Quick coupling for fluid loading and unloading

Abstract

The invention provides a quick coupling for fluid loading and unloading. The quick coupling comprises a valve, a fixed inner ring, a guide inner ring, an outer ring, a nut flange and a hand wheel, wherein the valve is arranged in the guide inner ring, the guide inner ring is connected with the fixed inner ring, and the outer ring and the hand wheel are respectively connected with the nut flange; the rear end of the valve is of a screw structure, and thread is arranged in the nut flange and matched with a thread on the screw structure; guide holes are formed in the edge of the end surface of the fixed inner ring, or guide holes are correspondingly formed in the edge of the end surface of the fixed inner ring and the edge of the end surface of the guide inner ring; an interlocking limiting guide rod is arranged in each guide hole; a guide centre is fixed to the rear end of each interlocking limiting guide rod, a spiral groove is formed in the outer surface of the outer ring, and the guide centres are located in the spiral groove; the thread of the spiral groove is opposite to the thread of the screw structure in rotating direction; a sliding-moving device is fixed to the valve and can drive the valve to slide in the guide inner ring along the axis. and a limiting structure is arranged on the fixed inner ring. The quick coupling has the advantages that a tank car does not need tobe transformed, and operation is easy.

Description

technical field [0001] The invention relates to a connection joint for fluid delivery, in particular to a quick joint for fluid loading and unloading. Background technique [0002] With the accelerated consumption of natural gas, liquefied petroleum gas and other gaseous fuels and liquid chemical raw materials, the transportation volume has increased sharply, and the environmental protection situation has become increasingly severe. At present, the main modes of inland transportation of gaseous fuels and chemical raw materials are pipeline transportation and tank car filling transportation. The process of tank car filling and transportation involves loading and unloading of materials. The traditional loading and unloading process mostly uses a ball valve with a quick joint to connect, and the standard male joint on the tank is connected by pulling the fastener at the butt end, and then the ball valve is opened for filling. [0003] Since the conventional quick connector doe...

AI Technical Summary

Problems solved by technology

The design pressure of this type of single-valve dry joint is not more than 2.5MPa, and some are only 1MPa. Therefore, when the delivery pressure of some liquids (such as liquefied hydrocarbons) is required to be greater than 2.5MPa, normal delivery cannot be achieved.

When the medium pressure exceeds 2MPa, when the single valve joint is manually docked or opened, the operating force will increase significantly, or even fail to operate.

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