JPS5967841A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To simply and effectively exhaust condensed water causing the deterioration in the insulation of a stator coil and the corrosion in a rotary electric machine out of the machine by collecting the water condensed in the machine via a capillary tube phenomenon to the lowermost part of the machine and further exhausting the water from an outlet portout of the machine. CONSTITUTION:Condensed water in a rotary electric machine is accumulated in a projecting strip 2a on the lower side half periphery of a stator frame 2. This condensed water is contacted with a strip 16 of woven mesh secured to the inner surface of the frame 2. The strip 16 absorbs condensed water via a capillary tube phenomenon, and moves the condensed water to the ends 16a, 16b disposed at the lowermost part of the machine. In this manner, the condensed water collected to the lowermost part of the machine can be simply and effectively exhausted out of the machine by removing a screw 19 for sealing a threaded hole 18.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a completely enclosed external fan-shaped stator frame whose outer periphery is surrounded by a cylindrical stator frame in which a thermal conductive plate is bent in a waveform to form a plurality of axial protrusions. The present invention relates to a rotating electric machine, and particularly to a means for discharging water condensed inside a stator frame.

[Technical background of the invention]

As a conventional rotating electric machine of this type, there is one constructed as shown in FIGS. 1 and 2. That is, a stator frame 2 is attached to the pace 1, and a stator core 4 having a stator winding 3 mounted thereon is provided inside the stator frame 2.

Bearing brackets 5 are still attached to the openings at both ends of the stator frame 2.
and 6 are fitted, and a rotating shaft 11 passing through the center of a rotor core 10 having a secondary conductor 9 is rotatably attached to the bearings 7 and 8 attached to the bearing brackets 5 and 6. is supported by An external fan 1 is provided at a portion of the rotating shaft 11 located outside the bearing 8.
2 is attached, and an internal ring 13 is attached to the portion located inside the bearing 8. The external fan 12 is covered by a cover 14.

The stator frame 2 in the rotating electric machine configured in this way
This is a member formed into a cylindrical shape by bending a thermally conductive plate into a wave shape to provide a plurality of protrusions 2a that are parallel to the axis. The four parts between the protrusions 2a are connected to the external fan 12.
The inside of the protrusion 2a still functions as a ventilation path for the outside air sent from the internal fan 13. Note that both axial ends of the protrusion 2a are crushed in the circumferential direction.

Therefore, the inside of the rotating electric machine is cut off from the outside air.

[Problems with background technology]

The interior of the rotating electric machine having the above-mentioned structure is maintained in a completely closed state. Strictly speaking, however, there is a small amount of communication with the outside air at the contact parts between the bearings 7 and 8 and the rotating shaft 1, as well as at the gap measurement port (not shown), and due to the breathing effect caused by temperature changes, moisture can enter the inside of the rotating electrical machine. There is an intrusion. Therefore, when there is a sudden temperature change due to the operation or stopping of the rotating electric machine, condensed water 15 is generated inside the rotating electric machine, and this condensed water 15 is inside the protrusion 2a located on the lower half of the stator frame 2. There was a risk of accumulation, deterioration of the insulation of the stator winding 3, and corrosion inside the machine.

In addition, in order to remove the above-mentioned dew condensation water 15, each
There is a conventional device in which a drain hole is provided in a, and the drain hole is usually covered with a plug, but with such a structure, all the plugs have to be removed one by one when removing the condensed water 15. This caused a big problem in terms of work efficiency.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to easily and reliably remove water condensed inside the main body of a rotating electric machine, which causes insulation deterioration of stator windings and corrosion inside the machine. This is achieved by providing a rotating electric machine that can discharge the waste outside the machine.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. That is, the present invention provides the above-mentioned rotating electric machine, in which a mesh-like band having moisture-containing properties and heat resistance is laid on the inner surface of at least the lower half of the stator frame, and is located at the lowest part of the stator frame of the rotating electric machine. It is characterized by having a structure in which a discharge hole is provided in a portion, so that condensed water inside the machine can be discharged from the discharge port by utilizing the capillary phenomenon produced by the above-mentioned mesh-like band.

[Embodiments of the invention]

FIGS. 3 and 4 are diagrams for explaining one embodiment of the present invention. Note that the same parts as in FIGS. 1 and 2 shown above are given the same reference numerals, and detailed description of those parts will be omitted.

In FIG. 3, 16 is a water-containing and heat-resistant mesh-like band. This mesh-like band 16 is laid along the circumferential direction on the inner surface of the stator frame 2 on the lower half of the rotary electric machine and near the stator core 4, and is fixed with an adhesive or a holding metal fitting. . Furthermore, this mesh-like obi 1
6 is divided into two parts at the lowermost portion of the rotating electric machine. Further, in the portion of the stator frame 2 located at the lowest part of the rotating electrical machine, a discharge port 17 is provided at a position sandwiched between each end of the mesh-like band 16 divided into two.

FIG. 4 is a diagram showing the structure of the discharge port 17 at the lowest part of the rotating electric machine. That is, the discharge port 17 has a screw hole 18 bored in the stator frame 2 and a screw that seals the screw hole 18.
)19. The screw holes 18 are bored at positions sandwiched between the respective end portions 16a and 16b of the mesh-like band 16 divided into two parts of the stator frame 2.

This embodiment configured as described above has the following effects. That is, when moisture that has entered the rotating electric machine condenses into water due to a sudden temperature change, this condensed water collects on the protrusions 2a on the lower half of the stator frame 2. This condensed water 15 then comes into contact with a mesh-like band 16 fixed on the inner surface of the stator frame 2. Then, this mesh-like band 16 exhibits a so-called capillary phenomenon and sucks the condensed water 15, and furthermore, the end portion 16h located at the bottom of the rotating electric machine,
The condensed water 15 is moved to 16b. The condensed water 15 that has collected at the bottom of the rotating electric machine in this manner can be easily and reliably discharged to the outside of the machine by removing the screw 19 sealing the screw hole 18. Further, after draining the condensed water 15, the screw hole 18 is sealed with the screw 19, thereby maintaining the completely closed structure of the rotating electric machine.

Note that the present invention is not limited to the one embodiment described above. For example, the outlet 17 has a screw hole 18 and a screw 19.
In short, any structure in which the stator frame 2 is provided with an opening that can be freely opened and closed may be used.

〔Effect of the invention〕

According to the present invention, water condensed inside the rotating electrical machine is collected at the lowest part of the rotating electrical machine by the capillary action produced by the mesh-like band provided on the inner surface of the stator frame, and is further discharged to the outside of the machine from the discharge port. Therefore, it is possible to provide a rotating electric machine in which condensed water, which causes insulation deterioration of stator windings and corrosion inside the machine, can be easily and reliably discharged to the outside of the machine.

[Brief explanation of the drawing]

1 and 2 are a top sectional side view and a sectional view taken along the line A-A showing the structure of a conventional rotating electric machine, and FIGS. 3 and 4 are views showing the structure of an embodiment of the present invention, FIG. 3 is a perspective view of the inside of the stator frame, and FIG. 4 is a sectional view showing the structure of the discharge port at the lowest part of the rotating electric machine. 1...Pace, 2...Stator frame, 2a...Protrusion,
3... Stator winding, 4... Stator core, 5, 6...
・Bearing bracket, 7, 8... Bearing, 9... Secondary conductor, 10... Rotor core, 11... Rotating shaft, 12...
... External fan, 13... Internal fan, 14... Cover, 15... Condensation water, 16... Knitted band, 1
7...Discharge port, 18...Screw hole, 19...Screw. Applicant's representative Patent attorney Takeshi Suzue Syllable 1 Figure 3 Figure 4

Claims (1)

[Claims] In a fully enclosed external fan-shaped rotating electric machine whose outer periphery is surrounded by a cylindrical stator frame in which a thermal conductive plate is bent into a waveform to form a plurality of axial protrusions, the inner surface of at least the lower half of the stator frame is A rotating electric machine, characterized in that a mesh-like band having water-containing properties and heat resistance is laid down, and a discharge port is provided in a portion of the stator frame located at the lowest part of the rotating electric machine.