JPH0630281Y2 - Nozzle for powder fire extinguishing agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a powder fire extinguisher nozzle, which is a nozzle for extinguishing both metal fires such as sodium and oil fires.

(Prior Art) In nuclear power plants and the like, sodium is used for cooling a nuclear reactor, but if this sodium leaks from a cooling pipe due to an accident, a sodium fire will occur.

In order to extinguish this sodium fire, a fire extinguishing agent nozzle for a general oil fire that is normally used cannot be extinguished because the extinguishing agent radiates vigorously and blows away the burning sodium. Therefore, a nozzle dedicated to sodium fire is used. This nozzle needs to be gently sprinkled so that the extinguishant forms a layer over the burning sodium.

When extinguishing an oil fire with a general linear radiating nozzle, the oil fire is flat and has a large area.Therefore, you must shake the nozzle to the left and right to radiate the fire extinguishing agent evenly on the fire surface. I can't quite extinguish the fire.

(Problems to be solved by the invention) Recently, a fire extinguisher capable of extinguishing both sodium fire and oil fire has been developed.

The present invention provides a nozzle capable of efficiently extinguishing a sodium and oil fire by appropriately switching the radiation state according to the fire situation using such a fire extinguishing agent.

(Means for Solving the Problem) This invention will be described with reference to FIG. 1 of an embodiment. A horn 2 having a larger diameter than the ejection port 1 is continuously provided at the ejection port 1 of the powder extinguishing agent of the nozzle, and the ejection port 1 is provided in the horn 2.
A plate 3 located in the front part of the horn 2 and having a ring-shaped clearance with the inner circumference of the horn 2 is rotatably supported by a shaft 4 orthogonal to the extinguishant, and the plate 3 is positioned at a right angle to the extinguishant jet flow. 40 to 6
A stopper 6 is provided so as to rotate and tilt at 0 degree and stop at the tilted position, and at the tilted position of this plate 3, the powder discharge flow is a nozzle for powder extinguishant that radiates from the horn 2 at a wider angle.

(Operation) For a sodium fire, the plate 3 is fixed so as to hit the radiation flow from the ejection port 1 at a right angle (solid line position in FIG. 1).
When the fire extinguishing agent is emitted from the nozzle in this state, the fire extinguishing agent emitted from the ejection port 1 collides with the plate 3, and the jet flow of the fire extinguishing agent passes through the ring-shaped gap between the baffle plate 3 and the horn 2. Radiated from horn 2. In this radiation situation, the fire extinguishing agent radiates softly, and it is possible to extinguish the fire by depositing the burning sodium on the sodium without blowing it off.

Next, when the plate 3 is rotated by a θ angle (40 to 60 degrees) and rotated to an inclined position as indicated by a dotted line, the plate 3 hits the stopper 6 and the inclination angle of the plate 3 is fixed. Thereby spout 1
The fire extinguishing agent flows from along the inclined surface of the plate 3 (the arrow in the drawing indicates the direction of the flow), further inclines against a part of the inner peripheral surface of the horn 2 and spreads to the left and right to be emitted.

Naturally, the radiation distance is large, unlike the case where it hits the plate 3 at a right angle,
Moreover, it spreads to the left and right and is useful for extinguishing a flat oil fire.

(Embodiment) In FIG. 1, a shaft 4 penetrates a horn 2, one end of which protrudes outside the horn 2, and a lever 5 is provided on the protruding portion.
The plate 3 can be rotated by rotating the lever 5.

The horn 2 is provided with a display (not shown) for displaying the position of the plate 3 at the turning position of the lever 5.

The jet 1 slightly projects into the horn 2, the edge of this projection forms a stopper 6, and the plate 3 hits the stopper 6 at a predetermined tilt position. The stopper 6 is not necessarily limited to the edge of the ejection port 1, and a protrusion may be provided separately.

Specifically, when the horn 2 has a diameter of 76 mm and a length of 100 mm, and when the inclination angle θ of the plate 3 is 40 to 60 degrees, the radiation angle of the extinguishing agent is wide and suitable for oil fires.

(Effect of device) This device can be used for both metal fire and oil fire extinguishing agents with one nozzle, and depending on the situation, the radiation suitable for the fire can be easily switched to surely extinguish the fire. In particular, in a flat fire with a large area such as an oil fire, the powder fire extinguishing agent emits in a wide angle, so that the fire extinguishing work is easy.

[Brief description of drawings]

 FIG. 1 is a sectional view of a nozzle showing an embodiment of the present invention. 1 ... Jet port, 2 ... Horn, 3 ... Plate

Claims (1)

[Scope of utility model registration request] 1. A horn having a diameter larger than that of the jet is provided continuously at the jet of the powder extinguishing agent, and the horn is located in front of the jet and has a ring-shaped gap with the inner circumference of the horn. Is supported by an axis orthogonal to the extinguishant discharge flow, and this plate is rotated and inclined by 40 to 60 degrees from a position perpendicular to the extinguishant discharge flow, and a stopper is provided at the inclined position to rotate the plate. A powder fire extinguisher nozzle that stops and the powder discharge flow radiates from the horn at a wide angle at this inclined position.