JPH0332910Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to an exhaust device that exhausts indoor air to the outdoors, and in particular, to automatically exhaust air in response to indoor temperature changes. This relates to an exhaust system that can

(Prior art) Conventionally, for example, in the summer, the room temperature may become very high in a sunroom, attic, bay window, room with tightly closed windows, etc., and the hot indoor air is discharged outdoors. Therefore, in general,
It is well known to attach an exhaust system to the exhaust vent of a building. In addition, many of these exhaust devices open and close the exhaust holes by direct or remote control, and when the exhaust holes are left open,
In some cases, fans were operated artificially to exhaust indoor air outdoors.

(Problem to be solved by the invention) However, in the conventional exhaust system as described above, the means for starting and stopping the exhaust system is through direct manual operation or remote control. When exposed to high places, a temperature sensor, a control circuit, a motor for opening and closing the exhaust hole, etc. are required, resulting in a very complicated structure and high cost. In addition, in order to eliminate the need for the wiring work mentioned above,
It is also known to use solar cells, but it is necessary to keep the temperature sensor and control circuit energized at all times, and the power generation capacity of solar cells changes depending on the weather and sunlight, so it is necessary to use secondary batteries or There was a problem in that a power storage device was required and was expensive.

The purpose of this invention was to solve the problems of the conventional technology as described above, and it automatically exhausts indoor air to the outdoors according to indoor temperature changes to prevent the indoor atmosphere from rising. It is an object of the present invention to provide an exhaust system that can prevent and lower the air and achieve the above objectives at low cost.

[Structure of the invention] (Means for solving the problem) An exhaust system according to this invention includes an electric exhaust fan provided in an opening of a fan storage frame and an opening/closing body for the opening. A pulley is rotatably provided in a fan storage frame, and the other end side of a biasing elastic body whose one end side is connected to the fan storage frame is connected along the outer periphery of the pulley, and the other end side is connected to the fan storage frame at a position in contact with the indoor atmosphere. The other end side of a shape memory alloy displacement body is provided and connected at one end side to the fan storage frame, and the other end side is connected to the front outer edge of the pulley, and the connection position of the other end side of the displacement body is determined by the shape memory of the displacement body. The connection position is set to a position that is symmetrical about the axis of the pulley with respect to the contact point position with the pulley on the other end side of the biasing elastic body in the shape recovery state due to the action, and the displacement body and the elastic body are The structure is characterized in that the displacement caused by the balance of forces with the opening/closing body is used as the opening/closing drive source of the opening/closing body and the power source switching drive source of the electric exhaust fan. In a more preferred embodiment, the electric exhaust fan is powered by the sun. It is characterized by a configuration that uses batteries.

(Function of the invention) The exhaust system related to this invention operates the opening/closing body to the opening side and closing side by the displacement body contracting (shape recovery) and expanding in response to the rise and fall of the indoor atmospheric temperature. The displacement due to the balance of forces between the displacement body and the elastic body is used as the drive source for opening and closing the opening and closing body and the power source switching source for the electric exhaust fan, so the operation of opening and closing the electric exhaust fan with the opening and closing body in the open state is The operation of closing the body and stopping the exhaust electric fan can be performed with a small amount of displacement body.

(Embodiment) FIGS. 1, 2, and 3A and 3B show an embodiment of an exhaust system according to this invention.

That is, the exhaust system 1 according to this invention includes an electric exhaust fan 32 on the outdoor side of the fan storage frame 20.
In addition, a movable gate 35, which is an opening and closing body, is provided on the indoor side of the fan storage frame 20, and in this embodiment, three gate wings 35a are connected by an interlocking rod 35c, The lever 35 is opened and closed by vertically moving a link 35d attached to the interlocking rod 35c. A contactor 22 is provided at the end of the flap blade 35a located at the top of the flap 35.
A contact piece 30a is located at a position corresponding to this contactor 22.
A switch 30 is installed. When the contact piece 30a of the switch 30 and the contactor 22 are separated, power is supplied to the drive motor of the electric exhaust fan 32, causing the electric exhaust fan 32 to rotate.

Further, a pulley 41 is rotatably attached to the indoor side surface of the fan storage frame 20.
A non-shape memory alloy whose lower end part (lower end part) of the bias side string 42 fixedly wrapped around the outer periphery of the fan storage frame 20 is fixed to a fixing hook 20a provided below the interior surface of the fan storage frame 20. The other end (upper end side) of the manufactured coil spring 23 (bias elastic body)
are connected to each other at a connecting portion 24. On the other hand, the string 43 on the displacement body side, which is locked to the outer edge of the indoor surface of the pulley 41, is connected to the link 35d of the interlocking rod 35c, and has one end (lower end) attached to the lower side of the indoor surface of the fan storage frame 20. A coiled shape memory alloy spring 2 that is locked to a fixed hook 20b provided.
The other end (upper end side) of 7 (displacement body) is the link 35
d, and these constitute a switch mechanism S that turns on and off the power to the drive motor in conjunction with the displacement of the shape memory alloy spring 27.

The spring 27, which is a displacement body made of a shape memory alloy, has a shape memorized in a contracted state as shown in FIG. By the spring 23, it is distracted as shown in FIG.
As shown in FIG. 1, when the room temperature rises above a predetermined temperature, the material has a characteristic of recovering its shape to the stored contracted state. (December 20, 1980 Published by Maruzen Co., Ltd. Revised 4th edition Metal Handbook No.
(See pages 965 to 966) Furthermore, as shown in FIG. 27 is contracted due to shape recovery (as described later, at this time, the louver 35 is opened and the electric ventilation fan 32 rotates), the bias side string 42 is closed as shown in FIG. 3B. and a symmetrical position on the opposite side to the coil spring 23 (a position at 180 degrees with respect to the pulley shaft 41a). When the indoor ambient temperature drops and the shape memory alloy spring 27 is extended by the bias coil spring 23 as shown in FIG.
The exhaust fan 32 stops. ), the pulley 41 is rotated 45 degrees clockwise to the position shown in FIG. 3A.

The exhaust device 1 further includes a sloped cover 40 that opens downward on the outdoor side of the fan storage frame 20, and a solar battery 34 on the outer wall of the cover 40.
is attached as a driving power source for the electric exhaust fan 32.

In the exhaust device 1 having the above configuration, for example, when the indoor atmospheric temperature is below a predetermined temperature, the shape memory alloy spring 27 is in a state where it can be freely deformed, and a non-shape memory alloy spring 27 for biasing is used. The alloy coil spring 23 rotates the pulley 41 clockwise, thereby stretching and holding the shape memory alloy spring 27 in this state, and closing the gate 35 as shown in FIG. ing. At this time, the contact piece 30a of the switch 30 and the contact 22 provided on the wing 35a
is in contact with the exhaust fan 32, and the exhaust electric fan 32 is stopped.

When the indoor ambient temperature is a specified temperature (shape memory alloy
If the temperature rises above Af point (e.g. 25℃),
The shape memory alloy spring 27 recovers its shape to the contracted state, and the bias coil spring 23
By rotating the pulley 41 counterclockwise against the tensile force of , and moving the interlocking rod 35c downward as shown in FIG. 1, the exhaust hole C is opened. By separating the contact piece 22 and the contact piece 30a of the switch 30, the circuit connecting the drive motor of the electric exhaust fan 32 and the solar cell 34 is closed, the electric exhaust fan 32 rotates, and the high temperature is increased. It can automatically exhaust stale indoor air to the outside, lowering the indoor temperature.

In the open state of the exhaust hole C, when the indoor atmospheric temperature drops below the Af point, the shape memory alloy spring 27 becomes easily deformed, and the pulley 41 is moved again by the tensile force of the bias coil spring 23. Rotate clockwise until fully 35
At the same time as the exhaust fan 32 is closed, the electric exhaust fan 32 stops, and the exhaust system 1 automatically returns to the state shown in FIG.

At this time, the shape memory alloy spring 27
By attaching the non-shape memory alloy coil spring 23 for bias to the pulley 41 in the above-mentioned positional relationship, the shape memory alloy spring 27 and the bias coil spring 23
Even when using a spring with a small amount of shape memory alloy, the difference in tensile force between high temperature (contraction) and low temperature (stretching) can be made large. In addition, reliable operation as a switch mechanism is possible, and the amount of expensive shape memory alloy used can be significantly reduced.

That is, the connection position on the other end side of the displacement body (shape memory alloy spring) 27 is
In the heat-shrinking state due to the shape memory effect of Since the positions are set to be symmetrical, the time when the repulsive force of the biasing elastic body 23 is the largest can be matched with the time when the moment of the displacement body 27 is the largest, so that the displacement The contraction force required for the body 27 during heating is made smaller.

In other words, as shown in FIGS. 1 and 3B, when the biasing elastic body 23 is stretched, the tensile force M in the biasing elastic body 23 is increasing, so the pulley 41 is not shown in the figure. In order to balance and stop at the stop position shown, the shaft 41a of the pulley 41
The distance l2 from the point of contact with the pulley 41 on the other end side of the biasing elastic body 23 to the pulley 41
The distance L1 from the axis 41a of the displacement body 27 to the connection position on the other end side of the displacement body 27 is maximized.
The force F required for 7 can be small due to F・L1=M・l2.

Furthermore, as shown in FIGS. 2 and 3A, when the bias elastic body 23 is contracted, the tensile force m in the bias elastic body 23 decreases, so the pulley is not shown in the figure. In order to stop the pulley 41 in a balanced manner at the stop position shown in FIG. Even if the distance l1 to the connection position on the other end side of the displacement body 27 is reduced, the tensile force m is reduced, so the force f required for the displacement body 27 can be reduced by f・l1=m・l2. .

For example, in this example, the wire diameter is 0.5 mm and the outer diameter is 5 mm.
By using a shape memory alloy spring 27 with a diameter of 80 mm, a number of turns of 80, and a weight of 1.5 g, a tensile load difference of approximately 100 g is obtained.
When connecting via a string wrapped around the wire, the wire diameter is 1.0 mm and the outer diameter is 10
A shape memory alloy spring with a diameter of 30 mm, 30 turns, and a weight of 5 g is required, and it has been confirmed that this reduces the amount of expensive shape memory alloy used and reduces costs. .

In addition, in the exhaust system according to this invention, the displacement body made of shape memory alloy is not limited to a coil shape, but can also be used in a shaft shape or a linear shape, and the material can be Ti-Ni, Cu-Zn, Cu−Al−Ni, Cu
-Zn-Al, Ag-Cd, In-Tl, etc., without any limitation.

In addition, the solar cell 34 is not limited to types such as monocrystalline Si, polycrystalline Si, amorphous Si, etc., and the mounting position is not limited at all.
More preferably, the solar cell 34 is provided with a stabilizing circuit in order to stabilize the output of the solar cell 34.

[Effects of the invention] As explained above, since the exhaust system according to this invention has the above-described configuration, it can automatically and forcibly exhaust air in response to temperature changes in the indoor atmosphere. It is possible to prevent the rise or fall of the ambient temperature, and even when installed in a high place that is difficult to reach, reliable operation is possible, and it is inexpensive because the wiring work for remote control can be simplified. At the same time, it has the excellent effect of reducing the amount of shape memory alloy used and making it possible to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the driving state of the exhaust system in an embodiment of this invention, Fig. 2 is a perspective view showing the stopped state of the exhaust system of Fig. 1, and Fig. 3A is the same as shown in Fig. 2. An explanatory diagram showing the attachment positional relationship of the shape memory alloy displacement body and the bias elastic body to the pulley when the exhaust system is stopped, and Figure 3B shows the position of the pulley when the exhaust system is in the driving state shown in Figure 1. FIG. 1... Exhaust system, 20... Fan storage frame, 23
...Elastic body for bias, 27...Displaceable body made of shape memory alloy, 32...Electric exhaust fan, 34...Solar cell, 35...Opening/closing body, 41...Pulley, 41a
...shaft, C...opening part.

Claims (1)

[Claims for Utility Model Registration] (1) An exhaust system including an electric exhaust fan provided in an opening of a fan storage frame and an opening/closing body for the opening, wherein the fan storage frame includes a pulley rotatably. The other end side of the biasing elastic body, which has one end side connected to the fan storage frame, is connected along the outer periphery of the pulley, and is provided at a position in contact with the indoor atmosphere, and one end side is connected to the fan storage frame. The other end of the displacement body made of a shape memory alloy is connected to the outer edge of the front surface of the pulley, and the connection position of the other end of the displacement body is in the shape recovery state due to the shape memory effect of the displacement body. The biasing elastic body is set at a position symmetrical about the axis of the pulley with respect to the contact point with the pulley on the other end side, and the displacement due to the balance of forces between the displacement body and the elastic body is applied to the opening/closing body. An exhaust system comprising: an opening/closing drive source and a power switching drive source for the exhaust electric fan. (2) The exhaust system according to claim (1), wherein a solar battery is used as a power source for the electric exhaust fan.