wherein the air pressure at the inner side of the windshields near the centrifugal fan is the lowest, and the low-pressure area is usually called. The air pressure inside the wind shield, which is far from the centrifugal fan, is higher than the low pressure area of the exciter, but still lower than the external atmospheric pressure of the exciter, which is commonly called as a medium pressure area, when the exciter operates, the external air of the exciter can carry impurities to be sucked into the exciter, pollute the internal environment of the exciter, influence the normal operation of the exciter and even cause damage to the exciter.

In order to avoid the entry of external impurities, the gap between the wind shield and the rotor is reduced as much as possible, but the method not only increases the installation difficulty of the wind shield, but also causes friction between the wind shield and the rotor due to the too small gap, thereby causing damage to the rotor. From the practical operation, the sealing structure is not ideal.

Disclosure of Invention

The present utility model aims to solve the above-mentioned problems, and an object of the present utility model is to provide a sealed air-cooled exciter which has a better sealing effect and can effectively prevent external impurities from entering the inside.

The utility model is realized by the following technical scheme:

the sealed air cooling exciter comprises a stator, a rotor and a centrifugal fan rotating together with the rotor, wherein a cover body is arranged on an outer cover of the stator, a gap is reserved between a circle in the cover body and the rotor, a wind shield is arranged on the side face of the cover body, the wind shield comprises a first wind shield and a second wind shield, an inner cavity is arranged in the second wind shield far away from the centrifugal fan, an air inlet hole is formed in the inner side wall of the second wind shield, and the air inlet hole is connected with a high-pressure area of the outer circle of the centrifugal fan through an air guide pipe;

the wind shield is internally provided with an inner cavity I, the inner side of the outer circle of the inner cavity I is provided with an air inlet hole I, and the inner cavity I is connected with the inside of the cover body through the air inlet hole I.

An air high-pressure area is formed at the outer circle air outlet of the centrifugal fan, and an air low-pressure area is formed at the inner circle air inlet of the fan. The wind shield is located in the middle pressure area of the exciter, the external air pressure of the exciter is slightly higher than the internal air pressure at the position, in order to avoid external impurities from being sucked into the exciter, the wind shield is designed into an annular structure with an inner cavity, when the exciter operates, high-pressure air at the air outlet of the outer circle of the centrifugal fan is introduced into the inner cavity of the wind shield through the air guide pipe, the air pressure of the inner cavity of the wind shield is higher than the air pressure of two sides of the wind shield, and therefore the air in the inner cavity of the wind shield is discharged from two sides of the wind shield respectively to form an air sealing layer, and the purpose of preventing the external impurities of the exciter from entering the exciter is achieved. In the low-pressure area of the exciter, because the air pressure difference between the position and the outside of the exciter is large, high-pressure air at the air outlet of the outer circle of the centrifugal fan is discharged through the inner cavity of the first wind shield, the air pressure difference between the low-pressure area and the outside of the exciter is reduced, and an air seal is formed. The utility model has better sealing effect, can effectively prevent external impurities from entering the inside, and ensures the safe and reliable operation of the exciter.

The utility model further improves, the wind shield also comprises a wind shield III, the wind shield III is arranged on the inner side wall of the cover body and is positioned at one end close to the centrifugal fan, an inner cavity is formed between the wind shield III and the inner side wall of the cover body and between the wind shield III and the inner side wall of the wind shield I, and an air inlet hole III is formed in the inner side wall of the wind shield I. And the third wind shield is additionally arranged on the inner side of the first wind shield, so that the sealing effect of the position is further improved.

According to a further improvement of the utility model, the three inner side walls of the wind shield are provided with annular convex edges, and gaps exist between the inner ends of the annular convex edges and the rotor. The labyrinth wind area is designed on the inner side of the wind shield III, so that the wind resistance between the inner side of the wind shield III and the low-pressure area is increased, the air pressure of the inner side of the wind shield III is improved, the air pressure difference between the position and the outer part of the exciter is reduced, and the sealing effect is further enhanced.

In a further development of the utility model, the air inlet opening III is located directly below the gap between the centrifugal fan and the inner wall of the housing. The air pressure difference between the low-pressure area and the outside of the exciter can be furthest guaranteed by the wind shield.

The utility model further improves, the second air inlet hole is positioned at the excircle of the inner side wall of the wind shield. The sealing effect of the second wind shield can be guaranteed to the greatest extent.

According to a further improvement of the utility model, the air inlet hole III is positioned at the outer circle of the inner side wall of the wind shield. The sealing effect of the first wind shield can be guaranteed to the greatest extent.

A further development of the utility model provides that the air guide duct is arranged through the stator.

In addition, the utility model further improves that one end of the air guide pipe, which is close to the centrifugal fan, is fixed on the inner wall of the cover body by using a clamping hoop.

Compared with the prior art, the utility model has the following beneficial effects:

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an embodiment of the present utility model.

In the figure: 1. a first wind shield; 2. a centrifugal fan; 3. a rotor; 4. a stator; 5. an air guide pipe; 6. a second wind shield; 7. a wind shield III; 8. an inner cavity II; 9. an air inlet II; 10. an annular flange; 11. an air inlet hole III; 12. an inner cavity I; 13. an air inlet hole I; 14. a cover body; 15. a low pressure zone; 16. a medium pressure zone; 17. high pressure region.

Detailed Description

The following detailed description of the utility model refers to the accompanying drawings.

The closed air cooling exciter shown in fig. 1 comprises a stator 4, a rotor 3 and a centrifugal fan 2 rotating together with the rotor 3, wherein a cover body 14 is arranged on the outer cover of the stator 4, a gap exists between the inner circle of the cover body 14 and the rotor 3, a wind shield is arranged on the side face of the cover body 14 and comprises a wind shield I1 and a wind shield II 6, an inner cavity II 8 is arranged in the wind shield II 6 far away from the centrifugal fan 2, an air inlet hole II 9 is arranged on the inner side wall of the wind shield II 6, the air inlet hole II 9 is connected with a high-pressure area 17 of the outer circle of the centrifugal fan 2 through an air guide pipe 5, an air low-pressure area 15 is formed at the air inlet of the inner circle of the centrifugal fan 2, and the wind shield II 6 is positioned in a medium-pressure area 16 of the exciter;

an inner cavity I12 is arranged in the wind shield I1, an air inlet hole I13 is arranged on the inner side of the outer circle of the inner cavity I12, and the inner cavity I12 is connected with the inside of the cover body 14 through the air inlet hole I13.

The wind shield further comprises a wind shield III 7, the wind shield III 7 is arranged on the inner side wall of the cover body 14 and located at one end close to the centrifugal fan 2, an inner cavity is formed between the wind shield III 7 and the inner side wall of the cover body 14 and between the wind shield III 1 and the inner side wall of the wind shield I, an air inlet hole III 11 is formed in the inner side wall of the wind shield I1, an annular convex edge 10 is arranged on the inner side wall of the wind shield III 7, a gap exists between the inner end of the annular convex edge 10 and the rotor 3, and the air inlet hole III 11 is located under the gap between the centrifugal fan 2 and the inner wall of the cover body 14.

The second air inlet hole 9 is positioned at the outer circle of the inner side wall of the second wind shield 6, and the third air inlet hole 11 is positioned at the outer circle of the inner side wall of the first wind shield 1.

Wherein, the air guide pipe 5 runs through the stator 4, and one end of the air guide pipe 5 close to the centrifugal fan 2 is fixed on the inner wall of the cover body 14 by using a clamp.

Working principle:

In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments are only required to be referred to each other.

The terms "upper", "lower", "outside", "inside", and the like in the description and in the claims of the present utility model and in the above drawings, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. 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 utility model 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

1. The utility model provides a airtight air cooling exciter, includes stator (4), rotor (3) and centrifugal fan (2) that rotate together with rotor (3), and stator (4) dustcoat is equipped with cover body (14), has the clearance between cover body (14) interior circle and rotor (3), and cover body (14) side is equipped with the deep bead, its characterized in that, the deep bead includes deep bead one (1) and deep bead two (6), is equipped with inner chamber two (8) in the deep bead two (6) that keep away from centrifugal fan (2), is equipped with inlet port two (9) on the inside wall of deep bead two (6), and inlet port two (9) link to each other with high-pressure zone (17) of centrifugal fan (2) excircle through guide duct (5);

an inner cavity I (12) is arranged in the wind shield I (1), an air inlet hole I (13) is arranged on the inner side of the outer circle of the inner cavity I (12), and the inner cavity I (12) is connected with the inside of the cover body (14) through the air inlet hole I (13).

2. The sealed air-cooled exciter of claim 1, wherein the wind deflector further comprises a wind deflector third (7), the wind deflector third (7) is arranged on the inner side wall of the cover body (14) and is positioned near one end of the centrifugal fan (2), an inner cavity is formed between the wind deflector third (7) and the inner side wall of the cover body (14) and the inner side wall of the wind deflector first (1), and the inner side wall of the wind deflector first (1) is provided with an air inlet hole third (11).

3. A closed air cooled exciter according to claim 2, characterised in that the inner side wall of the wind deflector (7) is provided with an annular rim (10), a gap being present between the inner end of the annular rim (10) and the rotor (3).

4. A closed air cooled exciter according to claim 2, characterised in that the inlet aperture tri (11) is located directly below the gap between the centrifugal fan (2) and the inner wall of the housing (14).

5. A closed air cooled exciter according to claim 1, characterised in that the second inlet aperture (9) is located at the outer circumference of the inner side wall of the second wind deflector (6).

6. A closed air cooled exciter according to claim 2, characterised in that the air inlet aperture three (11) is located at the outer circumference of the inner side wall of the wind deflector one (1).

7. A closed air cooled exciter according to claim 1, characterised in that the air duct (5) is provided through the stator (4).

8. A closed air cooled exciter according to claim 1, characterised in that the air duct (5) is secured to the inner wall of the housing (14) by means of clips at the end thereof adjacent the centrifugal fan (2).