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Wind pipe smoke-sensing fire detector

A smoke-sensing fire and detector technology, applied in fire alarms, instruments, alarms, etc., can solve the problems that the detector is difficult to adapt to a wide range of wind speed changes, restricts the wide-scale application of fire detectors, and false alarms, etc. Guaranteed hydrodynamic properties, enhanced detection capability and sensitivity, and reduced hysteresis

Active Publication Date: 2010-06-30
SHENYANG FIRE RES INST OF MEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, due to the different wind speeds in the air ducts of the HVAC system and a wide range of changes, this type of detector is difficult to adapt to a wide range of wind speed changes, and there is a problem of missing alarms.
On the other hand, there are dust, water mist and heated air in the air duct. It is difficult for ordinary point-type smoke detectors to distinguish them from smoke particles, so there are false alarms. These two problems restrict this type of fire detection. wide range of applications

Method used

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  • Wind pipe smoke-sensing fire detector
  • Wind pipe smoke-sensing fire detector
  • Wind pipe smoke-sensing fire detector

Examples

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Embodiment Construction

[0030] The detailed structure of an air duct smoke detector of the present invention will be described in conjunction with an embodiment.

[0031] The detector as figure 1 As shown, it includes the shell, the airflow sampling pipe 1, the airflow exhaust pipe 2, the smoke optical detection chamber 3, and the infrared photoelectric detection circuit such as Figure 5 As shown, the low-impedance signal sampling and amplifying circuit is shown as Figure 6 As shown, the signal processing circuit as Figure 7 As shown, the delay fault signal output circuit is as Figure 9 Shown, signal output and display circuit as Figure 10 shown and the power conversion circuit as Figure 8 shown.

[0032] The connection of the detector is: the left and right sides of the casing are divided into an airtight airflow detection chamber 3 and a control circuit chamber 5, the airflow sampling pipe 1 and the airflow exhaust pipe 2 extend into the pipeline requiring airflow sampling and are fixed ...

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Abstract

The invention relates to a wind pipe smoke-sensing fire detector, belonging to the technical field of fire detection. The detector structurally comprises a shell, an airflow sampling pipe, a an airflow discharging pipe, a smoke optical detecting room, an infrared photoelectricity detecting circuit, a low-resistance signal sampling amplifying circuit, a signal processing circuit, a time delay trouble signal output circuit, a signal output and display circuit and an electric source conversation circuit. The detector can improve the distinguishing and identifying capability of interference signals, thereby correspondingly reducing the false alarm rate and avoiding the alarm failure of fire information, guaranteeing the flowability of the airflow in an airflow detecting cavity and reducing the influence of a circulation region, and leading the flow field near the smoke optical detecting room to be uniform.

Description

technical field [0001] The invention belongs to the technical field of fire detection, in particular to an air duct smoke detector. Background technique [0002] The air ducts in the building's HVAC system form a complex piping system, which is mainly used to transport and distribute air efficiently according to the flow rate, and is the most important part of the HVAC system engineering in the building. However, when a fire occurs, smoke, toxic gas and flames may spread along the air duct, causing a larger fire. The air duct fire detection can be installed inside the main air supply duct to detect the failure of the air conditioning system itself. For example, the fan is overheated; it can also be installed in the return air duct of the room to detect whether there is a fire in the room; it can also be installed near various air valves in the air duct system to control the action of the air valve and prevent fire from spreading through the air duct system. In addition, it ...

Claims

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Application Information

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IPC IPC(8): G08B17/107
Inventor 董文辉张曦梅志斌
Owner SHENYANG FIRE RES INST OF MEM
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