JPH0623300Y2 - Fire damper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fire-prevention damper that automatically rotates a shutter to close the duct when the temperature in the duct reaches a predetermined temperature.

[Prior Art] For such a fire damper, there has been a fire damper that automatically locks the closed state of the shutter when the shutter is closed to prevent the shutter from opening due to strong wind. The lock mechanism was attached only to the handle of the components that make up the rotation mechanism.

For this reason, in this device, when the duct is opened from the closed state, the lock release operation and the shutter rotation operation are different operations, and there is a troublesome point that must be performed in stages.
Further, there is a problem that the shutter is rotated without being unlocked, and the lock mechanism is damaged.

[Problems to be Solved by the Invention] The object of the present invention is to completely solve the problems of the prior art and to provide a fire damper capable of performing the conventional two-step operation with one touch and extremely lightly. .

[Means for Solving the Problem] That is, according to the present invention, in the rotating mechanism (3) for rotating the shutter (2) of the duct (1), the shutter (2) has the duct (1).
In a fireproof damper provided with a lock mechanism (4) that should prevent the shutter (2) from rotating when the shutter (2) is closed, the rotation mechanism (3) is a rotating mechanism that connects and fixes the shutter (2). The moving shaft (5) and the duct of the rotating shaft (5)
The handle (6) is provided on the base end side protruding from (1) so as to be rotatable around the axis of the rotating shaft (5), and the lock mechanism (4) includes the rotating shaft ( A lock pin (7) slidably fitted in a fitting hole (21) provided in the diametrical direction on the base end side of (5) and urged in the direction in which the tip projects from the fitting hole (21). , The locking hole (2
7) having a sleeve (8) fixed to the duct (1) concentrically with the rotating shaft (5), and a direction in which the lock pin (7) is pulled out from the locking hole (27). And the lock pin (7) when the handle (6) is not operated.
Direction in which the lock pin (7) is removed from the locking hole (27) when the handle (6) is operated in the direction to close the duct (1) without being pressed by the pressing plate (9). The pressing plate (9) is fixed to the rotating shaft (5) at one side of the lock pin (7), is connected to the handle (6) at the other side, and the lock pin (7) is at the middle part. The present invention relates to a fireproof damper that can be engaged with.

[Operation] In the fire damper having such a configuration, the tip of the lock pin is always in contact with the inner surface of the sleeve when the shutter is open. When the shutter is rotated by the rotating mechanism, the tip of the lock pin slides on the inner surface of the sleeve to close the duct and simultaneously engage with the locking hole. Therefore, once the shutter that closed the inside of the duct is locked in that position,
Will not rotate due to wind pressure. When the handle is rotated in the shutter open direction from the closed state, the pressing plate first pulls the lock pin, the tip of the lock pin is removed from the locking hole, and then the rotary shaft is rotated in the shutter open direction. . In this way, the locking action is released prior to the turning of the turning shaft.

[Embodiment] Next, the present invention will be described according to the following embodiments.

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is an exploded perspective view of essential parts, and FIGS. 4 to 7 are locking mechanisms. FIG. 4 is a cross-sectional view showing the main parts of the duct in the order of passage from the passage closed state to the opened state of the duct.

The fire damper (D) shown in Fig. 1 is a cylindrical duct (1).
And a disk-shaped shutter for opening and closing the duct
(2), a rotation mechanism (3) that rotates the shutter, a trigger mechanism that locks the shutter (2) in the open state until a fire occurs, and releases the lock when a fire occurs, and optionally a shutter
An inspection mechanism (14) for closing (2) is provided.

The duct (1) has a stopper (10) on its inner circumference so that the shutter (2) can be closed at a position perpendicular to the duct. Further, as shown in FIG. 2, a pair of through holes (5a), (5b) for supporting the rotating shaft (5) of the rotating mechanism (3) for rotating the shutter (2) is formed in the peripheral wall. Opposite. At a position near one of the through holes (5b) (on the right side in FIG. 2), the engaging projection (19) of the actuating rod (11) of the trigger mechanism (T) penetrates the duct (1) to be actuated. There is an opening in.

Further, an inspection port (13) for inspecting whether the shutter (2) is open or closed is projected outside the duct (1). This inspection port
In (13), the operating rod (11) is pressed to release the engaging projection (19) from the locking hole (20), and the shutter (1) is rotated by the urging force of the torsion coil spring (15) to form the duct. An inspection rod (14a) for closing (1) is internally pressured and supported so as to be movable in the axial direction. The inspection port (13) and the inspection rod (14a) constitute the inspection mechanism (14).

The rotation mechanism (3) includes a rotation shaft (5) connecting and fixing the shutter (2) and a tip end side of the rotation shaft (5), that is, a duct.
A torsion coil spring (which is connected to a portion projecting outside (left side in FIG. 2) of (1) and biases the rotating shaft (5) in a direction in which the shutter (2) closes the duct (1) ( 15) and pivot
From the base end side of (5), that is, the side opposite to the torsion coil spring (15) (right side in FIG. 2) and the rotation operation part (16) attached to the part protruding to the outside of the duct (1) Become.

The rotary operation part (16) is provided with a main shaft (17) connected and fixed to the base end of the rotary shaft (5), a handle (6) attached to the free end of the main shaft (17), and an intermediate part between them. And a lock mechanism (4). The "rotating shaft" referred to in the scope of utility model registration claims
In this embodiment, the rotating shaft (5) supporting the shutter (2) and the main shaft (17) are connected and fixed as in the present embodiment.

As shown in Fig. 3, a hooking projection (17
a) is provided, and the engaging projection (17a) is fitted with the engaging hole (6a) of the handle (6). Further, the holding member (18) of the handle (6) is attached to the main shaft (17) so that the handle (6) does not come off from the hooking protrusion (17a) and rotates around the central axis of the main shaft (17). It is fixed to the shaft hole.

At the tip of the main shaft (17) (left side in FIG. 3), the operating rod (11)
Is provided with a locking hole (20) with which the engaging projection (19) can be engaged, and as shown in FIG. 2, the operating rod (11) is provided in this locking hole (20).
When the engaging projection (19) is inserted, the turning shaft (5) is prevented from turning against the biasing force of the torsion coil spring (15), and the open state of the duct (1) is maintained. It In addition, the spindle (1
A fitting hole (21) serving as a guide for a lock pin (7) described later is provided on the base end side of 7) so as to penetrate in the diameter direction.

As shown in FIG. 3, the lock mechanism (4) is an L-shaped member including a top piece (23a) having an insertion hole (22) and a standing piece (23b) fixed to the handle of the handle (6). (23) and the spindle (17)
Lock pin (7) that is slidably inserted in the insertion hole (21) of
And a spring inserted into the fitting hole (21) so that the lock pin (7) is urged in the direction in which the tip projects from the fitting hole (21).
(24), a pressing plate (9) for unlocking, and the pressing plate
A return spring (26) interposed between the (9) and the L-shaped member (23) for urging the handle (6) to rotate clockwise in FIG.
And a sleeve (8) having a locking hole (27) with which the tip of the lock pin (7) is engaged. The base of this sleeve (8) is a seat plate in which a support frame ((17a) in FIG. 2) for supporting the main shaft (17) is installed.
It is fixed to (28) and attached to the outside of the duct (1) with screws (30).

The fitting hole (21) of the main shaft (17) is a guide for the lock pin (7), and in that sense constitutes a part of the lock mechanism (4).

The pressing plate (9) is capable of pressing the shoulder portion (7a) of the lock pin (7) against the spring (24) at the central portion thereof, and the lock pin (7) is the center. L on one side
It is inserted into the insertion hole (22) of the shaped member (23) and is fixed to the main shaft (17) with a fixing pin (25) on the other side. This pressing plate (9) is composed of a pair of half-divided members, that is, a U-shaped first pressing plate (9a) and a semicircular second pressing plate (9b) combined in a ring shape. In the combined state, the main shaft (17) is surrounded by a gap. The distal end side connecting portion on the other side of FIG. 3 is superposed on each other and fixed to the main shaft (17) by the fastening pin (25), and the proximal end side connecting portion (front side of FIG. 3). Then insert part bent in the radial direction
(22a) are stacked on each other and inserted into the insertion holes (22) of the L-shaped member (23).

Further, the first pressing plate (9a) has a longitudinal hole (2 in the circumferential direction through which the tip of the lock pin (7) penetrates the curved pressing portion.
9) is provided so that the inner surface of the pressing portion can engage with the shoulder portion (7a) of the lock pin (7) while swinging around the fastening portion of the pressing plate (9) as a fulcrum. The second pressing plate (9b) is provided with a similar long hole so as not to interfere with the lower end coming out from the fitting hole (21) of the lock pin (7). Further, a hole (25 ') for fixing to the fixing pin (25) is provided in the connecting portion (the other side in FIG. 3) on the tip side of each pressing plate (9a), (9b),
At the base end side connection part (front side in FIG. 3), the insertion parts (22a) are provided in a vertical shape, respectively, thereby enabling connection to the main shaft (17) and the L-shaped member (23). . That is, the pressing plate (9) connects the L-shaped member (23) and the main shaft (17) with a play of a predetermined angle.

Further, the first pressing plate (9b) is provided on the tip side of the second pressing plate (9b).
There is a hole (26 ') for connecting the return spring (26) for releasing the pressing of the shoulder part (7a) of the lock pin (7) by (a), and one end of the return spring (26) Is connected to this hole (26 '), and the other end is beyond the first pressing plate (9a) and the hole (26 ") of the L-shaped member (23)
Connected to.

The above is the main part of the embodiment, but when the trigger mechanism (T) is further described, the actuating rod (11) in FIG. 2 is different from the supporting rod (31) fixed inside the duct (1). , Axis (31a)
It is pivotally attached so as to rotate around, and an engaging projection (19) is formed between the tips of the support rod (31) and the operating rod (11) of the main shaft (17) when a predetermined temperature is reached. A shape memory alloy (spring) (32) is stretched to actuate the operating rod (11) so as to be pulled out from the locking hole (20). Further, the operating rod (11) is almost invisible in the figure, but when the shape memory alloy (32) is in a low temperature phase, the operating rod (11) is engaged with the engaging projection (19) through the locking hole (20). Spring for returning to the direction of locking with (clockwise in Fig. 2)
(33) is provided on the back.

The effects of the fire damper having the above structure will be described below.

In a normal state where no fire occurs, as shown in FIG. 2, the shape memory alloy (32) is in the low temperature phase and the engaging protrusions (19) are in the locking holes.
Since it is engaged with (20), the shutter (2) holds the duct (1) in an open state. In this state, since no force is applied to the handle (6) from the outside, the pressing plate (9) is biased clockwise by the return spring (26) for the handle, and as shown in FIG. 2 The pressing plate (9b) is in contact with the surface of the main shaft (17). Therefore, the insertion portion (22a) and the handle (6) are located just on the opposite side of the fastening pin (25). At that time, both ends of the U-shaped first pressing plate (9a) are linearly arranged, and the pressing plate (9) is farthest from the spindle (17). Further, the lock pin (7) is located in the central portion of the pressing plate (9) that is farthest from the main shaft surface. Therefore, the shoulder portion (17a) of the lock pin (7) is not pushed by the first pressing plate (9a), and its tip is pushed by the spring (24) against the inner peripheral surface of the sleeve (8) as shown in FIG. When the temperature of the duct (1) in which the fire next occurred is raised and the shape memory alloy (32) contracts due to the high temperature phase, the operating rod (11) resists the return spring (33). And rotate counterclockwise. Therefore, at the same time as the engaging projection (19) is removed from the locking hole (20), the shutter
(2) is rotated by the urging force of the torsion coil spring (15) and comes into contact with the stopper (10) to close the passage of the duct (1).

While reaching this state, the states of the lock pin (7) and the handle (6) change in the order of FIGS. 7, 5, and 4 (the state of FIG. 6 is not passed). That is, as described above, the handle (6) has no external force, so
The pressing plate (9b) contacts the surface of the main shaft (17), and the first pressing plate (9a)
Remains well away from the shoulder (7a). Therefore, the seventh
From FIG. 5 to FIG. 5, the lock pin (7) slides on the inner surface of the sleeve (8), and the spring comes out when the sliding contact surface shown in FIG. 5 is interrupted.
The tip of the lock pin (7) is engaged with the locking hole (27) by the urging force of (24). The state shown in FIG. 4 is obtained at the same time when the duct of the shutter (2) is closed.
Since (5) is in the non-rotating locked state, even if the shutter (2) receives the strong wind pressure generated in the duct (1), the rotating shaft (5) engages with the lock pin (7). Since it is locked by the stop action, it cannot rotate. Eventually the duct
(1) is never released.

Therefore, in this invention, once the duct (1) is closed by the shutter (2), the shutter (2) is locked by the lock mechanism (3) at the same time as the closing, so that the strong wind pressure in the duct (1) is increased. On the other hand, the closing of the shutter (2) does not become unstable.

Finally, when the fire is extinguished, the temperature of the shape memory alloy (32) drops,
In the low temperature phase, extension is possible, and the biasing force of the return spring (33) causes the operating rod (11) to move to the current position (engagement protrusion (19)
Try to rotate to the position where it is inserted into the locking hole (20). In this state, when the operator turns the shutter (2) 90 ° by operating the handle to open the duct (1),
When the locking hole (20) of the main shaft (17) comes to the position of the engaging protrusion (19), the engaging protrusion (19) engages with this. Therefore, the shutter (2) is held again with the duct (1) open.

The fireproof damper of the present invention exerts its original effect when the handle is operated. That is, when the handle is operated, the states of the lock pin (7) and the handle (6) are shown in FIG.
It changes in order of FIG. 5, FIG. 6 and FIG. The details are as follows.

First, when the handle (6) is rotated counterclockwise from the position of FIG. 4 to the position of FIG. 5 against the biasing force of the return spring (26), the L-shaped member (23) causes the handle (6) to move. At the same time, it tries to rotate the insertion portion (22a) of the pressing plate (9) in the same direction. On the other hand, the connecting part on the tip side of the pressing plate (9) is a fastening pin.
Since it is fixed to the main shaft (17) at (25), the first pressing member (9
a) is rotated around the fastening pin (25) and the main shaft (17)
The second pressing plate
(9b) moves away from the main axis (17). Therefore, the first pressing plate (9a)
Comes closer to the main shaft (17) at the center. Further, the lock pin (7) is displaced from the central portion of the U-shaped first pressing plate (9a) toward the end, that is, closer to the surface of the spindle. Therefore, the shoulder (7a) of the lock pin (7) is pressed downward,
The lock pin (7) is pushed downward against the urging force of the spring (24), and its tip is retracted.

In this way, at the initial stage of handle operation, the lock pin (7) automatically retracts in conjunction with the rotation of the handle (6), so that the tip of the lock pin (7) is locked in the locking hole (8) of the sleeve (8). 27)
The lock action is released. In addition, when the pressing plate (9) is rotated around the fastening pin (25) as a fulcrum,
(17), and by extension, the rotary shaft (5) still does not rotate.

After unlocking in this way, handle further
When (6) is rotated counterclockwise from the position shown in Fig. 5 to the position shown in Fig. 6, the lock pin (7) comes into contact with the end of the longitudinal hole (29), and the main shaft (17) and the rotating shaft. (5) rotates counterclockwise as the handle (6) rotates. Further, as described above, the engaging projection (19) of the operating rod (11) is fitted into the locking hole (20) of the spindle (17) at the position where the shutter (2) is parallel to the center line of the duct (1). Once engaged, the handle (6) can no longer be rotated. Even in this state, the lock pin (7) remains the first pressing plate.
The tip on the end side of (9a) is still pressed so as to retract.

Next, when the handle (6) is released at the position shown in FIG. 6, the handle (6) is returned clockwise to the position shown in FIG. 7 by the pulling force of the return spring (27), and the pressing plate (9) is again moved to the position shown in FIG. 2 Press plate (9
b) contacts the main shaft (17), the first pressing plate (9a) moves away from the main shaft (17), and the lock pin (7) comes to the center of the first pressing plate (9a). Therefore, the first pressing plate (9a) is separated from the lock pin (7), and the pressing action on the lock pin (7) is released. And the tip of the lock pin (7) is prepared as described above for the closing of the shutter in the event of a fire.
Is in contact with the inner peripheral surface of. During this time, the spindle (17)
Does not rotate.

The lock pin (7) operates when the inspection mechanism (14) intentionally actuates the operating rod (11) to close the duct (1), or when the handle is operated to open the duct closure. It is similar to the state.

[Advantage of the Invention] As described above, the present invention not only can stabilize the closing by the shutter by locking the rotating shaft, but also rotates the handle to open the closed state. At the same time, since the lock action is released at the same time, there is an advantage that the duct opening and the lock release can be performed by one operation. Regarding this point, the problem that the lock mechanism is damaged when the duct is opened without forgetting to release the lock is solved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a first view.
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 3, FIG.
FIG. 7 to FIG. 7 are sectional views showing the main parts of the lock mechanism in the order of passage from the passage closed state to the opened state of the duct. (1): Duct (2): Shutter (3): Rotating mechanism (4): Locking mechanism (5): Rotating shaft (6): Handle (7): Lock pin (8): Tube (9) : Press plate (21): Fitting hole (27): Locking hole

Claims (1)

[Scope of utility model registration request] 1. A fire protection damper, wherein a rotating mechanism for rotating a shutter of a duct is provided with a lock mechanism for preventing the shutter from rotating when the shutter closes the duct. Comprises a rotary shaft connecting and fixing the shutter, and a handle rotatably provided on the base end side of the rotary shaft projecting from the duct so as to be rotatable around the axis of the rotary shaft. The lock mechanism includes a lock pin slidably fitted in a fitting hole provided in the diametrical direction on the base end side of the rotary shaft, and the tip is biased in a direction projecting from the fitting hole, and the lock pin. A sleeve having a locking hole on the inner surface to which the tip of the pin engages and fixed to the duct concentrically with the rotating shaft, and a pressing force capable of engaging the lock pin in the direction of withdrawing from the locking hole. It consists of a board and When the dollar is not operated, the lock pin is not pressed by the pressing plate, and when the handle is operated in the direction to close the duct, the lock pin is pressed in the direction to be removed from the locking hole. The fireproof damper in which the pressing plate is fixed to the rotating shaft on one side of the lock pin, is connected to the handle on the other side, and can be engaged with the lock pin at the intermediate portion.