JPH0510828Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fire damper that rotates a shutter and closes a passage in a duct when the temperature inside the duct reaches a predetermined temperature.

Some conventional fire dampers already use shape memory alloy springs as temperature sensing members for fire protection. (For example, Utility Model Application Publication No. 57-157361,
(No. 61-103156) However, since the conventional fire damper has a large number of components and its structure is complicated, the failure rate itself is high, and temperature sensing using shape memory alloys is difficult to ensure. However, there was a problem in that even if the shutter was strong, it could not be sufficiently effective in closing the shutter, and improvements were needed in this regard.

Furthermore, the number of component parts and the complexity of connecting the parts make the product expensive.

The purpose of this invention is to provide a fire damper which completely solves the problems and drawbacks of the conventional fire damper and which can be completed as a more complete fire damper.

That is, this invention consists of a duct 1, a rotating shaft 5 rotatably provided to the duct so as to cross the inside of the duct, a shutter 2 integrally fixed to the rotating shaft, and the rotating shaft 5. and an engagement formed at the end of a cylindrical member provided concentrically at a portion of the rotating shaft protruding outward from the duct of the shutter. 3 and a handle 14 attached to an end of the rotating shaft, and one end of the rotating mechanism is fixed to the inside of the duct outside the rotation range of the shutter so that the handle 14 is close to the engaging part. a support rod 7, which is pivoted such that its proximal end intersects near one end adjacent to the locking portion of the support rod, and an operating rod 9 disposed outside the rotation range of the shutter; A locking protrusion 8 that penetrates the body wall of the duct and is provided at the base end of the operating rod so as to engage and disengage from the locking portion according to rotation of the operating rod; A shape memory alloy 1 in the shape of an elastic spring stretched between the tip and the other end of the support rod.
0, so that when the shape memory alloy contracts or expands while the locking protrusion is engaged with the engagement part, the locking protrusion is removed from the engagement part. and a lid opening holding mechanism that allows the shutter to close the duct.

Examples will be described in detail below with reference to the drawings.

FIG. 1 is a front view of this invention, FIG. 2 is a plan view of the duct with the lid open, and FIG. 3 is a cross-sectional view of the main parts, with the position of the operating rod in the open state shown by chain lines.

The duct 1 is provided with a stopper 11 on the inner periphery so that the shutter 2 closes the inside of the duct at a predetermined position, and a through hole through which a rotation shaft 5 (described later) passes through the center of the duct 1 is provided oppositely. A hole through which a locking protrusion 8 of an operating rod 9 (described later) passes is bored in the vicinity of the through hole.

The shutter 2 is connected and fixed to be integrated with the rotation shaft 5, and operates together with the rotation of the rotation shaft 5. The rotation mechanism 6 closes the rotation shaft 5 passing through a through hole in the body wall of the duct 1 and the shutter 2 to be connected to the tip of this rotation shaft, that is, the portion penetrating the outside of the duct 1. The spring 12, which is the biasing means 4 for rotating in the direction of the lid, and the base end of the rotation shaft 5, that is, the spring 12 are fitted into the opposing portion of the duct 1 protruding outside in order from the base end, and a handle receiver 13 whose tip is in contact with the duct body wall;
It consists of a handle 14 for opening the lid of the shutter 2 which is connected to this and integrally connected to the rotation shaft.

To explain the handle receiver 13 and the lid opening handle 14 in more detail, the former has a collar integrally formed at the base end of a cylindrical body, and a U-shaped engagement portion 3 is cut out at the tip of the cylindrical body. The inner diameter of the proximal end is formed to a diameter that allows the rotation shaft 5 to fit therein.

An air volume adjustment hole 15 is bored in the collar, and an air volume adjustment memory is engraved on the opposite side of the hole.

Next, the latter consists of a cylindrical body that fits into the rotation shaft 5, and a handle part 16 that is integrated with the outer periphery of this body, and this handle part 16 for opening the lid.
4 connects and fixes the handle part 16 to the handle receiver 13 at an appropriate position in the air volume adjustment hole 15, and also connects and fixes the handle part 16 to the rotating shaft 5 by passing a bolt through the side of the body from the side of the body. They are integrated by bringing them into contact. The support rod 7 has a connecting portion 17 that connects one end of the spring-like shape memory alloy 10, a fixing portion 18 to the duct 1 whose base end is bent into a substantially L shape, and a connecting portion proximal to the fixing portion 18. It consists of a pivot portion 19 of the operating rod 9 projecting from the lower part of the portion 17,
The pivot portion 19 is connected to a connecting portion 17' of the operating rod 9, which will be described later.
Connecting portion 17 so that the connecting portion 17 and the connecting portion 17 do not overlap.
The lower part is slightly bent so that the pivot portion 19 protrudes. The operating rod 9 has a connecting part 17' connecting the other end of the spring-like shape memory alloy 10, and the pivoting part 19.
It consists of a pivot part 19' for pivotally attaching the base end to the duct 1, and a locking protrusion 8 protruding from the side surface of the base end. Said pivot portion 1 to be locked to the engaging portion 3 of the tool 13
9' is pivotally connected to the pivot part 19, and the connecting part 17' has a locking protrusion that engages with the engaging part when the spring-like shape memory alloy 10 rotates the shutter in the direction of opening the lid in the low temperature phase. A return spring 20 rotates the operating rod 9 to stop.
is energized by

The shape memory alloy 10 has an elastic spring shape and is stretched in the forward direction of the connecting portions 17, 17', and it is determined whether the shape in the high temperature phase is contracted or expanded. If the locking projection 8 is optionally retracted, the locking protrusion 8 will operate in the direction of the chain line in FIG. Become. Because of the above-mentioned effect, the shape memory alloy may be made entirely of memory alloy or only part of it may be made of memory alloy.

Reference numeral 21 in the drawings is a pivot fitting, 22 is a fastening fitting, and 23 is a cap surrounding a cylindrical body that should prevent the engaging part 3 of the handle receiver 13 from coming out. It has a gap in which the locking protrusion 8 can be accommodated. 24 is a connecting fitting, 25 is an inspection port, and 26 is fixed to the duct 1 with a cap of the biasing spring 12.

Next, the operation of this invention will be explained.

Under normal conditions, when no fire has occurred, the shape memory alloy 10 is in a low temperature phase as shown by the solid line in FIG. The shutter 2 maintains an open state with respect to the duct 1.

Next, when a fire occurs and the temperature inside the duct 1 rises, causing the spring-like shape memory alloy 10 to enter a high-temperature phase, the shape memory alloy 10 shrinks and returns to its original state, and at the same time the operating rod 9 moves to the pivot fitting 21. The locking protrusion 8 is removed from the engaging portion 3.
As a result, the rotation shaft 5 rotates due to the biasing force of the spring 12, and the shutter 2 rotates in the direction of opening the duct 1 and comes into contact with the stopper 11, thereby closing the passage of the duct 1. It will be kept at.

When the fire is extinguished, the temperature of the spring-like shape memory alloy 10 becomes a low temperature phase, allowing it to be in an elongated state, and in this state, the operating rod 9 becomes rotatable due to the biasing force of the return spring 20.

When the handle portion 16 of the shutter 2 is rotated in the direction in which the lid should be opened and the engaging portion 3 reaches the position of the locking protrusion 8, the operating rod 9 is simultaneously moved by the return spring 20 to the position of the pivot fitting 21. The locking protrusion 8 locks on the engaging portion 3. In this state, the shutter 2 will again hold the duct open against the force of the spring 12.

Incidentally, the air volume of the duct can be adjusted while the shutter 2 is open.

The operation of this invention has been described above, and the effects will be described below.

As is clear from the above, the number of components of this invention is small, and the connection is extremely simple, so the failure rate is extremely low, so the reliability of temperature sensing by shape memory alloy is superior to that of other structural components. Rather than being cut off due to a failure, the system can be inherited down to the shutter lid closing operation, and the manufacturing process of this invention is simple, which has resulted in cost reductions.

Furthermore, the engaging portion 3 is provided on the handle receiver 13 that is fitted into the rotating shaft 5, but when the locking protrusion 8 is engaged with the engaging portion 3, the handle receiver 13 cannot rotate. Therefore, in this state, it is possible to select where to connect and fix the lid opening handle 14 to the air volume adjustment hole 15, and the fact that the air volume of the duct 1 can be adjusted is also a sign of the high reliability of the fire prevention effect of the shape memory alloy. The quality of the fire damper has been further improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the present invention, Fig. 2 is a plan view of the duct with the lid open, and Fig. 3 is a sectional view of the main parts. DESCRIPTION OF SYMBOLS 1... Duct, 2... Shutter, 3... Engaging portion, 4... Urging means, 5... Rotating shaft, 6... Rotating mechanism, 7... Supporting rod, 8... Locking protrusion , 9... Operating rod, 10... Shape memory alloy.

Claims (1)

[Claims for Utility Model Registration] A duct, a rotating shaft rotatably provided to the duct so as to cross the inside of the duct, a shutter integrally fixed to the rotating shaft, and a shutter that is integrally fixed to the rotating shaft; and an engaging portion formed at the end of a cylindrical member provided concentrically at a portion of the rotating shaft protruding outward from the duct of the shutter. and a handle attached to the end of the rotation shaft, and a support fixed to the inside of the duct outside the rotation range of the shutter so that one end thereof is close to the engaging part. a rod, an operating rod that is pivotally mounted so that its base end intersects near one end adjacent to the locking portion of the support rod, and that is located outside the rotation range of the shutter; and a body wall of the duct. a locking projection provided at the base end between the actuators so as to penetrate through the actuator and engage with and disengage from the locking portion in accordance with the rotation of the actuator; The shape memory alloy is formed into a triangular shape with a shape memory alloy in the form of an elastic spring stretched between the ends, so that the shape memory alloy does not contract or expand when the locking protrusion is engaged with the engagement portion. A fire prevention damper comprising a lid opening holding mechanism that causes the shutter to close the duct by disengaging the locking protrusion from the engaging portion when the shutter is moved.