Vehicle liquefied natural gas cylinders and the heavy truck

Abstract

The invention provides a liquefied natural gas cylinder for vehicle and a heavy-duty truck using the liquefied natural gas cylinder for vehicle. A cryopump is connected to a hydraulic control system, a split type inside sleeve comprises a flange, a thin walled tube and a pedestal, and a thermal insulation layer is provided on the outer wall of the thin walled tube as well as between the flange and the pedestal; an overlay welding is carried out for an outside sleeve and the inside sleeve after positioning through a corresponding through hole and a corresponding tapped hole, grooves are respectively formed at bottom parts of the inside sleeve and the outside sleeve, an inverted V-shaped part is combined after connection, and a welding is carried out; a valve seat in a front end supporting device is provided with multifunctional holes, a liquid inlet tube, a liquid outlet tube, a blow-down tube, a liquidometer tube or a safety valve tube are installed in the holes, an over-filling preventing head and an over-filling preventing cylindrical shell are equipped, and the bottom of the over-filling preventing head is provided with a small hole; a rear end supporting device is provided with a small hole on a supporting head, so that the internal space of the supporting head is communicated with the space of the cylinder; a rear end supporting shaft sleeve is made of epoxy glass fiber reinforced plastic; front and back heads of an inner container are provided with molecular sieves; a head of a housing is provided with palladium oxide. The cryopump can be stably installed on the liquefied natural gas cylinder, and heat leakage is effectively reduced.

Description

technical field [0001] The invention relates to a gas cylinder, in particular to a liquefied natural gas cylinder for vehicles, which is especially suitable for the equipment and use of natural gas heavy trucks. Background technique [0002] Natural gas has very good economy, environmental protection and safety. Today, when the world's energy is becoming increasingly tense and air pollution is extremely serious, it will be the future development trend to vigorously promote natural gas clean energy, reduce oil consumption, and reduce pollution emissions in the field of transportation, especially heavy trucks. "New energy industry development" It will be one of China's development priorities during the "Twelfth Five-Year Plan" period. The HC of natural gas heavy trucks has been reduced by 71%, the CO content has been reduced by nearly 90%, the NOX content has been reduced by 35.6%, and the solid particle content has been reduced by almost 100%. [0003] With the adjustment o...

AI Technical Summary

Problems solved by technology

There are many deficiencies in the LNG cylinders for vehicles with self-pressurization structure: the gas supply of the self-pressurization system is unstable. The self-pressurization equipment has the risk of failure; the self-pressurization system is affected by the ambient temperature. When the filling pressure of the filling station is too low, the LNG cylinder with the self-pressurization equipment needs to wait for 15 to 30 hours after filling. Boosting in minutes; self-boosting equipment is inconvenient to operate, and the driver needs to operate it himself; the control of the self-boosting system cannot be automated, and the performance indicators required for the engine depend on the driver’s experience and operation; self-boosting equipment has potential safety hazards. Gas cylinders become the weakest link in the entire gas supply system after the addition of pressurized equipment, and affect other performances such as thermal insulation of gas cylinders

The existing gas cylinders all use the pressure inside the cylinder to make the liquefied natural gas flow out of the cylinder for use by the engine. However, in plateau areas, the external pressure itself is small, which makes the existing gas cylinders unable to discharge liquid, so that they cannot be used normally.

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