JPS5961444A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To simplify and effectively discharge water condensed in a rotary electric machine body by twisting a stator frame and spirally inclining projections. CONSTITUTION:A plurality of projections 22 are spirally inclined on a stator frame 21 disposed horizontally at the shaft. The projections 22 disposed at the right side of a plane passing the top A and the lowermost part B of the frame 21 are lowered at the axial side ends from the other ends, and the projections 22b disposed at the left side is lowered at the end of the side opposed to the lower end of the projections 22a. Water condensed in a rotary electric machine is stored on the lower end of the projections 22, and discharged through pipes 23a, 23b communicating between the lower ends of the respective projections 22 from an outlet 27 disposed at the lowermost part of the machine.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a method in which the outer periphery of the stator frame is surrounded by a cylindrical stator frame having a plurality of protrusions extending in five directions along the axis by bending a heat treatment plate into a wave shape. Fully open fan-shaped rotating electric machine (related to two, especially means for discharging water condensed inside the stator frame).

[Technical background of the invention]

As a conventional rotating electric machine of this type, there is one having a structure as shown in FIGS. 1 and 2. That is, a stator frame 2 is installed on a base 1, and the inside of this stator frame 2 (=
A stator core 4 having a stator winding 3 mounted thereon is provided. Further, bearing brackets 5 and 6 are fitted into the opening at the end of the stator frame 2, and a rotary shaft 11 passing through the bearing brackets is rotatably supported. An external fan 12 is attached to the part of the rotating shaft 11 located outside the bearing 8, and a part located inside the bearing 8 (the second part is the part to which the internal fan 13 is attached). The external fan 12 is covered by a cover 14.

By the way, the stator frame 2 is made by corrugating (= bending) a thermally conductive plate and forming a section with a plurality of protrusions 2a parallel to the horizontal axis into a cylindrical shape [7]. The concave portion between the ψ strips 2a serves as a passage for the outside air sent from the external fan 12, and the inside 11- of the protrusion 2a serves as a passage for the inside air sent from the internal fan 13.
The axial end of the profile strip 2a is crushed in the circumferential direction. Therefore, the inside of the rotating electrical machine is cut off from the outside air.

[Problems with background technology]

The interior of a rotating electrical machine with the above structure is maintained in a sealed state (2).However, (2) bearings 7 and 8
There is a small amount of communication with the outside air through the penetration part of the rotating shaft 1] and the gear lubricating port (not shown), and moisture may intrude into the rotating electric machine due to the breathing effect caused by temperature changes. Therefore, when there is a sudden temperature change due to operation or stoppage of the TCLJ converter, condensed water 15 is generated inside, and this condensed water 15 accumulates inside the protrusion 2a located below the axis of the stator frame 2. There was a risk of deterioration of the insulation of the stator winding 3 and corrosion inside the machine.

In order to remove the dew condensation water 15, there is a conventional device with a structure in which a drain hole is provided in each protrusion 2a, and each drain hole is normally closed with a plug, but this structure does not prevent condensation. During the removal work of Yeosu 15, all the stoppers had to be removed one by one, which required a large amount of work, resulting in a large amount of opening movement in terms of work efficiency.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned problems, to easily and reliably drain the water condensed inside the main body of the -1 turn M machine, and to prevent insulation deterioration of the stator winding due to the condensed water (-). It is an object of the present invention to provide a rotating electric machine that can prevent corrosion inside the main body of the rotating electric machine.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following structure. That is, the present invention involves thread-molding the stator frame (two protrusions are arranged in a spiral shape so that water condensed inside the rotating electric machine collects at the lower end of each protrusion). Then, this accumulated water is transferred to the bottom of the rotating electric machine through a pipe (separately provided on the right half circumference and on the left half circumference) that runs between the lower ends of each protrusion. Configured to discharge outside the machine from the discharge port provided in the section 1
It is characterized by ~.

[Embodiments of the invention]

FIG. 3 is a diagram showing the structure of a stator frame in an embodiment of the present invention. In Figure C2, 21 is a cylindrical stator frame in which a plurality of protrusions 22 are provided in a spiral shape (= inclined 17. This stator frame 2) is usually arranged with its axis horizontal. . In this way, the right side 1 of the plane V passing through the top and bottom B of the stator frame (2nd position II, each protrusion 2
2a is formed such that the end on the same side in the direction of the hem is lower than the other end. Each protrusion 22h located on the left side of the cutting plane V
n: Lower side of the lower end of each protrusion 22a located on the right M111 (the two opposing ends are lowered. The stator frame 2 configured in this way) On the half circumference, the vicinity of the top of the end of the F section of each protrusion 22a on the right half circumference and the vicinity of the top of the descending end of each protrusion 22b on the left half circumference are separately circled by pipes 23a and 23h. The pipe 23a is covered in the circumferential direction.
, 2,? B is the portion of the protrusion 22 where the B1 part C2 is located (1 hole 24 is provided. Also, the pipe 2, ?
a, 2 J h's rotary electric iso body bodymost part (2 located part (2) is provided with a discharge port 25. This discharge port 25 is provided with a pipe 23a, 23 h 2 threaded hole 26, and this screw It is configured such that a male screw 27 is screwed into the hole 26 as a plug.The gas pipes 23a, 2,
? Both ends of b are closed.

FIG. 4 is an enlarged perspective view showing the insertion portions of the pipes 23a and 23h constructed as described above. As shown in the figure, pipes 23a, 2, ? a is near the top of the descending end of the protrusion 22 only on the lower half circumference of the stator frame 21 and on the right or left half circumference (the two are connected; the pipe 23
The contact portion between a and 23h and the protrusion 22 is fixed by welding or the like.

FIG. 5+aHhl is a diagram showing an example of manufacturing the stator frame 21 mentioned above. That is, the stator frame 21 is first assembled as shown in the figure (ta).
As shown in FIG. In the same figure
As shown in hl, by threading the stator frame 22 by an angle θ in the circumferential direction, each protrusion 22 is formed to be spirally inclined in the same direction. ” - The angle θ is smaller than the angle between the tops of adjacent protrusions 22.

In this way, each protrusion 22 on the right half circumference of the stator frame 22 is
a is the same (111 descended to the end, and each protrusion 22h on the left half circumference) - the descending end of each protrusion 22a on the right half circumference (2'F descended to the end of the opposing pipe 1) A stator frame 21 is formed.

Figure 6 shows the pipe 2.1a (23h) inserted fl
.

It is a figure showing the composition of the protrusion 22. As shown in this figure, the protrusion 22 has a pipe 2.9a (23
A hole 28 is drilled through which the hole 28 is inserted. This hole 28 is bored in the circumferential direction near the top of the descending end of the strip 22.
23b is a diagram showing the configuration of 23b. As shown in this figure, when the pipes 2.9a and 23b are mounted on the stator frame 21, the protrusions 22 are attached to the portions located inside the protrusions 22.
A hole 24 is provided for communication.

Further, a screw hole 26 constituting a molecule discharge port 25 is bored at the bottom of the rotor 11.

Note that both ends of the pipes 23a and 23h are closed.

A wooden rotary electric machine with a stator frame configured in this way has a
When the moisture that has entered the inside of the rotating electrical appliance condenses into water due to a rapid change in wetness, this condensed water 15 flows under each of the protrusions 22a and 22b located one and a half circles above the lower side of the stator frame 21. JX is round at the end. Next, the condensed water 15 is transferred to the pipe 23a.

2,? From the hole 24 in b to the pipe 23a, 2.9
δT into the inside of h, and pipe 23a,
2,'? fftft is lowered to the bottom of b and stored.

In this way pipe 2,? The condensed water 15 accumulated at the bottom of each of pipes 23a and 23h is
a , 2 , 'l h Exhaust port 2 provided at the bottom of h
By removing the male screw 27 of No. 5, it can be easily and reliably ejected from the machine.

Normally, the discharge port 25 is plugged by the male screw i/27, so that the fully closed structure inside the rotating electric machine is maintained.

In addition, when the inner surface of the stator frame 21 is subjected to face treatment in the manufacturing process of the rotating electric machine (2), excess face may remain inside the rotating electric machine, but even in such cases, the above-mentioned excess face may be removed by condensation. As in the case of water, it can be discharged to the outside of the stator frame 2 quickly and reliably by the same action.

Note that the present invention is not limited to the one embodiment described above. For example, pipe 23a.

In the case where the end of the bar 23b is located inside the strip 22, the end may be left open. The pipes 2, ?a, 23h that connect the lower ends of the pipes 1 to 22 are divided into a plurality of pipes as necessary.
It is also possible to have a structure in which they are individually fixed between the sections b.

〔Effect of the invention〕

According to the present invention, water condensed inside the rotary N machine is collected on the peripheral wall of the stator frame G1 (= the lower end of the slanted protrusions), and then collected between the lower ends of each of the protrusions. The dew condensation water settles inside the pipe that communicates with the water and is discharged to the outside of the rotating electrical machine from the outlet located at the lowest part of the pipe, making it possible to easily and reliably remove the condensed water. Insulation deterioration of the stator winding due to dew water and rotation M
This has the effect of preventing corrosion inside the machine body.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the configuration of a conventional rotary heavy machine. Figure 1 is a sectional view of the upper part, Figure 2 is a sectional view taken along line A-A, and Figures 3 to 7 are FIG. 3 is a diagram for explaining one embodiment of the present invention, and FIG. 3 is Ii'! Figure 4 is an enlarged perspective view of the pipe insertion portion in the stator frame, Figure 5 is a perspective view showing an example of manufacturing the stator frame, Figure 5 is a perspective view showing an example of manufacturing the stator frame. Fig. 6 is a side view of the protrusion through which the pipe 4f1 is passed, and Fig. 7 is a li1 side view of the pipe. 1...Base, 2...Stator frame, 2a...Protrusion, 3
... Stator winding, 4... Stator core, 5, 6...
Bearing bracket, 7, 8...Bearing, 9...Secondary group, lO...Movable core, 11...Solid foot shaft, 12...
External fan, 13... Internal fan, 14... Cover, 15... Condensation water, 21... Stator frame, 22...
Projection, 2? a, 23 h...pipe, 24
...hole, 2-5...discharge port, 26...screw hole, 2
7...Male thread, 28. ...hole. Applicant's representative Patent attorney Takehiko Suzue Figure 3-A Figure 4 1 Factor 5 (b) 9 Figure 6 Figure 7

Claims (1)

[Claims] The heat-resistant l plate is bent into T-forming and the stator frame is twisted and formed in the axial direction (= in a fully open external fan-shaped rotary N machine whose outer periphery is surrounded by a cylindrical stator frame with a plurality of parallel protrusions) By doing so, each of the protrusions is provided in a spirally inclined manner, and at least on the lower circumference of the stator frame (the lower ends of the two protrusions are located on the right half circumference and on the left half circumference). A rotating electrical machine characterized in that each of the pipes is passed through the sea using separate pipes, and a discharge port is provided at a portion of each of the pipes located at the bottom of the main body of the 01 transfer machine.