JPS6240604Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a fire prevention damper that automatically closes the duct by utilizing the deformation of the shape memory metal member when the temperature inside the duct rises due to a fire and reaches a predetermined temperature. Regarding equipment.

The inventors of the present application have developed a fire prevention damper opening/closing device of this type using shape memory metal, for example, as shown in FIG. Rotating spring 4 installed at the end
The rotating shaft 2, which is biased in the closing direction by the duct 1, is held in the open position by the engagement of the stopper pin 7 with the stop arm 6.
It is biased by a spring 10 housed in a cylinder 9 extending inward, and this spring 1
A shape memory metal member 11 having a coil spring shape is housed in the rear part of the duct 1, and an opening 12 allows air to enter the duct 1 into the shape memory metal member 11. When the temperature rises and reaches a predetermined temperature, the shape memory metal member 11 expands into a predetermined shape, pulls in the stopper pin 7 to release the engagement with the stop arm 6, and causes the rotational spring 4 to rotate the rotational shaft 2. A device is proposed which is actuated to drive the vanes 3 into a closed position perpendicular to the passage in the duct 1.

However, in the above device, the damper is operated by releasing the locking of the rotating shaft 2 due to the deformation of the shape memory metal member 11 when it reaches the set temperature. There were problems in that the structure was complicated and the cost was likely to be high.

The present invention was developed focusing on the above-mentioned problems, and in order to simplify the damper operating mechanism by using a shape memory member, the blade fixed to the rotating shaft can be moved to the open position by an auxiliary spring. and when the temperature inside the duct reaches a predetermined temperature, the shape memory metal member is deformed to rotate the rotating shaft against the auxiliary spring to hold the blade in the closed position. The purpose is to solve problems.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention. First, to explain the configuration, a damper side plate 1 has ducts 1 located on both sides fixed by flanges 18.
6, rotary shafts 20a and 20b are rotatably mounted to bearings provided on a bearing frame 29 (see FIG. 3).
Wings 21a and 21b are fixed to each of b with fixing fittings 22a and 22b, respectively. Further, the blades 21a and 21b are connected to each other by a link 24, a pin 26, and a connecting rod 25, and the blades 21a and 21b are configured to be rotated in conjunction with each other. Further, a receiving member 23 is fixed to the damper side plate 16 in order to position the blades 21a and 21b when they are rotated to a position perpendicular to the direction of the duct 1.

A shape memory metal member 27 that shrinks to a pre-memorized shape at a predetermined temperature is installed between the blade 21a located below and the damper side plate 16, and a rotating shaft 20a to which the blade 21a is fixed has a shape-memory metal member 27 that will be explained later. As shown in Figure 2, an auxiliary spring is provided that biases the rotating shaft 20a in the direction shown by the arrow A, and in normal times when the temperature inside the duct 1 is normal, the rotating shaft 20a pushes the blade 21a into the duct 1. It is in an open and held state in which it abuts against a stopper pin 28 that is positioned parallel to the path of the pipe. The holding of the blade 21a in the released state by such an auxiliary spring is also transmitted to the blade 21b provided at the upper part with the link 24 and the connecting rod 25, and the blade 21a is held in the released state by the auxiliary spring.
a and 21b are each held at a released position parallel to the passage of the damper 1. In this state of being held in the released position, the shape memory metal member 27 is in an extended state as shown in the figure, and simply maintains the extended shape, and no deforming force that would rotate the blade 21a is generated.

Figure 3 shows A-A of the damper opening/closing device shown in Figure 2.
The blade 21a is fixed to the rotating shaft 20a by welding a fixing fitting 22a, etc., and both ends of the rotating shaft 20a are rotatably supported by bearing metals 30 attached to a bearing frame 29. ing. One end of such a rotating shaft 20a protrudes from the duct side plate 16 and extends to the outside.
A spring fixing shaft 33 is externally mounted on the protrusion of the rotary shaft 20a and is fixed by screwing in an embedded bolt 34, and a spirally wound plate that operates as an auxiliary spring is inside the cover 30 provided on the protrusion of the rotating shaft 20a. A spring 31 is built-in, and a leaf spring 3
The outer end 31a of the leaf spring 31 is fitted into a slit provided in the cover 30 and fixed, and the inner end 31b of the leaf spring 31 is fitted into a pin 32 implanted in a spring fixing shaft 33 to rotate. It is fixed to the shaft 20a.

Next, the operation of the present invention will be explained.

First, under normal conditions when the temperature inside the duct 1 is at room temperature, the blade 21a is biased in the direction of arrow A shown in FIG. Been stopping pin 2
8, that is, the release position where the blades 21a are parallel to the direction of the passage of the duct 1. At this time, the shape memory metal member 27 is in the extended state shown in FIG. 2, and there is no deformation force. It has not occurred. Of course, when the vane 21a is held in the released position, the vane 21b provided at the top via the link 24 and the connecting rod 25 is also held in the released position parallel to the passage of the duct 1.

Next, the temperature inside duct 1 rises due to a fire, etc.
When the temperature inside the duct 1 reaches a so-called memory setting temperature at which a predetermined shape is memorized in the shape-memory metal member 27, the shape-memory metal member 27 resists the spring force of the leaf spring 31 as an auxiliary spring to maintain the pre-memorized shape. As shown in FIG.
The end of the blade 1a is rotated and held in the closed position, and at the same time, the blade 2 is connected via the link 24 and the connecting rod 25 in conjunction with the rotation of the blade 21a.
1b is also rotated and held in the closed position perpendicular to the direction of the passage of the duct 1, and when the temperature inside the duct 1 reaches the memorized set temperature of the shape memory metal member 27, the damper device will automatically operate and close the inside of the duct.

The holding force due to the operation of the shape memory metal member 27 shown in FIG. It has been obtained.

On the other hand, if the temperature inside the duct 1 returns to a constant temperature after operating to the closed state shown in FIG. The rotation shaft 20a is rotated in the direction shown by the arrow A by the spring force 31, and is again held in the released state shown in FIG. Therefore, even if the damper opening/closing device of the present invention is activated due to a fire, etc., recovery after activation will be performed automatically, and unlike conventional damper opening/closing devices, you will have to go to the site and carry out restoration operations after activation. There is no need to do so.

In addition, although the above-mentioned embodiment took as an example a device equipped with a pair of blades in the duct, the same applies to a device having a single blade.

As explained above, according to the present invention, an auxiliary spring attached to one end of the rotating shaft holds the blade fixed to the rotating shaft provided in the duct in the released position parallel to the duct passage under normal conditions. , is attached between the vane and the damper side plate, and when the temperature inside the duct reaches a predetermined temperature, it deforms into a pre-memorized shape against the spring force of the auxiliary spring and rotates the vane at right angles to the duct passage. Since the damper opening/closing mechanism includes a shape-memory metal member that closes and holds the duct closed, the shape-memory metal member serves both as a means for detecting the temperature inside the duct and as a drive means for operating the damper based on this temperature detection. Therefore, the mechanism for operating the damper in the open state to the closed state becomes extremely simple, and the cost of the device can be significantly reduced. Furthermore, even if the damper device is once activated to the closed position, once the temperature inside the duct returns to normal temperature, the operating force from the shape memory metal member will disappear.
Since the damper is automatically operated to the release position by the auxiliary spring, there is no need to restore the site after the damper is operated, and the damper device can also be easily maintained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a fire prevention damper device using shape memory metal that has already been proposed by the present inventors, Fig. 2 is an explanatory diagram showing one embodiment of the present invention, and Fig. 3 is FIG. 4 is an explanatory view showing the operating state of the present invention. 1... Duct, 16... Damper side plate, 18...
Flange, 20a, 20b...rotating shaft, 21a,
21b...Blade, 22a, 22b...Fixing metal fittings,
23...Receiving member, 24...Link, 25...Connection rod, 26...Pin, 27...Shape memory metal member, 28...Stopper pin, 29...Bearing frame,
30... Bearing metal, 31... Leaf spring, 82...
Pin, 33... Spring fixing shaft, 34...
...Embedded bolt.

Claims (1)

[Scope of utility model registration request] an auxiliary spring attached to one end of the rotating shaft for holding a blade fixed to a rotating shaft provided in the duct in an open position parallel to the duct passage under normal conditions; and an auxiliary spring installed between the blade and the damper side plate; When the temperature inside the duct reaches the specified temperature,
A fire prevention damper opening/closing device comprising a shape memory member that deforms into a pre-memorized shape against the spring force of the auxiliary spring and rotates the vane at right angles to the duct passage to close and hold it.