Safety apparatus for portable gas range and method for operating the same

In a safety apparatus for a portable gas range including a burner with an igniter;

• a gas inlet for connecting a canister;
• a regulator having a main gas discharging pipe for discharging a gas supplied from the gas inlet to the burner;
• an air mixing pipe disposed between the burner and the main gas discharging pipe of the regulator;
• a housing vertically formed on a lower portion of the regulator and having an internal path communicated with a through hole connected to a lower portion of the gas flow path in the regulator;
• a safety rod resiliently installed in the internal paths by a resilient spring S1, in which when an internal pressure of the canister is increased to a danger pressure range P1 no more than an explosion critical pressure, an end portion of the safety rod is protruded outwardly through a hole formed at a lower portion of the housing by the gas pressure P1;
• and a device having a releasing lever pivoted around the safety rod to detach the canister, a method for operating the safety apparatus, wherein
• a) when the internal pressure of the canister reaches a range of gas pressure, pO, which is above a highest level of a normal gas pressure and below a lowest level of a danger pressure, and which is higher than a charge pressure of the canister and lower than a gas pressure P1 lower than an explosion critical pressure, a safety operating member resiliently installed between the through hole and an upper portion of the safety rod by a resilient spring S0 is moved down by the gas pressure P0, such that the through hole is opened to communicate with the internal path;
• b) a gas discharging path formed on one side wall of the housing with the safety operating member installed thereto and opened/closed by the safety operating member is opened according to descent of the safety operating member;
• c) when the gas of gas pressure P0 supplied to the internal path through the gas flow path and the through hole is discharged through the gas discharging path, the gas is supplied to the burner by an auxiliary gas discharging pipe displaced between the gas discharging path and the air mixing pipe for combustion thereof, so that the internal pressure of the canister is maintained at a low pressure state;
• and
• d) when the internal pressure of the canister is rapidly increased to the gas pressure P1 higher than the gas pressure P0 discharged through the auxiliary gas discharging pipe due to continuous radiant heat, the safety operating member is moved down by the gas pressure P1, and the safety rod resiliently installed to a bottom of the safety operating member by a spring S1 is moved down, such that a distal end portion of the safety rod is protruded outwardly through the hole formed at the lower portion of the housing to automatically detach the canister from the gas inlet by operating the releasing lever and thus to interrupt gas supply.