JPH079574Y2 - Waterproof structure of fan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a waterproof structure of a fan motor for general industry, electrical equipment, etc.

2. Description of the Related Art In recent years, there has been a demand for improved waterproofness of motors for general industry and electrical equipment.

Hereinafter, the waterproof structure of the conventional fan motor described above will be described with reference to the drawings.

FIG. 3 shows a waterproof structure of a conventional fan motor. The output-side bracket 1 and the counter-output-side bracket 2 are joined together via a sealing material. The counter output side bracket 2 and the brush holder 3 are joined via a sealing material.
The lead wire 5 is led out from the brush holder 3 via a sealing material. The ball bearing 7 on the output side has a contact type seal plate facing the outside of the motor, and an O-ring 6 is attached to the outer ring to eliminate the clearance of the ball bearing portion.

However, in the structure as described above, since the motor part has a close-open structure, a sudden change in the internal pressure of the motor due to heat generation and rapid cooling of the motor causes water to flow from the minute pinhole in the seal part. In addition to the risk of penetration, there is a problem that the cost is high because the O-ring is used for the bearing outer ring, the accuracy of the O-ring contact area is maintained, and the workability when inserting the bearing into the bracket is poor. .

The present invention solves the above problems and provides a waterproof structure for a fan motor that is inexpensive and highly reliable against water.

Means for Solving the Problems In order to solve the above problems, a fan motor of the present invention comprises an output side bracket having a breathing hole in a waterproof cap mounting groove,
Attach a waterproof cap with a drain hole on the outer peripheral side and a drain groove in a part of the output shaft penetrating opening so as to cover the breathing hole of the output side bracket, and the waterproof cap mounting groove of the output side bracket A space is formed between the caps.

The present invention has the above-described structure, and can keep the pressure inside the motor constant in the bracket breathing hole and the outside air and prevent the intrusion of water from the bracket breathing hole by the waterproof cap. Also, by attaching a waterproof cap, the motor sound expands due to the megaphone effect of the output shaft penetrating opening of the waterproof cap, but the output shaft penetrates the passage where sound is output from the space formed by the output side bracket groove and the waterproof cap. It is possible to prevent the sound from leaking to the outside from the entire output shaft penetrating opening and limit the expansion of the motor sound by limiting the water drain groove of the opening for water.

Embodiment A waterproof structure for a fan motor according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a waterproof structure of a fan motor according to an embodiment of the present invention, and FIG. 2 is a front view and a lateral sectional view of a waterproof cap. The same parts as the conventional products are given the same numbers.

The output side bracket 1 and the counter output side bracket 2 are joined at the outer peripheral portion end surface via a sealing material, and the counter output side bracket 2 and the brush holder 3 are joined at the outer peripheral portion end surface via a sealing material. Lead wire 5 is brush holder 3
It is exposed to the outside through the sealing material.

The output side bracket 1 is provided with a breathing hole 1a,
The change in pressure inside the motor is suppressed against sudden changes in temperature inside the motor. Further, the waterproof cap 4 is attached to the output bracket 1 so as to cover the breathing hole 1a, and the waterproof cap of the output bracket is attached to the outer periphery of the waterproof cap so as to form a space between the waterproof cap 4 and the waterproof cap mounting groove of the output bracket 1. The bearing holding step portion 1b of the output side bracket is in contact with the mounting groove or the output shaft penetrating opening portion 4c of the waterproof cap. The waterproof cap 4 has a water drain hole 4a on the outer peripheral surface.
Also, the drainage groove 4b is provided in the opening 4c for penetrating the output shaft.

Therefore, in the case where water intrudes from the output shaft penetrating opening 4c of the waterproof cap 4 in a situation where the output shaft of the motor is horizontally arranged, the water is drained downward by the drain groove 4b arranged downward. The water is discharged to the outside through the drainage hole 4a, and water does not pass through the breathing hole 1a of the output side bracket 1 to enter the inside of the motor.

Further, with respect to the splash that has entered through the drainage hole 4a, since the coordinates where the drainage hole 4a and the breathing hole 1a of the output side bracket 1 are arranged are at a right angle, the breathing hole 1a of the output bracket 1 is described. Without passing through, the water is discharged to the outside through the water drain hole 4a to prevent water from entering the inside of the motor.

Also, in the situation where the output shaft of the motor is arranged downward,
Output from the drainage groove 4b of the waterproof cap 4 without passing through the breathing hole 1a of the output side bracket 1 under the same conditions as the above-mentioned horizontal arrangement for the splash that has entered through the drainage hole 4a of the waterproof cap 4. The water is discharged to the outside through the shaft penetrating opening 4c to prevent water from entering the inside of the motor.

The output shaft penetrating opening from the space formed by the waterproof cap mounting groove of the output side bracket 1 and the waterproof cap 4.
By limiting the passage through which the sound is emitted to the outside through 4c to the water drain groove 4b, it is possible to suppress the expansion of the motor sound due to the megaphone effect of the output shaft penetrating opening 4c that occurs when the waterproof cap 4 is attached.

As described above, according to the present invention, the output side bracket having the breathing hole, the water draining hole at the position perpendicular to the breathing hole and the water draining groove at the output shaft penetrating opening are further provided. By providing a waterproof cap attached to the output side bracket so as to cover the hole and limit the passage to the outside of the space formed between the brackets to the drain hole and drain groove, heat generation of the motor and rapid cooling by water Prevents changes in the motor pressure due to factors such as water entry, and prevents water from entering, and when the motor's output shaft is facing downward or horizontal, the waterproof cap protects against fountains from directly above. This prevents water from entering the breathing hole on the output side bracket, and suppresses the expansion of motor noise due to the megaphone effect of the waterproof cap, which is highly reliable for water ingress into the motor. It is possible to provide an inexpensive fan motor with a waterproof structure that produces low noise.

[Brief description of drawings]

FIG. 1 is a sectional view of a waterproof fan motor according to an embodiment of the present invention, FIG. 2 is a front view and a lateral sectional view of the waterproof cap of FIG. 1, and FIG. 3 is a conventional waterproof fan motor. FIG. 1 ... Output side bracket, 1a ... Breathing hole, 1b ... Bearing holding step, 2 ... Anti-output side bracket, 3 ... Brush holder, 4 ... Waterproof cap, 4a ... Drain hole, 4b ......
Drainage groove, 5 ... Lead wire, 6 ... O-ring.

Claims (1)

[Scope of utility model registration request] 1. A waterproof fan motor in which an axial fan is fixed to an output shaft, and the output shaft faces downward or the output shaft is horizontally arranged. A bearing holding step portion, a waterproof cap mounting groove, and the groove portion are breathed. The output side bracket provided with a hole, the breathing hole position and the outer peripheral side surface at the position orthogonal to the coordinates are provided with a drainage hole, an output shaft penetrating opening, and a drainage groove in a part of the opening. The outer peripheral part is inserted into the waterproof cap mounting groove of the output bracket so as to cover the breathing hole and form a space between the output brackets, and the output shaft penetrating opening contacts the bearing holding step of the output side bracket. Fan motor waterproof structure with a waterproof cap attached as in.