JPS5916557Y2 - Fan - Google Patents

Description

[Detailed explanation of the idea] [Field of application of invention] The present invention relates to improvements in electric fans.

[Background of the invention] In many conventional electric fans, an open-type electric motor is covered with an open-type insulating jacket.

By making it an open type, the wind generated by the rotation of the fan is sucked into the motor, and the heat generated from the windings is effectively dissipated, increasing the cooling effect, reducing the size of the motor, and making it possible to By forming the cover with an insulating material, the purpose is to protect the human body from high-temperature metal parts that pose a risk of electric shock or burns due to poor insulation of the motor.

However, in such electric fans, a large amount of dust in the air enters the inside of the electric motor, resulting in significant deterioration of the insulation of the windings.

If the insulation of the windings deteriorates, there is a danger that sparks from short circuits will easily ignite dust and cause a flame.

In order to improve fire resistance, the problem can be solved by constructing the housing with a sealed metal container, but simply using a metal housing will reduce the cooling performance and cause the motor performance to decrease due to temperature rise. .

Therefore, in order to maintain a predetermined performance, the electric motor becomes large in size.

[Purpose of invention]

The present invention has been made with attention to the above points, and its purpose is to further improve fire resistance by increasing cooling performance in a motor using a closed type electric motor having a metal housing. The purpose is to prevent the performance of the motor from deteriorating due to heat and to reduce the size of the motor as much as possible.

[Summary of the idea]

In this invention, a metal plate with a diameter larger than that of the housing and having multiple ventilation holes on the outer periphery is fixed to the tip of a sealed metal housing, and a fixing protrusion, nut, and guard ring with a smaller diameter than the metal plate are fixed to the tip of the closed metal housing. A rear guard is attached, and the electric motor and metal plate are wrapped in an open synthetic resin type cover.

[Example of idea]

Next, an embodiment of the present invention will be described with reference to the drawings.

1 is an electric motor with a sealed metal housing and a support shaft 2
It is provided on the neck 3 so as to be freely rotatable in the horizontal direction.

Reference numeral 4 denotes a support that supports the neck 3 so as to be able to move up and down.

Reference numeral 5 denotes a speed reduction mechanism provided on the rear surface of the electric motor 1, and a pedestal 6 is provided on the rear surface of this speed reduction mechanism 5.

Reference numeral 7 denotes a rod that connects the output shaft 8 of the speed reduction mechanism 5 and the pin 9 of the neck 3, and reciprocates the electric motor 1 by a predetermined angle in the horizontal direction as the electric motor 1 rotates.

Reference numeral 10 denotes a metal plate fixed to the front surface of the electric motor 1. The metal plate 10 has a larger diameter than the electric motor 1, and an exhaust portion 11 is formed outwardly from the electric motor 1.

A synthetic resin cover 12 is inserted from the rear of the electric motor 1 and covers the electric motor 1 and the metal plate 10.

Further, this cover 12 is attached with screws 22 as shown.

Reference numeral 13 denotes an intake port formed on the rear surface of the cover 12.

14 is a rotating shaft passing through the metal plate 10, and a fan 15 is attached to the tip thereof.

16 is the boss of fan 15.

17 is an insulating support stand provided on the metal plate 10;
This support stand 17 has a guard ring 1 of this guard 18.
9 is fitted, and this guard ring 19 is fixed with a nut 20.

The support base 17, the guard ring 19, and the nut 20 each have a diameter smaller than that of the metal plate 10, and are configured so as not to block the exhaust section 11.

In the above configuration, when the fan 15 is rotated at high speed by the electric motor 1, the wind flows at high speed as shown by B, and this wind flows from the intake port 13 on the rear surface of the cover 12 through the arrows E, F, and G.
The wind flows like this.

This air cools the motor 1 by coming into contact with the metal housing surface of the motor 1.

[Effect of idea]

As explained above, according to the present invention, an electric motor has a closed metal housing, a metal plate having a larger diameter than the electric motor is provided on the front end face of the electric motor, an exhaust port is provided on the outer periphery of this metal plate, and , the guard is attached using a guard ring, a support stand, and a nut having a diameter smaller than that of the metal plate;
Moreover, since the electric motor is covered with a synthetic resin cover with an air intake port on the rear side, the fully enclosed metal housing and cooling effect prevent dust from entering the electric motor, making it fireproof. Furthermore, since the performance of the motor does not deteriorate due to heat, the motor can be made as small as possible.

[Brief explanation of drawings]

The drawing is a sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Electric motor, 10... Metal plate, 11... Exhaust port, 15... Fan, 16... Fan boss, 17...
・Support stand, 19... Guard ring, 20... Nut.

Claims (1)

[Claim for Utility Model Registration] In an electric fan in which the fan is rotated by an electric motor having a sealed metal housing, a metal plate having a diameter larger than that of the electric motor is fixed to the front of the electric motor, and the outer diameter of the metal plate is larger than the outer diameter of the electric motor. A plurality of exhaust ports are formed on the outer part of the metal plate, a synthetic resin type cover is provided that surrounds the metal plate and the electric motor, and has an intake port on the rear surface, and a synthetic resin type support is provided on the metal plate. An electric fan, characterized in that a guard ring is attached to the support base by a nut, and the support base, the nut, and the guard ring have a diameter smaller than that of the metal plate.