FIRE PREVENTION EQUIPMENT AND SPRAYING METHOD

• US 20130180737A1
• Filed: 03/08/2013
• Published: 07/18/2013
• Est. Priority Date: 10/29/2007
• Status: Active Grant

• Current Assignee: Hochiki Corporation
• Original Assignee: Hochiki Corporation
• Inventors: TSUJI, Toshihide, HAYASHI, Tatsuya
• Granted Patent: US 8,776,902 B2
• Time in Patent Office: Days
• US Class Current: 169/37
• CPC Class Codes: A62C 31/02 Nozzles specially adapted for fire-extinguishing
• CPC Class Codes: A62C 35/00 Permanently-installed equipment A62C31/00, A62C33/00, A62C37/00 take precedence; for forming water curtains A62C2/08
• CPC Class Codes: A62C 35/64 pressurised
• CPC Class Codes: A62C 35/68 Details, e.g. of pipes or valve systems valves in general F16K
• CPC Class Codes: A62C 99/0072 using sprayed or atomised water
• CPC Class Codes: B05B 5/0535 at least two electrodes having different potentials being held on the discharge apparatus, one of them being a charging electrode of the corona type located in the spray or close to it, and another being of the non-corona type located outside of the path for the material

Abstract

Fire-extinguishing agent supplying equipment pressurizes a water-based fire-extinguishing agent and supplies the agent via a pipe; and the water-based fire-extinguishing agent is pressurized and supplied via the pipe to an electrification spray head installed in a protection area A, and the jetted particles of the fire-extinguishing agent are electrified and sprayed from the electrification spray head. A pulsed or alternating electrification voltage is applied to the electrification spray head from a voltage application unit 15, and an external electric field generated by applying the voltage between a water-side electrode unit and an induction electrode unit is applied to the fire-extinguishing agent in a jetting process to electrify the jetted particles.

Claims

1. An electrification spray head comprising:

an injection nozzle for converting a water-based fire-extinguishing agent to particles and spraying the particles by jetting the fire-extinguishing agent to an external space;

an induction electrode unit disposed in a jetting space side of the injection nozzle; and

a water-side electrode unit disposed in the injection nozzle and brought into contact with the water-based fire-extinguishing agent,

wherein an external electric field is generated by applying a voltage between the induction electrode unit and the water-side electrode unit to the water-based fire-extinguishing agent in a jetting process from the injection nozzle.

2. The electrification spray head according to claim 1, wherein the water-side electrode unit is part of the injection nozzle using an electrically conductive material or a pipe using an electrically conductive material.

3. The electrification spray head according to claim 1, wherein the induction electrode unit is any of or a complex of a metal having electric conductivity, a resin having electric conductivity and a rubber having electric conductivity, and has any of a ring shape, a cylindrical shape, a vertical flat-plate shape, a parallel-plate shape, a linear shape and a wire-mesh shape.

4. The electrification spray head according to claim 1, wherein a voltage of the water-side electrode unit is to be zero volts, the water-side electrode unit is led to earth, and a predetermined electrification voltage is applied to the induction electrode unit.

5. The electrification spray head according to claim 4, wherein the predetermined electrification voltage applied to the induction electrode unit is a DC, AC, or pulsed electrification voltage.

6. The electrification spray head according to claim 4, wherein the predetermined electrification voltage applied to the induction electrode unit is less than ±

20 kilovolts.

7. The electrification spray head according to claim 1, wherein part or all of the induction electrode is coated with an insulating material.

8. The electrification spray head according to claim 1, wherein the water-based fire-extinguishing agent is water, seawater, or water containing a fire-extinguishing power enhancing chemical agent.