[0001] Fire damper is the subject of the invention. One of the problems that needs to be
solved for making ventilation and air-conditioning installation is fire protection
for vented or air-conditioned object. Unprotected ventilation and air-conditioning
ducts and pipes running through the elements of fire division are the way where fire
is spread through that decrease fire protection level. The solution for this problem
is fitting inside those installations cut off elements that allow for walls, ceiling
and floor structural fire protection integrity where the ventilation and/or air-conditioning
ducts and pipes are run through. This way they protect other areas against hot smoke
and gas and allow for regular installation operation. Those elements are fire cut
off flap valves that are elements of fire safety installed in the ventilation and/or
air-conditioning ducts and pipes passages through the walls, ceiling and floors.
[0002] Patent literature offers various cut off flap valves solutions working in auto and
controlled mode. British patent claim nr
GB 2 399 497 presents a cut off flap valve, placed outside the vent duct, equipped with spring
tightening device. The flap is kept in open position by the outer wall of the vent
duct. Duct closing results from losing stiffness by the heated vent duct. Flap thrust
effected by the spring device on the wall of the vent duct results in progressing
wall of the vent duct denting as long as the flow is completely cut off.
[0003] European patent claim nr
EP 0 829 689 presents a flap valve fitted axially in the narrowing place inside the vent duct.
The narrow place it is a ring fixed in horizontal plane with flap rotation axis. Both
the ring and the flap are formed in such a way that the flap rotating 90° rests against
the pitch / thread made in the ring. Additionally, flexible plates are fitted on the
flap and the ring, sealing the flap in the position closed.
[0004] Another solution was given for the cut off flap valves construction described in
Swedish patent claim nr
SE 9003794. Flap placed inside the body is fixed in the axis that as soon as leaves the body
is bent at the right angle. Leaving outside bent end of the axis rests against fuse
- link element that melts at high temperature releases it allowing spiral spring,
placed in the axis of flap rotation to act. That makes flap rotate and closing gas
flow.
[0005] The subject of his invention is the fire damper composed of the body where division
is self-aligning fixed against the axis division of the closing spring device and
releasing fuse link element; featured by the fact that the spring closing device and
releasing fuse link element are placed inside the body in the plane perpendicular
to the axis where the division is fixed on, and besides, there is a flexible sealing
ring on the notch made in the circumference of the division that works closely with
thermal expanding gasket located inside on the body wall in lateral plane corresponding
to the position of the division in the closed position. It is also important that
there are at least two rows of lengthwise holes on the body wall in lateral plane
corresponding to the position of the division in the closed position, protecting against
heat conduction along the vent duct walls. Apart from it typical feature is the fact
of fixing switch limits installation inside the body monitoring division position.
Fire damper's body is made in such a way its diameter equals the diameter of vent
ducts.
[0006] The subject of his invention is displayed in fig. 1 presenting longitudinal semi-view
and semi-section of the fire damper in nipple make for closed position, while fig.
2 presents longitudinal semi-view and semi-section of the cut off flap valve in sleeve
make for closed position open, however, fig. 3 presents longitudinal view of the cut
off flap valve with limit switches for position closed. Fig. 4 presents the detail
of division execution in the sectional view.
[0007] Division
6, made of high temperature resistant metal was fixed diagonally in the pipe body
5 on bearings
4 axis
1 of division
6, kept in open position with fuse - link releasing device
3. Additionally division
6 is connected to body
5 with spring
2. Spring closing device
2 and fuse - link releasing element
3 are fitted inside the body
5 in the plane perpendicular to axis
1, where division
6 has been fixed. The division
6 has a notch
10 in the circumference, where flexible sealing ring
11 has been mounted that works closely with thermal expanding gasket
12 located inside on the body wall
5 in lateral plane corresponding to the position of the division
6 in the closed position. Besides, in order to protect against heat conduction along
the body
5 there are at least two rows of lengthwise holes
13 on the body wall in lateral plane corresponding to the position of the division in
the closed position
6, and the holes are displaced one against another. Division position
6 monitoring is guarantied by employing limit switches, placed inside the body
5. Bracket
7 has the switch limit installed
9 monitoring division
6 position for open position. Limit switch
8 monitors division
6 position for closed position.
[0008] Body
5 of the valve has diameter similar to that for vent duct that makes installation fitting
easier. The valve can be made in two body
5 alternatives. Nipple version for the body
5 has vent ducts' faucets put on the body ends; while sleeve alternative has vent ducts
ends inserted into the body's interior
5. During regular vent installation operation flap valve is open. Area where the fire
outbreak, is self-separated by closing the fire resisting division
6 due to temperature increase in th vent duct and releasing fuse switching
3 that results in potential energy release concentrated in the tightened spring of
the closing device
2. Optionally there is a possibility of adding in row to the release fuse device
3 an electromagnet that allows for division
6 position remote control.
1. The fire damper, composed of the body where division is self-aligning fixed against
the axis division of the closing spring device (2) and releasing fuse link element (3) are placed inside the body (5) in the plane perpendicular to the axis (1) where the division is fixed on (6), and besides, there is a flexible sealing ring (11) fixed on the notch made in the circumference of the division (6) that works closely with thermal expanding gasket (12) located inside on the body wall (5) in lateral plane corresponding to the position of the division (6) in the closed position.
2. The fire damper according to claim 1 is featured by the fact that there are at least
two rows of lengthwise holes (13) on the body wall (5) in lateral plane corresponding to the position of the division (6) in the closed position, protecting against heat conduction along the vent duct walls.
3. The fire damper according to claim 1 is featured by the fact that there are limit
switches (8) and (9) placed inside the body (5), monitoring division's position (6).
4. The fire damper according to claim 1 is featured by the fact that adding to the releasing
fuse link device (3) an electromagnet in rows remote control for the division (6) is enabled.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description
