An active air intake type bus flammable gas detection device and working method

Abstract

The invention discloses an active air intake type bus flammable gas detection device and a working method. The axial flow fan is arranged at the air inflow port of the intake pipe, the gas detection sensor is arranged at the air outflow port of the acceleration pipe, and the detection circuit is arranged at the air inlet port of the acceleration pipe. On the circuit board: the air intake pipe is divided into three cavity areas with different pipe diameters, the cavity area includes an air intake pipe, a throat diameter, and an acceleration pipe, and the inlet of the air intake pipe is connected with the air outlet of the axial flow fan. The design of the invention is simple and reasonable. The air in the compartment is sent into the intake pipe through the axial flow fan. Gas turbulent flow, the airflow in radial movement rotates at the same time, and is sent to the detection room of the gas sensor, which can achieve the effect of speeding up the detection of flammable gases, prevent passengers from carrying flammable and volatile items on the bus, and protect passengers and buses Safety.

Description

technical field [0001] The invention belongs to the technical field of flammable gas detection, in particular to an active air intake type bus flammable gas detection device and a working method. Background technique [0002] Buses, as a means of daily commuting for the public, belong to areas with a high concentration of people. If an arson case occurs, it will usually cause serious losses and social impact. Common preventive measures are to actively monitor suspicious personnel or suspicious liquid combustibles by the driver, or install a combustible detection system to prevent (such as patent CN107452203A). When the driver actively detects suspicious objects, due to the driver They do not have the power to enforce the law, and often encounter situations where passengers do not cooperate or refuse to cooperate with the inspection. When the flammables detection system is used for prevention, due to the narrow space, airtightness and poor air flow of the bus, the existing f...

AI Technical Summary

Problems solved by technology

When the flammables detection system is used for prevention, due to the narrow space, airtightness and poor air flow of the bus, the existing flammables monitoring device for public transport vehicles, the receiving sensor is installed inside the receiving module due to its small size , only when the concentration of combustibles in the air reaches a certain value, the gas molecules enter the interior of the gas sensor to form an electrochemical reaction, and the resistance value of the sensor changes significantly before it can be detected, which seriously affects the detection effect of the system , in order to make up for this deficiency, it is often necessary to install a sending end (CN304191086S). The sending end uses a cross-flow fan, and the sending end is fixed on the floor in the compartment. When the sending end fan is working, it forms a In the air supply area, the air flow is accelerated, which is convenient for the gas to enter the sensor of the receiving module. When there are many people on the bus, when the aisle is blocked, the air supply area will be blocked, so that the effect of the transmitter Inconspicuous or deactivated, seriously affecting the detection effect or making the system useless

At the same time, due to the height difference between the sending end and the receiving end, its working principle is as follows figure 2 As shown, the two are not on the same receiving level. The transmitting end is fixed on the floor of the compartment, while the receiving end is installed under the passenger seat in the compartment, 40 to 50 cm above the ground. When the transmitting end is working, its air supply The area is limited, and the sending end and the fan will have large noise, poor reliability, limited air supply angle, large air outlet grille at the sending end, easy to be stuck by foreign objects, and short life when the fan is working.

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