High-precision variable gas proportion mixing apparatus and gas proportion mixing method

Abstract

The invention discloses a high-precision variable gas proportion mixing apparatus. The apparatus comprises a mixing tank, gas sources corresponding to the kinds of gases, and a control circuit, wherein the pressures of the gas sources are equal, the pressure of each of the gas sources is greater than the pressure of the mixing tank, the gas sources are connected with the mixing tank through pipelines, each of the pipelines is provided with a solenoid valve, each of the pipelines is also provided with a throttling device, the size sequence of the smallest effective section areas of the throttling devices is (partially) consistent with the size sequence of the proportions of the corresponding kinds of gases in a mixed gas, the control circuit comprises an information data input device and a control device having the information data and program processing functions, and the information data input device and the control end of the solenoid valve are respectively communicated with the control device. The apparatus has the advantages of simple structure, easy operation, high gas mixing proportion precision, and improvement of the market competitiveness; and additionally, the apparatus also realizes automatic control and automatic operation, so the work efficiency is improved.

Description

technical field [0001] The invention relates to a gas proportion mixing device, in particular to a high-precision variable gas proportion mixing device and a gas mixing method thereof. Background technique [0002] With the rapid development of food science and technology, due to food safety and hygiene requirements, technicians from all over the world are intensifying research and development of food preservation packaging technology to ensure that food can be kept fresh for as long as possible during circulation and storage. , sanitation, etc. At present, the more popular food fresh-keeping packaging technology is modified atmosphere packaging, which is also called gas displacement packaging, and is called MAP packaging (Modified Atmosphere Packing) internationally. More than 2 kinds of gases are mixed according to the ratio of food characteristics), replace the air in the fresh-keeping box or packaging bag, change the external environment of the food in the box (bag), to ...

AI Technical Summary

Problems solved by technology

In order to maintain high precision, this device needs to use a high-precision gas sensor. This kind of gas sensor is expensive, and the servo flow valve used in this device is also very expensive. Therefore, this kind of closed-loop gas proportional mixing device very high cost

In addition, this closed-loop gas proportional mixing device also has many defects such as complex structure, high maintenance cost, and control accuracy easily interfered by external factors.

Images