Standard alcohol gas generating device

Abstract

The invention provides a standard alcohol gas generating device. According to the invention, a sampling channel (A), a dilution channel (B) and a gas mixing part (C) are arranged in a container (10);the sampling channel (A) and the dilution channel (B) switch a circulation mode and an air-blowing mode respectively through a first two-position three-way solenoid valve (A5) and a second two-position three-way solenoid valve (B3), so continuous air blowing operation in the prior art can be avoided; and in a circulation mode, alcohol gas volatilized by an alcohol gas generator (A3) is circulatedand repeatedly enter the alcohol gas generator (A3) for bubbling, so the concentration stability of generated alcohol gas is improved, and no exhaust gas is produced.

Description

technical field [0001] The invention relates to the technical field of exhaled gas alcohol content detector (abbreviated as alcohol detector) verification, in particular to a standard alcohol gas generating device that uses liquid pure alcohol to generate standard alcohol gas. Background technique [0002] The alcohol detector is a tool used by the traffic police for law enforcement. It belongs to a kind of measuring instrument. Only the alcohol detector that has been verified by the metrology department and obtained the verification certificate is legal. How to check the alcohol detector? First you need to have standard alcohol gas. At present, the standard alcohol gas used for verification is divided into two types: dry gas and wet gas. The so-called wet gas is the standard alcohol gas produced by the wet alcohol simulator; the so-called dry gas is the standard alcohol gas contained in the steel cylinder prepared by the weighing method. Since this type of alcohol gas has...

AI Technical Summary

Problems solved by technology

However, continuous operation is not the best way to work, it will generate a lot of exhaust gas

Generally, it only takes 3 to 10 seconds to blow air for each alcohol detector test, and the number of alcohol detectors to be tested in a day is also limited. Therefore, the standard alcohol gas generated by the device in most of the time is finally discharged as exhaust gas. It causes waste and pollutes the environment

[0005] 2. The standard alcohol gas produced by the device is easily affected by the environment

In this case, when nitrogen continuously enters the generator 2, the temperature control accuracy of the liquid alcohol in the generator 2 cannot be very high, and the temperature control accuracy of the gaseous alcohol above will be worse, and the generator 2 produces The stability and uncertainty of the concentration of the standard alcohol gas have a great relationship with the temperature stability and accuracy of the liquid alcohol and gaseous alcohol in the generator 2. Therefore, if the ambient temperature changes, the standard alcohol produced by the device will The accuracy of the gas concentration will be affected

For the dilution gas B, after it enters the mixer 6, due to the slow heat exchange of the gas and the large flow rate of the dilution gas B, it is too late for heat exchange. When the temperature changes, it is always kept at 34°C ± 0.5°C as required by the verification

[0006] 3. Poor stability of alcohol gas concentration produced by single bubbling

Nitrogen A entering generator 2 during bubbling stays in the liquid alcohol for a very short time, and the gas exchange time is short to achieve complete equilibrium. Therefore, the stability of the concentration of alcohol gas produced by a single bubbling like this device poor

[0007] Therefore, it is necessary to design a new standard alcohol gas generating device to solve the problem that the device can only work continuously, be easily affected by the environment, and have poor stability of alcohol gas concentration

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