Fire extinguishers – Special applications
Patent
1987-07-02
1993-03-16
Peters, Jr., Joseph F.
Fire extinguishers
Special applications
169 48, 169 60, A62C 3510
Patent
active
051936224
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a device for eliminating the risk of fire due to hot particles which may be burning or glowing as they pass in the longitudinal direction of a pipeline by means of i) a valve which can be controlled to block a pipeline when a risk of fire is indicated in the pipeline and/or connected parts, and ii) a container with an extinguishing agent, in the form of a gas or liquid, intended to be fed into the pipeline in connection with its blocking.
2. Description of Related Art
The invention is useful for example in pneumatic transport of combustible particles, e.g. in the form of cellulose fibres, within pipelines in connection with working or drying material. A detector that can be of the type taught in Swedish patent 364 588 is utilized for detecting, sensing, or otherwise indicating risk of fire occuring in the pipeline. The detector will cause release of a valve, e.g. of the type described in Swedish patent 7503401-7, in an electric way. A so-called explosive release of the valve will then be provided by a pin release means. A similar pin release means may also be utilized to initiate an explosive release with a separate feeding of an extinguishing agent into the pipeline from a container with overpressure.
SUMMARY OF THE INVENTION
It is the primary object of this invention to simplify the control and use of the valve and the pressure medium. According to the present invention only an electric lighter is required which reduces the costs of the new device to a large extent in relation to what has been the case before.
This object of the invention is achieved by means of a device of the kind mentioned above, in which a container for the fire extinguishing agent is connected to the valve via a line for an extinguishing agent so that such an agent passing out of the container will initiate, on one hand, a release of the valve and, on the other hand, reinforce its effect by extinguishing or smothering any burning or glowing particles which may be present within the pipeline in connection with the valve. Thus, the extinguishing agent used has two essential functions in a construction of this kind. It is used, on one hand, to activate the valve and, on the other hand, to extinguish burning or glowing particles or objects.
The line containing the extinguishing agent can be directly connected to the pipeline via the valve. Moreover, the line can include one or more branch lines in the direction of flow before and/or after the connected valve. Each branch line ends separately in the pipeline. The container consists preferably of a metal bottle, the extinguishing agent preferably consisting of compressed halogen or nitrogen gas.
BRIEF DESCRIPTION OF THIS DRAWING
The invention will be described in greater detail below in the form of some preferred illustrative examples with reference to the enclosed drawing.
FIG. 1 is a lateral section of a part of a pipeline provided with a fire risk detector and a device formed according to the principles of the invention. The arrangement is illustrated in a considerably simplified form.
FIG. 2 shows also in lateral section an arrangement having essential similarities to the arrangement in FIG. 1. However, the device embodied according to the invention is somewhat modified.
DETAILED DESCRIPTION
In FIG. 1 a section of a pipeline 10 is shown, which extends, in a way not shown in detail, from a place, e.g., for working or drying a material, to the following process station unit or units, such as cyclones, silos or filters in which a fire or explosion may arise due to glowing or burning particles 12 brought along in the pipeline 10. A detector 14 for sensing or indicating the burning or glowing particles 12 is placed in a so-called disturbance zone along the line at a suitable distance from the place for working or drying so that "innocent" sparks which may have existed in the particles being conveyed would have sufficient time to become extinguished before they reach this zone. Burning or glowing parti
REFERENCES:
patent: 347794 (1886-08-01), Hexamer
patent: 2989348 (1961-06-01), Reed
Brahan Thomas J.
Firefly AB
Peters Jr. Joseph F.
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