JPS61213430A - Electric shutter conttol device for ventilation fan - Google Patents

Abstract

PURPOSE:To reduce the cost by simplifying the construction and reducing the assembly processes by making up an electrical shutter control device with a heater wire that is electrified to heat the shape memory alloy when the ventilation fan motor is started. CONSTITUTION:In the present electric shutter control device 4, the nichrome wire 8 generates heat when electrified to raise the temperature inside the pipe 6. When the transformation temperature of the shape memory alloy 9 is reached, the shape memory alloy contracts itself to pull the wire coupler 10, wire 11 and connecting rod 3 to open the shutter 2. On the other hand, when the power is turned off, the heat generation of the nichrome wire is stopped, and the interior of the pipe 6 is gradually cooled off. When the temperature of the shape memory alloy 9 becomes lower than its transformation temperature, the shape memory alloy 9 is extended by the force of the return spring 5 to close the shutter. In this manner, the construction is simplified, erratic movements are reduced, assembly processes are reduced, and adjustments become unnecessary, resulting in the reduction of cost.

Description

[Detailed description of the invention] Industrial application field E! A relates to an electric shutter opening/closing device for a ventilation fan that is attached to a wall in a kitchen or the like.

BACKGROUND OF THE INVENTION Conventionally, electric shutter opening/closing devices for ventilation fans of this type have been constructed as shown in FIGS. 4 to 7, although no specific literature is cited. That is, 101 is a ventilation fan main body, and a plurality of shutters 102 are provided at the rear opening so as to be openable and closable.

The end of each shutter 102 is connected to a connecting rod 103, and when operating the motor installed in the ventilation fan main body 101, the connecting rod 103 is simultaneously pulled down by a wire 104a provided in an electric shutter opening/closing device 104. As shown in FIG. 6, each of the seven shafts 102 opens. Then, when the motor of the ventilation fan main body 101 is stopped, it is simultaneously pulled down by the wire 104a of the electric shutter opening/closing device 104, and the connecting rod 103 is pulled up by the return spring 106, and as shown in FIG.
02 is designed to close.

FIG. 7 shows its circuit diagram. The motor 106 of the ventilation fan body 101, the synchronous motor 107 of the electric shutter opening/closing device 104, and the magnet 108 are connected in parallel to a power source, and are opened and closed by a switch 109. The synchronous motor 107 is also opened and closed by a limit switch 110. FIG. 4 shows a detailed view of the electric shutter opening/closing device 104. A synchronous motor 107 is directly connected to the cam 111. cam 1
A wire 104a is connected to the wire 11, and the other end is fixed to the connecting rod 103. Reference numeral 112 denotes a clutch that engages or disengages a gear built inside the synchronous motor 107.

In the conventional electric shutter opening/closing device configured as described above, when energized, the motor 10 of the ventilation fan main body 101
At the same time as the magnet 6 rotates, the 108° synchronous motor 107 is also energized, and the lever 113 is connected to the clutch 112.
By engaging the holding gear, the rotation of the synchronous motor 107 is transmitted to the cam 111, and the wire 112 supported by the cam 111 moves downward with the rotation of the cam 111, pulls down the connecting rod 103, and closes the shutter 102.
open. The cam 111 continues to rotate further, and when the protrusion 114 of the cam 111 reaches a position where the limit switch 110 is actuated, the synchronous motor 107 is no longer energized and stops rotating. However, since the lever 112 is pushed by the lever 113 of the magnet 108 and the gear is engaged, the cam 111 is fixed without rotating, and the connecting rod 103 is fixed in the lower position. Then, when the power is turned off, the magnet 1 that was holding the clutch 112
The lever 113 of 08 goes up to release the clutch, and the cam 111 is reversed as the connecting rod is pulled up by the return spring 105, and the shutter 102 is closed.

Problems to be Solved by the Invention In this conventional configuration, the number of component parts is large, which requires a large number of assembly steps, and the cost of each part is high, which causes a significant increase in the cost of the entire ventilation fan. Ta.

The present invention solves these problems, and aims to provide an electric shutter opening/closing device for a ventilation fan that has a simple structure, fewer assembly steps, and reduced costs.

Means for Solving the Problem In order to solve this problem, the present invention provides a shutter provided in an opening of an outer frame of a ventilation fan so as to be openable and closable, a connecting rod connected to the shutter, and a connecting rod. A pneumatic shutter opening/closing device is composed of a shape memory alloy connected to one end, a return spring connected to the other end of the connecting rod, and a heater wire that is energized when the ventilation fan motor is energized to heat the shape memory alloy. This is what I did.

Effect: With this configuration, the shape memory alloy changes its memorized shape by heating the shape memory alloy by applying electricity to the heater wire.
In other words, when the connecting rod is lowered to keep the shutter open, the power is turned off, and the temperature drops below a predetermined temperature, the shape memory alloy will return to its original shape under the tension of the return spring. The shutter will be closed again.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is the ventilation fan body, and a plurality of shutters 2
It has a rear opening that can be opened and closed freely. Each shutter 2 is connected to a connecting rod 3. The electric shutter opening/closing device 4 for opening and closing the shutter 2 is constructed as shown in FIG. Several meters of nichrome wire 8 is wound around it, and its outer periphery is coated with an insulating material.

A shape memory alloy 9 that memorizes the shape of the contracted state is disposed inside the vibro, and its lower end is connected to the lower end of a wire connecting fitting 1o that is movable up and down within the vibro.

The wire connecting fitting 10 has an upper end connected to the wire 11. The other end of the wire 11 is connected to the lower end of the connecting rod 3 as shown in FIGS. 2 and 3.

In the electric shutter opening/closing device 4 configured as described above, when the nichrome wire 8 is energized, the nichrome wire 8 generates heat, increases the temperature inside the vibro, and the shape memory alloy 9
When the temperature reaches or exceeds the transformation temperature of , the shape memory alloy 9 enters a contracted state, and the wire connecting device 10 . Wire 11. Connecting rod 3
2 to open the shutter 2 as shown in FIG. On the other hand, when the power is turned off, the nichrome wire 8 stops generating heat, and the inside of the vibro gradually cools down to below the transformation temperature of the shape memory alloy 9. As shown in FIG. is extended and the shutter closes.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, a connecting rod connecting each shutter, a shape memory alloy connected to the lower end of this connecting rod, and a shape memory alloy that is energized when the motor is energized to change the shape as described above. Since the shutter opening/closing device is configured with a heater wire that heats the memory alloy, the structure is simpler than before, with fewer malfunctions, fewer assembly steps, and no adjustment required, reducing costs. This has the effect of being able to.

[Brief explanation of drawings]

Fig. 1 is a perspective view (partially broken section) showing the main parts of an electric shutter opening/closing device for a ventilation fan according to an embodiment of the present invention, and Fig. 2 shows opening of the shutter of a ventilation fan incorporating the electric shutter opening/closing device. 3 is a sectional view showing the shutter when it is closed, FIG. 4 is a perspective view showing the main parts of a conventional electric shutter opening/closing device, and FIG. 5 is an assembled view of the same electric shutter opening/closing device. FIG. 6 is a cross-sectional view showing the shutter of the ventilating fan when it is closed, and FIG. 7 is a circuit diagram of the ventilating fan. 1... Ventilation fan body, 2-... Shutter, 3
...... Connecting rod, 4... Electric shutter opening/closing device, 6... Return spring, 8... Nichrome wire, 9... Shape memory alloy. Name of agent: Patent attorney Toshio Nakao and 1 other person
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Claims (2)

[Claims] (1) A shutter provided in the opening of the outer frame of the ventilation fan so as to be openable and closable, a connecting rod connected to the shutter, a shape memory alloy connected to one end of the connecting rod, and a shape memory alloy connected to the other end of the connecting rod. An electric shutter opening/closing device for a ventilation fan comprising a return spring connected to the heater wire and a heater wire that is energized to heat the shape memory alloy when the motor of the ventilation fan is energized. (2) The electric shutter opening/closing device for a ventilation fan according to claim 1, wherein the heater wire is wound around a cylinder, and the shape memory alloy is provided inside the cylinder.