SU1156707A2 - Fire-extinguisher for rooms with over pressure - Google Patents

Abstract

FIRE EXTINGUISHER FOR PREMISES WITH INCREASED PRESSURE, according to author. St. No. 700144, characterized in that, in order to increase reliability, it is provided with a movable seat disposed in the lower cavity of a shut-off valve, having on the one hand axial and radial through channels connected to each other, and on the other a needle, a pressing spring and a sleeve with a membrane fixed on the neck of the compressed air cylinder, the axial and radial channels being connected to the cavity of the fire extinguisher tank, and the pressing spring is placed between the sleeve and the seat, while the needle of the saddle is installed above the membrane and the seat about to come into contact with the additional piston spring-loaded shut-off and pressure-reducing valve.

Description

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about

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The invention relates to fire fighting equipment, namely, fire extinguishers with separate tanks for fire extinguishing agents and compressed gas, and is an improvement of the known fire extinguisher for rooms with increased pressure according to the author. St. No. 700144.

The aim of the invention is to increase the reliability of the fire extinguisher.

The drawing shows a schematic diagram of the 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. On the fire extinguisher cover 5, a device is installed to maintain the necessary pressure drop between the tank and the environment, consisting of a housing with nozzles 7-9. Inside the housing 6 there is a locking and reducing valve 10, made in the form of pistons 11 and 12 connected by a rod 13, a spring 14, a movable seat 15 having axial 16 and radial 17 channels connected to each other on one side and a needle 18 and a pressing spring 19. A fixed seat 20 connected by a sleeve 21 with a membrane 22 is connected to the housing 6. The axial 16 and 17 radial channels are connected to the fire chamber of the reservoir, and the pressing spring 19 is placed between the sleeve 21 and the movable saddle 15, while the needle 18 is installed above the membrane 22, and the movable seat 15 is in contact with the piston 12. The inner cavity of the body 6 of the pistons 11 and 12 and the seat 15 is divided into upper, middle, intermediate and lower cavities. The upper, intermediate and lower cavities of the pipes 7 and 8 and the channels 16 and 17 are connected to the cavity of the reservoir 1. The middle cavity by the pipe 9 - with the surrounding atmosphere. On the lid 5, a fire extinguisher starting device is installed, consisting of a rod 23 with a disk 24, a pressing spring 25, a valve 26 and safety checks 27. At the top of the cover between the housing and the rod 23 there is an annular channel 28 connecting the internal cavity of the tank 1 with the surrounding the atmosphere.

The fire extinguisher works as follows.

To start the fire extinguisher, the safety check 27 is pulled out and the hand is sharply pressed onto the disk 24, after which the hand is removed from the disk 24. The springs 14, 19 and 25, the pistons 11 and 12, the brush 13, the movable seat 15 with the needle 18 are compressed down and the needle 18 pierces the membrane 22. After removing the hand from the disk 24 under the force of the spring 25, the rod 23 rises up and the valve 26 closes the channel 28. The spring force 14 of the wheels 11 and 12 occupy the upper position, and the spring force 19 and the pressure of the compressed gas movable seat 15 with needle 18 rises and r Pinned to the restrictive collar of the housing 6. Compressed gas through the hole formed in the membrane 22 when pricked by the needle 18 from the cylinder 4, throttled in the radial and central channels 16 and 18 and the pipe 8, enters the tank 1 and displaces the extinguishing agent from it through the siphon tube 2 to the delivery device 3. The required working pressure in the fire extinguisher tank 1 is established due to the balance of the pressure forces acting on the piston 11 from the upper cavity and the elastic forces of the spring 14 together with the forces of the groove of the environment acting on Porschen 11 through the middle. cavity.

If the pressure in the tank exceeds the set working, then under the action

 of this pressure on the piston 11 from the side of the upper cavity, the locking-reducing valve 10 closes the axial channel 16 in the movable seat 15, and the supply of compressed gas from the cylinder 4 to the internal cavity

5 tank 1 is terminated. After the excess pressure has been relieved due to the flow of the extinguishing agent from the reservoir 1 through the feeding device 3, the valve 10 is opened again by the force of the spring 14. When the ambient pressure increases, the force acting on the piston 11 from the middle cavity increases. As a consequence, the valve 10 closes at an elevated pressure in the upper cavity, and consequently, in the tank 1, with the operating pressure exceeding the established pressure by an amount equal to the pressure of the ambient gas. Thus, the pressure differential between the cavity of the fire extinguisher tank and the environment will be constant, and the amount of supply of the fire extinguishing agent will not change significantly.

The use of axial 16 and 17 radial channels for throttling the gas flowing from cylinder 4 to tank 1 provides the most accurate maintenance

 required pressure in reservoir 1 when operating fire extinguisher. The tightness of sealing the output channel of the cylinder 4 and preserving the supply of compressed gas over the entire storage period of the charged fire extinguisher is provided by the membrane 22 pressed against the seat 15 by the sleeve 22. All this increases the reliability of the fire extinguisher.

The creation of fire extinguishers equipped with 5 locking and reducing valves with a movable seat, having a needle and throttling channels, as well as sealing the output channel of the balloon with a membrane pressed to the saddle with a sleeve, will increase the efficiency of their use and, consequently, increase fire protection in medical stations, as well as other rooms with high pressure gas environment.

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Claims (1)

FIRE EXTINGUISHER FOR ROOMS WITH RISED PRESSURE, by author. St. No. 700144, characterized in that, in order to increase reliability, it is equipped with a movable seat located in the lower strip of the shut-off-pressure valve, having axial and radial through channels connected to each other, and on the other hand a needle, a pressure spring and a sleeve with a membrane mounted on the neck of the compressed air cylinder, the axial and radial channels being connected to the cavity of the fire extinguisher tank, and the clamping spring is located between the sleeve and the seat, with the needle of the seat mounted above the membrane and the seat installed in zmozhnostyu additional piston into contact with the spring-loaded shut-off relief valve.