Device for real-time detection of pipeline gas leakage and leakage prevention, and use method

A device for real-time detection of pipeline gas leakage and leakage prevention, comprising a gas pipeline, wherein a gas detector is arranged at an outer part of the gas pipeline, a telescopic cylinder is also electrically connected to an outer side of the gas detector, a plurality of three-way elliptical pipes are mounted at a middle segment part of the gas pipeline, flange connectors being abutted with the gas pipeline are fixedly arranged at two ends of each three-way elliptical pipe, a limiting cylinder is fixedly mounted at a bottom port of each three-way elliptical pipe, a separating mechanism is arranged between each limiting cylinder and each three-way elliptical pipe, and a pneumatic mechanism is arranged at a bottom of the limiting cylinder and is capable of triggering each separating mechanism to separate and seal each three-way elliptical pipe when being driven by the telescopic cylinder;

• wherein the pneumatic mechanism comprises a sleeve cover threadedly sleeving to a bottom of each limiting cylinder, a gas pipe fixedly communicates to a bottom of each sleeve cover, one end away from each sleeve cover of the gas pipe jointly and fixedly communicates with an output end of a communicator, a gas delivery pipe is fixedly mounted at an input end of the communicator, and a gas cylinder communicates with one end away from the communicator of the gas delivery pipe;
• a piston block is embedded in the gas cylinder in a sliding manner, a first spring is arranged at one end close to the gas delivery pipe of the piston block, a push rod which penetrates through the gas cylinder in a sliding manner is fixedly mounted at one end away from the first spring, of the piston block, an another end of the push rod is fixedly connected with an output end of the telescopic cylinder, a first one-way gas valve of which a flowing direction is from an outer part of the gas cylinder to an inner part of the gas cylinder is arranged at one end close to the gas delivery pipe of the gas cylinder through a connecting pipe, and a second one-way gas valve of which a flowing direction is from the gas delivery pipe to the communicator is arranged on the gas delivery pipe;
• wherein each separating mechanism comprises an airbag fixedly mounted at a center of each three-way elliptical pipe through bolts, a connecting pipe fixedly communicates with an opening in a bottom of each airbag, each airbag is capable of being inflated to expand and tightly fill a middle of its respective three-way elliptical pipe, an abutting cylinder is fixedly mounted on an inner wall of each limiting cylinder, and a top of each abutting cylinder fixedly communicates with a bottom of each connecting pipe;
• wherein a protection mechanism is arranged at a bottom of each abutting cylinder, and comprises a cover plate fixedly mounted at a bottom of each abutting cylinder through screws, an extending cylinder which is embedded with an inner cylinder of each abutting cylinder in a sliding manner is fixedly mounted at an upper part of each cover plate, an inverted-conical bevel opening is formed between each extending cylinder and each cover plate, a plurality of through holes which are equidistantly distributed in a circumference are formed in a top of each extending cylinder, a positioning shaft is fixedly mounted at one end close to each inverted-conical bevel opening at a top of each extending cylinder, an elliptical sealing member sleeves an outer side of each positioning shaft, a sliding groove is formed in the elliptical sealing member, and a limiting disc which is embedded with each sliding groove in a sliding manner is fixedly mounted at a bottom of each positioning shaft;
• a second spring is arranged between an upper part of each elliptical sealing member and each extending cylinder, each elliptical sealing member is squeezed by each second spring, and an outer diameter of each elliptical sealing member is greater than a bottom diameter of each inverted-conical bevel opening, so that each elliptical sealing member realizes one-way sealing of a lower port of each inverted-conical bevel opening from top to bottom;
• and a prodding assembly is arranged at a bottom of each cover plate and is capable of clearing a lower port of each inverted-conical bevel opening from top to bottom by lifting each elliptical sealing member, and a communicating assembly which is capable of adjusting internal airtightness of each limiting cylinder is arranged between each prodding assembly and each limiting cylinder;
• wherein each prodding assembly comprises a damping rotating shaft fixedly embedded in each limiting cylinder, each damping rotating shaft is distributed below each cover plate, a rotating shaft part is arranged in each damping rotating shaft, a cam fixedly sleeves an outer surface of each rotating shaft part and is located directly below each elliptical sealing member, a knob is fixedly mounted at one end of each rotating shaft part, and another end of each rotating shaft part is rotatably embedded in each limiting cylinder;
• wherein each communicating assembly comprises a blocking rotary table fixedly mounted at one end away from each knob of each rotating shaft part, each blocking rotary table is rotatably embedded in each limiting cylinder, a first air hole is formed in each limiting cylinder, a second air hole is formed in each blocking rotary table, wherein when each rotating shaft part drives each cam to rotate until a protruding part of each cam points directly upwards, each first air hole and each second air hole are abutted, and an internal space and an external space of each limiting cylinder are in communication.