Liquid fuel combustion burner

Claim 2

A fuel spraying method in a liquid fuel combustion burner, which comprises turning a liquid fuel in a flow passage having a sectional area restricted for constringing a flow of the liquid fuel, introducing atomization-­promoting fluid to said flow passage and spraying a mixed fluid of the liquid fuel and the atomization-promoting fluid from said flow passage.

Claim 3

A liquid fuel combustion burner, which is attached to the top end portion of a tube projected into the interior of a combustion apparatus proper and has a structure in which a liquid fuel supplied through a fuel passage formed in the interior of the tube is sprayed into the interior of the combustion apparatus proper together with an atomization-promoting fluid supplied through an atomization-promoting fluid passage formed in the interior of tube and mixed with the fuel, said burner comprising a liquid fuel supply passage, a plurality of injection holes, a branch passage branched from the liquid fuel supply passage, an annular passage communicating with the downstream end of the branch passage and located around the downstream end of the atomization-promoting fluid supply passage, a connecting passage connecting the downstream end of the atomization-promoting fluid supply passage to the injection holes, and a burner proper having a connecting passage connecting the downstream end of the liquid fuel supply passage to the annular passage and the side portions of the respective injection holes.

Claim 4

A liquid fuel combustion burner, which is attached to the top end portion of a tube projected into the interior of a combustion apparatus proper and has a structure in which a liquid fuel supplied through a fuel passage formed in the interior of the tube is sprayed into the interior of the combustion apparatus proper together with an atomization-promoting fluid supplied through an atomization-promoting fluid passage formed in the interior of tube and mixed with the fuel, said burner comprising a liquid fuel supply passage, a plurality of injection holes, a branch passage branched from the liquid fuel supply passage, an annular passage communicating with the downstream end of the branch passage and located around the downstream end of the atomization-promoting fluid supply passage, a connecting passage connecting the downstream end of the atomization-promoting fluid supply passage to the injection holes, and a burner proper having a connecting passage connecting the downstream end of the liquid fuel supply passage to the annular passage and the side portions of the respective injection holes.

Claim 5

A liquid fuel combustion burner as set forth in claim 2, wherein a plurality of injection holes are divided into a plurality of groups, each group consisting of two injection holes, and respective groups are arranged at a plurality of positions separately from one another by predetermined angles in the circumferential direction with the central axis of the burner proper being as the center, and two injection holes of each group are arranged so that they are brought close to each other in the circumferential direction with the central axis of the burner proper being as the center.

Claim 6

A liquid fuel combustion burner as set forth in claim 3, wherein the injection holes of each group are arranged continuously to each other so that the central axes of the injection holes form a crossing angle smaller than 20° or they are parallel to one another.

Claim 7

A liquid fuel combustion burner as set forth in claim 2, wherein the burner proper comprises a fuel supply member and a burner tip connected to the top end of the fuel supply member, a liquid fuel supply passage, an atomization-promoting fluid supply passage, a branch passage and a connecting passage connecting the atomization-promoting fluid supply passage to injection holes are formed in the fuel supply member, and a plurality of injection holes, an annular passage and a connecting passage connecting the downstream end of the liquid fuel supply passage to the annular passage and injection holes are formed in the burner tip.

Claim 8

A liquid fuel combustion burner as set forth in claim 5, wherein the fuel supply member is formed of a substantially columnar member having a surface of a circular cone on the top end.

Claim 9

A liquid fuel combustion burner as set forth in claim 5, wherein in the fuel supply member, a liquid fuel supply passage is formed through top end and rear end portions thereof.

Claim 10

A liquid fuel combustion burner as set forth in claim 5, wherein a plurality of branch passages are formed in the fuel supply member so that the branch passages extend obliquely upward from the rear end of the liquid fuel supply passage and open to the top end face of the fuel supply member.

Claim 11

A liquid fuel combustion burner as set forth in claim 5, wherein in the fuel supply member, a plurality of small-diameter holes extending obliquely from positions close to the rear end of the liquid fuel supply passage on the rear end face of the fuel supply member and being pierced to the top end face of the fuel supply member from the direction orthogonal to said to end face are formed.

Claim 12

A liquid fuel combustion burner as set forth in claim 5, wherein an engaging pin is driven into the peripheral part of the top end face of the fuel supply member and the engaging pin is engaged with an engaging hole formed on the rear face of the burner tip to engage the fuel supply member with the burner tip.

Claim 13

A liquid fuel combustion burner as set forth in claim 5, wherein a recess capable of being engaged with the top end portion of the fuel supply member is formed on the rear face of the burner tip and the burner tip is formed to have substantially a shape of a circular cone as a whole.

Claim 14

A liquid fuel combustion burner as set forth in claim 5, wherein a circular recess is formed at a central part of the inner face of the burner tip, an annular passage is formed in the peripheral portion of said inner face, and a plurality of injection holes pierced from the top end face of the burner tip in a direction orthogonal to said top end face and opening to the interior of the engaging portion are formed between said annular passage and said circular recess.

Claim 15

A liquid fuel combustion burner as set forth in claim 5, wherein between an injection hole-opening portion on the inner face of the burner tip and a circular recess formed at a central part of the inner face of the burner tip, a connecting passage connecting the injection hole and the circular recess is formed, and a connecting passage connecting the injection hole to the annular passage is formed between the opening of the injection hole and the annular passage.

Claim 16

A liquid fuel combustion burner as set forth in claim 5, wherein between an injection hole-opening portion on the top end face of the fuel supply member and a circular recess formed at a central part of the top end face of the fuel supply member, a connecting passage connecting the injection hole to the circular recess is formed, and a connecting passage connecting the injection hole to the annular passage is formed between the opening of the injection hole and the annular passage.

Claim 17

A liquid fuel combustion burner as set forth in claim 2, wherein the burner proper comprises a fuel supply member and a burner tip to be engaged with the top end portion of the fuel supply member, in which a liquid fuel supply passage, an atomization-promoting fluid supply passage, a branch passage, a connecting passage connecting the atomization-promoting fluid supply passage and an injection hole, a part of a plurality of injection holes, an annular passage and a connecting passage connecting the downstream end of the liquid fuel supply passage to the annular passage and injection holes are formed in the fuel supply member, and the remainder of a plurality of injection holes are formed in he burner tip.

Claim 18

A fuel liquid combustion burner as set forth in claim 15, wherein a circular recess is formed at a central part of the top end face of the fuel supply member, an annular passage is formed in the peripheral portion of the inner face of the fuel supply member, and a connecting portion of a plurality of injection holes pierced from the top end face of the burner tip in a direction orthogonal to said top end face is formed between the annular passage and the circular recess.

Claim 19

A liquid fuel combustion burner as set forth in claim 15, wherein a connecting passage is formed between the injection hole-connecting portion of the fuel supply member and the circular recess formed at the central part of the fuel supply member to connect the injection opening-connecting portion to the circular recess, and a connecting passage is formed between the injection hole-connecting portion and the annular passage to connect the injection hole-connecting portion to the annular passage.