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A burner includes a first tube portion formed with an ejection port; a second tube portion that extends in the first tube portion toward the ejection port and to which gaseous mixture flows in from a side opposite to the ejection port; a third tube portion arranged in the first tube portion and incl

A burner includes a first tube portion formed with an ejection port; a second tube portion that extends in the first tube portion toward the ejection port and to which gaseous mixture flows in from a side opposite to the ejection port; a third tube portion arranged in the first tube portion and including an open end positioned on the ejection port side; a closing portion that closes the open end; a coupling wall portion that closes a gap between the first tube portion and the second tube portion; a partition wall that is coupled to the first tube portion and the third tube portion, the partition wall being formed with a communication path; and an igniting portion that is arranged on the ejection port side with respect to the partition wall.

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1. A burner comprising: a first tube portion having a tube end including an ejection port that ejects a combustion gas in which gaseous mixture is combusted;a second tube portion extending in the first tube portion toward the ejection port, the gaseous mixture flowing into the second tube portion fr

1. A burner comprising: a first tube portion having a tube end including an ejection port that ejects a combustion gas in which gaseous mixture is combusted;a second tube portion extending in the first tube portion toward the ejection port, the gaseous mixture flowing into the second tube portion from a side opposite to the ejection port;a third tube portion arranged in the first tube portion, the second tube portion is internally inserted into the third tube portion, the third tube portion including a closed end closed by a closing portion that is positioned on the ejection port side;a first wall that is coupled to an inner side surface of the first tube portion and an outer side surface of the second tube portion to close a gap between the first tube portion and the second tube portion;a second wall coupled to the inner side surface of the first tube portion and an outer side surface of the third tube portion, the second wall having a communication path that communicates a side opposite to the ejection port with respect to the second wall with the ejection port side;an air supplying passage for supplying air; andan igniting portion that is arranged on the ejection port side with respect to the second wall and that ignites the gaseous mixture, wherein:the first tube portion includes an extended part extending toward the side opposite to the ejection port from a coupling portion of the first tube portion with the first wall;the extended part defines a space that is configured to receive fuel and air;and the extended part has first introduction ports that introduce air supplied through the air supplying passage into the extended part and swirling flow generating portions that generate a swirling flow of the air supplied through the air supplying passage in the extended part;wherein the first tube portion includes: second introduction ports that are positioned in a region of the ejection port side with respect to the igniting portion, wherein the second introduction ports introduce air to a gap between the first tube portion and the third tube portion. 2. The burner according to claim 1, further comprising: a fourth tube portion arranged so that the first tube portion is internally inserted, the fourth tube portion having an end on the ejection port side that closes a gap with the first tube portion and, wherein the air supplying passage that is connected to a region on the ejection port side of the fourth tube portion and that supplies air to a gap between the first tube portion and the fourth tube portion. 3. The burner according to claim 2, further comprising a guiding portion that guides the air so that the air from the air supplying passage swirls around the first tube portion. 4. The burner according to claim 1, wherein, an internal space of the first tube portion is partitioned to a premixing chamber and a combustion chamber by the third tube portion, the closing portion, and the second wall, and the closing portion includes a circulating flow generating portion having:a surface that collides with a flow of the combustion gas from the igniting portion side toward the ejection port to generate a circulating flow in a part of the flow; anda region configured to be exposed to a pre-mixed gaseous mixture in the premixing chamber. 5. The burner according to claim 4, wherein: the closing portion includes a closing plate that closes the open end of the third tube portion; the circulating flow generating portion includes a baffle plate arranged on the ejection port side with respect to the closing plate, the combustion gas from the igniting portion side toward the ejection port colliding the baffle plate; and a first circulating flow generating space is arranged between the baffle plate and the closing plate in the combustion chamber to generate a circulating flow on an upstream side of the baffle plate, and a second circulating flow generating space is arranged on a downstream side of the baffle plate in the combustion chamber. 6. The burner according to claim 4, wherein the circulating flow generating portion includes a heat transmitting portion having an elongated shape inserted in the premixing chamber. 7. The burner according to claim 4, wherein the circulating flow generating portion includes a baffle plate that closes the open end of the third tube portion, the baffle plate having a portion that projects out from an outer side surface of the third tube portion. 8. The burner according to claim 5, wherein a narrow portion is arranged between the baffle plate and the first tube portion. 9. The burner according to claim 8, wherein an outer diameter of the baffle plate has a ratio of greater than or equal to 0.6 and smaller than or equal to 0.8 with respect to an inner diameter of the first tube portion. 10. The burner according to claim 4, wherein the swirling flow generating portions swirl the air in a direction different from a circulating direction of the combustion gas by the circulating flow generating portion. 11. The burner according to claim 7, wherein a narrow portion is arranged between the baffle plate and the first tube portion. 12. The burner according to claim 11, wherein an outer diameter of the baffle plate has a ratio of greater than or equal to 0.6 and smaller than or equal to 0.8 with respect to an inner diameter of the first tube portion.