JPS588259Y2 - Dust-proof fire extinguishing nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dust-proof fire extinguishing nozzle used in gas fire extinguishing equipment.

Fire extinguishing equipment that uses gas-based extinguishing agents such as carbon dioxide and Halon 1301 is widely used for general fires as well as oil fires, but depending on the area to be extinguished, the fire extinguishing nozzle is required to have a dust-proof structure, so In terms of performance, it must always prevent dust from entering and function as a nozzle when extinguishing agent is released.

By the way, conventional dust-proof fire extinguishing nozzles either fit a cap into the opening of the horn that surrounds the nozzle body, or cover the nozzle with aluminum foil and tighten a band. If the cap is too loose, the cap will fall off, and if it is too stiff, the cap will be difficult to remove when extinguishing agent is released, and the latter requires time and effort to tighten with bands and bolts, and must be discarded after one use. It won't happen.

In this invention, a cover is slidably placed over a nozzle body with an orifice in its circumference, a spindle integrated with a piston that fits into the nozzle body is fixed to the end face of the cover, and a spring wrapped around the spindle pushes the piston forward. The orifice is closed by the cover, and the cover automatically opens the orifice by moving the piston under the pressure of the extinguishing agent. This simplifies processing and assembly, eliminates the above drawbacks of conventional products, and improves performance. We succeeded in producing a dust-proof fire extinguishing nozzle at low cost.

In the embodiment of the drawings shown in FIGS. 1 and 2, 1 is the nozzle body, which is made into a slightly elongated cylindrical shape with an end surface 2, and the base (
The threaded surface 3 cut on the outer periphery of the top end (top end) is connected to a fire extinguishing agent pipe (not shown), the outer circumferential surface of the lower half is slightly scraped to form a small diameter part 4 having a step 5, and the upper part of this small diameter part is A plurality of extinguishing agent discharge orifices 6 are opened at equal angles, and a bottomed cylindrical cover 7 is slidably covered over the entire small diameter portion.

Reference numeral 8 denotes a piston that fits airtightly into the inner circumferential surface of the nozzle body 1. A spindle 10 integrated with this piston is inserted into the end surface 2 of the nozzle body and fixed to the end surface of the cover 7 with a nut 9, so that the top end of the cover and the piston are fixed. 8 are aligned at approximately the same height and both are integrally connected by a spindle 10.

A spring 11 is wound around the spindle 10 and stretches the end face 2 of the nozzle body and the lower face of the piston 8. Its elasticity abuts the top end of the cover 7 against the step 5 of the small diameter part, and normally this cover closes the orifice 6. At this time, the piston 8 is located above the orifice 6 and closes the orifice inside the nozzle body.

Reference numeral 12 denotes a cylindrical backing housed in the lower part of the nozzle body, and an annular sharp ridge 13 is provided on the lower surface of the piston 8 opposite to this.

One embodiment of the present invention has the above-mentioned configuration. As shown in FIG.
Since the gap A between the small diameter part 4 and the cover 7 and the gap B between the step 5 of the small diameter part and the top end of the cover 7 are sufficiently small, dust cannot penetrate these gaps. It does not pass through and enter the inside of the nozzle body 1 from the orifice 6.

When the extinguishing agent is released, the pressure overcomes the elasticity of the spring 110 and pushes the piston 8 down to a position below the orifice 6 as shown in FIG. The agent is emitted radially from the orifice 6 and spread over a wide area.

At this time, the sharp edge 13 of the piston 8 is pressed against the backing 12 by the pressure of the extinguishing agent to form a valve seat.
Extinguishing agent will not leak from any location other than the orifice.

When the discharge of the extinguishing agent is finished, the pressure becomes zero, and the cover 7 and piston 8 rise due to the elasticity of the spring 11, returning to the state shown in FIG.

If the extinguishing agent is to be released in a directional manner,
As shown in the embodiment, a large diameter cylindrical horn 14 is placed over the nozzle body 1.

In this case, the threaded surface 3 of the nozzle body is screwed into the cap 15 on the top surface of the horn, and the threaded surface 16 of the cap is connected to a fire extinguishing agent pipe (not shown).

In the figure, 7 is a cover placed over the nozzle body 1, and 9 is a nut that fixes the end face of the cover to the spindle.

In addition, conventional dust-proof fire extinguishing nozzles either fit a cap into the opening 17 of the horn or cover this opening with aluminum foil and tighten it with a band, both of which have the above-mentioned drawbacks.

The above describes two embodiments of the present invention, and the present invention is not limited to these embodiments, and the design can be changed within the gist of the invention.

For example, the position of the cover 7 when the orifice 6 is closed is determined by applying its end face to the end face 2 of the nozzle body, so there is no need to provide the small diameter part 4 on the nozzle body for positioning the cover, but the step 5 of the small diameter part By abutting the top end of the cover 7 against the gap B, dust can be prevented from entering even in this gap B.

In this invention, a cover is slidably placed over a nozzle body with an orifice in its circumference, a spindle that is integrated with a piston that fits into the nozzle body is fixed to the end face of the cover, and a spring piston wrapped around the spindle is protruded. The structure is such that the orifice is closed by the cover, and the piston is moved by the pressure of the extinguishing agent to open the orifice. Normally, the cover covers the orifice of the nozzle body, so it is possible to reliably prevent dust from entering. When the extinguishing agent is discharged, the pressure moves the piston and the cover automatically opens the orifice, allowing it to fully function as a fire extinguishing nozzle.When the extinguishing agent is finished discharging, the cover automatically returns, reducing the hassle. It has many advantages, such as not requiring any process and is significantly easier to process and assemble than conventional products, and has the effect of making it possible to manufacture dust-proof fire extinguishing nozzles with excellent performance at low cost.

Further, if the nozzle main body is provided with a small diameter part and covered with a cover, and the top end of the cover is abutted against the step of the small diameter part, there is an advantage that dust can be prevented from entering even through this gap.

[Brief explanation of the drawing]

The drawings show two embodiments of the present invention. Fig. 1 is a sectional view of the first embodiment in normal operation, Fig. 2 is a sectional view of the first embodiment in operation, and Fig. 3 is a sectional view of the first embodiment when the horn is turned on. It is a front view of the 2nd example taken longitudinally. In addition, 1 is the nozzle body, 2 is its end surface, 4 is the small diameter part, and 5
is stage, 6 is orifice, 7 is cover, 8 is piston, 1
0 is a spindle, and 11 is a spring.

Claims (2)

[Scope of utility model registration request] (1) A bottomed cylindrical cover is freely slidable over a bottomed cylindrical nozzle body with an orifice in its circumference, and a spindle integrated with a piston that fits into the nozzle body is inserted into the end face of the nozzle body. The piston is fixed to the end face of the cover, the piston is pushed by a spring wrapped around the spindle, the cover closes the orifice, and the pressure of the extinguishing agent moves the piston, causing the cover to open the orifice. Dust-proof fire extinguishing nozzle. (2) The dust-proof fire extinguishing nozzle according to claim (1), wherein the nozzle body is provided with a small-diameter portion and covered with a cover, and the top end of the cover is abutted against the step of the small-diameter portion.