JPS6166039A - Vent duct switching device of ventilation fan - Google Patents

Abstract

PURPOSE:To obtain a ventilation fan having a compact construction with a quick response being fabricated at an inexpensive cost and also having a remote- controllable vent duct switching mechanism and an air flow deflection function by using a vent damper driving element formed by a memory alloy and an air flow deflecting element. CONSTITUTION:At the time of stopping the operation of the device, a vent damper 1 shields a vent duct 2 by the dead weight thereof and a bias spring 3. When a power source is turned ON and a ventilation fan is operated, a current is applied from a drive control circuit 19 connected to both ends of a vent damper drive element 18, and power is supplied to the inner part of a vent damper drive element 18. Upon this occasion, an actuating spring 8 contained in the vent damper drive element 18 generates heat itself, and overcome a moment due to the bias spring 3 and the dead weight of the vent damper 1 and contracts to pull down a connecting rod 13. For this reason, the ventilation damper 1 opens the vent duct 2. Further, during a fine weather time, a current is applied to the air flow direction deflecting element 20, while an air flow deflection plate 21 is directed upwardly.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention relates to a ventilation duct opening/closing device for a ventilation fan having a built-in drive spring made of a shape memory alloy.

Conventional configuration and its problems Traditionally, the ventilation damper used in ventilation fans was opened and closed by using the force of pulling the cord of the power switch attached to the ventilation fan, as shown in Figure 3, for example. A simple method is often used in which the power supply is turned on and off and the ventilation damper is opened and closed at the same time.

In this conventional example, the ventilation damper 1 is installed in the exhaust duct 2 of the ventilation fan main body, and can be shielded to prevent wind and rain from entering from outside when the fan is stopped. Normally, when stopped, the ventilation duct 2 is in a closed state due to the moment force due to the ventilation damper 1's own weight and the tensile force due to the elasticity of the bias spring 3 attached to the handle 4 of the ventilation damper 1.

To operate the ventilation fan, pull the string 5 downward to turn on the power. When the string 5 is pulled, the pull switch 6 is turned on and the ventilation fan (not shown) starts rotating. At the same time, the connecting rod 7 connected to the string 5 pulls the handle 4 of the ventilation damper 1, opens the ventilation duct 2, and starts ventilation of the room.

However, according to such a conventional example, it is not necessary to turn on the power by pulling the cord 5 every time the operation is started, which not only limits the installation position of the ventilation fan to within the reach of the user, but also causes the generation of smoke from stoves, etc. Since the ventilator is installed above a place where there is open flame, you will have to reach over the stove to turn the ventilation fan on and off, so be careful not to ignite your sleeves or other clothing. There were also problems with the safety of use, such as not being able to do so. Furthermore, if a ventilation fan is installed facing a busy street, the smoke and oil-laden air swept out by the ventilation fan may be blown into the faces of passersby, which is harmful to public health. , an inconvenience occurred.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and has a simple structure, quick response, low cost, remote-controlled automatic ventilation duct opening/closing mechanism, and wind direction deflection function. The purpose is to provide

Structure of the Invention In order to achieve the above objectives, the present invention provides a ventilation damper drive element having a built-in drive spring made of a shape memory alloy, and a wind deflection element having the drive spring built-in, in a ventilation duct. In the ventilation fan, the ventilation fan is provided with the ventilation duct that opens and closes and deflects the wind direction by the operation of the ventilation damper and the wind direction deflection plate, and a control circuit that controls energization to the ventilation damper driving element and the wind direction deflection element. By using a ventilation damper drive element and a wind direction deflection element made of a shape memory alloy to operate the wind direction deflection plate, the opening/closing of the ventilation duct and the deflection of the wind direction are automatically performed by a remote control he. By adding the function of a self-heating element with electrical resistance to the memory alloy itself, electricity is applied directly to the ventilation damper drive element and the wind direction deflection element, and the shape memory effect due to thermal deformation caused by this self-heating is utilized. The ventilation damper drive element and the wind direction deflection element are respectively actuated to drive the ventilation damper and the wind direction deflection plate to open and close the ventilation duct and deflect the wind direction.

Description of examples Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows the structure of the ventilation damper drive element.

In the figure, reference numeral 8 is made of a shape memory alloy, and is housed in a main body cylinder 10 whose inner wall is wrapped with insulating paper 9 having a smooth surface.
2 and a connecting rod 13 supported so as to be freely displaceable in the longitudinal direction. A safety spring 16 is attached around the main body tube 10 so as to wrap around the intangible tube 10, and the safety spring 16 is connected to an insulating support plate 12 at both ends and a support plate 15 having an insulating disc 14 attached to the upper surface. There is. A terminal hole 1 is provided at the tip of the connecting rod 13.
A control circuit (not shown) for controlling energization of the drive spring 8 is connected to both ends of the support plate 15 and the terminal hole 17 . Note that between the terminal hole 17 and the support plate 15 there are a connecting rod 13, a drive spring 8, a support fixing plate 11, and a main body cylinder 1.
0 and the safety spring 16 are electrically connected to each other so as to be energized in order, and are completely insulated from other parts.

Here, the shape memory alloy used for the drive spring 8 is, for example, an N L-Ti alloy, which undergoes martensitic transformation below an arbitrary set temperature of approximately 50°C to 70°C, and in this state, When an object that has been deformed due to an external force is energized, the shape memory alloy itself generates heat, and when the temperature rises above the martensitic transformation temperature, it returns to the original shape it had before being deformed by the external force. The drive spring 8 is made of a shaped memory alloy that exhibits unidirectional movement due to temperature changes. This shape change temperature range can be adjusted by changing the composition of the shape memory alloy or heat treatment.

FIG. 1 is a partially enlarged view of a ventilation fan equipped with the ventilation damper driving element.

In the figure, when stopped, the ventilation damper 1 uses the moment force due to its own weight and the bias spring 3 connected to the handle 4 of the ventilation damper 1 to shield the ventilation duct 2 and prevent wind and rain from entering from outside.

When the power is turned on and the ventilation fan is operated, a current is applied from the drive control circuit 19 connected to both ends of the ventilation damper drive element 18, and the inside of the ventilation damper drive element 18 is energized. At this time, the drive spring 8 built into the ventilation damper 1 drive element 18 generates heat by itself due to its own electric resistance, becomes high temperature, and changes to the preset shape due to the shape memory effect of the drive spring 8. , overcomes the moment force due to the weight of the bias spring 3 and ventilation damper 1 and contracts, pulling down the connecting rod 13. Therefore, the handle 4 connected to the connecting rod 13 is also pulled down, and the ventilation damper 1 opens the ventilation duct 2.

Further, the control circuit 19 determines a signal from a raindrop sensitive sensor (not shown) depending on the outdoor weather, and when the weather is clear, a current is also applied to the wind deflection element 2o to direct the wind deflection plate 21 upward. .

On the other hand, when the ventilation fan is turned off, the ventilation damper drive element 1
Since the current flowing across both ends of the drive spring 8 is also cut off, the drive spring 8
is rapidly cooled by the wind flowing through the ventilation duct 2, so that it changes again to martensitic transformation that is easily plastically deformed, and the restoring force due to the bias spring a and the weight of the ventilation damper 1 acts on the ventilation damper 1. The ventilation duct 2 is closed.

The shape memory alloy forming the drive spring used in this example has unidirectional deformation, but exhibits bidirectional behavior that repeats contraction and expansion at a certain temperature difference. The same effect can be obtained even in the case of In this case, there is no need for a bias spring to apply force to close the ventilation damper.

Effects of the Invention As is clear from the above embodiments, the ventilation fan of the present invention has the following effects, for example, by joining a ventilation damper drive element and a wind direction deflection element having a built-in drive spring made of a shape memory alloy to a ventilation damper. When ventilating a room facing a busy street, on sunny days, raise the direction of the ventilation fan to prevent filthy air containing smoke and oil droplets from blowing directly into the faces of people passing by on the street. On the other hand, during rainy weather, the wind deflection plate is deflected downward to prevent rainwater from entering indoors.Furthermore, by automating the opening and closing of ventilation ducts, ventilation can be achieved at low cost and with a simple structure. The duct is what you get. Moreover, since current flows directly through the drive spring, it has good thermal response characteristics, reduces heat loss, and has the advantage of being able to operate quickly with a small amount of current.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a ventilation fan showing one embodiment of the present invention;
The figure is an exploded perspective view of a drive element used in the ventilation fan, and FIG. 3 is a sectional view of a conventional ventilation fan. 1...Ventilation damper 1.2...Ventilation duct, 18...Ventilation damper drive element, 19...
... Control circuit, 20 ... Wind direction deflection element, 21
・・・・・・Wind deflection plate. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A ventilation damper drive element having a built-in drive spring made of a shape memory alloy, a wind direction deflection element having the drive spring built in, a ventilation damper connected to the ventilation damper drive element, and the wind direction deflection element in the ventilation duct. a wind direction deflection plate connected to the ventilation duct, the ventilation duct which opens and closes the flow path and deflects the wind direction by displacement of the ventilation damper and the wind direction deflection plate, and controls energization to the ventilation damper drive element and the wind direction deflection element. A ventilation duct opening/closing device for a ventilation fan equipped with a control circuit.