阅读说明：本技术 一种直冷发电机定子铁芯前置式通风槽板结构 (Direct-cooling generator stator core front-mounted ventilation slot plate structure ) 是由 徐飞彬 项峰 林鸿辉 张伟 王杭烽 陈中亚 于 2020-06-28 设计创作，主要内容包括：本发明公开了一种直冷发电机定子铁芯前置式通风槽板结构,包括定子铁芯、槽底板和齿压片,定子铁芯包括圆弧形的主体部和位于主体部内圆的齿形部,齿形部沿主体部的轴线周向分布,齿形部之间形成齿形槽；槽底板固定在主体部上,齿压片与槽底板固定,齿压片的起点靠近主体部的内圆；齿压片的终点靠近主体部的外圆,齿压片起点和终点间用平滑曲线连接；两个相邻的齿压片形成通风槽,在发电机的转动方向上,通风槽的起点位于齿形槽的前端。本发明提供了一种直冷发电机定子铁芯前置式通风槽板结构,定子周向相邻绕组间的空间完全敞开,保证最大通风截面积,提高循环风速,加强气流换热效率,冷却效果好。(The invention discloses a front ventilation slot plate structure of a stator core of a direct cooling generator, which comprises the stator core, a slot bottom plate and a tooth pressing sheet, wherein the stator core comprises a circular arc-shaped main body part and tooth-shaped parts positioned in the inner circle of the main body part, the tooth-shaped parts are circumferentially distributed along the axis of the main body part, and tooth-shaped slots are formed among the tooth-shaped parts; the groove bottom plate is fixed on the main body part, the tooth pressing piece is fixed with the groove bottom plate, and the starting point of the tooth pressing piece is close to the inner circle of the main body part; the end point of the tooth pressing piece is close to the excircle of the main body part, and the starting point and the end point of the tooth pressing piece are connected by a smooth curve; two adjacent tooth pressing sheets form a ventilation groove, and the starting point of the ventilation groove is positioned at the front end of the tooth groove in the rotation direction of the generator. The invention provides a direct-cooling generator stator core front-mounted ventilation slot plate structure, wherein the space between circumferentially adjacent windings of a stator is completely open, the maximum ventilation sectional area is ensured, the circulating air speed is improved, the air flow heat exchange efficiency is enhanced, and the cooling effect is good.)

1. A front ventilation slot plate structure of a stator core of a direct cooling generator is characterized by comprising the stator core, a slot bottom plate and a tooth pressing piece, wherein the stator core comprises a circular arc-shaped main body part and tooth-shaped parts positioned in the inner circle of the main body part, the tooth-shaped parts are circumferentially distributed along the axis of the main body part, and tooth-shaped slots are formed among the tooth-shaped parts; the groove bottom plate is fixed on the main body part, the tooth pressing piece is fixed with the groove bottom plate, and the starting point of the tooth pressing piece is close to the inner circle of the main body part; the end point of the tooth pressing piece is close to the excircle of the main body part, and the starting point and the end point of the tooth pressing piece are connected by a smooth curve; two adjacent tooth pressing sheets form a ventilation groove, and the starting point of the ventilation groove is positioned at the front end of the tooth groove in the rotation direction of the generator.

2. The forward ventilating slot plate structure of the stator core of the direct cooling generator as claimed in claim 1, wherein the smooth curve is a straight line or a circular arc line or a spline curve or a streamline curve.

3. The stator core forward ventilation slot plate structure of the direct cooling generator as claimed in claim 1, wherein the vector formed by the starting point and the end point of the tooth pressing piece forms an obtuse angle with the rotating direction vector of the generator.

4. The forward ventilating slot plate structure of stator core of direct cooling generator as claimed in claim 1, wherein the vector formed by the starting point and the end point of said tooth pressing piece forms an acute angle with the vector of the rotation direction of the generator.

5. The direct cooling generator stator core forward ventilating slot plate structure as claimed in claim 1, 2, 3 or 4, wherein the tooth pressing plates are vertically welded on the slot bottom plate.

6. The direct cooling generator stator core forward ventilating slot plate structure as claimed in claim 1, 2, 3 or 4, wherein the inner ring of the slot bottom plate is provided with positioning teeth for positioning.

7. The stator core forward ventilating slot plate structure of the direct cooling generator as claimed in claim 1, 2, 3 or 4, wherein spoilers are arranged in the ventilating slots.

Technical Field

The invention relates to the field of direct-cooling generators, in particular to a front-mounted ventilation slot plate structure of a stator core of a direct-cooling generator.

Background

The installed capacity of a generator is usually limited by the temperature rise of the windings, so the ventilation and heat dissipation system directly determines the economic benefit of the generator. In order to enhance the heat dissipation effect of the stator winding, the stator core of the direct-cooling generator on the market at present is usually in a multi-section type, and the middle of the stator core is separated by a ventilation slot plate. The ventilation slot plate consists of a tooth pressing sheet and a slot bottom plate, the tooth pressing sheet is vertically spot-welded on the slot bottom plate, and the axis of the tooth pressing sheet is superposed with the central line of the tooth part. The rotor is similarly constructed. When the generator rotates, the airflow in the rotor ventilation groove rotates; meanwhile, due to the action of centrifugal wind pressure generated by the rotation motion, air flow flows from the rotor ventilating slot to the stator ventilating slot. The stator ventilation slot has reduced the cross-sectional area in ventilation slot owing to the existence of tooth preforming, hinders the radial air current that the generator rotation arouses and passes through, has reduced cooling cycle wind speed to reduce surface heat exchange efficiency, it is unfavorable to the heat dissipation of motor stator core and winding. In order to further optimize the heat dissipation of the motor and reduce the temperature rise of the stator winding, the structure of the motor ventilation slot plate needs to be improved to solve the problem.

Chinese patent application publication No. CN202798185U, published as 2013, 03, 13, entitled "a wind turbine stator and wind turbine", discloses a wind turbine stator and wind turbine, which includes a yoke, a tooth portion provided on the yoke for enhancing magnetic conductance; a circular bottom groove arranged between the adjacent tooth parts and used for storing the coil wound on the tooth parts and changing the winding direction of the coil; and the positioning groove is arranged on the outer circle of the stator and used for fixing the position of the stator of the wind driven generator. The generator still has the above-mentioned problems.

Disclosure of Invention

In order to overcome the problems that in the prior art, the cross section area of a ventilation groove is reduced by a tooth pressing sheet, and the cooling circulation air speed is reduced, so that the surface heat exchange efficiency is reduced, the invention provides a direct-cooling generator stator core preposed ventilation groove plate structure.

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

a front ventilation slot plate structure of a stator core of a direct cooling generator comprises the stator core, a slot bottom plate and a tooth pressing piece, wherein the stator core comprises a circular arc-shaped main body part and tooth-shaped parts positioned in the inner circle of the main body part, the tooth-shaped parts are circumferentially distributed along the axis of the main body part, and tooth-shaped slots are formed among the tooth-shaped parts; the groove bottom plate is fixed on the main body part, the tooth pressing piece is fixed with the groove bottom plate, and the starting point of the tooth pressing piece is close to the inner circle of the main body part; the end point of the tooth pressing piece is close to the excircle of the main body part, and the starting point and the end point of the tooth pressing piece are connected by a smooth curve; two adjacent tooth pressing sheets form a ventilation groove, and the starting point of the ventilation groove is positioned at the front end of the tooth groove in the rotation direction of the generator.

In the above technical solution, in the rotation direction of the generator, the starting point of the ventilation slot is located at the front end of the toothed slot, and the structure is defined as a front-mounted type. When the rotor of the generator rotates, the rotor drives air to rotate to form centrifugal airflow; the centrifugal airflow formed by rotation of the generator can be fully utilized due to the front arrangement of the tooth pressing plates, the airflow circulation speed near the outer side of the winding in the ventilation groove is increased, and the winding temperature rise is reduced. The technical scheme has simple and compact structure and reasonable design; the space between the circumferentially adjacent windings of the stator is completely open, the maximum ventilation sectional area is ensured, the circulating air speed is improved, the air flow heat exchange efficiency is enhanced, and the cooling effect is good; the curve design is adopted to optimize the pneumatic performance between the ventilation slot plates, and the circulating air speed and the heat exchange efficiency are further improved, so that the temperature rise of the motor is further reduced; the good cooling effect is favorable for reducing the manufacturing cost of the generator.

Preferably, the smooth curve is a straight line or a circular arc line or a spline curve or a streamline curve. And the curve design is adopted to optimize the pneumatic performance between the ventilation slot plates, so that the circulating air speed and the heat exchange efficiency are further improved, and the temperature rise of the motor is further reduced.

Preferably, a vector formed by the starting point and the end point of the tooth pressing piece forms an obtuse angle with a generator rotating direction vector. The structure forms a retroversion of the vent slot.

Preferably, a vector formed by the starting point and the end point of the tooth pressing piece forms an acute angle with a generator rotation direction vector. The structure forms a forward leaning structure of the vent slot.

Preferably, the tooth pressing plates are vertically welded on the groove bottom plate. The structure makes tooth pressure piece be difficult for empting, is convenient for weld and assembly, improves production efficiency.

Preferably, the groove bottom plate overlaps the main body. The structure ensures that the slot bottom plate is tightly combined with the main body part.

Preferably, the inner ring of the groove bottom plate is provided with positioning teeth for positioning. The structure facilitates the positioning and fixing of the slot bottom plate and the main body part.

Preferably, a spoiler is arranged in the ventilation groove. The spoiler plays a role in disturbing flow to the air in the ventilation groove, and resistance is reduced.

The invention has the beneficial effects that: (1) the structure is simple and compact, the design is reasonable, the tooth pressing piece is not easy to topple, the welding and the assembly are convenient, and the production efficiency is improved; (2) the space between the circumferentially adjacent windings of the stator is completely open, the maximum ventilation sectional area is ensured, the circulating air speed is improved, the air flow heat exchange efficiency is enhanced, and the cooling effect is good; (3) the curve design is adopted to optimize the pneumatic performance between the ventilation slot plates, and the circulating air speed and the heat exchange efficiency are further improved, so that the temperature rise of the motor is further reduced; (4) the good cooling effect is favorable for reducing the manufacturing cost of the generator.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic structural view of example 2;

FIG. 3 is a schematic structural view of embodiment 3.

In the figure: stator core 1, main part 1.1, profile of tooth portion 1.2, tooth-shaped groove 1.3, groove bottom plate 2, location tooth 2.1, tooth clamp 3, ventilation groove 4, spoiler 5.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

In the figure: stator core 1, main part 1.1, profile of tooth portion 1.2, tooth-shaped groove 1.3, groove bottom plate 2, location tooth 2.1, tooth clamp 3, ventilation groove 4, spoiler 5.