PL158337B3 - Linear detector of fire of waring fire protection installation - Google Patents

Abstract

Line fire detector of a warning fire protection system containing an external electrode in the form of a protection tube, inside which an internal electrode in the form of a wire is placed around the active element layer, and containing an electric insulator situated in the area between the internal electrode and external electrode, and the internal electrode with the electric insulator is covered with a thin layer of active element and placed inside the external electrode in such a manner that between the electric insulator and internal wall of the external electrode, along the detector, there is an airspace, and the electric insulator, by means of the active element layer, contacts, in a point wise manner, the internal wall of external electrode according to patent No. 138 268 characterized in that the electric insulator (2) is made of a weave of fibres, preferably glass or asbestos fibres.<IMAGE>

Description

REPUBLIC

POLAND

© PATENT DESCRIPTION © EN © 158337 © B3

Filing number: 268449 (ó) Filing date: October 27, 1987

IntCl ⁵ :

G08B 17/06

Patent Office of the Republic of Poland

Additional patent to the patent:

138268 08/13/1982

Linear fire detector of a fire warning system

Application announced:

May 2, 1989 BUP 09/89

The holder of the patent:

Warsaw University of Technology, Warsaw, PL

Inventors:

Kazimierz Gryczyński, Warsaw, PL Witold Kotlewski, Warsaw, PL Jan Pawlikowski, Warsaw, PL Zbigniew Wieryszko, Warsaw, PL Marek Adamowicz, Warsaw, PL

The grant of the patent was announced on: August 31, 1992, WUP 08/92

Linear fire detector for warning fire protection, consisting of an outer electrode in the form of a casing tube, inside which is placed an inner electrode in the form of a wire, surrounded by an active element layer, containing an electrical insulator placed in the space between the inner electrode and the outer electrode, with the inner electrode together with the electric insulator, it is covered with a thin layer of the active element and is embedded inside the outer electrode so that an air space is formed between the electric insulator and the inner wall of the outer electrode along the length of the detector, and the electric insulator, through the layer of the active element, is in contact with the inner wall of the electrode according to the patent No. 138 268, characterized in that the electrical insulator (2) is a weave of fibers, preferably glass or asbestos.

Claims (1)

LINEAR FIRE DETECTOR Patent claims Linear fire detector of a warning fire protection system, consisting of an outer electrode in the form of a casing tube, inside which an inner electrode in the form of a wire is placed, surrounded by an active element layer, containing an electrical insulator placed in the space between the inner electrode and the outer electrode, the inner electrode with the electric insulation is covered with a thin layer of the active element and is embedded inside the outer electrode so that between the electric insulation and the inner wall of the outer electrode an air space is formed along the length of the detector, and the electric insulator through the layer the active element is in point contact with the inner wall of the outer electrode according to Patent No. 13Θ26Θ, characterized in that the electric insulator (2) is an ethane weave of fibers, preferably glass or asbestos. The subject matter in ^ r ^^^ azku There is a fire detector of a fire warning system, used especially in installations of aircraft propulsion units and in storage rooms and other places protected against fire, an improvement of patent No. 138 268. Known from the main patent description No. 138 268 lęnrown, the fire detector of the anti-pressure system, consists of an external electrode in the form of a protective tube, inside which an internal electrode in the form of a wire is placed in the vicinity of an active element, which is an eutectic salt, and an electrical insulator in the form of short sections of the ceramic tube, the inner electrode with the electrical insulator is embedded inside the outer electrode, so that between the inner wall of the outer electrode, a space is formed along the length of the detector, and the electric insulator, through the layer of the active element, touches the inner wall of the outer electrode at points. ^ e ^ J. The disadvantage of such a detector is the small bend radii which damage the ceramic tubing and thus cause false signaling. The detector according to the invention is distinguished by the fact that the electrical insulator is a braid of fibers, preferably glass or asbestos. According to the invention, by using a flaccid insulator, smaller detector bend radii were obtained without damaging the insulator. The subject matter of the invention is illustrated in an exemplary embodiment in the drawing which shows the mA fire detector in longitudinal section. The fire detector consists of an internal electrode 1 placed in a fiber splitter 2. The electrode 1 together with the insulating glass fibers 2 is covered with a thin layer of the active element, which is a eutectic salt, and is embedded inside the outer electrode 3 so that a cavity is formed between the electrode 1 and the inner wall of the electrode 3. air space along the length of the detector, and the flexible insulator 2 is in point contact with the inner wall of the outer electrode 3. The detector works as follows. The external electrode 1 and the external electrode 3 are electrically connected to the pommer-signaling block impedance and / not shown in the drawing / of the protected object. Under normal operating conditions of the facility. If the object temperature does not exceed the assumed melting point value of the eutactic salt, then the section of the circuit between electrode 1 and electrode 3 has a high impedance. 158 337 Poster object causes the temperature of the outer electrode 3 1 when the temperature exceeds a ^p nienla salt eutelctycznej ^t o is ³³ 8 ° C NAAT ^EP kissing a ^p pressure layers ^y active element in the form of a salt eutaktycznaj, which increases its electrical conductivity resulting in stable electrical connection between the active electrode and external electrode 3 As a result of a rapid change in the impedance of the eutectic salt, the section of the circuit in which the temperature increase occurs, the measuring and signaling block signals the occurrence of a fire