JPH0223332Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a foam fire extinguishing agent nozzle for oil tanks.

When electrical discharge machining is performed on a workpiece in the oil tank of a conventional electrical discharge machine, when the oil ignites due to electrical discharge,
Radiation nozzles that eject foam extinguishing agent to extinguish fires are well known, but these radiation nozzles generally have a wire mesh or the like attached to the jet nozzle, and their extinguishing range is relatively narrow. The oil tends to splatter, and its extinguishing ability is relatively low. The present invention has been proposed to solve these problems, and will now be described with reference to embodiments shown in the drawings.

A is a radiation nozzle body that is attached to the peripheral wall of the upper part of the oil tank, and the nozzle body A consists of an introduction part a and a spout part b, and the introduction part a has a fire extinguisher hose installed at an appropriate position outside the oil tank. A connecting screw 1,
In addition to providing an inlet 2 for extinguishing agent inside,
A radiation plate 5 having a plurality of extinguishing agent discharge holes 4 is interposed in the stepped portion 3, and below it there is a reflection turbulent flow chamber 6 for extinguishing agent and a squeezing turbulent flow chamber 7 for extinguishing agent smaller in diameter than the turbulence chamber. The squeezing turbulent flow chamber 7 is expanded and communicated with the expanded air suction chamber 8 of the ejection part b. The ejection part b is a hexagonal enlarged part that continues below the introduction part a, and has an air suction port 9 around its upper part, and an air suction chamber 8 with an enlarged circular cross section inside. The extinguishing agent is mixed with air and foamed to form a foam extinguishing agent, and the foam extinguishing agent injection chamber 10 is located below the inlet 9 in the air suction chamber.
At the same time, the bag-shaped wire meshes 11, 11 are attached in a double layer, and an inclined reflecting plate c is separately secured at an appropriate distance from the lower end of the injection chamber 10 by bolts 13 using its mounting plate 12. The reflector allows fire extinguishing foam to be sprayed directly onto the surface of the oil tank. The shape of the reflector c is preferably a tongue-like shape with a substantially circular front end, as shown in FIG. Figure 5 shows the radial nozzle A installed on the upper peripheral wall of oil tank d horizontally with respect to the oil surface, and Figure 6 shows the state in which the radial nozzle A is installed on the upper peripheral wall of oil tank d with the radial nozzle A facing downward with respect to the oil surface. 4 is a fire extinguisher, 15 is a fire extinguishing agent conduit, 16 is a connecting fitting, 17 is a sensor, 18 is a magnetic starting part, 19 is a fixing fitting, and 20 is a saddle band. It is.

Furthermore, in another embodiment, as shown in FIGS. 7 and 8, depending on the location (height from the oil surface) where the fire extinguishing foam is sprayed, there is a reflector c attached to the spout part b, on the opposite side. Attach another reflector c ₁ and apply fire extinguishing foam 2
The light may be heavily reflected so as to be reflected over a wide range.

The present invention configured as described above is designed to prevent a fire from occurring due to oil igniting during electrical discharge machining of a workpiece in the oil tank d of an electric discharge machine, etc. The sensor 17 activates the magnet actuator 18 to eject fire extinguishing agent from the fire extinguisher 14, guide it to the radiation nozzle A through the conduit 15, and inject the foam fire extinguishing agent from inside the radiation nozzle. The agent passes through the radiation plate 5 of the introduction part a, is turbulent in the turbulent flow chamber 6 and the squeezing turbulent flow chamber 7, and is introduced into the enlarged air suction chamber 8 of the jetting part b, and the air from the suction port 9 is It is inhaled and foamed to become a foam extinguishing agent, and then turned into a finer turbulent foam extinguishing agent by the bag-shaped wire meshes 11, 11, which is applied to the reflector c and directly sprayed over a wide range along the oil tank surface. A fire extinguisher that can quickly extinguish the fire by
Therefore, the fire extinguishing foam does not scatter the fire oil on the oil tank surface, and has the effect of extinguishing the fire by spraying it over a wide area approximately parallel to the oil tank surface.

[Brief explanation of the drawing]

Fig. 1 is a front view, Fig. 2 is a longitudinal sectional view, Fig. 3 is a sectional view taken along line XX in Fig. 2, and Fig. 4 is a plan view of the reflector.
Fig. 5 is an overall view showing the radiation nozzle attached to the peripheral wall of the upper part of the oil tank, Fig. 6 is a view showing another embodiment, and Fig. 7 is a front view showing another embodiment of the radiation nozzle. Figure 8 is a side view of the same. A...Radiation nozzle, a...Introduction part, b...Ejection part, c, c ₁ ...Reflection plate, d...Oil tank, 8...Air suction chamber, 9...Air suction hole, 10... injection chamber,
11,11...wire mesh.

Claims (1)

[Scope of utility model registration request] In the foam extinguishing agent injection nozzle A, which consists of a fire extinguishing agent introduction part a, a turbulent flow creating part, an air-mixing foaming part, and a spouting part b, the turbulent flow creating part is connected to a turbulent flow chamber 6 and a turbulent flow having a smaller diameter than the turbulent flow chamber. The air-mixing bubbling section that is continuous with this chamber is divided into an enlarged air suction chamber 8 by increasing its diameter.
Furthermore, the injection chamber 10 is provided with bag-shaped wire meshes 11, 11.
1. A fire extinguishing foam emitting nozzle for an oil tank, characterized in that at least one reflective plate (c) is obliquely attached to the lower end of the injection chamber (10) at an appropriate interval.