JPS5928817B2 - 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. This had the disadvantage that the clutch mechanism and gear mechanism were extremely complicated.

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

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 hold the shutters 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 rear directions with washers 17 and 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.

Reference numeral 20 denotes an inner core having a winding 21, which is rotatably attached to the cylindrical portion 11 via a bearing metal 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 drawstring 8 is wound up by the reduction gear 26, and the interlocking plate 5 is pulled down to open the shack 4.

A slip ring 27.27 for power reception is provided inside the cylindrical gear 23, and contacts 29, 29 protrude from the terminal board 28 fixed to the cylindrical portion 11 to connect the slip ring 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 an IJ-do wire drawn out from the terminal board 28.

On the other hand, the first and second reduction gears 25, 26 are rotatably attached to a support plate 31, 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 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 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, 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 up the drawstring 8, pull down the interlocking plate 5, and open the shutters 4, 4.4.

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 core 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.

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 shutter 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 shutter 4, 4.4 can be closed.

As described above, the present invention enables not only the outer rotor 18 of the motor but also the inner core 20 having the winding 21 to rotate, and at the same time, the outer rotor 18 rotates the blower fan 2 and the inner core 20 rotates. Since the shutter can be opened by a single fan motor 3, the blower fan 2 can be rotated and the shutter 4 can be opened and closed by a single fan motor 3, which is economical, and the inner core 20 can be held in a locked state when the shutter is fully opened. Since the pull string 8 and other parts for opening and closing the shutter are fixed in place, the clutch can be removed to disconnect the fan motor and the shutter when the shutter is fully opened, or the pull string 8 can be kept in a wound state. This eliminates the need for a special engagement device, etc. for holding the device, and the structure can be simplified.

Furthermore, since the blower fan 2 is rotated by the outer rotor 18 and the shutter is opened by the rotation of the inner core 20, the motor 3 can be made thinner and smaller, and the shutter opening/closing mechanism can be simplified.

[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 is a longitudinal sectional view of main parts showing another embodiment. 18...Outer rotor, 21...Winding,
20...Inner core, 2...Blower fan, 4...Shutter.

Claims (1)

[Claims] 1. An outer rotor of a motor is rotatably attached to an inner core having an upper winding, and the outer rotor rotates a blower fan, and the shutter is opened by the rotational force of the inner core, and when fully opened, the inner core A ventilation fan whose iron core is held in a locked state.