JPS5928818B2 - 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 shack using a fan motor.

As a method of automatically opening the shutter when the ventilation fan is operating,
There are methods to open the shack using the wind pressure of a fan, or a method to use a small motor with a slit in place of the fan motor, but methods that open the shack using wind pressure are difficult to open because the shutter is dirty with oil dust, etc. The method of using a small motor has the disadvantage of high cost.

In order 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 shutter, 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. This had the disadvantage that the clutch mechanism and gear mechanism were extremely complicated.

The present invention rotates the fan and simultaneously opens the shutter using a motor in which the rotor and iron core rotate together, and eliminates the need to disconnect the motor from the shutter even when the shutter is fully opened. Old soldier ζ,
The structure is simplified by preventing the iron core from repeatedly rotating due to the movement of the shack that swings under wind pressure.

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 elastically bias the shutters 4, 4.4 in the closing direction. A lever interlocking plate 5 is connected to the fan motor 3.

The drawstring 8 is bent at a suitable point in the distance extending from the buffer spring 7 to the fan motor 3 in a direction away from the spring 7, thereby forming a bent portion 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 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.

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

Reference numeral 20 denotes an iron core having a winding 21, which is rotatably attached to the cylindrical portion 11g via a bearing metal 22 press-fitted into the iron 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 around the reduction gear 26 and pulled under the interlocking plate 5 to open the shutter 4.

A slip ring 27.27 for receiving power is provided inside the cylindrical gear 23, and a contact point 29. The winding 2 of the iron core is brought into sliding contact with the
I am trying to supply power to 1.

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 them, the first reduction gear 25 in particular 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, so that the cylindrical gear 23 is engaged with the lever 34.

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 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 shacks 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 prevents the drawstring 8 from moving any further, so that 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.

The force keeping the drawstring 8 wound up is therefore gone, 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 applies not only to the rotor 18 of the motor, but also to the rotor 18 of the motor.
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 close the shutter 4, and since the iron core 20 is held in a locked state when the shutter is fully opened and the pull string 8 etc. for opening and closing the shutter is fixed, it is not necessary to use the conventional method. When the shutter is fully open, remove the clutch and disconnect the fan motor from the shutter, or
There is no need for a special engagement device or the like to hold the coil in the wound state, and the structure can be simplified.

Furthermore, a buffer spring 7 is provided and a flexible portion 8' is provided on the drawstring 8.
Therefore, even if the shutter 4 swings in the opening/closing direction due to external wind pressure or uneven wind pressure of the exhaust flow from the blower fan 2 when the shutter 4 is opened, it is buffered by the spring 7 and the bending portion 8', and is not moved directly to the iron core 20. Therefore, stable rotation of the blower fan 2 can be maintained without causing the iron core 20, which has a small rotational torque, to repeatedly rotate in the direction of the return force and the direction of rotation.

[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, 2...Blower fan, 4...
····Shutter.

Claims (1)

[Claims] 1. A rotor of a motor and an iron core having windings are each rotatably supported on a main body, and a blower fan is installed on the rotor, and one end of a drawstring is connected to the iron core so that the rotation of the iron core is supported. A ventilation fan characterized in that the drawstring is connected in a winding relationship by force, and the other end of the drawstring is connected to an interlocking plate for operating the shack via a buffer spring, and is bent in a direction away from the spring.