JPH07255156A - Structure for fixing exciter of power generator - Google Patents

Abstract

PURPOSE:To provide a fixing structure of an exciter of a power generator which can prevent vibration of the exciter body by ridigly fixing the exciter body to the power generator body without increase of weight of a bearing box. CONSTITUTION:An inlet duct 10 with one end 1 fixed at be left end part (in the figure) of a cover 5 of an exciter body 3 and the other end fixed to an end cover 13a of a power generator body l and an exhaust duct 11 with one end fixed to the right end part (in the figure) of a yoke 4 of the exciter body 3 and the other end fixed to the end cover 13a are provided. The exciter body 13 can be rigidly fixed to the power generator body 1 and vibration of the exciter body 3 can be prevented by supporting both end portions of the exciter body 3 with these ducts 10, 11 and the inside of exciter body 3 is cooled by branching a part of the cooling air circulating in the power generator body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator exciter fixing structure, and is useful when applied to a generator main body when fixing the exciter.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing a fixing structure of a generator-exciter according to a conventional technique. In the figure, 1 is a generator body, 2a and 2b are bearing boxes, 3 is an exciter body, 4 is a yoke, 5 is a cover, 13 is an end cover, 20 is a mounting leg, and 21 is an intake part.

The generator body 1 has end covers 13a and 13b fixed to the left and right ends in the figure, and a bearing box 2a and a bearing box 2a at the center of each of the end covers 13a and 13b.
2b is integrally fixed. An exciter body 3 is arranged on the left side of the generator body 1 in the drawing, and respective rotary shafts (not shown in FIG. 3) are directly connected to each other. Exciter body 3
Has a yoke 4 and a cover 5 fixed to the left end of the yoke 4 in the figure, and is fixed to a foundation (not shown) by mounting legs 20 provided on the outer peripheral surface of the yoke 4. Thus, the exciter body 3 is prevented from vibrating by firmly fixing it using the mounting legs 20. The cooling air for cooling the inside of the exciter body 3 is taken in from the intake portion 21 fixed to the right end portion of the yoke 3a in the drawing as indicated by an arrow in the drawing, and is discharged from the left end portion of the cover 5 in the drawing. It

[0004]

However, in the fixing structure of the generator exciter according to the prior art as described above, it is necessary to use the mounting leg 20 and it is necessary to lengthen the base portion accordingly. That leads to higher costs.

When the end of the yoke 4 is fixed to the end of the bearing housing 2a and the exciter main body 3 is supported by this fixed portion, which is a so-called overhang type structure, the exciter main body 3 vibrates. In order to prevent this, the overall rigidity of the bearing box 2a must be increased, which increases its weight.

In view of the above-mentioned prior art, the present invention is a generator exciter capable of preventing the vibration of the exciter body by firmly fixing the exciter body to the generator body without increasing the weight of the bearing box. It is intended to provide a fixed structure for a machine.

[0007]

A first structure of the present invention that achieves the above-mentioned object is a structure for fixing an exciter machine connected to one end of a generator body, and one end of each structure is at both ends of the exciter body. It is characterized in that it is provided with an intake duct and an exhaust duct which are respectively fixed to the parts and the other ends of which are fixed to the generator body so as to connect the inside of the generator body and the inside of the exciter body.

The second structure of the present invention for achieving the above object is the same as the first structure, wherein one end of either the intake duct or the exhaust duct is opposite to the generator body of the exciter body. It is characterized by being fixed to the upper part of the part.

[0009]

According to the first structure of the present invention, the exciter body is generated by supporting both ends of the exciter body by the intake duct, the exhaust duct, and the connecting portion between the exciter body and the generator body. Firmly fixed to the machine body to prevent vibration of the exciter body. Further, since a part of the cooling air circulating in the generator main body is sucked and exhausted through the intake and exhaust duct, the inside of the exciter main body is always cooled by the fresh cooling air. Therefore, it is possible to prevent the inside of the exciter body from becoming dirty when the outside air is sucked and cooled.

According to the present invention having the second structure, in addition to the same operation as the first structure, the intake duct or the exhaust duct fixed to the end of the exciter body opposite to the generator body. Since a tensile load is applied to the exciter, it is possible to sufficiently support the exciter body without increasing the rigidity.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. The same parts as those in FIG. 3 are designated by the same reference numerals, and duplicated description will be omitted.

FIG. 1 is a side view showing a fixing structure of a generator / exciter according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of FIG. 1 (however, a cooler is added). In both figures, 6 and 14 are rotating shafts, 7 and 17 are stators, 8 and 16 are rotors, and 9 and 15 are
Reference numerals a and 15b are honey, 10 is an intake duct, 11 is an exhaust duct, and 12 is a cooler. Others are the same as those shown in FIG.

Of these, the exhaust duct 10 has a cover 5 of the inside 3 of the exciter machine with a bolt (not shown) at one end thereof.
Is fixed to the left end in the figure, and the other end is fixed to one end cover 13 of the generator body 1 by a bolt (not shown).
It is fixed to a and communicates the inside of the exciter body 3 and the inside of the generator body 1.

The exhaust duct 11 is fixed to the right end portion of the yoke 4 of the exciter body 3 in the figure by a bolt (not shown), and the other end is fixed to the end cover 13a by a bolt (not shown) to excite the magnet. The inside of the machine body 3 and the inside of the generator body 1 communicate with each other.

The rotating shaft 6 of the rotor 8 of the exciter body 3 is directly connected to the rotating shaft 14 of the rotor 16 of the generator body 1. A blade 9 is fixed to the left end of the rotary shaft 6 in the figure. The blade 9 is covered with a cover 5, rotates together with the rotating shaft 6, and is rotated by the rotor 8 of the exciter body 3 or the stator 7 supported by the yoke 4 as shown by an arrow (dotted line) in the figure. Send cooling air to.

The right end of the yoke 4 in the drawing is connected to the left end of the bearing box 2a in the drawing by a connecting means such as a bolt.

The blades 15a and 15b of the generator body 1 are fixed to the left and right ends of the rotary shaft 14 in the figure, and both rotate together with the rotary shaft 14 to rotate the rotor 16 of the generator body 1.
And sends cooling air to the stator 17. The cooling air circulates in the generator body 1 so as to pass through the cooler 12 on the way as indicated by an arrow (solid line) in the figure.

The cooler 12 is fixed to the upper part of the generator main body 1, and the cooling water is supplied and drained as indicated by the arrow (dotted line) in the figure, and the inside of the generator main body 1 is exchanged by heat exchange with this cooling water. Cooling air is flowing.

Therefore, in the above embodiment, as shown in FIGS. 1 and 2, both ends of the exciter body 3 are supported, that is, the yoke 4 is provided.
The right end in the figure is supported by the bearing box 2a and the exhaust duct 11, and the left end in the figure of the cover 5 is the intake duct 1.
The exciter body 3 is fixed to the generator body 1 by being supported by 0. The rigidity of such a fixing structure is much larger than that of the overhang structure not only in the vertical direction but also in all directions, and the vibration of the exciter body 3 in all directions can be reliably prevented.

Further, since the intake duct 10 is fixed to the upper part of the cover 5, the load applied to the intake duct 10 is a tensile load. For this reason, the intake duct 10 can sufficiently support the exciter body 3 without increasing the rigidity of the intake duct 10 to a particular extent.

Further, a part of the cooling air flowing in the generator main body 1 is branched by the intake duct 10 and taken into the cover 5. This sucked cooling air is fed to the rotor 8 by the blade 9.
And sent to the stator 7 to cool them, and then exhaust duct 1
It is again discharged into the generator main body 1 by 1. Therefore, the inside of the exciter body 3 is always cooled by the fresh air. Therefore, it is possible to prevent the inside of the exciter body 3 from being contaminated when the outside air is sucked and cooled.

Further, since the conventional mounting leg 20 is not necessary and the length of the foundation can be shortened accordingly, the cost can be reduced.

[0023]

As described above in detail with the embodiments, according to the present invention, it is possible to securely fix the exciter body to the generator body and prevent the exciter body from vibrating in all directions. it can. Therefore, the conventional mounting legs are not necessary and the length of the foundation can be shortened accordingly,
The cost can be reduced.

Further, since a tensile load is applied to the intake duct or the exhaust duct fixed to the upper part of the end of the main body of the exciter on the side opposite to the main body of the generator, the rigidity is not required to be particularly large. The exciter body can be supported.

[Brief description of drawings]

FIG. 1 is a side view showing a fixing structure of a generator exciter according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG. 1 (however, a cooler is added).

FIG. 3 is a side view showing a fixing structure of a generator exciter according to a conventional technique.

[Explanation of symbols]

 1 Generator Main Body 2a, 2b Bearing Box 3 Exciter Main Body 4 Yoke 5 Cover 6,14 Rotating Shaft 7,17 Stator 8,16 Rotor 9,15a, 15b Honey 10 Intake Duct 11 Exhaust Duct 12 Cooler 13a, 13b End cover

Claims (2)

[Claims] 1. A structure for fixing an exciter connected to one end of a generator body, wherein one end is fixed to both ends of the exciter body and the other end is fixed to the generator body. A structure for fixing a generator exciter, comprising an intake duct and an exhaust duct that connect the inside of the machine body with the inside of the exciter body. 2. The generator exciter fixing structure according to claim 1, wherein one of the intake duct and the exhaust duct has one end located above an end of the exciter body opposite to the generator body. Fixed structure of generator exciter characterized by being fixed.