RU2263970C1 - Smoke fire detector case - Google Patents

Abstract

FIELD: fire alarms, particularly devices adapted to control fire alarm performance.

SUBSTANCE: case has lid provided with extension used as button and having figured cut. The extension is connected to cylindrical pin arranged from inner lid side and passing into smoke chamber as a result of pressing the extension so that infrared radiation emitted by light-emitting diode falls on photodiode. Detector workability is indexed by light-emitting diode.

EFFECT: simplified signal passage control.

3 dwg

Description

The invention relates to the field of fire alarm, and in particular relates to devices intended for use in smoke detectors for monitoring the health of detectors, including in the case of contamination.

There are two basic principles of building devices for monitoring the health of smoke detectors. The first principle is based on the introduction of a body into the smoke chamber, which, like smoke, scatters and reflects radiation from the LED and transfers it to the photodetector (Security Systems magazine, December 2003 - January 2004, No. 6/54, p. 50-51; RF patent No. 2182366, publication date 2002.05.10 "Ionized Fire Detector"). This principle allows you to check the entire signal path, but for this, in previous designs, additional details were used in the form of buttons, springs, rockers, etc.

The second principle is based on the removal of an electric button on the sensor surface, with which you can force a signal into the circuitry and thus monitor the operation of the device using light or sound indicators (Security Systems magazine December 2003 - January 2004, No. 6/54, p. 50-51). This principle simplifies the health check of a fire detector, but does not allow you to check the health of light emitters and photodetectors, including due to their contamination.

The closest in technical essence to the proposed device is a smoke optical-electronic fire detector, consisting of a cover and a base and using a mechanical button with a rocker to test the functionality of all the functional components of the fire detector (Optical smoke electronic smoke detector IP 212-49. Passport SVTI. 425231.004 Substation, manufacturer of the Krasnoye Znamya plant, Ryazan).

The technical result of the invention is a combination of ease of assembly with the completeness of monitoring the health of the above principles, i.e. control over the passage of the signal without additional details in the form of buttons, springs, rockers, etc., as well as the ability to check the operability of light emitters and photodetectors due to their contamination.

The specified technical result is ensured by the fact that a curly slot, a protrusion on the outside and a cylindrical one are additionally introduced into the housing cover of the smoke detector containing a smoke chamber, an LED, a photodiode, a printed circuit board with an electronic circuit, through windows, an insect screen and latches a pin falling into the smoke chamber when a protrusion is pressed. In this case, the operability of the sensor is indicated by an LED.

The essence of the device is illustrated using the drawings (figure 1, figure 2, figure 3). The cover 1 has a figured slot 2. In the center on the outside of the cover there is a protrusion 3 that acts as a button. A cylindrical pin 4 is made on the inside of the cover. When a tab is pressed, a part of the cover is recessed into the detector. The pin enters the smoke chamber 5, where, due to re-reflection, infrared radiation from the LED 9 is incident on the photodiode 10. The detector’s operability is induced by the LED 6. When the protrusion is released, due to the elasticity of the plastic, the movable part of the lid changes to its original position. The cover design allows the use of an insect screen 7, latches 8.

To control the operability, a sample smoke detector was created. Its further production can be carried out using standard equipment, modern materials and technology in industrial production.

Claims (1)

A smoke detector housing comprising a smoke chamber, an LED, a photodiode, a printed circuit board with an electronic circuit, through windows, an insect screen and latches, characterized in that the lid has a figured slot, in the center on the outside of the lid there is a protrusion that acts as a button, which in turn is connected to a cylindrical pin made on the inside of the lid and falling into the smoke chamber when a protrusion is pressed, where, due to re-reflection, infrared radiation from the LED is incident on the photodiode, while The detector's operability is indicated by an LED.

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