JPS6211183Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof mechanism for a completely enclosed external sector waterproof rotary machine.

Rotating machines are installed and used in a wide variety of environments; for example, they may be exposed to harsh weather conditions, exposed to suspended matter, acids, alkalis, salts, gases, etc., or exposed to foreign substances. Rotating machines must be protected against intrusion, falling objects, colliding objects, etc. This affects the mechanical and electrical form and structure when viewed from the rotating machine side. In this way, many types of rotating machines have been proposed so that the same rotating machine can be adapted to various environments and usages.

Conventionally, as one of these various rotating machines, it is used in an atmosphere with a lot of water droplets around it.
There is a completely enclosed external fan type waterproof rotary machine. This is a structure in which the outer sheath of the rotating machine is closed, and even if water is poured into the outer sheath, water droplets do not enter the inside of the machine. Therefore, a type of rotating machine that does not allow surrounding outside air to flow through the inside of the rotating machine, but allows the outside air to pass through the outer covering surface using an external fan attached to the rotating shaft to cool down the heat increase caused by the drive of the rotating machine. It is.

By the way, in this conventional fully enclosed external fan type waterproof rotating machine, as shown in Fig. 1, when the rotor of the rotating machine 1 rotates, the external fan fan 3 attached to the end of the rotating shaft 2 simultaneously rotates. and outside fan cover 4
It is drawn into the outer fan cover 4 through a wire mesh 5 provided in the outer fan cover 4. At this time, water droplets contained in the outside air are also drawn in. The drawn outside air then passes through the ventilation duct section 7 between the outer fan cover 4 and the outer cover 6 of the rotating machine 1, contacts the surface of the outer cover 6, and cools the rotating machine. Here, a part of the water droplets drawn into the outside fan cover 4 together with the outside air passes through the duct part 7 and is discharged outside together with the outside air again, but the other part is provided in the center of the bracket 8. It falls onto the bearing part 9. Therefore,
This bearing portion 9 has a waterproof bearing structure in which a specially shaped sealing material is combined to prevent water droplets from entering the rotating machine 1 from the outside.

However, this conventional fully enclosed external fan waterproof rotary machine,
Bearing part 9 on the side where the external fan 3 is attached in the rotating machine 1
Since it has a complicated waterproof bearing structure, it is difficult to manufacture, and it also has the drawback that the overall size of the rotating machine 1 becomes large. Furthermore, when performing maintenance and inspection of the rotating machine 1, there is a problem in that it is difficult to perform maintenance and inspection due to its complicated structure.

The present invention has been proposed in order to eliminate the drawbacks of such conventional fully enclosed external fan type waterproof rotary machines. That is, the object of the present invention is to provide an annular drain plate with the tip facing toward the outer circumferential side of the fan on the surface of the external fan of a completely enclosed external fan-type waterproof rotating machine that faces the rotating machine bracket; The bracket is provided with a gutter-like water receiving part in a circumferential manner opposite to the draining plate, and the external fan and the draining plate splash off the water droplets that have entered, and the water droplets are received by the water receiving part and then the rotating machine It is an object of the present invention to provide a waterproof mechanism for a completely enclosed external fan-shaped waterproof rotary machine that prevents water droplets from entering the rotary machine from a bearing part by discharging the water to the outside.

The present invention will be specifically explained below with reference to an embodiment shown in FIG.

In the figure, 11 is a completely enclosed external fan-shaped waterproof rotary machine,
This rotating machine 11 is composed of a freely rotatable rotor and a stator surrounding the rotor. A rotating shaft 12 is provided at the center of the rotor, and this rotating shaft is supported by bearings 15 provided on brackets 14 attached to both axial ends of the stator jacket 13. . The shaft end of the rotating shaft 12 projects outside the bracket 14, and an external fan 16 is attached thereto. An annular drainage plate 17 is provided on the back side of the external fan 16 on the bracket 14 side. This draining plate 17 is inclined such that its upper edge faces the periphery of the outer fan 16.
On the other hand, a drain plate 17 is provided on the end surface of the bracket 14.
A water receiving portion 21 having a gutter-shaped circumferential section is provided in a circumferential manner opposite to the water receiving portion 21 .

The periphery of the outer fan 16 is covered by a cylindrical outer fan cover 18 that is secured to the outer sheath 13 of the stator with screws or the like. This outer fan cover 18
A ventilation duct 19 is formed between and the outer cover 13. A wire mesh 20 is stretched over the end surface of the outer fan cover 18 so as to surround the rotating shaft 12, and serves as an opening for drawing outside air.

Next, the operation of this embodiment will be explained.

When the rotating machine 11 is rotated, the external fan 16 directly connected to the rotating shaft 12 also rotates, and the outside air is passed through the wire mesh 20.
through it and pull it into the outer fan cover 18. At this time,
The outside air contains many small water droplets, which are splashed by the rotating outer fan fan 16, collide with the inner wall surface of the outer fan cover 18, and fall onto the drain plate 17. However, since the draining plate 17 is also rotating together with the outer fan 16, the water droplets are splashed away and collide with the inner wall surface of the outer fan cover 18 again, and then run along the bracket 14 into a gutter-shaped water receiving section. Fall to 21. Water droplets accumulated in the grooves of the water receiving portion 21 are discharged to the outside from the lower side of the rotating machine 11 along the grooves. Note that some of the water droplets pass through the ventilation duct 19 and are discharged to the outside.

As described above, according to the waterproofing mechanism of the totally enclosed external fan type waterproof rotating machine of the present invention, an annular draining plate with the tip facing toward the outer circumferential side of the fan is provided on the surface of the external fan facing the rotating machine bracket. At the same time, the bracket of the rotating machine is provided with a gutter-shaped water receiving part in a circumferential manner opposite to the draining plate, and this drains water droplets that have entered the cover to the outside, so that the rotating machine can be removed from the bearing part. Water droplets will not get inside. Therefore, there is no need to use a complicated waterproof bearing mechanism for the bearing part as in conventional types, reducing manufacturing costs.
It becomes possible to reduce the weight. Furthermore, since the bearing structure is simple, there is also the advantage that maintenance and inspection of the rotating machine can be carried out easily.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a conventional fully enclosed external fan type waterproof rotary machine, and FIG. 2 is a partial cross-sectional view of a rotary machine according to an embodiment of the present invention. 11...Rotating machine, 12...Rotating shaft, 13...Outer cover, 14...Bracket, 15...Bearing portion, 16
...Outer fan fan, 17... Draining board, 18... Outer fan cover, 19... Ventilation duct, 20... Wire mesh, 2
1...Water receiving part.

Claims (1)

[Scope of utility model registration request] An annular draining plate with a tip facing toward the outer circumferential side of the fan is provided on the surface of the external fan of the completely enclosed external fan type waterproof rotating machine facing the rotating machine bracket, and the rotating machine bracket is provided with a ring-shaped draining plate facing the rotating machine bracket. A waterproofing mechanism for a completely enclosed external fan-shaped waterproof rotary machine characterized by having a gutter-like water receiving part provided in a circumferential manner.