JPH0418589Y2 - - 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.

<Conventional field> Conventional fire prevention dampers use metal fuses as temperature sensing elements, which melt and release the damper when the temperature exceeds a certain level.When the temperature inside the duct becomes high due to a fire, etc., the metal fuses melt. When the damper is released, the duct is closed by a biasing means such as a spring, weight, or solenoid.

However, since such conventional fire dampers use the metal fuses mentioned above, once the damper is activated, the metal fuses must be replaced each time, which is not only extremely troublesome but also requires a lot of inspection work. I couldn't do it. In addition, there were concerns about reliability, such as failures due to exposure to high temperatures during transportation, or failure to operate at temperatures below the operating temperature, or vice versa. .

Therefore, by using a shape memory alloy that returns to its memorized shape at a certain temperature or higher, a fire prevention damper that can be used repeatedly has been developed, for example.
This method has been proposed in Publication No. 59-41439 and Japanese Utility Model Application Publication No. 58-48262. In these systems, the damper is always biased in the direction of closing the duct using a spring or the like.
An operating lever is provided on the rotary shaft of this damper led out to the outside of the duct, and a connecting rod that retracts into and out of the duct by shape recovery is provided on the shape memory alloy member provided inside the duct, and this connecting rod and the aforementioned operating lever are provided. and are locked at the open position of the duct of the damper. In such a fire damper, when the inside of the duct reaches a predetermined temperature or higher, the shape memory alloy member recovers its shape and pulls the connecting rod into the duct, thereby releasing the lock between the connecting rod and the operating lever. The damper closes the duct using the biasing force of the spring. When the temperature of the duct drops to normal from this state, the connecting rod is pushed out to the outside of the duct by a spring installed inside the duct, and the operating lever is locked to the pushed out connecting rod. It is reset by this.

However, in such conventional devices, the connecting rod is directly locked to the operating lever, and when the damper is closed, the connecting rod is detached from the operating lever and drawn into the duct, so it cannot be reused after the closing operation. For setting, a spring is required that constantly urges the connecting rod toward the outside of the duct and moves the connecting rod toward the outside after the damper is operated, and a member that supports this spring inside the duct. Therefore, by providing such springs and supporting members inside the duct, the ventilation resistance inside the duct increases, and foreign objects passing through the duct are likely to get caught on these springs and supporting members. There was a problem.

<Purpose> The present invention has been made in view of the above points, and is to provide a fire damper in which the ventilation resistance of the duct is low and foreign objects are less likely to get caught.

For this reason, the present invention includes: a damper that opens and closes a duct by its own rotation; an elastic member that biases this damper in the closing direction; and an operating lever that is connected to a rotating shaft of the damper that is led out of the duct. a locking plate that is swingably attached to the outside of the duct and has a locking part that locks the free end side of the operating lever when the duct is opened by the damper; , an elastic member that biases the locking plate in a direction in which the locking portion and the operating lever are locked; one end is connected to the other end of the locking plate, and the other end is inserted into the duct; The connecting rod is slidably supported, one end is fixed to the duct, the other end is connected to the connecting rod inserted into the duct, and the connecting rod is installed in the duct, and the connecting rod is inserted in the case of abnormally high temperature inside the duct. A fire prevention damper is constructed of a shape memory alloy member that recovers its shape by swinging in a direction to release the lock between the locking portion of the locking plate and the operating lever;

As a result, the operating lever is locked by a locking plate provided outside the duct, and the connecting rod is connected to this locking plate, so the shape memory alloy member is connected inside the duct. Since only a portion of the rod is present, there is very little ventilation resistance, making it difficult for foreign objects to get caught.

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

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a front view of the same in operation. 1 to 3, 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. is rotatably supported by the ventilation duct 1 by passing through the outside of the ventilation duct 1, and is always urged in the closing direction by a spring 4 provided at one end of the support shaft 3. At the other end of the support shaft 3, an operating lever 6 that is engaged and released by a locking portion 5a of a locking plate 5 is provided in a protruding manner. This locking plate 5
is rotatably supported by a shaft pin 8 at the tip of a support plate 7 protruding from the outer wall of the ventilation duct 1, with a bias spring 9 at one end and a connecting rod 1 at the other end.
A shape memory alloy spring 11 (hereinafter referred to as an SMA coil) is connected to the bias spring 9 through the spring 0. This bias spring 9 normally biases the locking plate 5 in the direction of locking the operating lever 6 at the locking portion 5a. This serves to prevent the locking from being released due to vibration, and also to rotate the locking plate 5 when the temperature drops after activation, thereby simplifying the return work. The SMA coil 11 is disposed inside the duct 1, and the SMA coil 11 is arranged in the duct 1 when the inside of the ventilation duct 1 reaches a temperature (for example, 70°C) at which the damper 2 should be activated.
℃), the transformation temperature is set so that it transforms into a high temperature phase, and in the high temperature phase, the shape is memorized in a contracted state, and is connected to the protrusion 13 in the ventilation duct 1 and the connecting rod 10 by the crimp terminal 12. ing. Reference numeral 14 denotes arcuate shielding plates provided vertically along the inner circumferential surface of the ventilation duct 1.

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

First, during normal times (when there is no outbreak of fire, etc.)
Since the SMA coil 11 is in the low temperature phase, the locking plate 5
The locking plate 5 has a weak tensile force against the bias spring 9
The operating lever 6 is locked by the elastic force, and the damper 2 is held in the open state (FIGS. 1 and 2).

In this state, due to an outbreak of fire, etc., the ventilation duct 1
When the inside temperature reaches a certain temperature (for example, 70°C) or higher, the SMA coil 11 transforms into a high temperature phase and recovers its shape, generating a tensile force and engaging against the elastic force of the bias spring 9. Rotate the stop plate 5.
When the locking plate 5 rotates, the locking of the operating lever 6 is released, and the damper 2 is rotated by the elastic force of the spring 4 to close the ventilation duct 1 (FIG. 3).

After operation, when the temperature inside the ventilation duct 1 drops,
Since the SMA coil 11 transforms into a low-temperature phase, the tensile force on the locking plate 5 becomes weaker, and the locking plate 5 rotates against the tensile force of the SMA coil 11 due to the elastic force of the bias spring 9. However, since no external force is applied to the operating lever 6, the damper 2 remains closed.

Next, to open the damper 2 once closed,
When the operating lever 6 is manually rotated to the locking portion of the locking plate 5 against the elastic force of the spring 4, the stop arm 6 is locked to the locking plate 5 and the damper 2 is opened.

<Effects> According to the present invention, the connecting rod is operated by the locking plate and the elastic member provided outside the duct to open and close the damper, and the shape memory alloy member and the connecting rod are inside the duct. Since only a portion of the duct is present, the ventilation resistance inside the duct is extremely low, and the possibility of foreign objects getting caught can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view of the embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a front view of the same in operation. 1... Ventilation duct, 2... Damper, 3... Support shaft, 4... Spring, 5... Locking plate, 6...
Operation lever, 7... Support plate, 8... Axis pin, 9...
... Bias spring, 10 ... Connection rod, 11 ... Shape memory alloy spring (SMA coil), 12 ... Crimp terminal, 13 ... Projection, 14 ... Shielding plate.

Claims (1)

[Claims for Utility Model Registration] A damper that opens and closes a duct by its own rotation, an elastic member that biases this damper in the closing direction, and an operating lever that is connected to a rotating shaft of the damper that is led out of the duct. a locking plate that is swingably attached to the outside of the duct and has a locking portion that locks the free end side of the operating lever when the duct is opened by the damper; an elastic member that is connected and biases the locking plate in a direction in which the locking portion and the operating lever are locked; one end is connected to the other end of the locking plate, and the other end is inserted into the duct; One end is fixed to the duct, the other end is connected to the connecting rod inserted into the duct, and the connecting rod is installed inside the duct, and the connecting rod is connected in case of abnormally high temperature inside the duct. A fire damper comprising: a shape memory alloy member that recovers its shape in the direction of swinging the rod to release the lock between the locking part of the locking plate and the operating lever;