JPS5928820B2 - Shutter opening/closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to simplify the structure of a device that opens and closes a shutter using a fan motor, such as a ventilation fan.

As a method of automatically opening the shutter when the ventilation fan is operating,
There are methods to open the shutter using the wind pressure of a fan, or to use a small motor with a slit 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 shack, but when the shutter is fully opened, it is necessary to break the connection between the fan motor and the drawstring and fix the drawstring at the same time. This had the disadvantage that the clutch mechanism and gear mechanism were extremely complicated.

The present invention uses a motor whose rotor and iron core 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. The structure is 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 facing the 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 accommodate an oil-impregnated felt 15 and a bearing medal 16.
This bearing medal is rotatably fitted onto the metal rod 12, and the washers 17, 17 prevent movement in the front-rear force 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 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.

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

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 wound up by the reduction gear 26, and the interlocking plate 5 is pulled down to open the shutter 4.

Slip rings 27, 27 for power reception are provided inside the cylindrical gear 23, and contacts 29, 29 are protruded from the terminal board 28 fixed to the cylindrical portion 11 to connect the slip rings 27, 27. 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.

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 power is supplied to the winding 21, the blade is pushed down by the lever 34 and moves to the lower blade, 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 core 20 is also rotatably attached to the central fixed shaft 13, the inner core 20 rotates in the direction opposite to that of 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, the rotation of the inner core 20 is transmitted to the first reduction gear 25 via the cylindrical gear 23, and further to the second reduction gear 26.
is transmitted to wind the drawstring 8, pull down the interlocking plate 5, and open the shutter 4°4.4.

When the pull string 8 is pulled until the shutter is fully open,
The tightening pad 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 core 20 is held in a locked state.

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

As a result, 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 closes the shutters 4.4, 4.

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, in the present invention, not only the rotor of the motor but also the iron core having the windings can be rotated, and the rotor can rotate the blower fan, and at the same time, the iron core can open the shutter. It is economical because a single fan motor can rotate the blower fan and open and close the shutter.

Furthermore, since the rotor and the core are each rotatably mounted on the central fixed shaft via a bearing metal, etc., it is easy to adjust the mutual positional relationship between the rotor and the core during production work, etc.
In addition, since the central fixed shaft is fixed in a fixed position, the positional relationship between the rotor and the iron core can be maintained substantially constant during long-term use, and will not shift due to wear of the rotating shaft or due to vibrations, shakes, etc.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a ventilation fan equipped with the device of the present invention;
The figure is a longitudinal cross-sectional view of a fan motor, and FIG. 3 is a longitudinal cross-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 rotor of a motor and an iron core having windings are rotatably attached to a central fixed shaft protruding from the main body via bearing meshes, etc., and the shutter is controlled to open and close by the rotational force of the iron core. Features a shutter opening/closing device.