JPS6334462Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a rotating rectifier for a brushless exciter that is directly connected to a synchronous machine and rotated to supply excitation current to the rotor field winding of the synchronous machine.

As shown in FIG. 1, the brushless exciter is directly connected to a synchronous machine and operated. 1 is a synchronous machine such as a turbine generator, 2 is a brushless exciter directly connected to this synchronous machine, and AC exciter 3 and this exciter shaft 4.
It consists of a rotating rectifier 5 attached to the. 6 is a bearing stand, 7 is an outer enclosure, and 8 is a floor of an installation foundation.

A circuit diagram of an excitation device using the brushless exciter 2 is shown in FIG. 9 and 10 are stator windings and rotor field windings of the synchronous machine 1, 11 and 12 are stator field windings and rotor armature windings of the AC exciter 3, and 13 is a rectifier of the rotary rectifier 5. An element consisting of a diode, etc. 14 is a protective fuse connected in series to this rectifying element, 15 is an AC side connection wire from the armature winding 12 to the rotary rectifier 5, and 16 is a DC side connection wire from the rotary rectifier 5 to the field winding 10. .

A conventional rotary rectifier of this type is shown in a vertical cross-sectional view in FIG. 18 is the exciter shaft 17
The rectifier wheels 19 and 20 fixed to the rectifier wheels 19 and 20 are heat sink and fuse mounting seats for a plurality of units, which are respectively attached to the inner circumference of the cylindrical portion of the rectifier wheel 18 via an insulating plate 21 with insulating bolts (not shown). A rectifying element 13 is attached to each heat sink 19, and a protective fuse 14 is attached to each fuse mounting seat 20. 22
is a lead support member attached to the heat sink 19, which is made of an insulating material, surrounds the rectifying element 13 in the through hole 22a, and supports from above the lead part 23 that comes out from the rectifying element 13 and connects the protective fuse 14. .

The lead support member 22 is shown in a perspective view in FIG.
The lead support member 22 has a through hole 22a at its center.
2, and mounting bolts 25 are passed through bolt seats 22c provided on both sides of the axially upper middle portion, and the heat sink 19 is attached to the heat sink 19.

Returning to FIG. 3, 26 is a double-threaded conductor rod that passes through the rectifier wheel 18 and is insulated and supported, and connects the heat sink 19 side and the DC side connection wire 16.
The AC side connection line 15 connects the fuse mounting seat 20.

In the conventional device described above, the lead portion 23 that is drawn out from the rectifying element 13, is bent horizontally, and is connected to the protective fuse 14, receives the load due to centrifugal force by the lead support member 22, and is bent to the rectifying element 13. This prevents loads from being applied.

However, in the conventional device, when attaching and detaching the lead support member 22, in order to intersect the rectifying element 13 and the front end 2 of the lead support member 22,
In order to pass the mounting bolt 24 through 2c and tighten it, a large space is required between it and the outer circumference of the exciter shaft 17.
I had to leave a large gap A between them. For this reason, the outer diameter of the rectifier wheel 18 increases, and the centrifugal force increases, resulting in the problem that the wall thickness must be increased or an expensive special alloy material must be used. In addition, rectifying element 1
3 is a through hole 22a of the lead supporting member 22 on all sides.
, which reduced the cooling effect.

This invention was made to solve these problems, and the radial space between the lead support member and the exciter shaft is reduced, allowing the outer diameter of the rectifier wheel to be reduced, reducing weight, and Another object of the present invention is to obtain a rotating rectifier in which the cooling effect of the rectifying element is improved compared to the conventional one.

In the rotary rectifier according to this invention, the heat sink has an L-shape consisting of a horizontal side and a vertical side, a stepped surface is provided at the inner end of the vertical side opposite to the inner surface of the horizontal side, and the lead support member has a front end at the front end. An opening is provided in the center of the lead support member, and rectifying elements are crossed to enclose one half of the side. Bolt seats are provided above both sides of the middle part, and the front end of this lead support member is connected to the inner peripheral surface of the horizontal side of the heat sink. The stepped surfaces on the vertical sides are sandwiched from above and below.

In this invention, the lead support member is inserted in the axial direction along the inner peripheral surface of the horizontal side of the heat sink, the front end is sandwiched between the stepped surface on the vertical side, and the lead support member is attached to the heat sink by passing the mounting bolts through the bolt seats on both sides. The radial space between the exciter shaft and the exciter shaft is reduced so that only the insulation spacing is required, and the outer diameter of the rectifier wheel is reduced. Furthermore, the rectifying element attached to the heat sink is surrounded on only one half side within the opening of the lead support member, improving the cooling effect.

FIG. 5 is a longitudinal cross-sectional view of a rotary rectifying device according to an embodiment of this invention.
Reference numerals 23 and 25 are the same as those in the conventional device.
31 is a rectifier wheel fixed to the exciter shaft 30; 32 is a rectifier wheel 31 fixed to the exciter shaft 30 through an insulating plate 21;
A plurality of heat sinks are attached to the inner circumference of the cylindrical part, forming an L shape with horizontal and vertical sides,
A stepped surface 32a facing the inner surface of the horizontal side is provided at the inner end of the vertical side, and is connected to the lead wire 16 at the vertical side end. 33 is made of insulating material;
The front end 33b is sandwiched between the inner surface of the horizontal side of the heat sink 32 and the stepped surface 32a of the vertical side, and the opening 33a
One half of the rectifying element 13 is surrounded inside, and the lead part 23 is supported from the outside in the radial direction, and the load is received by centrifugal force.

The lead support member 33 is constructed as shown in a perspective view in FIG. Opening 33a from the front end to the center
is provided, which is inserted in the axial direction along the inner surface of the horizontal side of the heat sink 32, and is mounted so as to intersect the rectifying element 13 and surround one half of the side. The lead support member 33 is provided with bolt seats 33c at upper positions on both sides of the axially intermediate portion, and the mounting bolts 25 are passed through the bolt seats 33c.
It is tightened to 2.

To attach the lead support member 33 to the heat sink 32, the rectifying element 13 is attached to the heat sink 32, and the protective fuse 14 is not attached. When the lead support member 33 is inserted in the axial direction along the inner surface of the horizontal side of the heat sink 32,
The opening 33a intersects the rectifying element 13, enclosing one half of the rectifying element 13, and the front end 33b is supported by being sandwiched between the inner surface of the horizontal side of the heat sink 32 and the stepped surface 32a of the vertical side. Then, the mounting bolt 25 is passed through the bolt seat 33c and tightened to the heat sink 32. in this way,
Since the lead support member 33 is installed by being inserted in the axial direction and the mounting bolt 24 of the front end portion 22b as in the above-mentioned conventional method is not required, the gap B between the lead support member 33 and the exciter shaft 30 is only an insulation gap. , and the outer diameter of the rectifier wheel 31 can be made small.

As described above, according to this invention, an L-shaped heat sink having a horizontal side and a vertical side is provided with a stepped surface facing the inner surface of the horizontal side at the inner end of the vertical side,
An opening is provided in the lead support member from the front end to the center, and seats for bolts are provided at the top of both sides of the middle part.The lead support member is inserted along the inner surface of the horizontal side of the heat sink, and the rectifying element is crossed at the opening. One half of the side is enclosed, the front end is sandwiched between the inner surface of the horizontal side of the heat sink and the stepped surface of the vertical side, and the mounting bolt is passed through the bolt seat and attached to the heat sink, so the gap between the lead support member and the exciter shaft can be reduced. , the weight can be reduced. Further, since only one half of the rectifying element is surrounded by the opening of the lead support member, the cooling effect is improved compared to the conventional one.

[Brief explanation of drawings]

Figure 1 is a schematic front view of a brushless exciter directly connected to a synchronous machine, Figure 2 is a circuit diagram showing the configuration of the excitation device of the synchronous machine in Figure 1, and Figure 3 is a rotary rectifier of a conventional brushless exciter. Fig. 4 is a longitudinal cross-sectional view of the 3rd
FIG. 5 is a longitudinal sectional view of a rotary rectifier of a brushless exciter according to an embodiment of the present invention, and FIG. 6 is a perspective view of the lead support member shown in FIG. 2...Brushless exciter, 3...AC exciter,
5... Rotating rectifier, 13... Rectifying element, 14...
Protection fuse, 20... Fuse mounting seat, 21...
... Insulating plate, 23 ... Lead part, 25 ... Mounting bolt, 30 ... Exciter shaft, 31 ... Rectifier wheel, 32 ... Heat sink, 33 ... Lead support member, 33a ... Opening, 33b ... Front end Part, 3
3c...Bolt seat. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The rectifier wheel is fixed to the exciter shaft, and the horizontal and vertical sides form an L shape, and the inner end of the vertical side is provided with a stepped surface that faces the inner surface of the horizontal side, and the inner circle of the cylindrical part of the rectifier wheel a plurality of heat sinks attached to the periphery of the rectifier wheel via insulating plates; a plurality of fuse mounting seats attached to the inner circumference of the cylindrical portion of the rectifier wheel via insulating plates; a rectifier element attached to the inner surface of the horizontal side of the heat sink; It consists of a protective fuse attached to a fuse mounting seat and an insulating material, an opening is provided from the front end to the center, bolt seats are provided at the top of both sides of the middle part, and the inner surface of the horizontal side of the heat sink is The rectifying element is inserted into the opening along the axis, one half of the rectifying element is enclosed, and the front end is sandwiched between the inner surface of the horizontal side and the stepped surface of the vertical side of the heat sink, and the rectifying element is inserted into the opening. A brushless exciter is provided with a lead support attached to the heat sink by a mounting bolt passed through the brushless exciter, and the lead part pulled out from the rectifying element and connected to the protection fuse is received from the outside in the radial direction by the lead support. rotating rectifier.