High-pressure gas filling/unloading system

A high-pressure gas filling and unloading system, comprising:

• a high-pressure gas pipeline for connecting to a gas filling station;
• a displacement gas pipeline for gas displacement;
• a plurality of double-channel rotating joints provided in said high-pressure gas pipeline and configured to be rotatable under pressure;
• and
• a filling and unloading joint provided at a free end of said high-pressure gas pipeline and comprising a control mechanism, said filling and unloading joint being configured to form a displacement working channel or a filling and unloading working channel therein through the control mechanism,
• wherein the control mechanism is configured to alternately open the displacement working channel and the filling and unloading working channel, so that the displacement working channel is in communication with the displacement gas pipeline for gas displacement, or the filling and unloading working channel is in communication with the high-pressure gas pipeline for filling and unloading of high-pressure gas,
• wherein the filling and unloading joint further comprises a male end unit for connection with a high-pressure gas transportation vehicle or a gas-fueled device, and a female end unit for fixed connection with the high-pressure gas pipeline, the control mechanism being arranged on the female end unit,
• wherein the female end unit comprises a female housing, a valve core assembly within the female housing, and a bypass displacement pipeline formed within the female housing, and
• wherein an inner cavity of the female end unit is configured to be in communication with the bypass displacement pipeline to form a female displacement flow path, and the valve core assembly is configured to move, driven by the control mechanism, axially relative to the female housing, thereby closing the female displacement flow path and forming a female filling and unloading flow path within the female end unit.