JPS5925929B2 - ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilation fan that automatically opens and closes a shutter by stopping a fan motor.

Automatically open the shutter when the ventilation fan is running (as a method,
There are methods to use the wind pressure of a fan, or to use a small motor (separate from a fan motor). The method of using a separate small motor has the drawback of increasing cost.

In order to solve this problem, there are devices that use a fan motor to wind up a drawstring for opening and closing the shutter, such as those described in Japanese Patent Publication No. 45-15552 and Japanese Patent Publication No. 47-23466. .

However, when the shutter is fully opened, it is necessary to disconnect the fan motor and the drawstring and at the same time fix the drawstring, which has the disadvantage that the clutch mechanism and gear mechanism become extremely complex.

The present invention uses a motor in which a five-rotor and a stator rotate together to rotate the fan motor and open the shutter at the same time, and there is no need to interrupt the connection between the motor and the shutter even when the shutter is fully opened. In addition to simplifying the structure, the shutter can be opened smoothly even with a small torque of the stator.

The present invention will be described below with reference to the drawings. Reference numeral 1 denotes a ventilation fan, which faces the indoor opening and is equipped with a fan motor 3 for driving the ventilation fan 2, and which faces the outdoor opening and is equipped with shutters 4, 4.4. It is equipped with

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

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 central fixed shaft 13 is formed by integrally protruding a horizontal cylindrical portion 11 and press-fitting a metal rod 12 into the cylindrical portion.

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.
is press-fitted, and this bearing metal is rotatably fitted onto the metal rod 12.

Washers 17, 1°7 prevent movement in the front and back direction.

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 air blower 77 fan 2 is crimped onto the front bracket 14 so that the air blower fan 2 is rotated by the rotation of the outer rotor 18. .

Reference numeral 20 denotes an inner stator having a winding 21, which is rotatably attached to the cylindrical portion 11 via a bearing metal 22 press-fitted into the stator.

23 is a cylindrical gear attached to the inner stator 20;
Teeth 24 carved on the opening periphery of the cylindrical gear are meshed with the first reduction gear 25, and the second reduction gear 26 meshed with the first reduction gear 25 winds up the drawstring 8, lowering the interlocking plate 5. The shutter 4 is opened by pulling the shutter.

A slip ring 27, 27 for receiving power is provided inside the cylindrical gear 23, and a contact point 29. .27 to supply power to the winding 21 of the inner stator.

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 them, the first reduction gear 25 in particular is attached so as to be slidable in its axial direction, and is normally moved upward by a compression spring 32 and disengaged from the cylindrical gear 23. However, when the lever 34 is attracted by the electromagnet 33 which is energized at the same time as power is supplied to the winding 21, the lever 34K is pushed down and moves downward, so that it meshes 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 outer rotor 18 rotates, and the blower fan 2 is rotated.

However, since the inner stator 20 is also rotatably attached to the central fixed shaft 13, the inner stator 20 rotates in the opposite direction to the outer 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, 200 rotations of the inner stator are transmitted to the first reduction gear 25 via the cylindrical gear 23, and further to the second reduction gear 25.
6, the pull string 8 is wound up, the interlocking plate 5 is pulled down, and the shutters 4, 4.4 are opened.

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 8 from moving any further, so that the inner stator 20 is held in a locked state.

Therefore, in this state, only the outer rotor 18 rotates at a high speed, and indoor air is discharged.

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, the drawstring 8 is held in a wound state (since the force is removed, the interlocking plate 5 is pulled up by the tension spring 6 and the shutter 4.4.4 is closed).

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 applies not only to the rotor 18 of the motor, but also to the rotor 18 of the motor.
The stator 20 having the winding 21 is also rotatable, and the rotor 18 rotates the blower fan 2fzr: At the same time, the stator 20 can open the shutter. It is economical to rotate and open/close the shutter 4, and when the shutter is fully opened, the stator 20 is held in a locked state and the drawstring 8 etc. for opening/closing the shutter is fixed, which is different from the conventional method. In this way, when the shutter is fully opened, the clutch is removed to disconnect the fan motor and the shutter, and the drawstring 8 is held in a wound state (a special engagement device etc. for this purpose is no longer required). The structure can be simplified.

Further, since the rotational force of the stator 200 is transmitted to the gear to wind up the drawstring, effects such as the ability to smoothly open the shutter with a small torque of the stator 20 are achieved.

[Brief explanation of the drawing]

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 shows another embodiment. 18...Rotor, 21...Winding, 20
...Stator, 13... Center fixed shaft, 2
...Blower fan, 4...Shutter, 8
・-・・Pull cord, 23, 25, 26... Gear.

Claims (1)

[Claims] 1. A motor that rotatably supports a rotor and a stator on a main body, a gear that transmits the rotational reaction force of the stator against the rotor, and a pull cord and a shutter that is wound around the gear and that pulls and releases the shutter. A ventilation fan.