JPS5928821B2 - ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to simplify the structure of a ventilation fan whose shutter is opened and closed by a fan motor.

As a method of automatically opening the shutter when the ventilation fan is operating,
There are methods to open the shutter using wind pressure from a fan, or to use a small motor with a stub in place of the fan motor. The method of using a small motor has the disadvantage of high cost.

In order to solve this problem, there are some shutters that use a fan motor to wind up a drawstring for opening and closing the shutter to open the shutter, but when the shutter is fully opened, the connection between the fan motor and the drawstring needs to be severed, and at the same time the drawstring needs to be fixed. However, the disadvantage was that the clutch mechanism and gear mechanism were extremely complicated.

The present invention allows the shutter to be opened at the same time as the fan motor is rotated by a motor in which the rotor and the iron core rotate together, and there is no need to interrupt the original connection between the motor and the shutter when the shutter is fully opened. The structure has been simplified.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a ventilation fan, which is provided with a fan motor 3 for driving a ventilation fan 2 at an indoor opening, and a shutter 4 facing the outdoor opening.
, 4, 4.

Reference numeral 5 denotes an interlocking plate connecting each shutter, and the interlocking plate is pulled up by a tension spring 6 to hold the shutter 4°4.4 in a closed state, and a buffer spring 7 and a drawstring 8
This interlocking plate 5 is connected to the fan motor 3 via.

This fan motor 3 is attached to a metal rear bracket 10 fixed to the ventilation fan main body 1 via support legs 9, 9.
A cylindrical portion 11 is integrally protruded from the cylindrical portion, and a metal rod 12 is press-fitted into the cylindrical portion to form a central fixed shaft 13.

Reference numeral 14 denotes a front bracket of the motor, which has a bifurcated inner peripheral edge to house an oil-impregnated felt 15, and a bearing metal 16.
This bearing metal is rotatably fitted onto the metal rod 12, and is prevented from moving in the front and back direction with wall sealers 17, 17.

Then, the outer rotor 18 of the motor is press-fitted into this front bracket 14, and this outer rotor is attached to the central fixed shaft 13.
The boss portion 19 of the blower fan 2 is crimped onto the front bracket 14 so that the blower fan 2 is rotated by the rotation of the outer rotor 18.

20 is an inner core having a winding 21, and the cylindrical portion 11 of the center fixed shaft 13 is connected to the inner core 20 through a bearing metal 22 press-fitted into the core.
It is rotatably mounted on the

Reference numeral 23 denotes a cylindrical gear attached to the inner core 20, and teeth 24 carved on the periphery of the opening of the cylindrical gear are connected to the first reduction gear 2.
5, and the second reduction gear 25 meshed with this first reduction gear 25.
The pull string 8 is pulled down on the winding device interlocking plate 5 by a reduction gear 26 to open the shutter 4.

Slip rings 27, 27 for power reception are provided inside the cylindrical gear 23, and contact points 29.degree. The coil 21 is brought into sliding contact with the coil 21 of the inner core so as to supply power to the winding 21 of the inner core.

30 is a lead wire pulled out from the terminal board 28.

On the other hand, the first and second reduction gears 25 and 26 are rotatably attached to support plates 31 and 31 attached to the rear bracket 10.

Among these, the first reduction gear 25 in particular is mounted so as to be slidable in its axial direction, and is normally moved upward by the compression spring 32 and disengaged from the cylindrical gear 23. When the lever 34 is attracted by the electromagnet 33 which is energized at the same time as the power is supplied to the winding 21, the lever 34 is pushed down and moves downward to mesh with the cylindrical gear 23.

In the above configuration, from the lead wire 30 to the contact point 29 of the terminal board
When alternating current is supplied to the winding 21 through the slip ring 27, a rotating magnetic field is generated, the rotor 18 rotates, and the blower fan 2 is rotated.

However, since the iron core 20 is also rotatably attached to the central fixed shaft 13, the iron core 20 rotates in the opposite direction to the rotor 18.

On the other hand, since the electromagnet 33 is also energized at the same time as power is supplied to the winding 21, the lever 34 is attracted, and the first reduction gear 25 is pushed down against the spring 32 and meshes with the cylindrical gear 23.

Therefore, the 200 revolutions of the iron core are transmitted to the first reduction gear 25 via the cylindrical gear 23, and further transmitted to the second reduction gear 26 to wind up the drawstring 8, pull down the interlocking plate 5, and shutter the shutters 4, 4, 4. to open.

When the pull string 8 is pulled until the shutter is fully open,
The stopper 35 attached to the drawstring hits the end of the tube 36 protecting the drawstring 8, preventing the drawstring from moving any further, so that the inner core 20 is held in a locked state.

Therefore, in this state, only the rotor 18 rotates at high speed,
Indoor air is exhausted.

When the power supply to the winding 21 is stopped in order to stop the ventilation operation, the blower fan 2 is stopped.

At this time, the power supply to the electromagnet 33 is also stopped, so the lever 3
4 moves upward by its own elasticity, and the first reduction gear 25
is pulled upward to disengage this gear and the cylindrical gear 23.

'Therefore, there is no longer any force holding the drawstring 8 in the wound state, so that the tension spring 6 pulls up the interlocking plate 5 and the shutters 4.4, 4 close.

FIG. 3 shows another embodiment, in which the second reduction gear 26 is omitted and the mechanism for disengaging the first reduction gear 25 and the cylindrical gear 23 is omitted.

In this embodiment, since the reduction ratio is small, as long as the current to the winding 21 is cut off, the cylindrical gear 23 and the first reduction gear 25
The drawstring 8 can be pulled back by the tension spring 6 without disengaging the shutter 4, 4, 4, and the shutters 4, 4, 4 can be closed.

As described above, the present invention is applicable not only to the rotor 18 of the motor, but also to
The iron core 20 having the winding 21 is also rotatable, and the rotor 18 rotates the blower fan 2, and at the same time the iron core 20 can open the shutter. It is economical to rotate and open and close the shutter 4, and when the shutter is fully opened, the iron core 20 is held in a locked state via a drawstring that abuts against a stopper and prevents its movement. This eliminates the need for a special engagement device to disconnect the fan motor and shutter by removing the clutch when the shutter is fully opened, or to hold the drawstring 8 in a wound state, simplifying the structure. can do.

Moreover, since the drawstring 8 is prevented from moving by contacting the stopper 35, the impact of contact with the stopper 35 is elastically relaxed, and impact noise is reduced.
It is possible to reduce the frequency of contact and separation of the drawstring 8 at 5.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the ventilation fan of the present invention, FIG. 2 is a longitudinal sectional view of the fan motor, and FIG. 3 is a longitudinal sectional view of main parts showing another embodiment. 18...Rotor, 21...Winding, 20
... Iron core, 13 ... Center fixed shaft, 2.
...Blower fan, 4...Shutter.

Claims (1)

[Claims] 1. A motor rotor and an iron core having windings are rotatably attached to the main body, and a blower fan is installed on the rotor, and a drawstring is wound by the rotational force of the iron core. A ventilation fan having a structure in which a shutter is operated to open and close, and further structured in such a manner that rotation of the iron core is prevented by a stopper that comes into contact with the drawstring when the shutter is fully opened.