Internal and external gas filtering devices and gas detecting device

Abstract

The invention provides internal and external gas filtering devices and a gas detecting device; the internal gas filtering device comprises a double layer of cylinders, a cylinder cover, and exhaust holes and filter paper arranged on the cylinder cover; ventilating holes are densely distributed on the inner and outer layers of cylinder walls of the double layer of cylinders, respectively; the filter paper is arranged between the inner and outer layers of cylinder walls; the external gas filtering device comprises an outer cylinder and an internal gas filtering device; a double layer of cylinders is sleeved in the outer cylinder, the cylinder opening of the outer cylinder is hermetically connected with the edge of the cylinder cover, and an air inlet hole is arranged on the bottom part of the outer cylinder; the gas detecting device comprises a gas detector, and a detecting chamber, an air extracting pump, a check valve, a gas drying device and a gas filtering device, which are communicated in sequence; the gas detector is installed in the detecting chamber, the gas drying device is an internal gas drying device or an external gas drying device. The gas filtering device has the advantages of simple structure, good filtering effect, convenience for use and strong practicability, and the gas detecting device has the advantages of accurate detection result and long service life.

Description

technical field [0001] The invention relates to a gas detection device, in particular to an internal and external gas filter device and a gas detection device. Background technique [0002] After the urban domestic sewage enters the septic tank, under natural conditions, it flows into the urban sewage pipeline after anaerobic fermentation, decomposition and settlement by bacteria, and finally flows into the sewage treatment plant for treatment; in the process of septic tank, it will A large amount of harmful gas is produced, the main component of which is combustible gas methane, and a small amount of hydrogen sulfide, ammonia, etc. The total gas composition is relatively complex; when the combustible gas accumulates more and more and reaches the lower limit of explosion, when it encounters an open flame or the temperature in the pool When it is too high, it will cause an explosion; at present, there have been many public reports of septic tank explosions and injuries. [0...

AI Technical Summary

Problems solved by technology

[0005] The air in the septic tank or the underground pipe network is generally humid and dirty, and there are some viscous tiny particles mixed in it. The detection instrument uses a pump to pump out the gas in the septic tank or the underground pipe network. The surface of the sensor of the instrument is tested. After a certain period of time, the surface of the metallurgical powder mesh on the surface of the sensor will be stuck with sticky matter, resulting in a serious deterioration of its air permeability, or even airtightness. Only a small part or If the penetration cannot penetrate, the detection result of the detector cannot correctly reflect the combustible gas content in the septic tank or in the pipeline, and the gas detector cannot play a practical role

[0006] In order to solve the above problems, the gas detectors of many manufacturers have added filter devices, that is, when the gas is pumped up by a pump, it is filtered first, and then the gas is sent to the detector for detection; but because the filter device is relatively simple, It is not enough to solve the above problems, so that the metallurgical powder net will still be blocked after the product has been working for a period of time, which greatly increases the maintenance cost and frequency of the product, and also has a negative impact on the users of gas detectors

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