Airtight chamber and method for balancing air pressure inside airtight chamber

Abstract

The invention discloses an airtight chamber and a method for balancing air pressure inside the airtight chamber.An air collecting bag a is arranged outside an airtight chamber box body, an air inlet-outlet of the air collecting bag a is connected with a port a of a three-way pneumatic rotary valve a, a port b of the three-way pneumatic rotary valve a is directly led to the inside of the airtight chamber box body, and an air outlet c of the three-way pneumatic rotary valve a is connected with a vacuum pump.A air collecting bag b is arranged on a ceiling inside the airtight chamber box body, an air inlet-outlet of the air collecting bag b is connected with a port d of a three-way pneumatic rotary valve b, a port e of the three-way pneumatic rotary valve b is directly led to the atmospheric environment outside the airtight chamber box body, and an air outlet f of the three-way pneumatic rotary valve b is connected with the vacuum pump.The air collecting bags are attached with supports, vacuum pumping is clean and thorough, the requirement is rapidly met, air tightness is good, no leakage or chemical reaction is produced, test data is accurate, and test reproducibility is good.

Description

technical field [0001] The invention relates to an airtight chamber and an air pressure balancing method in the airtight chamber. Background technique [0002] The closed chamber method is a method commonly used in the world for the determination of motorcycle fuel evaporative emissions. During the experiment, the change of ambient temperature in the airtight chamber will cause the pressure in the airtight chamber to fluctuate, and the pressure change in the airtight chamber will affect the fuel evaporation rate, thereby affecting the accuracy and repeatability of the test. Therefore, a flexible expansion container should be installed on the airtight chamber to balance the pressure change caused by the small change in temperature. At the same time, since the main components of fuel oil are hydrocarbons, sulfides, etc., the selected flexible expansion container must not penetrate and volatilize these substances, nor can it react with these substances. [0003] In addition, ...

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Problems solved by technology

[0004] In order to overcome the above problems, the object of the present invention is to provide a gas collection bag, which can effectively solve the problems of incomplete vacuuming, poor sealing performance, and poor corrosion resistance of the gas collection bag in the prior art.

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