JPH0223331Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Purpose of the invention [Field of industrial application] This invention is a fire damper operating device that has an improved operating structure that operates the fire damper when the temperature inside the duct reaches a predetermined temperature. Regarding.

[Conventional technology]

A conventional fire damper operating device using a shape memory alloy spring is known (see Japanese Utility Model Application Publication No. 157361/1983).

This actuating device uses the restoring force of the shape memory alloy spring to slide against the elastic force of the bias spring that presses the sliding shaft in the direction of engagement with the stop arm and the frictional force of the engaging portion between the sliding shaft and the stop arm. The structure is such that the fire damper is operated to close by sliding the moving shaft in the release direction.

[Problem that the invention attempts to solve]

However, in the above device, when operating a large fire damper placed in a factory etc., the frictional force becomes quite large, so the shape memory alloy spring is used to generate the force to resist this force. Judging from performance, this may not be possible. In addition, it is said that a fire damper used for air conditioning in ordinary homes requires a force of 6 kg to resist the frictional force, and in order to create a shape memory alloy spring that can generate this much force, the diameter of the strands would have to be thick. The manufacturing cost is high, and when the wire diameter is large, the elastic force of the shape memory alloy spring becomes large even in the low temperature phase, so it is difficult to set the elastic force of the bias spring.

This idea was made in view of the above circumstances,
Its main purpose is to use a regular spring to remove the sliding shaft from the stop arm, and a shape memory alloy spring to release the lock from the sliding movement of the sliding shaft. The purpose is to enable fire dampers of various sizes to be operated to close using springs.

(b) Composition of the invention This invention is a fire damper operating device,
A release spring is provided in the case that can press the sliding shaft in the opposite direction to the stop arm side and release the engagement between the sliding shaft and the stop arm, and the sliding shaft and the stop arm are engaged with the sliding shaft in the duct. In the fitted state, a protrusion is provided that protrudes into the duct from an opening provided in the case cylindrical wall in the duct, and the protrusion connects the opening with the sliding shaft by sliding movement of the sliding shaft. The sliding shaft is formed to be able to move along the cylindrical axis of the case until it is disengaged from the stop arm, and is further engaged with the protrusion on the case cylindrical wall in the duct to lock the sliding shaft in engagement with the stop arm. A stopper piece is mounted around the protrusion between the stopper piece and the sliding shaft, and one or more shapes that push up the stopper piece to remove it from the protrusion when the temperature inside the duct reaches a predetermined temperature or higher. It is equipped with memory alloy springs.

That is, in this invention, when the temperature inside the duct exceeds a predetermined temperature, the shape memory alloy spring recovers and stretches to a memorized state, removes the stopper piece from the protrusion, and closes the fire damper.

〔Example〕

This invention will be explained in detail below based on FIGS. 1 to 4. Note that this invention is not limited to this.

FIG. 1 is a partial sectional view of the fire damper actuating device 1. FIG. Reference numeral 2 denotes a cylindrical duct, and a spring 3 is installed inside this duct to provide ventilation passage 4 of the duct 2.
A plate-shaped fire damper 5, which is biased in the direction of closing the area, is rotatably mounted. A rotation shaft 6 of the fire damper 5 is provided with a stop arm 7 extending from the shaft to the outside of the ventilation duct 2. 8
is a cylindrical case installed from the outside of the duct 2 to the inside through its body wall, and inside this case,
A sliding shaft 9 is slidably housed. The end of this sliding shaft 9 outside the duct 2 is the stop arm 7.
A coil-shaped release spring 11 is installed between the threaded portion 10 at the left end of the case 8 and the stopper jig 10 of the sliding shaft 8. is being pushed to the right by

A screw 12 is fixed to the outer surface of the cylindrical wall in the duct 2 of the case 8, and a plate-shaped stopper 13 is attached to the screw so as to be movable in the vertical direction facing right. On the other hand, the sliding shaft 9 has a ring 14 on its outer peripheral surface below the right end side of the stopper 13.
A protrusion (pin) 15 is fixed to protrude into the duct 2 from an opening 16 provided in the cylindrical wall of the case 8 in the duct 2, and the opening 16 is connected to the protrusion 1.
The stop arm 5 is formed into an elongated hole shape so that the stop arm 5 can be moved along the cylindrical axis of the case 8 until the sliding shaft 9 and the stop arm 7 are disengaged from each other. The pin 15 passes through the center of the ring 14 and vertically through the sliding shaft 9, and when the sliding shaft 9 and the stop arm 7 are engaged, the pin 15 is inserted into the stopper 13.
It projects upward from the sliding shaft 9 so as to engage with a hole 17 drilled near the right end, and the pin 15 and ring 1
The lower end of a coiled shape memory alloy spring 18 inserted through a pin 15 is caulked to the outer peripheral surface of the sliding shaft 9 between the slide shaft 9 and the slide shaft 9 . The above state is shown in FIGS. 3 and 4. The spring 18 is a unidirectional shape memory alloy spring that stores its elongated state in a high temperature phase higher than a predetermined temperature, and its wire diameter is 0.5 to 2.
mm, and its transformation temperature, that is, the predetermined temperature, is, for example, 70°C. Moreover, the spring 18 is not limited to this, and may of course be a bidirectional shape memory alloy spring.

Next, the operation of the above device will be explained.

First, under normal conditions (when there is no fire), when set to the state shown in Figure 1, the shape memory alloy spring 18 is in a low temperature phase, so the stopper 13 is not pressed, so the fire prevention damper 5 is opened. held in state.

Next, when the temperature inside the duct 2 reaches the predetermined temperature, the shape memory alloy spring 18 assumes the elongated shape of the high temperature phase, and as shown in FIG.
push up. And stopper 13 is pin 15
When the sliding shaft 9 is released from the housing, the sliding shaft 9 moves to the left by the force of the release spring 11 until the stopper jig 10 hits the case 8, thereby releasing the locking of the stop arm 7.
As a result, the fire damper 5 is closed by the spring 3. Thereafter, even if the temperature inside the duct 2 falls, the fire damper 5 maintains the closed state.

In order to open the fire damper 5 that has been once blocked, the stop arm 7 is manually rotated against the elastic force of the spring 3, and the right end of the sliding shaft 9 is rotated against the elastic force of the release spring 11. The pin 15 may be engaged with the hole 17 of the stopper 13 by pressing.

(c) Effects of the invention This invention is configured to release the locking of the sliding shaft by the restoring force of the spring made of shape memory alloy, and to move the sliding shaft by the release spring and remove it from the stop arm. (a) A small shape memory alloy spring with low recovery force can be used, thereby reducing the cost of the device and shortening the time required for the fire damper to close.

(b) The shape memory alloy spring does not need to be replaced every time the fire damper is closed, and can be used multiple times, improving cost performance.

(c) Periodic inspection is possible, which not only improves operating temperature accuracy but also greatly improves reliability.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a fire damper in an open state showing an embodiment of the fire damper actuating device according to this invention, Fig. 2 is a partial sectional view of main parts showing this closed state, and Figs. 3 and 4 are They are an explanatory sectional view and a perspective view of the main part. 1... Fire damper operating device, 2... Duct,
3... Spring, 4... Ventilation path, 5... Fire damper, 6... Rotating shaft, 7... Stop arm, 8...
...Case, 9...Sliding shaft, 11...Release spring, 1
3...Stopper, 15...Pin (protrusion), 16
...Opening, 18...Spring made of shape memory alloy.

Claims (1)

[Scope of Claim for Utility Model Registration] A plate-shaped fire prevention damper for blocking the ventilation passage which is rotatably attached in the duct and biased in the direction of closing the ventilation passage by a spring, and the rotation of this fire prevention damper. A cylindrical case attached to the duct so as to penetrate the body wall of the duct from inside the duct and open to the outside of the duct, a sliding shaft slidably housed in this case, and a fire damper. A stop arm that extends from the rotating shaft to the outside of the duct and engages with the protrusion when the sliding shaft protrudes from the end opening of the case outside the duct to lock the fire damper in the ventilation passage open position. In a fire prevention damper actuating device equipped with When the sliding shaft and the stop arm are engaged with the shaft, a protrusion is provided that protrudes into the duct from an opening provided in the cylindrical wall of the case in the duct. The stop arm is formed so that it can move along the cylindrical axis of the case until the sliding shaft and the stop arm are disengaged by sliding movement, and further engages with the protrusion on the case cylindrical wall in the duct and slides. A stopper piece is installed to lock the shaft in engagement with the stop arm, and the stopper piece is installed around the protrusion between the stopper piece and the sliding shaft when the temperature inside the duct exceeds a predetermined temperature. A fire prevention damper actuating device comprising one or more springs made of a shape memory alloy that push up the springs to remove them from the protrusions.