RU194940U1 - Fire detector with threshold indicator - Google Patents

Abstract

The utility model relates to the field of fire alarm and can be used in fire alarm systems to detect fire in the early stages of a fire in the premises, by detecting changes in the optical density and temperature of the analyzed air and objects in the room. A fire detector with a threshold indication device contains a plastic housing, base, printed circuit board, light emitter, the optical axis of which is located at an angle to the optical axis of the light detector, forming a mode ul, the second forming module, the measuring volume formed by the surface of the printed circuit board and an optical camera mounted on it, a test hole, a test button, a heat information transducer and a smoke information transducer that translate information from the heat-sensitive element and the light receiver into digital values to output it to display unit. At the same time, the real and maximum permissible values of the temperature and smoke parameters in the room are indicated on the display unit, upon reaching which the display unit informs about the potential danger and the need to check the protected room. Technical result - operational control of the values of smoke and air temperature in the protected room, informing about potential danger and the need to check the protected room before the threshold value, as well as prevention ozniknoveniya dangerous situation.

Description

The utility model relates to the field of fire alarm and can be used in fire alarm systems to detect fire in the early stages of a fire in rooms by detecting changes in the optical density and temperature of the analyzed air and objects in the room.

A device is known from the prior art (RF Patent No. 2221278 “Smoke Detection Device”, G08B 17/10 - published on 01/10/2004) containing a clock generator, a radiator coupled through an optical camera with light-absorbing walls to a photodetector, a reset circuit, a circuit comparisons and memorization, shaper smoke detection signal. Moreover, it additionally has a synchronous detection circuit, and the comparison and memory circuit is made in the form of the first and second binary counters, with the V input and R input of the first binary counter of the comparison and memory circuit connected to the corresponding outputs of the clock generator, the output of the aforementioned first binary counter connected in parallel with the input of the emitter, the V-input of the second binary counter of the comparison and memory circuit and the first input of the synchronous detection circuit, the second and third inputs of which are connected respectively GOVERNMENTAL the outputs of the photodetector and the reset circuit, and output - with R-input of the second binary counter comparison and storage circuit, the output of the second comparison circuit a binary counter and memory associated with the C-inputs of both counters and to the input of the signal shaper registration smoke.

The smoke detector has the disadvantage of:

- low sensitivity, since the synchronous detector does not provide stable detection of the amplified signal due to the phase delays of the amplifier.

A device is known (RF Patent No. 2258259 "Smoke detector", G08B 17/10 - published on 08/10/2005), comprising, inside the housing mounted on the base, an optical module detachable from the housing, consisting of a light emitter, a light detector, a measuring chamber, made in the form limited by the side labyrinth plates and the bases of the cylindrical volume and with the possibility of smoke flowing into it from the outside. Moreover, mounting places with diaphragms for the light emitter and the light receiver in the measuring chamber with the alignment of their optical axes, formed by a horizontally detachable light-tight barrier, are made with the possibility of placing the centers of the diaphragms, focuses of the light emitter and the light receiver in a circle plane with a radius proportional to the distance from the intersection of the optical axes light emitter and light detector to the focus of the light emitter to the wavelength of the light emitter in the range of at least 1.28 1,2105 no more than 2 , 60⋅105, and the center defined by the point of intersection of the optical axes of the light emitter and the light detector, intersecting at an angle of not less than 130 ° and not more than 140 °, in the projection sector of which a two-sided labyrinth plate is installed between the bases of the measuring chamber, intersecting with its faces, a plane passing through a straight line connecting the most distant from each other points of the diaphragms of the mounting positions of the light emitter and the light detector, and excluding direct hit of light radiation the teacher to the light receiver, while the stands of T-shaped sections of the side labyrinth plates made with bevels of not more than 45 ° and directed inside the measuring chamber are radial to the circle passing through the centers of the lenses of the light emitter and the light receiver centered at the intersection of their optical axes and bounding on the inner surfaces of the bases of the measuring chamber, the surfaces are corrugated, and the T-shaped crossbars in the section of the side labyrinth plates face one side with sharp edges at the corners of the bases the measuring chamber and the other are located in the immediate vicinity of the corresponding dihedral angle of the other T-shaped section of the side labyrinth plate, forming smoke passages between the pairs of side labyrinth plates, one of the arched side labyrinth plates made with a rough surface on the inside installed perpendicularly the optical axis of the light detector in the angular sector of at least 30 ° and not more than 60 ° from the optical axis of the light emitter, and the other is installed in the projection onto the bases of the smaller angle of intersection of the optical axes of the light emitter and light receiver sector no more than 60 ° from the optical axis of the light detector.

This device has several disadvantages:

- low sensitivity in the early stages of smoke;

- high consumption of electric current from the fire alarm loop;

- there is no possibility to track changes in smoke concentration in real time.

The problem to which the claimed utility model is directed is the possibility of rapid detection of smoke and heat in the early stages of a fire, directly near the smoke center, with the ability to monitor the optical density characterizing the smoke and air temperature of the protected room.

This task is achieved due to the fact that the fire detector with a threshold value indicating device comprises a plastic case, a base, a printed circuit board, a light emitter, the optical axis of which is located at an angle to the optical axis of the light detector, forming a module, a second forming module, and a measuring volume formed by the printed surface the board and an optical camera installed on it, a test hole, a test button, a heat information converter and a smoke information converter, which The information is transferred from the temperature-sensitive element and the light receiver to digital values for output to the display unit, while the display unit indicates the real and maximum permissible values of the temperature and smoke parameters in the room, upon reaching which the display unit informs of the potential danger and the need to check the protected room. The optical camera can be made in the form of forming modules by a printed circuit board with smoke sampling windows, the smoke sampling windows being connected to the measuring volume by labyrinth channels formed by radial bridges between the cylindrical shells, which exclude direct light from outside entering the measuring volume.

The technical result provided by the given set of features is the implementation of operational control of the values of smoke and air temperature in the protected room, informing about the potential danger and the need to check the protected room, before the threshold value, and also preventing the occurrence of a dangerous situation.

The other known technical solutions for a similar purpose with a similar set of essential features when conducting a search in the scientific and technical literature and patent documentation were not found by the applicant. Therefore, the applicant believes that the inventive fire detector with a device for indicating threshold values meets the criterion of "novelty." A fire detector with a threshold indication device can be manufactured using well-known equipment and used in fire alarm systems to detect fire in the early stages of a room fire. Therefore, it meets the criterion of "industrial applicability".

The essence of the utility model is illustrated in FIG. 1, which shows a general view of a fire detector with a threshold indication device.

The fire detector with a threshold indication device consists of a plastic housing 1, a base 2, a printed circuit board 3, an optical camera 4, a light emitter 5, a forming module 6, a light detector 7, a second forming module 8, a measuring volume 9, a test hole 10, a smoke information converter 11, a heat information converter 12, a heat-sensitive element 13, an indication unit 14, a test button 15.

A fire detector with a threshold indication device operates as follows: through the perforation of the plastic case 1 and the smoke intake windows of the optical camera 4, made in the form of a removable cover, air enters the measuring volume 9, formed by the surface of the printed circuit board 3 and a removable cover of the optical camera 4 The electric potential of the thermosensitive element 13 changes when its temperature changes, it is processed by the elements of the electronic circuit of the printed circuit board 3 with the subsequent formation signals “Standby mode” or “Fire” and translates it into digital values using the converter 12, after which the processed data is sent to the display unit 14. In this case, the pulse sequences of the electrical signals generated by the electronic circuit on the board 3 are converted by the light emitter 5 into light pulses and emitted into the measuring volume 9. The scattered radiation is received by the light detector 7, which is optically inaccessible to the direct radiation of the light emitter 5, the optical axis of which is located at an angle to the optical th axis light detector 7. Received reflected radiation scattered light detector 7 is converted into electrical signals which are processed by the electronic circuit elements of the circuit board 3, with the subsequent formation of the signal "Standby" or "fire". The converted electrical signals are fed to the display unit 14, which indicates the real and maximum permissible values of the smoke index and temperature. Upon reaching the maximum permissible values, an indication of a potential danger and the need to check the protected room before the threshold value is reached to the display unit 14, preventing a dangerous situation from occurring.

Thus, the use of a fire detector with a threshold indication device will allow you to quickly monitor the parameters of optical density and air temperature in the room, as well as to warn about a fire in the early stages of its development.

Claims (2)

1. A fire detector with a threshold indication device, characterized in that it comprises a plastic housing, a base, a printed circuit board, a light emitter, the optical axis of which is located at an angle to the optical axis of the light detector, forming a module, a second forming module, a measuring volume formed by the surface of the printed circuit board and an optical camera installed on it, a test hole, a test button, a heat information converter and a smoke information converter that translate information mation with the temperature sensing element and the light detector into digital values to output it to the display unit, wherein the display unit indicates the actual value and the maximum allowable temperature parameters and smoke in the room, when the indication unit which informs about the potential dangers and the need to check the protective room. 2. A fire detector with a threshold indication device according to claim 1, characterized in that the optical camera is made in the form of forming modules by a printed circuit board with smoke sampling windows, the smoke sampling windows being connected to the measuring volume by labyrinth channels formed by radial bridges between the cylindrical shells, eliminating direct external light entering the measuring volume.

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