GB2106236A - Gas burners - Google Patents

Abstract

The invention relates to gas burners of the type comprising a plurality of chambers A, B, C, each independently fed with gas from a common supply. In a simplified construction the gas burner comprising three separate chambers, A, B, C, of which two A and B are enclosed within the third C. <IMAGE>

Description

SPECIFICATION Gas burners The invention relates to gas burners of the type comprising a plurality of separate chambers each independently fed with gas from a common supply, and particularly but not exclusively to so-called Triplex burners.

According to the invention there is provided a gas burner comprising at least three separate chambers, each independently fed with gas from a common supply and wherein two of the said chambers are enclosed within a or the third of the chambers.

Preferably of the two chambers enclosed within the third chamber, one is enclosed within the other. At least one of the chambers enclosed within another may be fed with gas by means passing through an or the enclosing chamber.

The gas feeding means may comprise a pipe passing through an opening in a chamber wall, the edge of said opening being sealed to one end of a sleeve which fits closely about the said pipe.

Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings of which: Fig. 1 is a side elevation, Fig. 2 is a plan of one embodiment of the invention; and Fig. 3 is a side elevation and Fig. 4 a plan of a further embodiment of the invention.

As shown in Figs. 1 and 2, the gas burner comprises a tube 1 of rectangular cross-section arranged horizontally and with one narrow wall 2 uppermost. The tube 10 also comprises bottom wall 9 and side walls 10, 1 liThe wall 2 is provided with a series of holes 3 which, though shown only at one end for the sake of clarity in fact extend substantially from end to end of the tube. The ends of the tube are closed apart from, at end 4 a single circular hole 5 and, at end 6, holes 7, 8.

Within the tube 1 vertical wall 12 and inclined wall 13 extend from one side wall to the other, and define, with a portion of each of the side walls 10, 11 and the perforated upper edge 2, a gastight chamber A. The chamber A is fed with gas by means of a pipe 14 which enters the tube 1 by the orifice 5 and enters the chamber A through an opening 15 in the wall 12. Above the chamber A is a radient or ceramic element 1 6a which becomes incandescent when heated by the burning of gas passing from the chamber A through those of the gas ports 3 in the portion of the edge 2 defining the top of the chamber.

Vertical walls 17 and 18 and horizontal wall 19 extend from one side wall to the other and together with the side walls 10, 11 and a part of the top edge 2 define a further chamber B within the tube 1 and totally enclosing the chamber A.

Chamber B is supplied with gas by means of a pipe 20 which enters the tube 1 through opening 7 in the end wall 6 and enters the chamber by opening 21 in wall 18. Gas passes out of the chamber B through the gas ports 3 in those portions of the edge 2 lying between walls 17 and 1 8 at each side of the chamber A, that is to say between walls 1 7 and 12 and between wall 1 8 and the uppermost end of wall 13. The gas outlet ports of chamber B are thus arranged in two distinct sets and above these are arranged radiants 1 6b, one at each side of radiant 1 6a.

Gas is introduced into the interior of the tube 1 by means of a pipe 22 which enters through opening 8 in end wall 6. The lower wall 19 of chamber B is spaced from the lower wall 9 of the tube 1 and gas can therefore pass from one end of tube 1 to the other and flow out through the ports 3 in those portions of the edge 2 lying between wall 17 and end 4 and between wall 18 and end 6.

The tube 1 can thus be regarded as a chamber C enclosing chamber B and having two sets of exist ports lying respectively under each of two radiants 1 6c.

In this embodiment, the tube 14 by which gas is fed into the chamber A has to pass through the vertical transverse wall 1 7 defining an end to the chamber B, the wall 17 being provided with an opening 24 for this purpose. Whilst the tube 14 may be welded at the opening 1 5 where it enters into the chamber A and again where it passes through opening 5 in wall 4 of tube 1 so that gastight seals are provided, it is preferable that it should not also have to be welded where it passes through the wall 1 7. In order to create a sufficiently gas tight seal at the passage through wall 17 so as to avoid leakage of gas between chambers B and C, one end of a sleeve 23 is sealed, by welding, to the opening 24, and the inner diameter of the sleeve 23 is such that it is a close fit on the outer diameter of the tube 14.

Thus, the pipe 14 may slide through the opening 24, for example during construction or to accommodate movement caused in use by thermal expansion, the tightness of the fit between the sleeve 23 and the tube 14 combined with the length of the sleeve 23 providing a satisfactory seal at gas pressures employed in practice.

The pipes 14,20 and 22 are coupled to a gas supply through a valve (not shown) which provides that at low gas supply rates the gas is fed to the burner solely through pipe 14 so that the three chambers, only chamber A is supplied with gas. When the gas issuing from the ports 3 is ignited, only radiant 1 6a is heated to luminocity.

The valve is arranged so that, when the gas supply to the burner is increased, some is directed through pipe 20 so as to enter chamber B and is emitted from the gas ports below radiants 1 6b.

Only when the gas supply is turned full on is any gas introduced into the chamber C through pipe 22 so that radiants 1 Sc as well as 1 6b and 1 spa are illuminated. Whilst the above arrangement is expected to be the normal, it will be understood that the chambers A, B and C may be fed with gas in a different sequence if required.

In the embodiment shown in Figs. 3 and 4, the construction of the chambers A, B and C is similar to that described in connection with the Fig. 1 embodiment, but with the exception that pipe 14 is replaced by a pipe 25 which enters chamber A through an opening 26 in one of the side walls 10 or 11. Accordingly, the walls 12, 1 7 and 4 are not provided with openings 1 5, 24 and 5 respectively, nor is there any sleeve 23.

CLAIMS (filed on 15th Sept., 82) 1. A gas burner comprising at least three separate chambers, each independently fed with gas from a common supply and wherein two of the said chambers are enclosed within a or the third of the chambers.

2. A gas burner according to Claim 1 wherein, of the two chambers enclosed within the third chamber, one is enclosed within the other.

3. A gas burner according to Claim 1 or Claim 2 wherein at least one of the chambers enclosed within another is fed with gas by means passing through an or the enclosing chamber.

4. A gas bumer according to Claim 3 wherein the gas feeding means comprises a pipe passing through an opening in a chamber wall, the edge of said opening being sealed to one end of a sleeve which fits closely about the said pipe.

5. A gas burner comprising at least three separate chambers, substantially as described with reference to the drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. embodiment, but with the exception that pipe 14 is replaced by a pipe 25 which enters chamber A through an opening 26 in one of the side walls 10 or 11. Accordingly, the walls 12, 1 7 and 4 are not provided with openings 1 5, 24 and 5 respectively, nor is there any sleeve 23. CLAIMS (filed on 15th Sept., 82)

1. A gas burner comprising at least three separate chambers, each independently fed with gas from a common supply and wherein two of the said chambers are enclosed within a or the third of the chambers.

2. A gas burner according to Claim 1 wherein, of the two chambers enclosed within the third chamber, one is enclosed within the other.

3. A gas burner according to Claim 1 or Claim 2 wherein at least one of the chambers enclosed within another is fed with gas by means passing through an or the enclosing chamber.

4. A gas bumer according to Claim 3 wherein the gas feeding means comprises a pipe passing through an opening in a chamber wall, the edge of said opening being sealed to one end of a sleeve which fits closely about the said pipe.

5. A gas burner comprising at least three separate chambers, substantially as described with reference to the drawings.