JP3443772B2 - Fire damper for double pipe - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire damper used for a ventilation duct called a double pipe. 2. Description of the Related Art As a damper of this type, for example, Japanese Patent Application Laid-Open No. 2000-14819 discloses that a valve housing having a rectangular cross section is interposed in a part of an outer tube and a valve housing is provided between the valve housing and the inner tube. A fireproof damper device that shuts off the outside air passage by the rotation of the damper blade is disclosed. [0003] In the above-mentioned conventional apparatus,
The damper blades of the external ventilation path need to be composed of at least two blades, each of which must be operated separately, so that an increase in the number of parts and a complicated structure are inevitable. A fire damper used for a ventilation duct called a double pipe comprising an outer duct and an inner duct inserted in the outer duct of the present invention is connected to the outer duct. And an inner pipe which is inserted at a predetermined interval into the outer pipe, forms an outer ventilation path between the outer pipe and the inner pipe, and has an inner part connected to an inner duct forming an inner ventilation path. , At a position corresponding to the protrusion of the inner tube, which protrudes to the inner peripheral surface of the outer tube provided at the axial center of the inner tube,
A swelling portion provided on the outer tube so that at least the circumferential cross-sectional area of the outer ventilation passage is maintained, and when the inner peripheral surface of the outer tube slides in the axial direction and the edge contacts the protruding portion, the outer ventilation A damper cylinder for closing the path, a damper plate provided in the inner pipe and closing the inner ventilation path by rotation by the biasing force of the spring, and a temperature sensor for the inner and outer ventilation paths provided through the inner pipe. A temperature fuse unit that is activated when any of the temperature sensing units senses a temperature equal to or higher than a set temperature, and by operating the thermal fuse unit, the biasing force accumulated in the spring is released to allow internal ventilation through the damper plate. And a cam mechanism for simultaneously closing the outer ventilation path with the damper cylinder. According to the present invention, the outside ventilation passage can be cut off with only one damper cylinder, and the operation is performed by using the urging force accumulated in the spring provided on the damper plate for blocking the inside ventilation passage. As a result, the number of components is reduced, the structure is simplified, and instability of operation is reliably eliminated. Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 to FIG. 5 show a first embodiment of a fire damper for a double pipe according to the present invention. FIG. 1 is a horizontal sectional view of a double pipe fire damper, showing a state where the damper is not operated, and FIG. 2 is a vertical sectional view of a double pipe damper showing a state where the damper is operated. 3 is a cross-sectional view for explaining the thermal fuse body, FIG. 4 is a plan view for explaining the operation of the cam mechanism, and FIG. 5 is a cross-sectional view for explaining the spacer. [0007] The fire damper for a double pipe according to the present invention comprises an outer duct and an inner duct inserted into the outer duct.
It is a fire damper used for a ventilation duct called a double pipe. An inner pipe 2 connected to an inner duct of the double pipe is inserted into an outer pipe 1 connected to the outer duct of the double pipe. The inner pipe 2 is held at predetermined intervals in the outer pipe 1 by a plurality of spacers 25 shown in FIG. An outer air passage 11 is formed between the outer tube 1 and the inner tube 2, and an inner air passage 21 is formed inside the inner tube 2 itself. A projection 22 is provided at the center of the inner tube 2 in the axial direction, and the projection 22 projects from the peripheral surface of the inner tube 2 to a height reaching the inner peripheral surface at the opening of the outer tube 1. Has been established. The outer tube 1 has a bulge 12 at a position corresponding to the protrusion 22 of the inner tube 2. The bulging amount of the bulging portion 12 of the outer pipe 1 is set so that at least the circumferential cross-sectional area of the outer ventilation passage 11 at the connection portion with the double pipe duct is maintained. At the substantially axial center of the outer tube 1 is inserted a cylindrical damper tube 13 which is in contact with the inner peripheral surface of the outer tube 1 and can slide in the axial direction. When the damper cylinder 13 slides and one edge of the cylinder comes into contact with the projection 22,
Since the other edge is still in contact with the inner peripheral surface of the outer tube 1, the outer ventilation passage 11 can be closed. A pin 14 is provided upright on the inner surface of the damper cylinder 13. On the other hand, the inner pipe 2 is provided with a rotary shaft 5 penetrating in a radial direction of the inner pipe 2, and a disk-shaped damper plate 51 for closing the inner air passage 21 is attached to the shaft 5. At one end of the rotating shaft 5 protruding from the inner pipe 2, a hinged torsion coil-shaped spring 52 urged in a direction in which a damper plate 51 closes the inner ventilation path 21 is attached. Note that the damper plate 51 is locked by a cam mechanism 4 provided at the other end of the rotating shaft 5 so as not to rotate so that the damper plate 51 is in a direction parallel to the ventilation direction in the inner ventilation passage 21 in normal times. Also, as shown in FIG.
A temperature fuse body 3 penetrating through the inner tube 2 is provided near the shaft 5 of the damper plate 51 at a position where rotation of the damper plate 51 is not prevented. As shown in cross section in FIG. 3, the thermal fuse body 3 has an inner tube 2 at its cap 33 portion.
Fixed to. An outer pipe 34 is connected to the cap 33, and the other end protrudes to the outer ventilation passage 11. An opening 35 is provided in the outer pipe 34, and the temperature sensing unit 31 is exposed to the outside ventilation passage 11, and the temperature sensing unit 32 is exposed to the inside ventilation passage 21. At the center of the cap 33, a head of a fuse holder 36 whose head projects from the cap 33 is inserted. A connecting rod 37 is provided in a hole at the bottom of the fuse holder 36.
Is inserted. The intermediate portion of the connecting rod 37 is connected to one end of an inner pipe 39 externally inserted into the connecting rod 37 by a temperature fuse 38 in the temperature sensor 32. The other end of the inner pipe 39 is connected to the bottom of the outer pipe 34 by a temperature fuse 40 in the temperature sensor 31. The fuse holder 36 includes a compression coil spring 4
1, the head is urged in a direction to be depressed, so that the ventilation inside the internal ventilation passage 21 becomes higher than the set temperature, and when the temperature fuse 38 of the temperature sensor 32 melts, the connecting rod 37 and the inner pipe 39 are melted. Is released, and the head of the fuse holder 36 falls from the tip of the cap 33. Further, when the temperature of the ventilation in the outside ventilation passage 11 becomes higher than the set temperature and the temperature fuse 40 of the temperature sensing unit 31 melts, the outside pipe 34
The connection between the fuse holder 36 and the inner pipe 39 is released. That is, when the temperature of the air flow in either the outer ventilation passage 11 or the inner ventilation passage 21 becomes higher than the set temperature, the head of the fuse retainer 36 falls. Of course,
The head of the fuse retainer 36 also falls when the ventilation in both the outer ventilation passage 11 and the inner ventilation passage 21 simultaneously exceeds the set temperature. Next, the cam mechanism 4 that links the fuse holder 36 of the thermal fuse body 3 with the rotating shaft 5 of the damper plate 51 will be described. The cam mechanism 4 includes an outer peripheral surface of the inner pipe 2,
That is, it is provided in the outside ventilation passage 11. FIG. 4 is a plan view for explaining a main part of the cam mechanism, and a normal state is indicated by a solid line. A lever 53 is fixed to a portion of the damper plate 51 protruding from the inner tube 2 of the rotating shaft 5. One leg 54 of the lever 53 is in contact with the head of the fuse holder 36 of the thermal fuse body 3, and the other leg 55 is provided with a long hole 56, in which the pin of the damper cylinder 13 is inserted. 14 are fitted. Therefore, the temperature of the air in the ventilation path becomes higher than the set temperature, and the head of the fuse holder 36 is
When the lever 53 falls from the tip of the
The lever 53 rotates to the position 53 'by the urging force of 2. Therefore, the damper plate 51 rotates 90 ° to a position 51 ′ in contact with the stopper 23, closes the inner air passage 21, and at the same time, the pin 14 of the damper cylinder 13 also moves by one.
The outer ventilation path 11 is closed by moving the damper cylinder 13 to the position 4 '. In this way, the operation of the thermal fuse body 3 releases the biasing force accumulated in the spring 52, and simultaneously closes the inner ventilation passage 21 by the damper plate 51 and the outer ventilation passage 11 by the damper cylinder 13. It is supposed to. In order to return the damper plate 51 and the damper tube 13 to the normal position, the inspection hole 15 is opened, the lever 53 is returned to the original position while the damper tube 13 is pushed back, and the thermal fuse body 3 is replaced. , The fuse holder 3
The head of No. 6 is preferably engaged with one foot 54 of the lever 53. At the connection portions at both ends of the outer pipe 1, stoppers 16 for the outer duct of the double pipe are provided. Also, at both ends of the inner pipe 2 at the connection with the inner duct of the double pipe, a sealing material 24 having an E-shaped cross section is buried, so that even if the double pipe is misaligned, ventilation does not leak at the connection. It has become. Further, in order to hold the outer tube 1 and the inner tube 2 at a predetermined interval, a triangular spacer 25 as shown in FIG.
Should be extrapolated. The spacer 25 also serves as a stopper for the inner duct. FIG. 6 is a cross-sectional view of a double pipe fire damper according to a second embodiment of the present invention, showing a state in which the damper is operated.
In the first embodiment, the protruding portion 22 stands from the peripheral surface of the inner tube 2, or in this example, the inner tube 2 itself is bulged. By smoothing the undulation of the protruding portion 22 in this manner,
The local pressure loss of the outside ventilation passage 11 can be greatly reduced. The other configurations are the same, so the same reference numerals are given and the description is omitted. In the double pipe fire damper of the present invention, the set temperature of each temperature fuse in the temperature detecting section of the inner and outer pipes can be individually selected and set. That is, a temperature fuse that operates at 72 ° for general air-conditioning can be attached to an exhaust ventilation path such as a bathroom or a toilet, and a temperature fuse that operates at 120 ° can be attached to an exhaust ventilation path of a room using a fire such as a range. The fire damper for a double pipe according to the present invention is constructed as described above, so that the outside air passage can be cut off with only one damper cylinder, and the inside air passage is cut off. Since the operation is performed by using the biasing force accumulated in the spring provided on the damper plate, the number of parts is reduced, the structure is simplified, and the instability of operation is reliably eliminated. Further, it is possible to individually set the set temperature of each temperature detecting portion in the ventilation path of the inner and outer pipes by appropriately selecting the operating temperature of the temperature fuse according to the type of ventilation. Therefore, even in a normal use state, the temperature fuse of the fire prevention damper operates to close the ventilation path, thereby preventing an accident such as insufficient ventilation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a horizontal sectional view of a fire damper for a double pipe according to a first embodiment of the present invention, showing a state where the damper is not operated. FIG. 2 is a vertical sectional view of the double-pipe fireproof damper, showing a state in which the damper is operated. FIG. 3 is a sectional view for explaining a thermal fuse body. FIG. 4 is a plan view for explaining the operation of the cam mechanism. FIG. 5 is also a cross-sectional view for explaining a spacer. FIG. 6 is a cross-sectional view of a fire damper for a double pipe according to a second embodiment of the present invention, showing a state where the damper is operated. [Description of References] 1 is an outer tube, 2 is an inner tube, 3 is a temperature fuse body, 4 is a cam mechanism, 5 is a rotating shaft, 11 is an outside ventilation passage, 12 is a bulging portion, 13
Is a damper cylinder, 14 is a pin, 15 is an inspection hole, 16 is a stopper, 21 is an internal ventilation path, 22 is a protruding part, 23 is a stopper, 24 is a sealing material, 25 is a spacer, 31 is a temperature sensing part, and 32 is temperature. A sensing part, 33 is a cap, 34 is an outer pipe, 35 is an opening, 36 is a fuse holder, 37 is a connecting rod, 38 is a thermal fuse, 39 is an internal pipe, 40 is a thermal fuse, 41 is a compression coil spring, and 51 is a compression coil spring. Damper plate, 52 is a spring, 53 is a lever, 54 is a foot, 55 is a foot,
56 is a long hole.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2000-14819 (JP, A) JP-A-59-76255 (JP, U) JP-A-62-83130 (JP, U) JP-A-1-126262 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 13/14 A62C 2/12 A62C 3/00

Claims (1)

(57) [Claim 1] A fire damper used for a ventilation duct called a double pipe comprising an outer duct and an inner duct inserted in the outer duct, wherein An outer pipe connected to the outer duct, and (b) inserted through the outer pipe at a predetermined interval to form an outer air passage between the outer pipe and the inner pipe itself, thereby forming an inner air passage. An inner pipe connected to the inner duct, and (c) a protruding portion that protrudes to an inner peripheral surface of the outer pipe provided at an axial center of the inner pipe.
(D) a bulging portion provided on the outer tube so as to maintain at least a circumferential cross-sectional area of the outer ventilation passage at a position corresponding to the projecting portion of the inner tube; and (e) an inner periphery of the outer tube. A damper cylinder that closes the outer ventilation path when the edge slides on the surface in the axial direction and the edge comes into contact with the protruding portion; and (f) the inner ventilation pipe provided in the inner pipe and rotated by the biasing force of a spring. A damper plate for closing a path, and (e) a temperature sensor provided in the inner pipe and penetrating through the inner pipe, and having a temperature sensor in the inner air path and the outer air path, and detecting a set temperature or more by any of the temperature sensors. And (g) the operation of the thermal fuse body releases the biasing force accumulated in the spring to open the internal ventilation path by the damper plate and the external ventilation path by the damper cylinder. And a cam mechanism that closes at the same time. Fire dampers.