US 8,505,641 B2Granted

Electrification spray head

AssigneeHochiki Corporation

InventorsToshihide Tsuji, Tatsuya Hayashi, Tetsuo Yoshida

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Abstract

A wide protection range can be ensured by extending the flying distance of fire-extinguishing agent particles electrified and sprayed from a head. A water-based fire-extinguishing agent is pressurized and supplied to an electrification spray head 10 installed in a protection area A via a pipe, the jetted particles of the fire-extinguishing agent are electrified and sprayed from the electrification spray head 10. The electrification spray head mixes and sprays the fire-extinguishing agent having a comparatively small particle size included in a range from 30 μm to 200 μm by a small-particle jetting nozzle 38a and the fire-extinguishing agent having a comparatively-large particle size of 200 μm to 2000 μm by a large-particle jetting nozzle 38b, thereby carrying the group of the fire-extinguishing-agent particles having the small particle size by the air current caused by spraying the group of the fire-extinguishing-agent particles having the large particle size.

Claims4

Dependent claims

An electrification spray head comprising:

a small-particle head unit and a large-particle head unit which are laterally arranged adjacent to each other;
wherein the small-particle-size head unit has
(i) a small-particle jetting nozzle converting a water-based fire-extinguishing agent into particles having an average particle size within the range of 30 μm to 200 μm by jetting the agent to external space so as to spray the particles,
(ii) a water-current swirling core swirling a water current supplied to the small-particle jetting nozzle,
(iii) an induction electrode unit disposed in a jetting space side of the small-particle jetting nozzle, and
(iv) a water-side electrode unit disposed in the small-particle jetting nozzle and in contact with the water-based fire-extinguishing agent;
wherein the large-particle-size head unit has
(i) a large-particle jetting nozzle converting the water-based fire-extinguishing agent into particles having an average particle size within the range of 200 μm to 2000 μm by jetting the agent to external space so as to spray the particles,
(ii) a water-current swirling core swirling a water current supplied to the large-particle jetting nozzle,
(iii) an induction electrode unit disposed in a jetting space side of the large-particle jetting nozzle, and
(iv) a water-side electrode unit disposed in the large-particle jetting nozzle and in contact with the water-based fire-extinguishing agent;
and
wherein an external electric field is generated by applying a voltage between the induction electrode units and the water-side electrode units of the small-particle-size head unit and the large-particle-size head unit to the water-based fire-extinguishing agent being subjected to a jetting process by the small-particle jetting nozzle and the large-particle jetting nozzle so as to electrify the jetted particles.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/728,251Filed 27 Dec 2012 · continuation
Priority: 27 Apr 2009
Published: US 2013/0119169 A116 May 2013
Granted: 13 Aug 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

A62C 35/00
Permanently-installed equipment
A62C 31/02
Delivery of fire-extinguishing material: nozzles specially adapted for fire-extinguishing
A62C 99/0072
Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames: using sprayed or atomised water
A62C
Fire-fighting

Family

PCT/JP2009/058246Parent of this continuation · filed 27 Apr 2009
Application13/232,066Parent of this continuation · filed 14 Sep 2011
US 2013/0119169 A1Pre-grant publication · published 16 May 2013
US 8,365,836 B2Parent of this continuation
US 2012/0000677 A1Published application
US 8,505,641 B2This patent

From the US filing history. Foreign family members aren’t listed.