Fixed tire extinguishing system with additive injection apparatus |
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| 申请号 | US3642072D | 申请日 | 1969-10-08 | 公开(公告)号 | US3642072A | 公开(公告)日 | 1972-02-15 |
| 申请人 | FACTORY MUTUAL RES CORP; | 发明人 | LIVINGSTON WILLIAM L; | ||||
| 摘要 | An injection apparatus for introducing a slurry of waterswellable gelling agent into a water line feeding a fixed fireextinguishing system to form an ablative extinguishant therein. The apparatus includes a peristaltic pump driven by a hydraulic motor using water at line pressure for motive fluid and controlled by a servomechanism driven in part by a flow sensor to ensure injection rates corresponding to flow rates of water in the line. The injection apparatus is operated in a no-injection failure mode to avoid interference with normal flow of plain water to the fire-extinguishing system. | ||||||
| 权利要求 | 1. A fixed fire extinguishing system for a space to be protected comprising a plurality of fixed extinguishant dispersing heads located in said space in horizontally spaced apart relation, each of said heads producing a spray of droplets when activated, means for automatically opening said heads in response to information received from a fire in said space, a plurality of branch pipelines connected to said heads, a conduit for supplying water under pressure to said branch lines and heads, injecting means for injecting a water-swellable gelliNg agent into said conduit, means for activating said injecting means automatically in response to the flow of water through said conduit caused by the opening of one or more of said heads by the fire, and means for controlling the rate of injection of said gelling agent into said conduit to maintain the ratio by weight of gelling agent to water between predetermined maximum and minimum ratios while the water flowing through said conduit varies, the mixture of gelling agent and water producing a uniform gel without free water for delivery from said heads in a spray of droplets. 2. The apparatus of claim 1 wherein said injecting means comprises a peristaltic pump for injecting into said conduit a dilatant slurry of said water-swellable gelling agent, said pump having intake means to receive said slurry and discharge means opening into said conduit, and means to drive said pump to inject said slurry into said conduit. 3. The apparatus of claim 1 wherein said activating means comprises sensing means for sensing waterflow through the conduit and generating a corresponding output, and wherein said control means comprises means operatively connected between said sensing means and said injecting means for actuating said injecting means in response to said output. 4. The apparatus recited in claim 2 wherein said means to drive said pump comprises a motor, means drivably connecting said motor to said pump, and wherein said control means controls the speed of said motor in accordance with the flow rate of water in said conduit. 5. The apparatus recited in claim 4 wherein said motor is a hydraulic motor having an intake passage communicating with said conduit, whereby the water in said conduit provides the motive fluid for said motor. 6. The apparatus recited in claim 5 wherein said motor speed control means includes a valve in said intake passage, and regulating means connecting said activating means to said valve. 7. The apparatus recited in claim 6 wherein said regulating means comprises servomeans having a first input means connected to said activating means, second input means drivably connected to said motor, and output means driven by the differential of said input means. 8. The apparatus recited in claim 7 wherein said activating means comprises a rotatable screw in said conduit and means to prevent rotation of said screw by said servo means. 9. The apparatus recited in claim 7 wherein said servo means comprises a differential gear unit having end gears to define said input means and a ring gear defining said output. 10. The apparatus recited in claim 5 including slip clutch means to delay driving connection of said motor to said pump after starting said motor whereby said pump is driven by said motor after said motor develops operating torque. 11. The apparatus recited in claim 4 including cap means for sealing the discharge of said end of said pump and means to remove said cap means in response to operation of said motor. 12. The apparatus recited in claim 11 including a pulse generator drivably connected to the output of said motor and explosive means connected to said pulse generator to destroy said sealing cap upon operation of said motor. 13. The apparatus recited in claim 12 including capacitor means to store the discharge of said generator as a result of minor flow fluctuations in said conduit. 14. The apparatus recited in claim 2 comprising further, means for mixing said slurry with water at the point where said discharge means opens into said conduit. 15. The apparatus recited in claim 14 in which said mixing means comprises an eddy plate on the end of said discharge means to develop a zone of turbulence immediately downstream from said point. 16. The apparatus recited in claim 15 wherein said eddy plate is flexible and thus collapses under relatively high flow rates of plain water in said conduit as a result of malfunction of said injection means. 17. The apparatus of claim 1 wherein said injecting means comprises a pumP, and a motor adapted to be connected to said conduit and driven by said water, said motor being drivingly connected to said pump. 18. The apparatus of claim 1 wherein said injecting means comprises a pump, and a motor adapted to be connected to said conduit and driven by said water, said motor being drivingly connected to said pump, and said controlling means comprises a valve disposed in said conduit for varying the quantity of waterflow into said motor, and a differential device having an input connected to said sensing means and to said motor and an output adapted to control the operation of said valve. 19. The system of claim 1 wherein said controlling means maintains said ratio substantially constant at a point between one part per thousand of said gelling agent to said water and four parts per thousand of gelling agent to water, said gelling agent being an ablative gelling agent to produce at said ratio an ablative fluid material for delivery from said heads. 20. The system recited in claim 1 wherein said injecting means includes motor means energized in said water. 21. The system as recited in claim 18 wherein said injecting means injects said gelling agent into said conduit at a rate determined by said motor means, and wherein said controlling means controls said motor means. 22. The system as recited in claim 21 wherein said last mentioned means comprises slip clutch means for applying an initial impact to said pump to get it started. 23. The system as recited in claim 19 including means in said conduit acting on the gelling agent and water to improve the mixing of the two components forming said ablative fluid material before the material reaches said branch lines. 24. The system as recited in claim 1 wherein said system automatically continues to deliver water to said heads for fighting the fire in the event said injecting means fails to operate after a head has been opened by the fire. 25. The system as recited in claim 19 wherein said controlling means is responsive to the flow rate of the water flowing through said conduit. |
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