A precise metering device for liquefied natural gas filling

Abstract

The invention discloses a precise metering device for filling liquefied natural gas. The precise metering device comprises a liquid inlet, a temperature sensor, a pressure sensor, a single chip microcomputer, a flowmeter, a first electromagnetic valve, a second electromagnetic valve, a gas filling gun and a liquid return opening, wherein the liquid inlet is connected with the gas filling gun through a gas filling pipeline; a circulating pipeline is arranged between the liquid return opening and the gas filling pipeline; the second electromagnetic valve is arranged on the circulating pipeline; the temperature sensor and the pressure sensor which are respectively connected with the single chip microcomputer are arranged on the gas filling pipeline; the temperature sensor and the pressure sensor are positioned between a connecting point of the circulating pipeline and the liquid inlet; the flowmeter and the first electromagnetic valve are positioned on the gas filling pipeline between the connecting point of the circulating pipeline and the gas filling gun; both the first electromagnetic valve and the second electromagnetic valve are connected with the single chip microcomputer. According to the precise metering device for filling the liquefied natural gas, high-precision metering is realized by simultaneous monitoring of the temperature sensor and the pressure sensor; the liquefied natural gas is pre-cooled by arranging the circulating pipeline; automatic control is realized by connecting signals and controlling the electromagnetic valves through the single chip microcomputer.

Description

technical field [0001] The invention belongs to the field of liquefied natural gas metering, and in particular relates to an accurate metering device for gas filling of liquefied natural gas. Background technique [0002] Liquefied natural gas (LNG) has been widely used in the automotive industry due to its abundant reserves, low price, clean and environmentally friendly, and long battery life. In recent years, my country's LNG industry has developed rapidly, and the country's LNG filling stations have increased on a large scale every year. However, China's corresponding LNG technology development and standard specifications are relatively lagging behind, and management experience is not yet rich, which leads to the unsatisfactory domestic LNG filling machine and liquid filling gun related technologies. [0003] Natural gas is a colorless and odorless combustible gas produced in oil and gas fields. Its main component is methane (CH 4 ), accounting for about 80-99%. Under...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the current LNG filling machine, such as inaccurate measurement and short service life, the present invention aims to provide a high-precision LNG filling metering device, which is easy to operate and easy to maintain.

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