JPS589545A - Cooling device for ventilation of rotary electric machine - Google Patents

Abstract

PURPOSE:To install a blower having large capacity easily by forming a ventilation flue by a side wall made of concrete mounted at a regular interval from a stator frame, setting up the blower with a shaft parallel with a rotor shaft to the lower end of the ventilation flue and circulating air. CONSTITUTION:The side wall 18 made of concrete is set up at the regular interval from the stator frame 9, and the ventilation flue 30 is formed. A frame 22 is shaped to the lower section of the side wall 18, an air cooling means 21 is formed, the blower 23 is mounted, and air is sucked from an upper section, and forwarded to an air chamber 26 from a lower air channel 24. The air of the air chamber 26 passes through a ventilating hole 9c, cools the yoke 2 of a rotor and a magnetic pole 3 from ventilating guides 11, 12 and returns to the flue 30. On the other hand, the air of the air chamber 26 flows as arrows, a, b, cools a stator and returns to the flue 30. Accordingly, the blower having large capacity can be installed without enlarging a space l between the stator frame 9 and the concrete wall 18, and efficiency can be improved by a merit on a scale.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilation cooling device for a rotating electrical machine, and particularly relates to a ventilation cooling device for a rotating electric machine, and in particular to a ventilation hole for heating and exhaust provided in a stator frame, and a ventilation system in which cooling air circulates through these ventilation holes. The present invention relates to a ventilation cooling device for a rotating electric machine having a cooling means.

Conventionally, there have been various ideas for ventilation cooling means for this type of rotating electric machine in medium-capacity machines, and some have been put into practical use. issue is attracting attention. To deal with this, one idea is to provide a closing plate at the head between the field poles and form the rotor into a cylindrical shape to reduce windage loss on the two sides of the rotor. The configuration of the rotating electric machine and the flow of its cooling air are the first to reduce this windage loss.
As shown in FIG.

In these drawings, 1a is a rotor, 1 is a rotating shaft, and 2 is a rotor.
3 is a salient field pole (hereinafter referred to as a field pole); and 4 is a field coil.

Reference numeral 5 denotes a pole-to-pole closing plate, which closes the space between the field poles 3 to reduce windage loss.

6a is a stator in which a stator coil 6 is wound around a stator core 7 and housed therein. 8 is a stator ventilation duct for passing air for cooling the stator core 7, and 9 is a stator frame having a partition plate 9a inside thereof.

The stator frame 9 is also provided with ventilation holes 9b, 9C, and 9d. Reference numerals 10 and 11 are first ventilation guides for guiding cooling air into the electric machine. Reference numeral 12 denotes a second ventilation guide, which utilizes the fan action of the field poles 3 to reduce the amount of cooling air that tends to flow back toward the side between the field poles.

13 passes between the field poles of the field pole 3 from the ventilation hole 9C,
This is a first blower for forcing air to cool the field coil 4, yoke 2, etc. Reference numerals 14 and 15 are air collecting boxes, which exhaust air from the rear side of the stator core 7 and collect air to the rear side. 16 is a cooler, 17 (17A, 17B, 17C) is a ventilation hole 9
This is a second blower for cooling the stator 6a from the stator 6a.

18 is a concrete side wall.

In such a structure, the field coil 4 is cooled by cooling air blown between the field poles from the ventilation hole 9C by the first blower 13 as indicated by the arrow in the figure. That is, the cooling air passes between the field poles in the axial direction from bottom to top, and reaches the cooler 16 from the end portion of the stator coil 6 through the ventilation holes 9d provided in the stator frame 9. The stator 6a is cooled by blowing air to the rear side of the stator 6a from the air collector box 14 and the ventilation holes 9b by the second blower 17 (17A, 17B, 17C), as shown by the arrow in the figure. This is done by cooling air. That is, the cooling air passes from the popular section 19 formed by the stator frame 9 through the stator ventilation duct 8 to the rotor 1a and the stator 6a.
It escapes into the air gap g between. The cooling air pushed out into the air gap g is bent and enters the stator ventilation duct 8 for exhaust. The air that has passed through the stator ventilation duct 8 for exhaust reaches the cooler 16 via the exhaust section 20.

However, such conventional ventilation cooling devices for rotating electric machines have the following drawbacks. Generator capacity 300~500M
If we manufacture a VA and 600 rpm class model based on the current model with an output coefficient that takes into account economies of scale, we will be able to create a high-pressure fan with a discharge pressure of 300 Aq or more as the blower 17 for cooling the stator 6a. Several units are required. The output coefficient is the product of the product of generator capacity P (KVA) and rotation speed N (rpm), stator inner diameter Dt (+m) squared, and stator core volume thickness L C (-). (RN/DX, Lc).Discharge pressure 300
A (For example, if a counter-rotating type blower is used as one or more blowers 17, the rated air volume is 400 m"/i and the wind pressure is 30 (
h++ mAq specification, and the axial length of one blower 17 reaches 2.5 m or more. When the blowers 17 and the coolers 216 are arranged alternately as shown in FIG. must,
The secondary barrel diameter corresponding to the inner diameter of the concrete side wall 18 becomes larger. This increases the civil engineering and construction costs for manufacturing the concrete frame that houses the generator.

Furthermore, since a large number of blowers 17 are used, the shaft power of the blowers alone is equivalent to about 800 kW, and the windage loss reduction effect expected with the structure shown in FIGS. 1 to 3 is halved.

The present invention has been made in view of the above points, and an object thereof is to provide a ventilation cooling device for a rotating electrical machine that improves the efficiency of a blower and reduces the number of operating machines.

That is, the present invention includes a ventilation cooling means that includes a blower disposed in a concrete pedestal having a popular opening in the side wall of the concrete and parallel to the axis of rotation of the concrete frame, and a concrete structure that communicates with the blower. It is characterized by being formed by a wind tunnel provided in the frame and opened in the concrete side wall, and an air chamber provided on the outer circumferential side of the stator frame through which the wind tunnel and the ventilation hole communicate.

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 4 and 5.

Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the ventilation cooling means 21 includes a blower 23 disposed in a concrete pedestal 22, which has a popular opening in the concrete side wall 18, and whose axis is parallel to the rotating shaft 1. A wind tunnel 24 is provided in the concrete frame 22 so as to communicate with each other and is opened in the concrete side wall 18, and the wind tunnel 24 and the ventilation holes 9b, 9
An air chamber 25 provided on the outer circumferential side of the stator frame 9 communicating with C
It was formed with. That is, the blower 23 is placed in the concrete pedestal 22, and the ventilation hole g is connected from the wind tunnel 24 and the air chamber 25.
Cooling air was sent to the rotor 1a and the stator 6a through the rotor 1a and the stator 6a. The air chamber 25 is formed of a double cylinder as shown in FIG.
Two ventilation holes 9C are provided, and six wind tunnels 24 are provided in the circumferential direction directly connected to the air collecting box 14. Note that 26 is a ventilation hole provided in the air chamber 25, and this ventilation hole 26 and the air collection box 14 are in communication.

By doing this, since no blower is attached to the popular air collection box 14, the stator frame 9 and the concrete side wall 1
By shortening the distance t from 8, it is possible to reduce the civil engineering construction cost when manufacturing the concrete pedestal 22 that houses the generator. In other words, a high-pressure blower such as a counter-rotating blower has a long cylindrical shape with an axial length approximately five times the outer diameter.As shown in FIG.
Since I installed the shaft in 2 parallel to the rotation axis 1,
Even if a blower with twice the outer diameter of the conventional structure (high-pressure large-capacity blower) is installed, the distance between the stator frame 9 and the concrete side wall 18 can be halved.

Furthermore, since it becomes possible to install a high-pressure, large-capacity blower with a large outer diameter, the efficiency of the blower can be improved due to economies of scale. For example, in the case of a counter-rotating blower, the diameter is 500 m and the air volume is 300 m”/viy.
r, wind pressure 300 m+A Q's blower efficiency is 60%, diameter 900 m, air volume 1000 m"/rtix,
The blower efficiency at a wind pressure of 300 mAq is 82%. Moreover, by installing a high-pressure, large-capacity blower that serves both the purpose of cooling the rotor 1a and the stator 6a as in this embodiment, the total number of operating blowers can be reduced.

Therefore, by applying this embodiment, not only can the drawbacks of the conventional system be overcome, but also the efficiency of the blower can be improved and the number of units in operation can be reduced. As a result, the overall efficiency of the generator including the shaft power of the blower can be improved and energy can be saved.

Another embodiment of the invention is shown in FIGS. 6 and 7. In this embodiment, an air chamber 27 is formed on the outer periphery of the stator frame 9, and a partition plate 28 is installed in the axial direction in this air chamber 27 to provide an air collection box 29 for exhaust. In this case, the stator frame 9
Since the air chamber 27 and the air chamber 27 are supported by the partition plate 28, the mechanical strength of the stator frame 9 can be improved and cooling air can flow into the stator 6a in a well-balanced manner.

FIG. 8 shows still another embodiment of the present invention.

In this embodiment, only the axial center portion of the magnetic pole blocking plate 5 of the field pole 4 is removed. Then, an air chamber 27 provided on the outer periphery of the stator frame 9 is provided extending up to the height of the stator frame 9, and a ventilation hole 9e is formed in the stator frame 9 at the upper part of this air chamber 27, and air flows through the ventilation hole 9e. A ventilation guide 30 is provided through which cooling air flows toward the rotor 1a. In this case, the cooling air that flows in from the upper and lower parts of the rotor 1a in the axial direction, that is, the ventilation holes gc and ge, respectively, is exhausted from the central opening in the axial direction, so that the cooling of the rotor 1a is well-balanced. be able to.

As described above, the present invention includes a ventilation cooling means that is connected to a blower that is placed in a concrete frame, has an opening in the side wall of the concrete, and is arranged with its axis parallel to the rotation axis. As shown in the figure, the wind tunnel was installed in the concrete frame and opened in the side wall of the concrete, and the air chamber was installed on the outer circumferential side of the stator frame through which this wind tunnel and the ventilation hole communicated, so that the stator frame and concrete It is now possible to install a blower with a larger capacity than before without increasing the distance from the side wall, making it possible to improve the efficiency of the blower through economies of scale and reduce the number of units in operation, improving the efficiency of the blower. Therefore, it is possible to obtain a ventilation cooling device for a rotating electric machine in which the number of operating machines is reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a conventional rotary electric machine ventilation cooling system, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1.
3 is a sectional view taken along line B-B in FIG. 1, FIG. 4 is a vertical sectional side view of a rotating electrical machine of an embodiment of the ventilation cooling device for a rotating electrical machine of the present invention, and FIG. 6 is a sectional view taken along the line C-C, FIG. 6 is a cross-sectional view of the essential parts of a rotating electrical machine of another embodiment of the ventilation cooling device for a rotating electrical machine of the present invention, and FIG. 7 is a sectional view taken along the line D-D in FIG. 6. FIG. 8 is a longitudinal sectional side view of a rotating electrical machine of still another embodiment of the ventilation cooling device for a rotating electrical machine of the present invention. DESCRIPTION OF SYMBOLS 1... Rotating shaft, la... Rotor, 6... Stator coil, 7... Stator core, 9... Stator frame, 9b
, 98° gd, ge... Ventilation hole, 18... Concrete side wall, 21... Ventilation cooling means, 22... Concrete frame, 23... Air blower, 24... Wind tunnel,
25.27...Air chamber. Agent Patent attorney Hiroshi Nagasaki (/11 or 1 person) Haya l Kuchi (11) Haya 2 Figure 9d. Early 3 Figure 1

Claims (1)

[Claims] 1. A popular type installed in a stator frame that is surrounded by concrete side walls, placed opposite the rotor with a predetermined gap, and that surrounds and supports the stator core wrapped with stator windings. and a ventilation cooling device for a rotating electric machine having ventilation holes for exhaust, and ventilation cooling means for circulating cooling air through these ventilation holes, wherein the ventilation cooling means is placed in the concrete frame and is mounted on the concrete side wall. a blower having a popular opening therein and disposed with its axis parallel to the rotating shaft; a wind tunnel provided in the concrete pedestal so as to communicate with the blower and opening in the side wall of the concrete; A ventilation cooling device for a rotating electrical machine, characterized in that the wind tunnel is formed with an air chamber provided on the outer peripheral side of the stator frame, with which the ventilation hole communicates.