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Detection of blockages and interruptions with an aspirating smoke detector (ASD)

A signal device and smoke technology, which is applied to fire alarms, instruments, and alarms that rely on smoke/gas effects, and can solve problems such as complex determination of correction values ​​and slow correction intervention

Active Publication Date: 2013-03-13
SIEMENS SWITZERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the method described in EP 1 638 062 A1 mentioned at the outset is complicated with regard to the determination of the correction value which should represent a change in the behavior of the system consisting of suction duct and fan, said change being based on Changes in the density of the air and / or at least one environmental parameter that causes a change in the density of the air
[0014] A further disadvantage lies in the slowness of the corrective intervention, that is to say in the correction of the air volume flow measured value or the air mass flow value output by the air flow sensor or in the upper limit sum for an interrupted or blocked air volume flow or air mass flow. Correction of the lower limit

Method used

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  • Detection of blockages and interruptions with an aspirating smoke detector (ASD)
  • Detection of blockages and interruptions with an aspirating smoke detector (ASD)
  • Detection of blockages and interruptions with an aspirating smoke detector (ASD)

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Embodiment Construction

[0045] FIG. 1 shows an exemplary flow chart for explaining the method according to the invention for detecting blockages and interruptions in the ductwork of smoke detectors, wherein air is sucked in from the spaces and installations to be monitored via the ductwork by means of ventilators. . The space to be monitored can be EDV space or server space. The device may be an electrical or electronic device, such as a switchgear or container.

[0046] In step S2, for detecting the air flow, the air volume flow of at least a portion of the sucked-in air is measured, for example . This part of the air drawn in may for example be only 2% of the total air flow to be monitored.

[0047] In step S3, the air temperature T, preferably of the air taken in, is measured.

[0048] In step S4, according to the invention, the rotational speed n of the fan is increased (regulated) as the air temperature T increases and is decreased (regulated) as the air temperature T decreases.

[0049] I...

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Abstract

The invention relates to a method and a corresponding aspirating smoke detector (ASD) for detecting blockages and interruptions in a pipe system (1). Air is aspirated, by a ventilator (3) and via the pipe system (1), from rooms and devices that are to be monitored, and monitoring takes place for any characteristics of burning. The air flow (V, m) of at least one part of the aspirated air is measured, as is the air temperature (T). A blockage signal (V) is emitted if the air flow (V, m) falls below a predetermined lower limit value (V-, m-) and / or an interruption signal (U) is emitted if the air flow (V, m) rises above a predetermined upper limit value (V+, m+). According to the invention, the rotational speed (n) of the ventilator (3) is increased as air temperature (T) rises and reduced as air temperature lowers.

Description

technical field [0001] The invention relates to a method for identifying blockages and interruptions in ductwork for inhalation smoke detectors. Such an inhalation smoke detector is also known in the technical language as ASD (stands for Aspired Smoke Detector). In this case, air is sucked in by means of a ventilator via ductwork from the spaces and installations to be monitored and monitored as a function of fire characteristic variables. Furthermore, the air flow of at least a portion of the air drawn in and the air temperature are measured. If the air flow falls below a predetermined lower limit value, a blockage message is output. If the air flow exceeds a predetermined upper limit value, an abort message is output. [0002] The invention also relates to an inhalation smoke detector having at least one detector for fire characteristic variables with an evaluation unit for outputting a warning or fire message and with a sensor for supplying air to the detector. Ventilat...

Claims

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Application Information

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IPC IPC(8): G08B17/10
CPCG05B15/02G08B29/043G08B17/10
Inventor M.T.科勒M.菲舍尔M.勒普费
Owner SIEMENS SWITZERLAND