JPS5840759Y2 - Water draining device for rotating electrical machines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water draining device for draining water that has entered the rotating electric machine for a vehicle during rain.

A rotating electric machine such as a main electric motor installed in a vehicle is generally cooled by a self-ventilating fan, so that the inside of the machine is under negative pressure.

For this reason, rainwater and the like easily enter the inside of the machine through the filter of the fan intake port, and when this rainwater accumulates, problems such as deterioration of insulation and leakage of charging parts occur.

As a countermeasure to this problem, drain holes are provided in parts of the machine where water tends to accumulate, such as the lower inspection cover, but since the pressure inside the machine becomes negative during operation, rainwater may be sucked in through the drain holes and have the opposite effect.

Therefore, it has been proposed in the past that a valve mechanism is provided in the above-mentioned drain hole.

FIG. 1 shows an example of this, in which a frame 13 having a drain hole 12 is attached to the lower part of the lower inspection cover 11 together with a catch 15 using rivets 14, and a spherical valve 1 is mounted between the frame 13 and the catch 15.
Put 6.

The effect of this is that during operation, the negative pressure inside the machine draws the spherical valve 16 from position a shown by the solid line to position b shown by the two-dot chain line, thereby closing the drain hole 12 and preventing rainwater from being sucked in.

Then, when the operation is stopped, the negative pressure is eliminated, so the spherical valve 16 falls to position a due to its own weight, opens the drain hole 12, and drains the rainwater inside.

However, with this method, if the negative pressure inside the machine is not high, there is a risk that the operation will become uncertain due to vibrations and dust adhesion during b1 operation, which is performed with the spherical valve 16 not suctioning up and the drain hole 12 open. Ta.

Furthermore, in such a mechanism, since the drain hole 12 is located at a high position as shown in the figure, water remains inside the machine and it is impossible to drain it completely.

FIG. 2 shows an improved example of FIG. 1, in which a flat plate-shaped frame 17 with a drain hole 12 is attached to the lower part of the lower inspection cover 11 together with a catch 18 using rivets 14, and a spherical frame 17 is attached between the frame 17 and the catch 18. A valve 16 is inserted, and its function is the same as that in FIG.

In this example, the problem of water remaining inside the machine has been solved, but since the catch 18 protrudes outside the lower inspection cover 11, the catch 18 is not suitable for use in vehicles where the size of the main motor is strictly limited. Since this exceeds the limit for vehicles, a major disadvantage arises in that the raw electric motor must be made smaller accordingly.

The present invention eliminates these drawbacks, and its purpose is to create a shape that can operate satisfactorily even when the negative pressure inside the machine is low, is not affected by vibration or dust during operation, and does not protrude outside the machine. To provide a water draining device for a rotating electric machine that enables complete water draining.

The details of the present invention will be explained below with reference to FIGS. 3 and 4, which are one embodiment.

A rectangular water discharge hole 21 is provided at the bottom of the lower inspection cover 11, and a box-shaped frame 22 with an open bottom is attached with rivets 14 so as to cover this discharge hole 21 from above, that is, from inside the machine. Installation.

A drain hole 23 is provided at the lower part of the inclined side surface of the frame 22, and an opening/closing plate that is always rotated downward by its own weight and covers the drain hole 23 from the inside of the frame 22. 24 is attached to the inside of the frame 22 with a pin 25.

Therefore, the opening/closing plate 24 is always rotated and biased in one direction due to its own weight to close the drain hole 23.

Next, to explain the operation of the present invention, the operating opening/closing plate 2
4 is drawn to position d by its own weight and the negative pressure of a self-ventilating fan (not shown), completely closing the drain hole 23,
This prevents rainwater and the like from entering through the drain hole 22.

When the operation is stopped, the negative pressure inside the machine is eliminated. In this case, if rainwater has accumulated, the opening/closing plate 24 will be pushed up in the direction of the arrow e, opening the drain hole 23 and allowing the rainwater to flow outside through the drain hole 21. It is discharged.

In this case, even if the amount of rainwater, etc. is small and does not reach the force pushing up the opening/closing plate 24, the force in the direction of the arrow e on the opening/closing plate 240 is only its own weight, so the pressing force on the frame 22 is small, so the rainwater, etc. It will not flow out through the gap between the opening/closing plate 24 and the frame 22 and remain inside the machine.

Since the water draining device for a rotating electrical machine according to the present invention is constructed as described above, the water drain hole 23 is located at the lowest part of the lower inspection cover 11, and rainwater etc. inside the machine can be completely drained. It is.

Further, the closing action of the opening/closing plate 24 is performed by adding force due to its own weight to the negative pressure inside the machine, so that a sufficient closing action is performed even when the negative pressure is low.

Further, since the shape does not protrude outward from the lower inspection cover 11 at all, there is no problem even if a water drain device is provided even in the case of a main electric motor with severe vehicle limitations.

Furthermore, even if the operation is stopped for a long period of time, the drain hole 23 is
This invention has many advantages, such as preventing dust from entering the inside of the machine since the door is closed by a door.

[Brief explanation of the drawing]

1 and 2 are sectional views of a conventional example of a different type, FIGS. 3 and 4 show an embodiment of the present invention, FIG. 3 is a sectional view, and FIG. 4 is a plan view. 11... Lower inspection cover 21... Discharge hole, 22.
...Frame, 23...Drain hole, 24...Opening/closing plate, 25.
··pin.

Claims (1)

[Scope of utility model registration request] a lower inspection cover that is attached to a rotating electrical machine for a vehicle and has a water drain hole at the bottom; a frame that is shaped like a box with an open bottom and is attached to the upper part of the drain hole and has a drain hole with one side thereof opened at the bottom; A water draining device for a rotating electric machine which is rotatably supported on a pin inside the frame and is always rotatably biased towards the drain hole due to its own weight.