JPS61289239A - Ventilating fan - Google Patents

Abstract

PURPOSE:To provide the prominent ventilating fan, inexpensive and capable of opening a shutter quickly, by a method wherein the shutter is opened by a shutter operating member consisting of a shape memory alloy and large electric current is made to flow in a conducting circuit when the shutter is opened while the conducting circuit is switched to pass small electric current when the opened condition of the shutter is to be maintained. CONSTITUTION:A motor 2 is conducted to start the rotation of vanes 4. A secondary voltage, induced in the secondary coil 17b of a transformer 17, is impressed on the shutter operating member 12 and the member 12 generates heat. When the temperature of the shape memory alloy has arrived at the temperature of transformation by the heat generated, shrinkage transformation is generated and a connecting rod 6 is pulled down through a pull rod 11 and a connecting ring 13 to open the shutter 5. A microswitch 10 is pushed by descent of the pull rod 11 through the operating recess 14 of the switch, and a resistor 18 is conducted, causing a voltage decrease; then, a small electric power necessary for maintaining the opened condition of the shutter 5 is consumed. Accordingly, a big power is not necessitated for the opening operation of the shutter and whereby the shutter may be opened quickly and the ventilating fan may be used economically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a ventilation fan with an improved shutter operation structure.

[Technical background of the invention and its problems] Conventionally, in ventilation fans, a shutter has been pivotally mounted on an outer frame that is equipped with blades and a motor that drives the shutter, and the shutter is generally operated manually by the user. It is opened by pulling the pull string. However, this pull-string operation has the problem that it places a heavy burden on the user's hands and cannot be operated lightly.

On the other hand, there is also a problem in which the shutter is opened by a motor provided separately from the motor for driving the blades, or by mechanical power such as an electromagnet. However, in this case, the motor, electromagnet, etc. are expensive, and the problem is that the overall cost increases.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and therefore, its object is to provide a system that does not require force to open the shutter, is inexpensive, and can open the shutter quickly. Another object of the present invention is to provide an excellent ventilation fan that can be used economically.

[Summary of the Invention] The present invention allows the shutter to be opened by operating a shutter operation member made of a shape memory alloy, and also causes a large current to be applied to the energizing circuit for the operation to open the shutter. The shutter is characterized in that it is provided with a switching means that switches to flow a small current to maintain the open state of the shutter after the shutter is opened.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, reference numeral 1 denotes an outer frame, and a motor 2 is fixedly disposed approximately in the center of the outer frame by means of a support column 3, and a blade 4 is attached to the rotating shaft of the outer frame. Reference numeral 5 denotes a shutter, which is attached to the rear (outdoor side) opening of the outer frame 1, for example, by attaching three shutters:
They are arranged separately below and pivoted so that they can be opened and closed. Reference numeral 6 denotes a continuous rod, to which the shutter 5 is uniformly connected, and a spring 7 is stretched between the continuous rod 6 and the support column 3, thereby applying a closing force to the shutter 5. is giving.

On the other hand, 8 is a decorative frame attached to the front (indoor side) opening of the outer frame 1, and a support plate 9 is attached to the lower front flange 1a of the outer frame 1 facing this. A normally closed microswitch 10, which together with a resistor 18 described later constitutes a switching means, is disposed above. Reference numeral 11 denotes a pull rod which is inserted into the upper part of the support plate 9 so as to be movable up and down, and a shutter operating member 12 is installed between the lower end of this pull rod and the lower part of the support plate 9. Here, the shutter operating member 12 is made of a shape memory alloy, for example, a nickel-titanium alloy, and has a diameter of about 1 [■].
It is made by forming a wire rod into a coil shape.
When heated to about ['C], it contracts and does work of approximately 1 [ka] and stroke 2 [ce], and exhibits an electrical resistance value of about 0.2 to 0.5 [Ω]. It has become. Reference numeral 13 denotes a connecting ring made of electrically insulating f material attached to the upper end of the draw rod 11, which is hooked onto the front end of the connecting rod 6, thereby connecting the draw rod 11 to the connecting rod 6. In turn, the shutter operating member 12 is connected to each of the shutters 5.

Further, reference numeral 14 designates a switch operation convex portion formed overhanging at the middle portion of the draw rod 11, and is exposed to the microswitch 10 from above.

Next, in FIG. 2, 15 is a plug that is plugged into a 100 [V] commercial power outlet (not shown), and the motor 2 is connected to this via a main switch 16.
A primary coil 17a of a transformer 17 is connected in parallel with the motor 2. 17b is trans-17α, e.g. 1-3[
A secondary coil in which a low voltage of vl is induced, to which the shutter operating member 12 is connected in series with a resistor 18, and the microswitch 1 is connected in parallel with the resistor 18.
0 is connected.

Now, in the case of the configuration above, outlet 1
When the main switch 16 is opened with the motor 5 plugged into a power outlet (not shown) and connected, the motor 2 is energized and started to rotate the blades 4. Meanwhile, at the same time, the primary coil 17a of the transformer 17 is energized to induce a secondary voltage in the secondary coil 17b, so that the shutter operating member 12 is energized. At this time, the micro switch 10
has not yet been operated, and therefore remains open in its normally closed configuration, so both ends of the resistor 18 are short-circuited so that no current flows through the resistor 18.

Therefore, in this case, all of the secondary voltages induced in the secondary coils 17b of the lances 17 are applied to the shutter operating member 12, and in this situation, the secondary voltage is 2 [V],
Resistance value of shutter operating member 12 -0.5 [Ω]
Then, the shutter operating member 12 generates heat as a current of 4 [A] flows and consumes 8 [W], and due to the heat generation, it reaches the transformation temperature of 70 to 1-00 [''C]. At that point, it undergoes a contraction transformation, thereby pulling down the connecting rod 6 through the pull rod 11 and the connecting ring 13 to open the shutter 5, as shown in FIG. As the pull rod 11 is lowered, the microswitch 10 is suppressed by the switch operation protrusion 14 and changes to the open state shown by the two-dot chain line in FIG. 2, thereby breaking the short circuit of the resistor 18. A voltage drop occurs when this resistor 18 is energized. Therefore, in this case, the resistance value of the resistor 18 is set to 1 [Ω].
Then, the resistance value of the shutter operating member 12 is 0.5 [
Due to the resistance 1 iff 11.5 [Ω] combined with 11.5 [Ω], the current is reduced to 1°3 [A], so that the shutter operating member 12 changes to consume 0.8 [W], for example 100 [” C], that is, to maintain the open state of the shutter 5 by consuming a small amount of power necessary to maintain the temperature of the shutter 5. When the main switch 16 is opened after complete ventilation, the motor 5, the shutter operating member 12, and the resistor 18 are all cut off, so the blade 4 stops rotating, and the shutter 5 is not operated. As the temperature of the member 12 decreases and the member 12 undergoes an elongation change S contrary to the above, it returns to the closed state due to its own weight and the biasing force of the spring 7. As described above, according to this embodiment, the shutter 5 is made of a shape memory alloy. The shutter can be opened by a shutter operating member 12 consisting of a shutter operating member 12, and the user's effort required to open the shutter is minimal, such as operating the main switch 16, and the shutter can be opened manually by the user using a conventional pull string operation. Since it does not require the large force required to open the shutter, it is possible to achieve a significant improvement in operability.In addition, compared to conventional electric shutters that use motors and electromagnets, shape memory alloy Even if the shutter operating member 12 consisting of the transformer 17, microswitch 10, resistor 18, etc. is added, it is cheaper than those motors, electromagnets, etc., and therefore the overall cost can be reduced. .Furthermore, the shutter operating member 12
The energizing circuit for operating the shutter 5 includes a switching means consisting of a microswitch 10 and a resistor 18.
A large current is applied when the shutter 5 is opened, and after the shutter 5 is opened, a small current is applied to maintain the open state of the shutter 5, so that the shutter 5 can be opened quickly. Not only that, but after it is opened, the power consumption can be kept low, making it more economical to use.

Note that the transformer 17 may be one in which the main winding of the motor 2 or the like is used as the primary coil.

Alternatively, the shutter operating member 12 may not be directly energized, but a heater disposed near the shutter operating member 12 may be energized and the shutter operating member 12 may be operated by the heat generated by the heater. Furthermore, in this case, both the heater and the shutter operating member 12 may be energized to operate the shutter operating member 12. In addition, the switching means is not limited to the aforementioned one using the microswitch 1° and the resistor 18, and other suitable means such as the use of a thermistor may be used.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be implemented with appropriate modifications within the scope of the gist.

[Effects of the Invention] As is clear from the above description, according to the ventilation fan of the present invention, no force is required to open the shutter, and the operability can be greatly improved, and the price can be reduced. Moreover, the shutter can be opened quickly, and can be used economically.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a vertical cross-sectional side view with the shutter closed, FIG. 2 is an electric circuit diagram, and FIG. 3 is a diagram with the shutter open. It is a longitudinal side view of the whole. In the figure, 2 is a motor, 4 is a blade, 5 is a shutter, 10 is a micro switch (switching means), 11 is a pull rod, 12 is a shutter operation member, 14 is a switch operation protrusion, 17 is a transformer, and 18 is a resistor. (switching means) is shown. Applicant Toshiba Corporation Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The device is equipped with a blade and a motor for driving the blade, and a shutter, the shutter is opened by actuation of a shutter operation member made of a shape memory alloy, and the shutter is connected to an energizing circuit for the actuation. 1. A ventilation fan, characterized in that a switching means is provided for switching to flow a large current when the shutter is opened, and to flow a small current to maintain the open state of the shutter after the shutter is opened.