Fire extinguishers – Sprinkler heads
Patent
1997-06-16
1999-08-31
Pike, Andrew C.
Fire extinguishers
Sprinkler heads
A62C 3714
Patent
active
059441135
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sprinkler which in standby mode comprises a heat-sensitive releasing device in close contact with a spindle. More specifically, the invention relates to a sprinkler comprising a body provided with at least one nozzle, a liquid inlet, and a passage for supplying extinguishing medium to at least one nozzle, the sprinkler in standby mode comprising a heat-sensitive releasing device in close contact with a spindle displaceably mounted in a liquid passage with an inlet and an outlet to said nozzle.
The releasing device can be, for example, a glass ampoule which breaks at an elevated temperature. In order to ensure rapid release, it is desirable to make the ampoule as thin as possible. Even a thin ampoule resists a sufficiently heavy mechanical load if the load is exerted directly on the end of the ampoule and is even.
Swedish patent publication 501 267 discloses a sprinkler of this kind. However, the known sprinkler does not allow a high liquid pressure to prevail in the liquid inlet when the sprinkler is in standby mode, and therefore rapid release of the sprinkler is not possible. In this known sprinkler, a high liquid pressure would exert such a great force on the releasing device that the releasing device would break. In order to avoid breakage, the releasing device should have a special construction.
The object of the present invention is to provide a new sprinkler which ensures even and straight load on the releasing device; the load is not so heavy that the releasing device can break merely by the action of the liquid pressure when the sprinkler is in standby mode.
The sprinkler according to the invention is characterized in that the liquid passage consists of a channel against whose wall the spindle bears slidably or almost slidably, said spindle and channel extending to both (i.e., opposite) sides of the inlet of the channel for at least partial balancing of the liquid pressure at the inlet when the sprinkler is in standby mode, and that a nozzle centrally directed in relation to the obliquely positioned nozzles is provided at that end of the spindle which faces the releasing device.
In the following, the invention will be described in greater detail with reference to an embodiment shown in the accompanying drawings, in which
FIG. 1 is a longitudinal section on line 1--1 in FIG. 3 of an embodiment of the invention in standby mode,
FIG. 2 is a longitudinal section similar to FIG. 1 in released mode, and
FIG. 3 is a bottom perspective view of the embodiment of FIG. 1.
In FIGS. 1 and 2, reference numeral 1 denotes a sprinkler. The sprinkler comprises a sprinkler housing 2, which is secured to a ceiling 4 by a plurality of screws 3 only one shown; the sprinkler housing 2 is provided with a liquid inlet 5, which extends through the ceiling 4 and continues as a central channel 6. The sprinkler is further provided with an insert 7 comprising an insert housing 8 which is attached to the sprinkler housing 2, for instance, by means of a head 9 screwed in the central channel 6 and tightened against the sprinkler housing.
The head 9 of the insert housing 8 comprises a plurality of inlet openings 10 which are connected through a filter 11 to the liquid inlet 5 and which lead to a central channel 12 in the head 9. The central channel 12 branches off through branchings 13 to a plurality of obliquely positioned nozzles 14. A spindle 15 is slidably mounted in the central channel 12 of the insert housing 8. When the sprinkler is in standby mode, as shown in FIG. 1, the spindle 15 is sealed against the head 9 by means of a sealing 16 below the liquid inlet openings 10. The central channel 12 extends to both sides of the liquid inlet openings 10 to prevent the liquid pressure from exerting too great a downward force on the spindle 15 when the sprinkler is in standby mode.
The spindle 15 is also provided with a central channel 17 (hereafter: spindle channel) which below the spindle sealing 16 is connected via openings 18 to the central channel 12 of the head 9 and therefrom via the branch
LandOfFree
Sprinkler having liquid supply pressure balance in stand by mode does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sprinkler having liquid supply pressure balance in stand by mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sprinkler having liquid supply pressure balance in stand by mode will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2423666