RU2450838C1 - Plant for foam supply into fire zone - Google Patents

Abstract

FIELD: fire safety.

SUBSTANCE: invention relates to automatic fire-fighting plants. A plant for foam supply into a fire zone comprises a body with supply and drencher chambers, separated with a seat, a cover with a booster chamber. In the chamber there is a main slide, comprising a membrane jammed between the body and the cover, a plate and a bushing with an opening. The control slide is connected to a drive and is installed separately from the main slide. The supply chamber is placed inside the drencher one, at the outlet of which there are foam generators fixed. The outlet from the supply chamber is arranged in the form of a seat. The supply and booster chambers are additionally connected to each other by a calibrated opening. The foam generator comprises a body, distributing and guiding devices. The body is made in the form of a pipe, to one end of which a pump set is connected, and at the other end there is a conical nozzle. On the nozzle there is a generating element installed from a net arranged in the form of a rotary ellipsoid. On the body there is a foaming solution distributor arranged in the form of a package of alternating throttling orifices. There are openings connected to each throttling orifice and arranged at the angle of 120° to each other. Between throttling orifices there are perforated conical discs connected accordingly with bushings installed on the body, at the same time on peripheral surfaces of the perforated discs there is a diffusor installed, made of a generating net.

EFFECT: higher efficiency and reliability of plant operation due to application of foam generators, and also simplified design.

1 cl, 2 dwg

Description

The invention relates to fire fighting equipment, namely to automatic fire installations used to extinguish fires in fire hazardous industrial premises.

The closest in technical essence and the achieved effect to the invention is a device according to RF patent No.2016598 for supplying extinguishing fluid to a fire fighting installation, comprising a housing with a deluge and interconnected supply and induction chambers, a shut-off valve with a membrane mounted on the stem and separating the supply and the deluge of the chamber, the poppet valve and the kinematically associated relief valve connecting the induction chamber to the atmosphere, and the shutoff valve stem has a through the channel and is equipped with a rigidly connected to it and coaxially mounted head with a cavity, a communicating rod channel with a stimulating chamber, and a poppet valve is placed in the head cavity.

The disadvantages of this technical solution are the design complexity and low reliability of the device, as well as the absence of a foam generator, the presence of which is dictated by a high degree of fire hazard in industrial premises.

A technically achievable result is an increase in the efficiency and reliability of the installation due to the use of foam generators, as well as simplification of the design.

This is achieved by the fact that in the installation for supplying foam, comprising a housing with a supply and deluxe chambers separated by a saddle, a cover with a motive chamber in it, a main spool consisting of a membrane pinched between the body and the cover, plates and bushings with a hole, a control spool associated with the drive, the feed chamber is located inside the deluge, the exit from the feed chamber is made in the form of a saddle, the feed and induction chambers are additionally interconnected by a calibrated hole made in the main ash bushing The nickname, the control spool is installed separately from the main spool in the cover of the induction chamber with the possibility of blocking the discharge openings, the cross-sectional area of which is larger than the cross-sectional area of the calibrated hole in the main spool bushing, and foam generators are fixed at the outlet of the deluge chambers, each of which contains a housing, distribution and guide devices while the housing is made in the form of a cylindrical pipe with a main hole, one end of which is used to connect to a pump installation, and at the other end there is a conical nozzle with a confuser ending in a throttle aperture, and a mesh generating element made in the form of an ellipsoid of revolution is installed on the nozzle, and a foam dispenser made in the form of a packet of alternating throttle washers is installed on the casing of the foaming agent solution, in which throttle holes are made with an inclination towards the generating element, respectively connected with holes in the housing, with each of the throttle at least three holes are connected that lie in a plane perpendicular to the axis of the housing and are located at an angle of 120 ° to each other, and perforated conical disks are installed between the throttle washers, respectively connected to the bushings mounted on the housing, on the peripheral surfaces of the perforated discs there is a diffuser made of a generating grid.

Figure 1 shows a diagram of an installation for supplying foam to the fire zone, figure 2 is a diagram of a foam generator polydisperse foam.

Installation for supplying foam into the fire zone (Fig. 1) consists of a housing 1 with a supply 2 and a deluge 3 cameras, with foam generators 17 mounted on them, as well as a stimulation chamber 4 located in the lid cavity 7 above the shut-off valve-membrane 5 with through a calibrated hole 6. In the cover 7 there is a relief valve 8 connected by a rod 9 to the actuator 10. A pipe 11 with a thermal lock 12 is connected to the cover 7. The pipe 11 is connected through a valve 13 with a pressure (supply) pipe 14, which is connected through a valve 15 to feed chamber 2. In to the base 1 of the deluge chamber 3 under the valve-membrane 5 is made of the supporting ribs of the lattice 16.

Each of the foam generators 17 (FIG. 2) consists of a housing 18 made in the form of a cylindrical pipe with a main hole 19, one end of which is used to connect to a pumping unit (not shown in the drawing), which supplies the foaming solution from the metering tank or fire machine (not shown), and at the other end there is a conical nozzle 20 with a confuser 21 ending in a throttle hole 26, and a mesh generating element 25 made in the form of an ellipsoid of revolution is mounted on the nozzle.

On the supply side of the foaming agent solution, a foam dispenser is installed on the housing 18, made in the form of a packet of alternating throttle washers 27, 28, 29, in which the throttle holes 30, 31, 32 are made with an inclination towards the generating element 25, connected respectively to the holes 22 , 23, 24 in the housing 18, with each of the throttle washers 27, 28, 29 connected to at least three holes lying in a plane perpendicular to the axis of the housing 18 and located relative to each other at an angle of 120 °. Between the throttle washers, perforated conical disks 33, 34, 35 are mounted, connected respectively to bushings 36, 37, 38 mounted on the housing 1. To form a targeted jet of high-pressure foam, a diffuser 39 made of generating grid. The generator is installed directly above the zone of possible ignition; the length of the created jet in the horizontal or vertical position of the generator does not exceed 1.8 m.

Installation for feeding foam into the fire zone works as follows.

In the standby state, the relief valve 8 overlaps the openings in the cover 7 connecting the induction chamber 4 to the atmosphere. The thermal lock 12 is closed, the pressure above the shut-off valve-membrane 5 is maintained through a through calibrated hole 6 connecting the supply chamber 2 to the induction chamber 4. The valve 13 is closed, and the valve 15 is open. The shut-off valve-membrane 5 closes the supply chamber and separates it from the deluge chamber 3. When a signal is received from the sensor of the stimulation system, the actuator 10 of the relief valve 8 is activated and openings in the cover 7 open through which liquid from the stimulation chamber 4 is discharged into the atmosphere.

In this case, the valve-membrane 5 due to the pressure difference in the supply chamber 2 and the induction chamber 4 rises, and the cavities of the supply and deluge 3 chambers communicate with each other. The extinguishing fluid is directed into the deluge chamber and then to the extinguishing installation.

To bring the device into standby state, the relief valve 8, the thermal lock 12 and the valve 15 are closed. The valve 13 is opened until the required pressure in the induction chamber 4 is reached, and the valve 15 is opened. The shut-off valve-membrane 5 is pressed against the seat of the supply chamber 2 due to the difference in area , which are affected by fluid pressure in the stimulating 4 and supply 2 chambers. Maintaining equal pressure in these chambers 4 and 2 is carried out through a calibrated through hole 6 in the valve-membrane 5. The valve 13 is closed, and the locking-starting device is put into a standby state.

The foam generator is installed directly above the zone of possible ignition, in a horizontal or vertical position.

The polydisperse foam generator operates as follows.

In the event of a fire, the foaming agent solution is supplied from the metering tank (not shown in the drawing) to the housing 18, from where it is supplied through the foam dispenser under pressure through throttle washers 27, 28, 29 to the perforated disks 33, 34, 35, on which due to ejection air foam forms. At the beginning of the plume, the sprayed spray of the foaming agent solution has the highest speed and when it gets onto the perforated disks, foam with small bubbles (2-3 mm across) is formed, with the distance from the throttle openings, the jet velocity drops and then foam with larger bubbles forms on the disks ( 4-12 mm across). Thus, the generator produces a polydisperse high-fold foam, which has the property of rapid spreading over the surface, and even in conditions of intense smoke, the foam is formed in predetermined volumes and has good resistance to disintegration.

As a foaming agent in such fire extinguishing systems, a fluorosynthetic foaming agent of the type “Multipena” or a 6% aqueous solution of fluorinated foaming agent “Sublayer” is used.

The polydisperse foam generator is designed for automatic fire extinguishing systems of closed technological rooms (supplying foam to the place of ignition), where steam and gas-air mixtures are possible, for example, in pump rooms of oil pumping stations, pressure control chambers, etc.

Claims (1)

Installation for supplying foam into the fire zone, comprising a housing with a supply and deluge chambers separated by a saddle, a cover with a motive chamber in it, a main spool consisting of a membrane pinched between the body and the cover, plates and bushings with an opening, a control spool associated with drive, characterized in that the feed chamber is located inside the deluge, the outlet from the feed chamber is made in the form of a saddle, the feed and induction chambers are additionally connected by a calibrated hole, made mainly in the sleeve o spool, the control spool is installed separately from the main spool in the cover of the induction chamber with the possibility of overlapping discharge openings, the cross-sectional area of which is larger than the cross-sectional area of the calibrated hole in the main spool sleeve, and foam generators are fixed at the outlet of the deluge chambers, each of which contains a housing, distribution and guide devices, while the housing is made in the form of a cylindrical pipe with a main hole, one end of which is used to connect to the pumping unit the cone, and at the other end there is a conical nozzle with a confuser ending in a throttle hole, moreover, a mesh generating element made in the form of an ellipsoid of rotation is installed on the nozzle, and a foam dispenser made in the form of an alternating packet is installed on the casing side of the foaming agent solution throttle washers, in which throttle openings are made with an inclination towards the generating element, respectively connected with holes in the housing, with each of the throttle At least three openings connected at least three holes lying in a plane perpendicular to the axis of the housing, and located relative to each other at an angle of 120 °, and between the throttle washers mounted perforated conical disks connected respectively to the bushings mounted on the housing, this on the peripheral surfaces of the perforated discs installed diffuser made of a generating grid.

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