Gas leakage alarming system for LNG (Liquefied Natural Gas) heavy truck

Abstract

The invention provides a gas leakage alarming system for an LNG (Liquefied Natural Gas) heavy truck. The system comprises a frame assembly which is internally provided with a gas bottle and a valve and a pipeline attached to the gas bottle, a gas leakage sensor, an alarm, a fixed cover and a guide cover, wherein one end of the guide cover is a large opening while the other end is a small opening, the gas leakage sensor is installed in the fixed cover and is electrically connected with the alarm, the small opening of the guide cover is communicated with the fixed cover, and the large opening of the guide cover covers at least part of a joint between the valve and the pipeline but does not seal the frame assembly. The system provided by the invention has accuracy and safety of gas leakage detection of the heavy truck into consideration.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a gas leakage alarm system for LNG heavy trucks. Background technique [0002] In recent years, liquefied natural gas (LNG) and compressed natural gas have been widely used as clean energy in industry and commerce, urban residents and the automobile industry. The gas leakage alarm system is an important system to ensure production and personal safety. It has been widely used in oil refineries, oil depots, liquefied gas stations, gas stations, gas stations, painting rooms, home production rooms and other places that emit flammable gases and vapors. In order to detect the content of combustible gas in time, find the leakage as soon as possible, and eliminate the danger. The principle of the gas leakage alarm system is that when the concentration of combustible gas reaches the set alarm value, the combustible gas alarm will send out an alarm signal to remind to take safety measures as so...

AI Technical Summary

Problems solved by technology

[0006] Because the environment of gas leakage sensors 2, 4, and 10 is not a stable sealed environment or due to improper installation of the combustible gas alarm system, the height of the position is affected by the density of the gas, resulting in insufficient detection accuracy of the combustible gas alarm system

In fact, the frame assembly 3 cannot be designed to be closed for the sake of driving safety, because in case the valve 18 and the pipeline 19 behind the gas bottle 21 leak, the leaked gas should be volatilized into the air as soon as possible to reduce the concentration and prevent explosion. , which also forms a pair of contradictions with the detection of gas leakage

On LNG heavy trucks, the use of gas leakage alarm technology still has the following problems: First, false alarms. When combustible gas alarms are used in open spaces, in order to increase the safety factor, the detection concentration of leaked gas is far higher than the alarm standard. The value is low, so drivers have to suffer from false alarms; the second is missing alarms. Because the installation space is relatively open, it is affected by external factors, such as when the vehicle is driving in the downwind condition where the wind speed is higher than the vehicle speed, or in crosswind conditions. In the case of driving, although the sensor retreats a certain distance in the direction of travel, it is difficult to find the leakage. Even if the actual leakage far exceeds the alarm value, the leakage value detected by the sensor is small, which may easily cause no alarm; Thirdly, due to the large number of valves, the large number of pipe joints and the dispersal, the sensors in the gas leakage alarm system need to be installed in multiple places, and there is a problem of high cost

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