초록 ▼

According to a gas table 1, combustion gas (including the flame) is jetted from a flame port 17 of a burner 14 diagonally upward entirely twisted in the burner circumferential direction. The combustion gas flows into plural combustion gas routes sectioned into spiral shape, and hits trivet claws 22,

According to a gas table 1, combustion gas (including the flame) is jetted from a flame port 17 of a burner 14 diagonally upward entirely twisted in the burner circumferential direction. The combustion gas flows into plural combustion gas routes sectioned into spiral shape, and hits trivet claws 22, and goes through. That is, the combustion gas is guided in spiral shape by the trivet claws 22, and exhausted along a cooking container P bottom surface toward the outer circumferential direction. As a result, in the combustion gas route, the combustion gas is always subject to direction changing force and the flow thereof is disturbed, and accordingly, a heat transmission border film is unlikely to be formed on the cooking container P bottom surface, and the heat of the combustion gas is transmitted to the bottom surface of the cooking container P preferably.

대표청구항 ▼

What is claimed is: 1. A cooking stove comprising: a burner that heats a cooking container from below; and a ring plate being a trivet ring arranged around the burner, said trivet ring having a front plate and an opposed back plate spaced from said front plate, wherein respective edges of said plat

What is claimed is: 1. A cooking stove comprising: a burner that heats a cooking container from below; and a ring plate being a trivet ring arranged around the burner, said trivet ring having a front plate and an opposed back plate spaced from said front plate, wherein respective edges of said plates are joined to one another to form a space for reducing heat transfer from said front plate to said back plate; wherein the respective edges of said front plate and said back plate are sealed to one another to form a vacuum heat insulation space, a plurality of trivet claws arranged on an upper surface of the trivet ring, each of the trivet claws being formed in a spiral shape extending from an inner circumferential end thereof to an outer circumferential end thereof when viewed from above and being formed of an arcuate plate-like wall arranged on the upper surface of the trivet ring from the inner circumferential end to the outer circumferential end; and a current plate arranged on the trivet ring, the current plate circumscribing the trivet claws such that each of the trivet claws is arranged on an inner circumferential surface of the current plate, and such that each of the trivet claws extends higher above the trivet ring than the entirety of the current plate, wherein a ring shaped combustion gas route is formed between the upper surface of the ring plate and a bottom surface of the cooking container, wherein an exhaust guide is arranged in the combustion gas route that makes the combustion gas of the burner flow along the bottom surface of the cooking container in a spiral circulation shape toward the outer circumferential direction, wherein an upper surface of each trivet claw is for supporting the bottom surface of the cooking container as well as for functioning as the exhaust guide, and wherein when the cooking container is placed thereon, the upper surface of each trivet claw spirally contacts with the bottom surface of the cooking container, and the ring shaped combustion gas route is sectionally formed in a spiral gas route surrounded by the upper surface of the trivet ring, the trivet claws, the current plate, and the bottom surface of the cooking container. 2. A cooking stove according to claim 1, wherein the trivet claws are formed integrally with the trivet ring. 3. A cooking stove according to claim 2, wherein the upper surface of each trivet claw at the inner circumferential end of the trivet claw is formed lower than the upper surface of the trivet claw at the outer circumferential end of the trivet claw. 4. A cooking stove according to claim 1, wherein the upper surface of each trivet claw at the inner circumferential end of the trivet claw is formed lower than the upper surface of the trivet claw at the outer circumferential end of the trivet claw. 5. A cooking stove according to claim 1, wherein a cross sectional area of the ring shaped combustion gas route becomes smaller as the distance of the ring plate from the center becomes farther, or, the cross sectional area is same even when the distance becomes farther. 6. A cooking stove according to claim 1, wherein the burner is an external flame port burner where many flame ports are arranged in the outer circumferential direction, and a direction of a flame jetted from the flame ports is inclined by a specified angle in the burner circumferential direction to the straight line extending in a radial direction from the center of the burner. 7. A cooking stove according to claim 1, wherein each of the trivet claws is thicker in an axial direction, extending along a vertical axis of the cooking stove, from the upper surface of the ring plate near the inner circumferential end than at the outer circumferential end. 8. A cooking stove according to claim 1, wherein the burner is an all primary air-type burner.