JPH0324193Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to the structure of a fire damper that is disposed in a ventilation duct and seals off the duct in the event of a fire or the like.

<Prior Art> In general, ventilation ducts for air conditioning are arranged vertically and horizontally in buildings, etc., but these ventilation ducts are required to be equipped with fire prevention dampers to block the ventilation ducts in the event of a fire or the like. This is to prevent smoke from filling the building through the ventilation duct in the event of a fire, and to extinguish the fire by cutting off the supply of air to the room where the fire is occurring.

Furthermore, once the duct is closed, this damper must be tightly sealed to prevent it from opening again due to fire pressure (convection), etc., and during inspections (testing to see if it is working properly). Once closed, it was necessary to maintain the closed state in order to confirm whether the valve was operating normally.

By the way, conventional fire dampers use a temperature fuse as a temperature sensing element that melts and releases the damper when the temperature exceeds a certain level. The ventilation duct was closed using a biasing means such as the following.

However, since such conventional fire dampers use the above-mentioned temperature fuse, once the damper is activated, the temperature fuse must be replaced and reset each time. Since the ventilation duct is a relatively thin pipe, replacing the temperature fuse is not easy and is extremely troublesome. In addition, this temperature fuse may become defective due to exposure to high temperatures during wheel transport, or may operate at temperatures below the operating temperature, or conversely may not operate at temperatures where it should operate, resulting in reliability problems. That made me feel uneasy.

Further, the conventional fire damper lacks operational stability because no special means for maintaining the open state is provided.

Furthermore, when it comes to air conditioning ducts, it may be necessary to adjust the amount of airflow inside the duct during actual construction at the construction site. was.

Therefore, a plurality of engagement holes are provided at the tip of the contact lever provided in connection with the rotary shaft of the damper, and a heat-sensitive member extending from inside the duct is engaged with one of the engagement holes. A method for adjusting the open state of the damper was proposed in Utility Model Application Publication No. 52-48760.

However, in this conventional type, multiple engagement holes are provided in the joint lever, and the heat-sensitive member is engaged through these holes, so even if the open state of the damper is adjusted at the time of installation, the fire prevention Once the damper has operated, there is a problem in that when the damper is brought into the open state again, there is no way of knowing which position it was previously adjusted to, making readjustment difficult.

<Purpose> In view of the above points, it is an object of the present invention to enable the device to be easily installed at the initially set opening degree without readjusting.

To this end, the present invention includes a damper that is supported by a rotating shaft to open and close the ventilation duct, and a damper that is installed inside the duct and recovers its shape when the temperature inside the duct reaches a certain level and rotates the damper to open and close the ventilation duct. and a shape memory alloy spring for closing the damper, an operating lever is provided connected to the rotating shaft of the damper, the operating lever extends outside the duct, and a magnet is provided at the tip of the operating lever. , A groove corresponding to the length from the position where the damper completely opens the ventilation duct to the position where it closes is provided on the outside of the duct corresponding to the trajectory of the magnet at the tip of the operating lever due to the rotation of the damper, and the inside of this groove is A movable holder made of a magnetic material is provided, and a scale is provided along the groove.

With this, when adjusting the damper opening for the first time, operate the operating lever along the scale mentioned above, and at the desired opening position, move the holder within the groove and join the holder to the operating lever. and fix it. At this time, since the operating lever is provided with a magnet and the holding body is made of a magnetic material, the damper is held at the desired opening degree by the combination of the magnet and the magnetic material.

In this state, when the inside of the duct reaches a predetermined temperature or higher, the shape memory alloy recovers its shape and drives the damper in a direction that closes the duct. The bond between the magnet and the holding material, which is a magnetic material, is released by the shape recovery of the shape memory alloy, and the damper closes the duct.

To open the damper again, the operating lever is operated and the magnet of the operating lever is coupled to the holding body to open the damper. At this time, the holder is fixed in the initial setting, so you can simply connect the magnet to the holder without adjusting it again.
The damper will be installed at the desired opening.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, and FIGS. 3 and 4 are side views thereof.

1 and 2, 1 is a cylindrical ventilation duct, 2 is a damper for opening and closing this ventilation duct, and this damper 2 is located at both ends of a support shaft 3 provided horizontally in the center. ventilation duct 1 by penetrating the section to the outside of ventilation duct 1.
is rotatably supported. Reference numeral 4 denotes a shape memory alloy spring (hereinafter referred to as an SMA coil) installed at the lower part of the duct 1 and on one side of the damper 2. ), the transformation temperature is set so that the material transforms into a high-temperature phase, and the shape is memorized in a contracted state (that is, in the direction of closing the damper 2) in the high-temperature phase. As shown in FIGS. 3 and 4, 5 is an operating lever that is provided on one side of the support shaft 3 that projects outside the ventilation duct 1 and rotates in response to the rotation of the support shaft 3. The operating lever 5 has a bar shape connected in a direction perpendicular to the support shaft 3, and a plate-shaped magnetic force 6 is fixed to the tip of the operating lever 5. 7 is an adjustment mechanism for adjusting the rotation angle of the operating lever 5 connected to the damper 2, and this adjustment mechanism 7 adjusts the opening degree of the damper 2 by regulating the rotation angle of the lever 5. The duct 1
A display board 8 provided on the outside, a groove 9 provided in an arc shape in the display section 8, a scale 10 provided along the groove 9, and a lower part inserted into the groove 9 and placed along the groove 9. A first holder 11 is movably supported with a groove 9 facing the first holder 11.
and a second holder 12 fixed to the end of the holder.

The first and second holding bodies 11 and 12 are both made of a magnetic material such as iron, and are held in a position where they come into contact with a magnet 6 provided on the lever 5 when the lever 5 rotates. Of these, the first
The holder 11 can be moved on the groove 9 by loosening the bolt 13 fixing the holder 11 to the groove 9.

Therefore, the holders 11 and 12 regulate the rotation of the operating lever 5 within the range between the holders 11 and 12, and due to the attraction between the magnet 6 and the holders 11 and 12, the movement shown in FIGS. As shown in the figure, the first holding body 1
The bolt 13 of the first holder 11 operates so as to be held in contact with the first or second holder 12.
The distance between the holders 11 and 12 can be increased or decreased by loosening the first holder 11, sliding the first holder 11 on the groove 9, and holding the first holder 11 with the bolt 13 again.

On the other hand, the damper 2 connected to the lever 5 opens and closes the inside of the duct 1 as the lever 5 rotates. That is, as shown in FIG.
By being held on the side, the damper 2 is connected to the duct 1.
is opened, and the lever 5 is moved to the second position as shown in FIG.
By being held on the holding body 12 side, the damper 2
is for closing the duct 1, and as the first holding body 11 moves, the open state of the damper 2 changes so as to change the amount of airflow inside the duct.

The operation of the fire damper having the above configuration will be explained.

First, under normal conditions (when no fire or the like occurs), the lever 5 is manually rotated toward the first holder 11, and the magnet 6 is attracted to the first holder 11 to be held there. Then, the damper 2 holds the duct 1 in an open state, and since the SMA coil 4 is in a low temperature phase state, the tensile force on the damper 2 is small, resulting in an expanded state, and the damper 2 is held in an open state.

Here, when it is necessary to limit the amount of airflow inside the duct 1 for some reason during air conditioning construction work, loosen the bolt 13 of the first holding body 11 and slide it on the groove 9 to shorten the distance between the holding bodies 11 and 12. do. Then, due to this shortening, the rotation of the lever 5 is regulated by the first holding body 11, so that the damper 2 is held in an oblique state as shown by the dotted line in FIG.

Therefore, when ventilation is performed in this state, the ventilation resistance increases due to the damper 2, and as a result, the amount of ventilation decreases. Therefore, by moving this first holding body 11, it is possible to increase or decrease the ventilation resistance by the damper 2, and as a result, it is possible to increase or decrease the amount of ventilation.

In this state, if a fire occurs and the temperature inside the duct 1 rises above a certain temperature (for example, 70°C), the SMA coil 4 transforms into a high-temperature phase and recovers its shape, thereby resisting the tensile force. This occurs and the lever 5 contracts against the force of the magnet 6 holding it.
When the SMA coil 4 contracts in this way, the damper 2 rotates and the duct 1 is closed, and the rotation of the damper 2 causes the lever 6 to rotate forward so as to be attached to the second holding body 12. come into contact with At this time, the lever 5 is held in this state by the attraction of the magnet 6 to the second holding body 12, and the damper 2 is also held in its closed state.

Therefore, once the duct 2 is closed, the magnet 6
Since the damper 2 is kept in the closed state by the action of
Even if the damper 2 does not generate much tensile force, the closed state of the damper 2 will be maintained, and the damper 2 will not naturally open the duct 1.

Next, to connect damper 2 once closed,
Manually rotate the lever 5 held by the second holder 12 in the vertical direction, and
Let it be adsorbed to. In this way, the damper 2 is held in the state in which the duct 1 is opened by the rotational operation of the lever 6. Therefore, in the above example,
After the damper 2 is activated, the magnet 6 of the lever 5 holds the damper closed unless it is manually reset, so it is very convenient to be able to check whether the damper 2 has activated or not. In addition, in the open state, the damper 2 is held open by the action of the magnet 6, so
Compared to the case where the open state is maintained by a bias spring that biases the damper 2 in the opposite direction to the SMA coil 4, it is extremely stable without flapping due to air blowing, etc., and it is easier to assemble and the number of parts is reduced. However, it is effective and leads to improved reliability.

Moreover, the amount of ventilation inside the duct 1 can be adjusted by the action of the first holder 11, so when it becomes necessary to adjust the amount of ventilation at the construction site, the amount of ventilation can be changed without changing the pipe diameter. Very convenient.

In the above embodiment, the means for holding the damper in the open or closed state was constructed using a magnet, but other mechanical coupling means such as claws or hooks may also be used. It is fine as long as it holds.

<Effects> According to the present invention, a holding means for maintaining the open state of the damper at least in normal times is provided, and an opening adjustment means for arbitrarily setting the opening angle of the damper by this holding means is provided. The amount of ventilation inside the duct can be adjusted by the action of the adjusting means.

Therefore, when it is necessary to change the amount of ventilation when constructing air conditioning ducts, the amount of ventilation can be adjusted by adjusting the opening degree of this damper, so there is no need to change the pipe diameter to adjust the amount of ventilation. This makes construction easier.

In particular, in the case of the present invention, a groove portion corresponding to the length from the position where the damper completely opens the ventilation duct to the position where the ventilation duct is closed is provided on the outside of the duct corresponding to the trajectory of the magnet at the tip of the operating lever due to the rotation of the damper. A holder made of magnetic material that can move within this groove is provided, and a scale is provided along the groove, so when adjusting the damper opening for the first time, adjust the opening along the scale, and after installation, The opening can be easily adjusted to the initially set state by simply moving the operating lever to the position of the holder and connecting the magnets without having to adjust the opening again.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same, and FIGS. 3 and 4 are side views of the same. 1... Duct, 2... Damper, 4... Shape memory alloy spring (SMA coil), 5... Operating lever, 6... Magnet, 7... Adjustment mechanism.

Claims (1)

[Claims for Utility Model Registration] A damper supported by a rotating shaft to open and close a ventilation duct, and a damper installed in the duct to recover its shape and rotate the damper when the inside of the duct reaches a certain temperature or higher. and a shape memory alloy spring for closing the duct, an operating lever is provided connected to the rotation shaft of the damper, and this operating lever extends outside the duct, and a magnet is attached to the tip of the operating lever. A groove corresponding to the length from the position where the damper completely opens the ventilation duct to the position where the damper completely closes the ventilation duct is provided on the outside of the duct corresponding to the trajectory of the magnet at the tip of the operating lever due to the rotation of the damper. A fire prevention damper comprising a holder made of a magnetic material that is movable, and a scale provided along the groove.