SU1639668A1 - Fire barrier - Google Patents

Abstract

The invention relates to fire fighting equipment, in particular, to fire-blocking devices that prevent the spread of flame and explosion in pipelines for transporting flammable and explosive gases, and allows for increased reliability of operation. The arrester includes a housing with inlet and outlet fittings, a divider with a conical surface, around the periphery of which holes perpendicular to it are uniformly located, connected to the outlet nozzle channel, a distance ring located between the divider and the fire-extinguishing element installed on the inlet fitting side, a cut-off valve made in the form of a screen with petals of a streamlined shape made of a material with a shape memory effect, for example titanium nickelide. 5 il.

Description

The invention relates to fire fighting equipment, in particular to fire-blocking devices that prevent the spread of flame and explosion in pipelines.

The purpose of the invention is to increase the reliability of work.

FIG. 1 shows a flame arrester, longitudinal section; figure 2 - section aa in figure 1; on fig.Z - screen, front view; figure 4 - section bB in fig.Z; figure 5 - Flame arrest during the explosion of the gas mixture.

The arrester includes a housing 1 with an inlet nozzle 2, a channel 3 and a cavity 4, a divider 5 with a conical surface 6, holes 7, drilled perpendicularly to the conical surface 6 evenly around the circumference, a channel 8 connected to the holes 7, and an outlet nozzle 9. Between the housing 1 and the divider 5, there is a fire blocking element 10, which through the spacer ring 11, the screen 12 and the gasket 13 is pressed by the nut 14. Moreover, the screen is made with petals 15 (FIG. 3) in an amount equal to the number of holes 7 and fixed with a pin 1 6. The petals are oriented so that, in the event of a backward impact, when a gas explodes, gas jets are deflected by petals 15, which have a streamlined shape (FIG. 4), which does not create resistance to the direct gas flow, towards the periphery. The screen is made of a material with a shape memory effect, for example titanium nickelide.

The arrester operates as follows.

The gas mixture through the fitting 2 of the housing 1 through the channel 3 passes into the cavity 4 through the fire-blocking element 10, bending the petals 15 of the screen 12, deflects with a conical surface 6 to the holes 7 located on the periphery of the conical surface 6, and through the holes 7 passes

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channel 8 output choke 9 divider.

In the case of an explosion of the gas mixture in the pipeline, the explosion flame and the incandescent combustion products pass through the outlet 9 through the channel 8 of the splitter 5, the orifice 7, where they are cut into separate streams, due to which the propagation velocity of the blast wave is significantly reduced, then gas jets fall on the petals 15 of the screen 12, in connection with which the gas velocity is still reduced, the gas jets deviate to the periphery and twist, forming turbulent flows that give off heat to the body. When a stream of hot gases hits the petals 15 of the screen 12 made of a material with a shape memory effect, such as titanium nickelide, the petals heat up and change their

form (figure 5), block the holes 7 and thereby block the release of gas and isolate the source of the explosion. The plum extinguishes, the gas temperature drops to a temperature below the gas ignition temperature, the temperature of the screen petals decreases and the petals take their original shape (Fig. 1) and the flame arrestor is ready for operation without disassembly.

Claims (1)

Invention Formula The arrester comprising a housing with inlet and outlet fittings and a fire-blocking element installed in the housing, a flow divider with openings for the passage of the medium and a shut-off valve, in order to improve the reliability of operation, the divider is made in the form of a solid body with a conical base facing the inlet side spigot are channels in the body of the dissector, communicating with the inlet nozzle and emerging to the surface of the conical base, the shut-off valve is a screen with streamlined petals located under the inlet openings of the channels and made of a material with a shape memory effect that can overlap the input channel openings, while fire blocking the element is located under the shut-off valve. Rig.Z 1639668 HELL Fig 2 / 2 Bv PiLr. L, J Fig 5