Boss structure sealing experiment device and system for IV type hydrogen storage cylinder, and test method

A boss structure sealing experiment device for an IV type hydrogen storage cylinder, comprising a high-pressure chamber, a sealing leakage structure, a cylinder mouth valve, and a low-pressure chamber, the high-pressure chamber being tightly connected to the sealing leakage structure through a bolt, the sealing leakage structure being tightly connected to the low-pressure chamber through a bolt, upper and lower end portions of the sealing leakage structure being provided with sealing rings, the sealing rings being compressed under an action of fastening of the bolts, the cylinder mouth valve being arranged in the sealing leakage structure, and in seal connection to an inner wall of the sealing leakage structure, and the cylinder mouth valve being internally provided with an internal thread,

• wherein a cavity of the high-pressure chamber is internally provided with a raised threaded column, the threaded column being provided with an external thread matching the internal thread, the threaded column being in threaded connection to the cylinder mouth valve, to provide a pre-tightening sealing force for a leakage contact surface of the sealing leakage structure, the high-pressure chamber is further provided with two high-pressure gas inlets and outlets, to pressurize and depressurize high-pressure gas, and a flange of the high-pressure chamber being provided with first bolt holes distributed in a circumferential direction, to be tightly connected to the sealing leakage structure,
• wherein the sealing leakage structure comprises a plastic lining and a boss structure, the plastic lining being assembled to the boss structure in a matching manner through a trapezoidal groove.