SU1463609A1 - Thermosensitive element - Google Patents

Abstract

The invention relates to anti-fire technology, in particular, to automatically operating starting devices of fire-fighting systems, and allows to increase their speed by improving the conditions of heat transfer. In the thermosensitive element (TCE), the walls of the sealed flask are ribbed with capillary channels communicated with a strip of the flask filled with low boiling liquid. At the same time, a reduced pressure is created in the cavity of the flask and TCE is supplied with electric heating means for its remote activation. Such an embodiment of a TCHE increases the response speed of its operation, the load capacity and reliability of operation under remote control, and also reduces the laboriousness of its manufacture and the cost of operation of the AUPS. 3 hp f-ly, 5 ill. e

Description

one

The invention relates to fire fighting equipment, in particular to automatic sprinkler fire extinguishing installations, and is intended for automatic start-up of water fire extinguishing sprinkler sprinklers, and can also be used in incentive automatic fire extinguishing systems for starting water pre-fouling, foamy and gas fire extinguishing systems.

The purpose of the invention is to increase the response speed of the thermal element by improving the heat transfer conditions.

FIG. 1 depicts a water sprinkler irrigator: FIG. 2 - thermo-sensitive element with electric heating means placed on the outer surface of the flask; in fig. 3 shows section A-A in FIG. 2; in fig. 4 - thermosensitive element with the option of filling the cavities of its ribs with a capillary-porous filler, longitudinal section; in fig. 5 is a section BB in FIG. four.

The thermosensitive element consists of a sealed flask 1, the walls of which are made in the form of ribs 2. The internal cavity of each of the ribs 2 of the flask 1 is made in the form of capillary tubes 3 and 4, communicating with the cavity 5 of the hermetic flask 1 (Fig. 1 and 3).

Capillary tubes 3 and 4 and hour -.-. The internal cavity 5 is typically filled with a low boiling liquid, and a reduced pressure is created in the cavity 5 of the flask.

The capillary tubes of the sealed flask 1 can be filled from a capillary-porous filler 6 in the form of sintered quartz sand or

II1

but

about: about:

with

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metal mesh, or wick cloth, or fiberglass (Figs. 4 and 5). To activate the temperature-sensitive element in the remote 1Control, a heating means 7 (not shown) is built into the cavity 5 of the hermetic: bulb 1.

The hermetic flask 1 of the temperature-sensitive element can be made with an electrical heating medium ICTBOM in the form of an electrically conductive paint 8 applied to the surface of the ribs 2 of the flask 1 (Fig. 2).

In the working position, the sealed flask 1 of the temperature-sensitive element holds the plug 9 in the openings of the refiner sprinkler and prevents the extinguishing agent from going outside.

 The thermosensitive element ra-: bots a trace: in a skinny way.

In the normal: “on-duty” condition of the sprinkler sprinkler, its outlet opening,) filled in the housing 10 | is closed with a stopper 9, preventing the extinguishing agent from exiting, extinguished under pressure in distribution piping of the automatic fire-fighting system. A sealed bulb 1 of the temperature-sensitive element presses the plug 9 and prevents its free exit from the opening of the sprinkler body 10.

When the temperature in the protected room rises to the temperature of opening the temperature-sensitive element (boiling point of low boiling liquid), heated gas flows heat the walls of the ribs 2 of the sealed flask. 1, as a result of which low-boiling liquid inside cavity 5 of flask 1 boils, creating an increased internal pressure, as a result of which the walls of flask 1 and its fins 2 collapse, P1) obk 9 is pushed out, giving free extinguishing to the extinguishing agent.

With the remote control, the thermosensitive element from the manual start buttons or from the sensors of the alarms signaling (not shown) electric current flows into the electric heating element 7, as a result of which low liquid sprays in the cavity 5 heats up and boils, and the sealed flask 1 collapses from the internal pressure. . When done elect0

five

five

The heating element 8 is made of electrically conductive paint deposited on the outer surface of the ribs 2 of the bulb 1, the electric current heats the electrically conductive paint and, accordingly, the walls of the ribs 2, as a result of which the low boiling liquid in the flask 1 boils and destroys it.

Making the flask walls of the heat-sensitive element in the form of ribs allows increasing the heating area of the flask, reducing the internal pressure in the cavity of the flask, which is necessary for its destruction due to the complex geometry of the walls of the flask and the bending forces acting on the flask walls, increasing the load capacity of the flask and, as a result, increases reliability and responsiveness of the temperature-sensitive element. Making the inner cavities of the ribs of the flask in the form of capillary channels communicating with the cavity of the flask, allows several times faster to increase the heating rate of the low-boiling liquid in the cavity of the flask, and thereby increase the response rate of the temperature-sensitive element.

The creation of a reduced pressure flask in the cavity allows an increase in the rate of heat transfer from the walls of the flask inwards to the low boiling liquid and thereby increase the response speed of the temperature-sensitive element.

The supply of a sealed bulb with an electric heating element increases its reliability and speed of operation. with remote control of the operation of the thermosensitive element from the backup fire protection systems.

The implementation of a thermosensitive element with an electrical heating element made of electrically conductive paint deposited on the outer surface of the flask reduces the laboriousness of manufacturing the bulb of the thermosensitive element.

Claims (4)

1. A thermostatic element containing a sealed flask with a low-boiling liquid placed in its cavity, characterized in that, in order to increase speed by improving heat transfer conditions, the wall of the flask is made in the form of ribs of capillary tubes. 2. The element according to claim 1, characterized in that, in order to enable the possibility of remote switching, it is provided with electric heating means. 3.Item on PP. 1 and 2, which is based on the fact that the electric heating means is made g of electrically conductive paint applied to the outer surface of the bulb. 4.Item on PP. 1-3, characterized in that the electrical heating means is placed 10, in the cavity of the flask. 1 FIG. 6-5 FIG. five