SU1574227A1 - Fire-extinguisher - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to fire fighting equipment, namely, fire extinguishers with separate containers for extinguishing agent and compressed gas. The aim of the invention is to improve the reliability and simplify the design of the fire extinguisher. The essence of the technical solution is that the locking-reducing valve is equipped with a needle with a conical surface at the end fixedly mounted on its lower piston and installed above the membrane, and the valve seat located under the membrane is made in the form of a conical surface equidistant to the conical surface of the needle. 1 il.

Description

FIELD OF THE INVENTION The invention relates to fire fighting equipment, namely, fire extinguishers with separate containers for extinguishing agent and compressed gas.

The aim of the invention is to improve the reliability and simplify the design of the fire extinguisher.

The drawing shows a schematic diagram of a fire extinguisher.

The fire extinguisher consists of a tank 1 with a siphon tube 2, a feeding device 3 and a cylinder 4 with compressed gas. The fire extinguisher cover 5 is equipped with a device for maintaining the required pressure differential between the tank and the environment, consisting of a housing 6 with channels 7 and 8 and a nozzle 9. Inside the housing 6 there are a restrictive ring 10 and a locking-reducing valve.

A valve consisting of pistons 11 and 12 connected by a rod 13 and a needle 14 fixedly fixed on the lower piston 12 with a conical surface 15 on the end. Underneath the upper piston 11, a crimping pin 16 is installed, sealed at a predetermined working pressure in the tank. A fitting 17, which is connected to the housing 6, is screwed into the neck of the cylinder 4. The outlet channel 18 from the cylinder 4 under the membrane 19 is made in the form of a conical surface 21, an equidistant conical surface 15 of the needle 14, and is a valve seat. The inner part of the body 6 of the pistons 11 and 12 is divided into upper, middle and lower cavities. Upper and lower cavities by channels 7

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and 8 is connected to reservoir 1. The middle cavity is connected to the surrounding atmosphere by nozzle 9. The cover 5 is equipped with a fire extinguisher starting device consisting of a stem 22 with a disk 23, a release spring 24, a valve 25 and a safety check 26, the hole in the top of the cover 5 and the stem 22 form an annular channel 27 through which the tank 1 when stored charged a fire extinguisher is associated with the environment.

The fire extinguisher works as follows.

To start the fire extinguisher, the safety vault 26 is pulled out and sharply pressed onto the disk 23. At the same time, the springs 24 and 16 are compressed, the pistons 11 and 12, the rod 13 and the needle 14 move down and the membrane 19 is pierced, the disk 23 is released. The action of the force of the spring 24 Itok 22 rises by iodine and the valve 25 closes the annular channel 27 "With the force of the spring 16 and the pressure of the compressed gas, the pistons 11 and 12 occupy the upper extreme position, while the piston 11 is pressed against the restrictive ring 10, the compressed gas through By the needle 14, the hole in the membrane 19 from the cylinder 4 is throttled in the channels 8, enters the tank 1 and forces the extinguishing agent through the siphon tube 2 to the delivery device 3. After piercing the membrane 14 by the needle 14, the intact part of it deforms c and takes the shape of the conical surface 21 of the valve seat, being an insert and a damper. The working pressure in the tank is established due to the equilibrium of the pressure forces acting on the piston 11 from the upper cavity and the elastic forces of the brigade 16 together with the pressure forces of the ambient gas acting on the piston 11 from the middle cavity.

If the pressure in tank 1 exceeds the established working pressure, then due to this pressure on the piston And from the upper cavity, the stop-reducing valve moves downwards and the conical surface 15 of the needle 14 closes the outlet channel 18 of the cylinder 4. In this case, the seal of the output channel occurs as in a needle valve , namely pressing the needle 14 to the saddle 21, the surface of which is

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The upper part is sealed with the intact part of the membrane 19. At the same time, it plays the role of the sealing element and the damper simultaneously.

After relieving the overpressure due to the flow of the extinguishing agent from the tank 1 through the feeding device 3, the shut-off valve under the action of the spring 1 6 and the gas pressure from the cylinder 4 reopens: the needle 14 with the pistons 12 and 11, the rod 13 rises, open the output channel 18,

Thus, during the operation of the fire extinguisher, the locking-reducing valve performs cyclic reciprocating up and down movements, which in the upper position are limited by the restrictor ring 10, and in the lower position by the valve seat 21.

With increasing pressure in the environment, the pressure acting on the piston 11 from the middle cavity increases. As a consequence, to close the shut-off valve, an increased pressure is required in the upper cavity, and hence in reservoir 1, which exceeds the set operating pressure by an amount equal to the pressure of the gas in the environment. Thus, the pressure drop in tank 1 and the environment will be constant and the amount of extinguishing agent supply will not change significantly.

The use of channels 8 for additional throttling of the gas supplied to tank 1 from cylinder 4 provides the most accurate maintenance of the established working pressure in the tank when the fire extinguisher is operating,

The reliability of the tightness of the seal of the outlet channel of the cylinder 4 and the preservation of gas pressure over the entire storage period of the charged fire extinguisher is ensured by the membrane 19 pressed against the recess 17 by the nut 20 with an external thread.

The invention allows to increase the reliability and simplify the design of the fire extinguisher due to the fact that the locking-reducing valve is equipped with a needle with a conical surface at the end fixedly mounted on its lower piston and installed above the membrane covering the exit

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the channel from the cylinder with compressed gas, and the valve seat, located under the diaphragm, made in the form of a conical surface, equidistant conical surface of the needle.

Claims (1)

Invention Formula A fire extinguisher for rooms with increased pressure, containing a tank filled with an extinguishing agent, with a lid, a siphon tube and a feeding device, a cylinder with compressed air and a spring-loaded porn reduction valve, which is such that, in order to increase reliability and simplify the design, the stop-reducing valve is equipped with a needle with a conical surface at the end fixedly mounted on its lower piston mounted above the membrane, closing the outlet channel of the cylinder of compressed gas, and the valve seat, located under the diaphragm, made in the form of a conical needle surface. /four Editor E. Kopcha Compiled by V.Sapronov Tehred M. Khodanich M. Samborska Proofreader Order 1737 Circulation 379 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Subscription