High-precision gas filling device and filling method

Abstract

The invention discloses a high-precision gas filling device which is simple in structure, skillful in design and reasonable in layout and magnifies the differential pressure through reducing the sizeof a gas storing cavity to further realize precise control of the gas aeration quantity. In addition, the invention further discloses a precise filling method by utilizing the high-precision gas filling device. Through matching of the high-precision gas filling device and the precise filling method, gas adding can realize precise weighing; moreover, compared with the traditional gas filling manner, precise filling can be realized on the premise of reducing the filling times to improve the filling quality and efficiency; the traditional filling method is used for the normal temperature liquescent gas, as the pressure is likely to have irregular sudden drawdown, the gas filling manner taking pressure as the reference cannot be realized due to losing of the reference standard, manual gas filling according to experience is likely to cause excessive gas filling, and the defective percentage is higher; and the high-precision gas filling device can realize precise filling for the normal temperature liquescent gas, can realize any combination according to the variety of the raw material gas, is excellent in universality and can effectively control the manufacturing cost.

Description

technical field [0001] The invention relates to the field of gas filling, in particular to a high-precision gas filling device and a gas filling method using the device. Background technique [0002] With the increasing demand of the domestic standard gas market, the quality requirements of standard gas are becoming increasingly stringent. Customers generally require that the deviation between the actual value and the theoretical value be within 5%, or even within 2%. This brings certain challenges to the preparation of standard gases, making human errors in the production process unnegligible, reducing work efficiency and increasing the rate of defective products. [0003] At present, the existing gas distribution technology and devices mainly rely on pressure gauges as a reference, and use the mass of gas added to determine the value. However, in actual situations, the relationship between gas pressure and mass is affected by too many factors, such as temperature (expansi...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing gas distribution technology and devices mainly rely on pressure gauges as a reference, and use the mass of gas added to determine the value. However, in actual situations, the relationship between gas pressure and mass is affected by too many factors, such as temperature (expansion, liquefaction) , air pressure, gas properties, etc., often lead to excessive addition of gas to exceed the concentration required by the customer, and the weighing of gas cannot be accurately weighed like solids, so it is difficult to accurately fill

At the same time, once it is overfilled, the excess gas has been mixed evenly with the gas in the finished gas cylinder and cannot be taken out, resulting in a certain deviation in the products that leave the factory.

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