JPS6287745A - Automatic ventilating device by sensing temperature - Google Patents

Abstract

PURPOSE:To ensure a device which is free from maintenance for a long period of time and obtain a pleasant environment, by opening and closing a window for ventilation by the action of a shape memory alloy. CONSTITUTION:A window 3 for ventilation incorporating a shape memory alloy is provided on a ceiling 2 of a building. A cylinder 7 capable of expanding and contracting is placed between a cap 6 of the window 3 for ventilation and the ceiling 2, where said cylinder 7 and a spring 16 of shape memory alloy are connected so that they are associated with each other. In such a constitution, when the temperature in the building 1 is high, ventilation is performed by contracting the cylinder 7 upward or downward to open the window 3 for ventilation by means of the phase transformation of the shape memory alloy caused by the change in temperature as a driving source, on the other hand, by moving said cylinder 7 in the direction opposite to that at high temperature to close said window 3, causing circulating current of air to be stopped.

Description

Detailed Description of the Invention The present invention provides a circulation system that automatically opens and closes according to temperature by attaching a ventilation opening/closing bag cylinder using a shape memory alloy as a sensor and actuator to telephone booths, greenhouses, firefly factories, etc. This relates to structures that are intended to be ventilated.

When buildings such as telephone booths have high temperatures such as in the summer, the greenhouse effect is added, creating an extremely hot environment for the deaf.

On the other hand, during low temperatures such as in winter, it is necessary to seal the room to block out the cold air.

Therefore, it is possible to install a manual or electric ventilation window, open the window in the summer, and close it in the winter, but manual ventilation requires effort to open and close. There remains the problem of leaving it in the closed state, and in the case of electric power, there are problems with cost, maintenance, etc.

Therefore, the present invention prevents the greenhouse effect in the summer and conversely, blocks out cold air in the winter, so when the temperature inside the building reaches a certain temperature, for example, 20cc or more, the shape memory alloy is activated. A window for ventilation? Open to create a circulation flow between the inside of the building and the outside air for ventilation.Conversely, when the temperature drops below 208C, the ventilation windows will automatically close and cut off air circulation to deal with the cold. That is.

FIG. 1 is a schematic front view of a building 1 in which a ventilation window 3 in which a shape memory alloy is incorporated is attached to a ceiling 2 of a building 1, and an opening 4 is installed near the lower end of the building 1.

The embodiment will be described assuming that the building 1 is a telephone booth.

An arbitrary number of ventilation windows 5 are installed at arbitrary positions on the ceiling 2 of the telephone box, and an opening 4 having a jalousie-type gap group or a simple opening is provided near the lower end of the box.

The ventilation window 6 is as shown in the enlarged cross-sectional view of FIG. 2 or FIG.

One or more holes 18 having any shape and size, such as circular or square, are made in the ceiling 2 of the box 7, and an appropriate number of pillars 5 are erected around the holes, and a hemispherical dome is placed on top of the pillars 5. Roof 6 of type, or gable type, etc. [Make U sound.

Place a cylindrical or cubic shape or the like so that it extends somewhat around the hole 18 in the ceiling 2.

The tube 7 is divided into an arbitrary number of sections between the ceiling 2 and the roof 6, and has a claw 8 at each end, so that each section expands and contracts by sliding, so that it has a so-called bamboo shoot shape. When it contracts, it is stored in a storage tube 9 inside the roof 6.

If desired, the configuration of the tube 7 may be a bellows type that can be expanded and contracted, instead of the bamboo shoot type.

In between, a washer (■) which can be slid against the mandrel 11 is placed.

The washer 14 and the lowermost end of the bamboo shoot-shaped tube 7, the tube 71, are connected by a thin connecting rod 17 of any shape, such as straight or curved.

A compression type bias spring 15 is placed between the washer 14 and the clasp 12, and a shape memory alloy spring 16 is placed between the washer 14 and the clasp 16.

At this time, the shape memory alloy spring 16 is preferably bidirectional, but may be unidirectional.

If desired, the bias spring 15 can be omitted when the weight of the tube 7 or the washer 14 is used instead of the bias spring 15. Further, instead of the bias spring 15, a weight may be used.

Further, the direction in which the cylinder 7 is stored may be such that it contracts from the bottom upwards, or that it contracts downwards from the top. However, the direction of operation of the shape memory alloy is reversed.

Further, depending on the case, a ventilation fan that rotates naturally by upward flow or crosswind when the cylinder 7 is opened, or an electric ventilation fan may be installed inside or outside the cylinder 7. However, it is preferable that the electrically-driven rotation is configured such that the power switch is turned on and off by operating the lower part of the washer 14.

・The enlarged cross-sectional view of the ventilation window shown in Figure 'n5 shows a structure in which the ceiling 2 is raised into a trapezoidal shape, the ventilation window 3 is installed on top of it, and the arms 22, etc. are made to protrude from the support 5 on the outside of the cylinder 7. This is an example of a method in which the outer circumferential wall 21 of a cylindrical shape or the like is fixed, and the wind power of an external crosswind is used to provide a suction force to promote circulation flow within the building 1.

If desired, this outer peripheral wall 21 may be rotatable.

As mentioned above, this temperature-sensitive automatic ventilation system includes (1) a ventilation window 6 in which a shape memory alloy is incorporated in the ceiling 2 of a building 1;
One or more are provided, and an opening 4 is provided near the lower end of the structure 1.

(2) Between the roof 6 of the ventilation window 5 and the ceiling 2 of the building 1, a bamboo-shaped or bellows-shaped tube 7 is placed so that it can be expanded and contracted, and in some cases, the tube 7 is (6) Connect the cylinder 7 and the shape memory alloy spring 16 so that their operation is interlocked.

With the above configuration, the ventilation window can be opened by contracting the tube 7 upward or downward when the inside of the building 1 is at high temperature, using the phase transformation caused by the temperature change of the shape memory alloy as a driving source. , Ventilation is achieved by utilizing the circulating flow that passes through the building 1 between the outside air and when the temperature is low, the tube 7 of the ventilation window 6 is operated in the opposite direction to that when it is high temperature to create a closed state. This device is characterized by a configuration that blocks circulating flow.

The operation of the temperature-sensitive automatic ventilation system having the above configuration is as follows.

An embodiment will be described based on the drawings assuming that the temperature-sensitive automatic ventilation device is installed in a telephone booth.

The shape memory alloy spring 16 used here is a copper-based bidirectional coiled spring.

To simplify the explanation, when the ambient temperature shifts from a low temperature side to a high temperature side, the spring 16 undergoes a phase transformation at 208C or higher, and attempts to stretch to restore the stretched state set in memory.

When transitioning from the high temperature side to the low temperature side, the temperature shall be set to shrink at 20°C or less.

That is, it is simply assumed that a temperature change with a boundary of 20° C. serves as a driving source for an expansion/contraction stroke operation.

For example, assume that the temperature inside the telephone box is 108C and gradually increases.

Since the temperature inside the box is less than 2 CPC, the shape memory alloy Pi-16 contracts and is in a compressed state.

Therefore, 7 is its own weight and the bias spring 1
Due to the stretching force of 5, the tube 7□ extends downward, and the ceiling 2 becomes a bar and becomes stuck, and the tube 7 is pushed against the hole 18 leading to the inside of the telephone booth, as shown by the solid line in FIG. Creating a closed state.

Now, if the ambient temperature exceeds 20° C., the shape memory alloy spring 16 attempts to return to its memorized stretched state and expands.

The temperature-responsive operation of the spring 16 compresses the bias spring 15 set opposite to the washer 14, and the slidable washer 14 is pushed upward.

Since the washer 14 and the cylinder 71 are interlocked and connected by the connecting culm 17, the cylinder 71 is also pushed upward.

If this operation continues, the claws 8 protruding from the lower end of the tube 71 will catch the tube 72, and the claws 8 of the tube 72 will hook the tube 7n and pull it up, eventually storing it. This results in the hole 18 being completely open to the outside air.

On the other hand, there is an opening 4 near the bottom of the phone box, and the inside of the box is hotter than the outside air due to the greenhouse effect, etc., so the opening 4 → inside the phone box → A circulation flow is generated that flows from the hole 18 to the open ventilation window 3 to the outside air, and ventilation is performed.

20° if the temperature inside the telephone box drops from the high temperature side
When the value becomes lower than C, the shape memory alloy spring 16 attempts to restore its compressed state and begins to contract.

Accordingly, the washer 14 is pushed downward by the tension force of the bias spring 15 and the weight of the cylinder 7, and as the shape memory alloy spring 16 contracts, the washer 14 descends, causing the cylinder 7 to move in conjunction with the connecting culm 17.
The ventilation window 3 also descends with it, and the ventilation window 3 becomes closed.

In this way, the tube 7 closes the hole 18 when the temperature is low, so even if the opening 4 is open near the bottom end of the telephone box, no circulation flow with the outside air occurs and the cold air is blocked. It turns out.

As mentioned above, this temperature-sensitive automatic ventilation system uses the phase transformation caused by temperature changes in the shape memory alloy as a sensor and actuator, so it does not require any external activation input, has an extremely simple configuration, and has a long-term lifespan. It is a device that guarantees free maintenance and can create a more comfortable environment at high temperatures.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a building in which one temperature-sensitive automatic ventilation system according to the present invention is installed. FIG. 2 is an enlarged sectional view of a ventilation window. FIG. 6 is an enlarged sectional view of the ventilation window.

Claims (3)

[Claims] (1) One or more ventilation windows 3 incorporating a shape memory alloy are provided in the ceiling 2 of the building 1, and an opening 4 is provided near the lower end of the building 1. (2) Between the roof 6 of the ventilation window 3 and the ceiling 2 of the building 1, a bamboo-shaped or bellows-shaped tube 7 is placed so that it can be expanded and contracted. (3) The tube 7 and the shape memory alloy spring 16 are connected so that their operations are interlocked. With the above configuration, the device is characterized in that when the inside of the building 1 is at high temperature, ventilation is achieved by utilizing the circulating flow that passes through the building between it and the outside air, and when the temperature is low, the circulating flow is blocked.