JPS5928819B2 - ventilation fan - Google Patents

Description

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

How to automatically open the shutter when the ventilation fan is running
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 small motors has the disadvantage of increasing cost.

To solve this problem, there is a system that uses a fan motor to wind up a drawstring for opening and closing the shutter to open the shack, but when the shack is fully opened, the connection between the fan motor and the drawstring needs to be broken and the drawstring needs to be fixed at the same time. However, this had the disadvantage that the clutch mechanism and gear mechanism were extremely complicated.

The present invention uses a motor in which the rotor and iron core rotate together to rotate the fan and open the shack at the same time, and there is no need to disconnect the motor and the shutter even when the shutter is fully opened. The structure is simplified and the power supply line will not be cut even if the pull cord is cut and the iron core does not stop rotating.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a ventilation fan, which is equipped with a blower fan 2 facing the indoor opening and a driving fan motor 3, and a shutter facing the outdoor opening. 4,4.4.

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 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.

Slip rings 27, 27 for receiving power are 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 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.

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.

The first reduction gear 25 is mounted so as to be slidable in its axial direction, and is normally moved upward by a compression spring 32 to disengage 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 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 rotation of the iron core 20 is 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 move the shutters 4, 4, . Open 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, and the drawstring 8 no longer moves, so the iron 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.

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, 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 shack, and when the shutter is fully opened, the inner iron core is held in a locked state to fix the drawstring etc. for opening and closing the shack. This eliminates the need for a special engagement device to remove the clutch and disconnect the fan motor from the shutter when the shutter is fully opened, or to hold the drawstring in a wound state, as was the case in the past, and the structure has been simplified. It can be done easily.

Furthermore, since power is supplied to the iron core through a slip ring to which the power supply contacts are slidably connected, even if the pull cord is broken due to deterioration or impact, the rotation of the iron core will not stop. If the power supply is continued and the power is supplied directly by the power lead wire, there is a risk that the lead wire will eventually break, but there is no such concern.

Therefore, the motor is not burnt out due to an accident caused by cutting the lead wire, and the motor cannot be reused, making it safe and economical.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional view of a ventilation fan of the present invention, FIG. 2 is a vertical cross-sectional view of a fan motor, and FIG. 3 is a vertical cross-sectional view of main parts showing another embodiment. 18...Outer rotor, 21...Winding,
20...Inner iron core, 13...Center fixed shaft, 2...Blower fan, 4...Shack.

Claims (1)

[Claims] 1. An iron core having a rotor upper winding is rotatably supported on the main body in a bracket, the rotor rotates a blower fan, the shutter is opened and closed by the rotational force of the iron core, and the iron core is A ventilation fan characterized in that a power supply contact is slidably connected to a power receiving slip ring provided therein.