JPS61295455A - Fire preventive damper - Google Patents

Abstract

PURPOSE:To make it possible to secure the stability of the breaking operation of the damper, to remove a weight, to reduce the ventilation resistance of a vent passage and to mount the fire preventive damper in every direction, by providing two dampers openable in a hinge opened state within a cylindrical frame forming a vent passage and engaging a thermal deformation member made of a shape memory alloy with the damper. CONSTITUTION:Two dampers 4 supported by a shaft 6 in a hinge opened state and formed by half cutting a disc which opens or closes a vent passage 2, are provided in a frame body 1. A thermal deformation member 3 made of a shape memory alloy in the form of being folded into two parts is secured to the shaft 6 by means of a fastening screw 7, and both end pieces of the thermal deformation member are secured to the outer surface of the two dampers 4. When extraordinary high-temperature air makes ingress into the vent passage 2, the thermal deformation member 3 is deformed so as to form a plane, and two dampers 4 secured to the thermal deformation member 3 are hinged to open at an angle of 180 deg. around the shaft a secured to the frame 1 to interupt the vent passage 2.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is installed in a portion that penetrates a fireproof compartment that is designed to minimize fires, etc., as stipulated by the Building Standards Act, etc., to prevent the spread of fire in the event of a fire. This relates to fire dampers for use in fire protection.

BACKGROUND OF THE INVENTION Conventionally, this type of fire damper has generally had a configuration as shown in FIG. 4, although no specific literature can be cited. That is, it is equipped with a cylindrical frame 11 with both ends open to form a ventilation passage 12, and a Danno:-14 that opens and closes the ventilation passage 12 is rotatably supported within the frame 11 by a shaft 16. A temperature fuse 13 is provided between one end of the damper 14 and the frame 11, and the damper 14 is normally held horizontally.

Note that a weight 1) 15 is placed on the other end of the damper 14. Further, a flange 17 is provided on the frame 11 in order to fix the equipment to the wall surface through which the duct passes.

With this configuration, when the air flowing through the ventilation passage 12 becomes abnormally high temperature due to a fire outbreak, etc., the temperature fuse 13 is blown, the damper 14 is rotated by the weight 16 about the shaft 16, and the ventilation passage 12 is blocked. It was something that

Problems to be Solved by the Invention In such a conventional configuration, the reliability of the operation of the mechanism is not only questionable due to variations in the mounting position and operating temperature of the temperature fuse 13, but also the temperature sensing of the temperature fuse 13 Since the part is made of a eutectic alloy, its durability is extremely problematic, and if it is left in a ventilated area for several years after being installed, the eutectic alloy deteriorates and it no longer operates at the set operating temperature. There is a risk that it will not happen. Also, damper 1
Since the weight 15 that activates the weight 15 must be attached, the ventilation resistance loss is also large, and the device can only be installed in the direction in which gravity acts on the weight 16, that is, in a position where the frame 11 is horizontal. I couldn't get over it.

The present invention is intended to solve these problems.

The purpose is to ensure the stability of the damper's shutoff operation, eliminate the need for a weight, reduce ventilation resistance in the ventilation path, and furthermore make it possible to install the fire damper in any direction.

Means for Solving the Problem In order to solve this problem, the present invention provides two dampers that can be opened in a butterfly shape inside a cylindrical frame forming a ventilation passage, and the dampers have shape memory. A thermally deformable alloy body is engaged.

Function: With this configuration, when the air passing through the ventilation path reaches an abnormally high temperature, the two dampers are opened by the deformation of the heat deformable body, that is, the two dampers are deformed so that they form a single plane. This ensures that the shutoff operation is performed reliably.

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

In the figure, reference numeral 1 denotes a cylindrical frame body, which is open at both ends to form a ventilation passage 2 . In the frame 1, there are provided two dampers 4 which are supported by a shaft 6 so as to be freely butterfly-openable, and which are made by dividing a circular plate into half for opening and closing one ventilation passage 2. A thermally deformable body 3 made of a shape memory alloy in a folded shape is fixed to the shaft 6 with fixing screws 7, and both end pieces of the thermally deformable body 30 are fixed to the outer surfaces of the two dampers 4.

Note that 6 in the figure is a flange provided on the frame 1 in order to fix the equipment to the wall surface through which the duct passes.

In the above configuration, when abnormally high temperature air A enters the ventilation passage 2, the thermally deformable body 3 deforms to form one plane as shown in FIG. 4 is butterfly-opened at 1800 around a shaft 6 fixed to the frame 1 to block the ventilation path 2.

In the embodiment, a cylindrical frame and a half-disc-shaped damper are used, but the frame may also be a rectangular tube, and in this case, the damper has a shape that matches this.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, by opening and closing the damper using a shape memory alloy, it is possible to eliminate parts such as weights that reduce the area of ventilation passages, and the ventilation resistance is reduced. This has the effect of reducing loss, significantly improving the durability of the damper's cutoff mechanism, and allowing equipment to be mounted in any direction.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a fire damper according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of the damper and thermally deformable body of the fire damper, and Fig. 3 is a diagram showing the state of change in shape of the thermally deformable body. The perspective view and FIG. 4 are front views showing a conventional fire damper. 1... Frame body, 2... Ventilation duct, 3...
...thermally deformable body. 4...damper, 6...shaft. Name of agent: Patent attorney Toshio Nakao and one other person
Naiha taste

Claims (1)

[Claims] A cylindrical frame body forming a ventilation passage, and two dampers that are pivotally supported by a shaft inside this frame body and can be freely opened in the shape of a butterfly are provided, and a thermally deformable body made of a shape memory alloy is attached to the dampers. A fire damper that is engaged.