Burners

Claim 2

A burner for fluid fuel comprising: a body defining a bore open at both ends, said bore having, sequentially in the direction from one of said open ends to the other of said open ends, a first frusto-conical portion of increasing cross sectional area in said direction, a cylindrical portion and a second frusto-conical portion of decreasing cross sectional area in said direction, said body further defining an annular chamber surrounding said bore; inlet means to said chamber, and outlet means from said chamber surrounding said bore and opening into said bore in the region of the junction of said cylindrical portion with said first frusto-conical portion and arranged to discharge fuel along the surface of said first frusto-conical portion to its open end; means for supplying fluid fuel to said inlet means to said chamber; and air guide means in said bore comprising a body having a cylindrical mid-portion and tapering end portions extending co-axially of said bore with a tapering portion being in said first and second frusto-conical portions and said cylindrical mid-portion being in said cylindrical portion of said bore; wherein, in operation, fluid fuel and air mixture is burnt adjacent said one end of said bore, air being drawn into said bore from said other end, and drawing fluid fuel from said chamber through the opening of said outlet means.

Claim 3

A burner according to claim 1, wherein the body comprises first and second parts between which the annular chamber and outlet means are defined, the outlet means having the form of an opening extending continuously circumferentially of the bore and the parts being relatively movable to vary the dimensions of the outlet opening.

Claim 4

A burner according to claim 2, including means for relatively biassing the parts in a direction to reduce the dimensions of the outlet opening, the body parts being arranged so that the pressure of fluid fuel in the chamber will bias the parts relative to each other in the opposite direction.

Claim 5

A burner according to claim 3, wherein the biassing means includes a piston and cylinder assembly connected between the first and second parts.

Claim 6

A burner according to claim 3, wherein the biassing means includes a spring acting between the first and second parts.

Claim 7

A burner assembly comprising a burner according to claim 1 and a hollow annular member for water, surrounding the burner adjacent the one end and having an inlet and outlet means for directing water against a flame established adjacent the one end of the body.

Claim 8

A burner assembly according to claim 6, wherein the outlet means of the hollow annular member have the form of a plurality of circumferentially spaced outlet nozzles arranged to direct a jet or spray of water against the flame.

Claim 9

A burner assembly according to claim 6, including means in the path of air flowing between the burner and the hollow annular member for providing the air with a non-axial component of velocity.

Claim 10

A burner assembly according to claim 8, wherein the hollow annular member is mounted on a sleeve and the means in the path of air flowing between the burner and the hollow annular member are vanes extending between the sleeve and the burner.

Claim 11

A burner according to claim 1, wherein the air guide means include angularly spaced vanes extending between said air guide means and the wall of said bore.

Claim 12

A burner according to claim 1, wherein the bore at the one end thereof is cylindrical and members are provided at each end of said body having frusto-conical bores therethrough communicating with said bore in said body, the diameters of the bores of said members increasing in directions away from said body.

Claim 13

A burner according to claim 11, wherein said member at said other end of said body is formed with openings therein for admission of additional air to the burner.

Claim 14

A burner assembly comprising a burner according to claim 12 and a hollow annular member for water, surrounding the burner adjacent the one end and having an inlet and outlet means for directing water against a flame established adjacent the one end of the body.

Claim 15

A burner assembly according to claim 13, wherein the outlet means of the hollow annular member have the form of a plurality of circumferentially spaced outlet nozzles arranged to direct a jet or spray of water against the flame.

Claim 16

A burner assembly according to claim 13, including means in the path of air flowing between the burner and the hollow annular member for providing the air with a non-axial component of velocity.

Claim 17

A burner assembly according to claim 15, wherein the hollow annular member is mounted on a sleeve and the means in the path of air flowing between the burner and the hollow annular member are vanes extending between the sleeve and the burner.

Claim 18

A burner for fluid fuel comprising: a body having a bore open at both ends through which air flows and adjacent one of which fluid fuel will be burnt, said body comprising a first part in part defining said bore and a second part which in part defines said bore and is axially slidable relative to said first part of said body, said body further including a chamber for fluid fuel defined between said first and second parts, said chamber having an inlet for fluid fuel and an outlet opening into said bore between said first and second parts, and a radial wall provided by a radially outwardly extending surface on said second part such that the pressure of fluid in said chamber will exert on said radial wall a force urging the second part of said body relative to the first part of said body in a direction to increase the axial extent of said outlet opening; biasing means for moving said second part in a direction to decrease said axial extent of said outlet opening; and air guide means in said bore; said bore immediately upstream relative to the direction of air flowing therethrough of said outlet opening being cylindrical and immediately downstream of said outlet opening being gradually reduced in diameter, and said air guide means comprising a body co-axial with said bore and extending into said cylindrical and reduced portions of said bore, said body of the air guide means having a tapering portion extending into said gradually reduced portion of said bore.

Claim 19

A burner for fluid fuel comprising: a body having a bore open at both ends through which air flows and adjacent one of which fluid fuel will be burnt, said body comprising a first part in part defining said bore and a second part which in part defines said bore and is axially slidable relative to said first part of said body, said body further including a chamber for fluid fuel defined between said first and second parts, said chamber having an inlet for fluid fuel and an outlet opening into said bore between said first and second parts, and a radial wall provided by a radially outwardly extending surface on said second part such that the pressure of fluid in said chamber will exert on said radial wall a force urging the second part of said body relative to the first part of said body in a direction to increase the axial extent of said outlet opening; biasing means for moving said second part in a direction to decrease said axial extent of said outlet opening; and air guide means in said bore; said bore immediately upstream relative to the direction of air flowing therethrough of said outlet opening being cylindrical and immediately downstream of said outlet opening being gradually reduced in diameter, and said air guide means comprising a body co-axial with said bore and extending into said cylindrical and reduced portions of said bore, said body of the air guide means having a tapering portion extending into said gradually reduced portion of said bore.

Claim 20

A burner according to claim 17, wherein the biassing means is a spring.

Claim 21

A burner according to claim 17, wherein the biassing means is a piston and cylinder assembly.

Claim 22

A burner according to claim 17, wherein the outlet opening extends continuously circumferentially around the bore.

Claim 23

A burner according to claim 17, wherein members are provided at each end of the bore having frusto-conical bores therethrough communicating with the bore, each frusto-conical bore having a diameter which increases in a direction away from the bore of the body.