JPS6089631A - Ventilation fan - Google Patents

Abstract

PURPOSE:To provide an automatic shutter closing device in which not only the number of component elements can be decreased, but also their reuse can be performed and the device is operated when a fire occurs by a method wherein a stopper made of shape memory alloy is used in place of a temperature fuse stopper and an operating spring. CONSTITUTION:A stopper 14 made of shape memory alloy is returned to its original position when its temperature is reached to a melting point of a temperature fuse stopper in the conventional system and then the stopper is set to extend. With the stopper being set in this way, when a fire occurs and a surrounding temperature of the ventilation fan is reached to a shape returning temperature of the stopper 14 of shape memory alloy during a condition in which the switch is turned on, i.e. the shutter 6 is kept open, the stopper 14 of shape memory alloy is extended to cause the operating element 11 to be pushed down and a connection between the connector rod 7 and the wire 9 for the switch is released. Then, the connector rod 7 is raised up by the force of the shutter spring 15, resulting in that the shutter 6 is automatically closed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a ventilation fan that exhausts waste gas generated indoors to the outside.

Conventional Structure and Problems Conventionally, a ventilation fan has been used to exhaust waste gas generated inside a room to the outside. In particular, there is a need for a ventilation fan that exhausts oil smoke, combustion gas, water vapor, etc. to the outside of the kitchen in a short time without dispersing it into the living area. However, since fire is used in the kitchen, if a fire breaks out when a ventilation fan is in use, the gap between the shutters will not only serve as an oxygen supply port, but the flames will also spread from the gap to the outside and spread to other buildings. There is a risk of the fire spreading. Therefore, in the event of a fire,
There has been a demand for a ventilation fan whose shutter automatically closes.

Hereinafter, the conventional ventilation fan as described above will be explained with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view of a conventional ventilation fan, and FIG. 2 is an enlarged front view of a connecting rod portion. 101 is a frame of a ventilation fan, 102 is a shutter provided at the outdoor opening of the frame 101 so as to be openable and closable, 103 is a connecting rod movably connected to the shutter 102, 104 is connected to the connecting rod 103, and the shutter 102
105 is the connecting rod 10
A shutter spring 106 pulls up 3 to close the shutter 102, an actuator 106 is rotatably attached to the connecting rod to connect the connecting rod 103 and the switch wire 104, and 107 connects the connecting rod 103 and the switch wire 104. An actuator spring 108 that moves the actuator in a direction to disconnect the wire 104 is a temperature fuse stopper for restricting the actuator spring 107 from disconnecting the connecting rod 103 and the wire 104 of the switch.

The operation of the ventilation fan configured as described above will be explained below. First, since the shutter spring 105 is connected to the frame body 101 and the connecting rod 103, the connecting rod 103 is constantly pulled up by the shutter spring 105. Next, the connecting rod 10
The actuator 106, which is rotatably attached to the actuator 3, is subjected to a rotational force by an actuator spring 107, but is restricted by a stopper 108 of the temperature fuse. The wire 104 of the switch is connected to the actuator 10.
6, and when the switch is OFF, the wire 104 of the switch is stretched to the maximum, the connecting rod is pulled up to the top, and the shutter 102 is in a closed state. When the switch is turned on, the switch wire 104 becomes the shortest, the connecting rod 103 is pulled down through the actuator 106, and the shutter 102 is fully opened. When the switch is on, that is, when the shutter 102 is fully open, a fire occurs and the ambient temperature of the ventilation fan rises, and when it reaches the melting temperature of the temperature fuse stopper 108, the temperature fuse stopper 108 melts. Then, the actuator 106 is rotated by the force of the actuator spring 107, and the connection between the actuator 106 and the switch wire 104 is released. The connecting rod 103, which has been disconnected from the switch wire 104, is pulled upward by the force of the shutter spring 105, and the shutter 102 is automatically closed.

However, the above configuration has the following drawbacks. For one thing, once a thermal fuse stopper has melted, it cannot be used again and must be replaced with a new one. In the case of a real fire, the ventilation fan itself will burn and become unusable, but if the ambient temperature rises, the stopper 108 of the temperature fuse will melt simply due to prolonged use of the fire. must be replaced with that of

Further, since the actuator spring 107 is always in an extended state, it may become sagging and lose its elasticity, and thus may lose its spring characteristics.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a device that once the connection between the connecting rod and the switch is released, it can be used again without replacing the parts, and also avoids the use of springs, which are difficult to maintain their shape, as much as possible. It provides ventilation fans.

DESCRIPTION OF THE INVENTION In order to achieve this object, the ventilation fan of the present invention does not use the above-mentioned conventional actuator spring and temperature fuse, but has a stopper made of a shape memory alloy that performs both functions at the same time. This shape memory alloy stopper restricts the rotation of the actuator at normal temperatures, and at high temperatures it functions to rotate the actuator by its own expanding force and release the connection between the switch and the connecting rod. This configuration allows the stopper to be used many times and eliminates the need for springs.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. Fig. 3 is a cross-sectional view of a ventilation fan according to an embodiment of the present invention, Fig. 4 is an enlarged view of the connecting rod portion, and Fig. 5 is a cross-sectional view showing the state in which the cyst buckle is expanded by heat and the shutter is closed. be.

1 is a frame of the ventilation fan, 2 is an electric motor, 3 is an impeller attached to the electric motor 2, 4 is a mounting leg for fixing the electric motor 2 to the frame 1, and 6 is an orifice attached to the indoor opening of the frame 1. ,6
is a shutter provided at the outdoor opening of the frame body 1 so as to be openable and closable; 7 is a connecting rod movably connected to the shutter θ; 8 is a switch for operating the motor 2; 9 is connected to the connecting rod 7;
A wire for a switch that opens and closes the shutter 6 by moving up and down in conjunction with ON and OFF of the switch 8, 10
is the pull string that turns switch 8 on and off, 11
1 is an actuator rotatably attached to the connecting rod 7 in order to connect the connecting rod 7 and the switch wire 9; 12 is a convex portion of the actuator 11 on which the switch wire 9 is hooked;
3 is a concave sound barrier 14 of the connecting rod 7 which is used to release the contact of the switch wire 9, which fixes the rotation of the actuator 11 at room temperature, expands by itself at high temperatures to fix the actuator 11, and connects the connecting rod 7. 15 is a shutter spring that pulls up the connecting rod γ and closes the shutter 6; 16 is a fulcrum on which the shutter 6 is rotatably fixed to the frame 1; , 17 is a fulcrum at which the shutter 6 is rotatably fixed to the connecting rod 7, and 18 is a fulcrum at which the actuator 11 is rotatably fixed to the connecting rod 7.

The operation of the ventilation fan configured as above will be explained below. First, at room temperature, the shape of the stopper 14 made of a shape memory alloy is constant, so the actuator 11 cannot rotate around the fulcrum 18.
It is fixed in the position shown in FIG. Therefore, the wire 9 of the switch is hooked onto the protrusion 12 of the actuator 11, and the connecting rod 7 and the switch 8 are connected. So, pull the switch pull string 10,
When the switch 8 is turned on, the wire 9 of the switch 0 is linked with the pull string umbrella of the switch to make it as short as possible, and the connecting rod 7 is pulled down. Then,
As the connecting rod 7 is pulled down, the shutter 6
rotates around the fulcrum 16 and is in an open state as shown in FIGS. 3 and 4.

Next, the shape memory alloy stopper 14 is set so that it returns to its shape and expands when it reaches the melting temperature of the stopper of the conventional temperature fuse. With this setting, when the switch is ON, that is, when the shutter 6 is open, if a fire occurs and the ambient temperature of the ventilation fan reaches the shape recovery temperature of the shape memory alloy stopper 14, the shape will change. The memory alloy stopper 14 extends and pushes the actuator 11 down as shown in FIG.
Disconnect the connecting rod γ and the wire 9 of the switch. Then, the connecting rod 7 is pulled up by the force of the shutter spring 15, and the shutter 6 is automatically closed.

As described above, according to this embodiment, the same operation as the conventional example can be obtained by using a shape memory alloy stopper instead of the temperature fuse stopper and actuator spring of the conventional example.

Effects of the Invention In this way, the shape memory alloy stopper simultaneously performs the functions of the conventional temperature fuse stopper and actuator spring, so it not only reduces the number of parts, but also uses the spring, which maintains its shape for a long period of time. It does not require the use of difficult parts, yet it is difficult to maintain a constant melting temperature with temperature fuses, whereas with shape memory alloys it is easy, thus improving the quality of the product. Additionally, a temperature fuse stopper must be replaced with a new one once it melts, whereas a shape memory alloy stopper can be used many times.

As described above, the present invention has significant practical effects.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional ventilation fan, Fig. 2 is an enlarged front view of a connecting rod portion of a conventional example, Fig. 3 is a sectional view of a ventilation fan in an embodiment of the present invention, and Fig. 4 is a connecting rod portion. FIG. 5 is an enlarged side view of the shutter, and FIG. 5 is a sectional view showing a state in which the stopper is expanded by heat and the shutter is closed. 1... Frame body, 2... Electric motor, 3...
・Impeller, 6...Shutter, 7...Connecting rod,
8... Switch, 11... Operator, 1
4...Shape memory alloy stopper, 16...
...Shutter spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A frame body that has an electric motor that drives an impeller inside and has an opening on the indoor side and the outdoor side, a shutter ivy that can be opened and closed at the outdoor side opening of this frame body, and a movable shutter that is connected to the shutter. A connected connecting rod, a shutter spring that pulls up the connecting rod to close the shutter, a switch that is connected to the connecting rod and opens and closes the shutter, and a connecting rod that connects the connecting rod and the switch. It has an actuator that is rotatably attached, and a shape memory alloy stopper that fixes the rotation of the actuator and connects the connecting rod and the switch, and when the temperature is high, the stopper deforms and causes the actuator to rotate. , a ventilation fan that releases the connection between the connecting rod and the switch.