GB2145216A - Gas burner - Google Patents

Abstract

A gas burner comprises an elongate hollow body 10 divided into a plurality of chambers A, B, C arranged end-to-end, gas outlet 5, for the chambers, and at least one infeed duct 17, 18 extending longitudinally of the body for feeding gas to the chambers. The duct may have an aperture 59 (Figure 5) supplying an adjacent chamber, and a restriction 70 located downstream of the aperture to encourage same gas to flow through the aperture and the remainder to pass through the restriction itself (and thence to a further chamber). <IMAGE>

Description

SPECIFICATION A gas burner The invention relates to a gas burner and is particularly but not exclusively concerned with a gas burner for location beneath ceramic radiants of a domestic gas fire, According to one aspect of the invention there is provided a gas burner comprising an elongate hollow body divided into a plurality of chambers arranged end-to-end, gas outlet means for the chambers and an infeed duct extending longitudinally of the body for feeding gas to the chambers.

Preferably a plurality of infeed ducts extends longitudinally of the body for feeding gas to selected chambers. In such a case the hollow body is preferably divided into chambers by transverse divider members and at least one of said infeed ducts passes through one or more of said divider members. The said one infeed duct may comprise a first section which feeds gas to a first chamber and a second section passing through one or more divider members to feed gas from the first chamber to one or more further chambers e.g. a second chamber spaced from the first chamber by at least one other chamber. Gas may be fed to respective chambers through radial ports in wall portions of the duct sections.

Alternatively the said one infeed duct may be continuous and may be formed with a first outlet through which gas passes into said first chamber and a second outlet through which gas passes into one or more further chambers e.g. said second chamber. In such a case, the continuous duct may comprise a plurality of tubes placed together in end-to-end alignment. Such tubes may be interconnected frictionally by annular internal connectors.

Where the continuous duct is formed with first, second or more outlets, one of the outlets may comprise an open end of the continuous duct downstream of the remaining outlets. Each of said remaining outlet preferably comprises a radial port in a wall of the duct. In such a case, a constriction may be provided in the duct downstream of each radial port to cause gas to flow outwards through the associated radial port. Each constriction may comprise one of said annular connectors.

Where a duct passes through two or more divider members, the duct may include spacer means thereon which space the divider members to facilitate assembly of the burner.

According to another aspect of the invention there is provided a gas burner having a gas infeed duct through which gas is fed to a chamber of the burner, said duct being formed with a port in a wall thereof and being constricted downstream of the port so that some of the gas travelling through the duct will be diverted through the port into said chamber and the remainder will flow through the constriction.

The remainder of the gas may be fed to one or more further chambers in the burner. In such a case, the duct may be formed with a plurality of further ports associated with respective further constrictions, which further ports feed gas to respective further chambers.

The or each constriction may comprise an annular connector for tubes from which the duct is constructed.

Various gas burners in accordance with the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a sectional elevation of a duplex burner for use with a gas fire having three radiants, Figure 2 is a sectional elevation of a further duplex burner for use with a gas fire having four radiants, Figure 3 is a sectional elevation of a triplex burner for use with a gas fire having five radiants, Figure 4 is a sectional elevation of a further type of triplex burner, and Figure 5 is a cross-section through an infeed duct comprising tubes interconnected by annular internal connectors.

In Figure 1 a burner 10 comprises a trough-like body 11 which locates dividers 12, 13 in swaged locations (not shown) preferably in a manner described in ourcopending patent application No.

8122994. The dividers are in the form of plates which divide the body into chambers A, B and C. Divider plates are also used to form end closures 14, 15 for the body. The body supports a perforated outlet plate 16 along it upper edge preferably in a manner similar to that described in said co-pending application.

A gas infeed duct 17 extends through apertures in end plate 15 and divider 13 to feed gas to central chamber B. The duct 17 is a gas-tightfit in the apertures. A second infeed duct 18 comprises a first tube 19 extending through an aperture in end plate 15 and a second tube 20 extending in a gas-tight manner through apertures in dividers 12, 13. The tube 19 feeds gas to the chamber C and the tube 20 feeds gas from chamber C to chamber A. The gas is fed from a source via a suitable valve (not shown) which enables gas to be directed to one or other of the ducts 17, 18 or both.

In Figure 2, three dividers 21,22,23 similar to those of Figure 1 divide the trough-like body 11 into chambers D, E, F and G. End plates 14, 15 are provided for the trough. A gas infeed duct 24 comprises a first tube 25 extending in a gas tight mannerthrough apertures in the end plate 15 and divider 23 and a second tube 26 extending through an aperture in divider 22. The tube 25 feeds gas to the chamber F and the tube 26 feeds gas from chamber F to chamber E. A second gas infeed duct 27 comprises a first tube 28 passing in a gas tight manner through an aperture in the end plate 15 and a second tube 29 passing in a gas tight manner through apertures in dividers 21,22 and 23. The tube 28 feeds gas to chamber G and the tube 29 feeds gas from chamber G to chamber D.The infeed ducts 24, 27 can be supplied with gas independently or simultaneously so that gas can be fed either to chambers E,F or chambers D,G orto all the chambers simultaneously.

In Figure 3, the trough-like body is divided into five chambers H, J, K, Land M by four dividers 30,32,33, 34 between end plates 14, 15. Three infeed ducts 35, 36 and 37 are provided, the ducts 35 and 36 extending from one end of the burner and the duct 37 extending from the opposite end. Ducts 35 and 36 are of the dual-tube type as 18 and 27 above and feed gas to chambers, Land H, M respectively.

Duct 37 comprises a single tube for feeding gas to chamber K.

Figure 4 shows a burner configuration similar to that of Figure 3 in which three ducts 40; 42 and 43 feed gas to chambers P, S; N, T and R respectively.

The ducts are mounted on end plates 14,15 and dividers 44,45, 46 and 47 as described below.

Duct 40 comprises three coaxial tubes 48,49 and 50. The left and right hand ends of tube 48 are upset to form peripheral shoulders 52,53. The ends of the tube 48 beyond the shoulders are then located in apertures 54, 55 formed in dividers 45,46 and are widened so as to urge the dividers against the adjacent shoulders 52, 53 and to urge the periphery of the tube into gas sealing contact with the apertures. A washer 56 is positioned coaxially in the widened right hand end of the tube 48 and is held captive by tube 49 which sealingly locates in the widened end. The right hand end of tube 49 is formed in an identical manner to the right hand end of tu be 48 and sealingly locates in an apertures 57 in divider 47.The widened end of tube 49 sealingly locates tube 50 which has its right-hand end formed in an identical manner to the right hand ends of tubes 48 and 49 so as to locate sealingly in an aperture 58 in end plate 15. A gas supply pipe (not shown) is connected, in use, to the widened right hand erid of tube 50. Tube 49 is formed with two diametrically opposed ports 59. Gas fed to duct 40 passes into pipe 49 and encounters a constriction 60 created by the washer 56. The constriction is selected so that a desired quantity of gas will pass through ports 59 into chamber S and a similar quantity of gas will pass through the constriction 60 into chamber P. For a tube bore of 10.3mm, a port diameter of 8mm and a constriction diameter of around 8.5mm has been found suitable.However the bore, the port diameter and the constriction diameter will vary in accordance with gas feed rate and pressure.

The remaining ducts 42,43 are constructed in a similar manner so as to sealingly engage the dividers and end walls. Duct 42 comprises tubes 62, 63,64 and 65 and duct 43 comprises tubes 66 and 67.

The tube 62 is formed with ports 68 similar to ports 59 and is associated with a washer 69 which provides the necessary constriction.

To assemble the burner of Figure 4, the ducts are initially secured to the associated end walls and dividers priorto location with thetrough-like body 10. Thus the tube 66 is secured to end wall 14, tubes 65, 67 are secured to divider 44, tubes 48, 64 are secured to dividers 45,46, tubes 49, 63 are secured to divider 47 and tubes 50, 62 are secured to the end wall 15. Next, the tube 67 is located in an aperture 69 in divider 45 and the tube 65 is located in the widened left hand end of the tube 64. The free end of tube 66 is then located in the widened left-hand end of tube 67.Tubes 49, 63 are then located in the widened right-hand ends of tubes 48,64 and tubes 50,62 are located in the widened right-hand ends of tubes 49, 63. The assembled end walls, dividers and ducts are then placed in the body and the dividers and end walls may be held therein in a manner described in our aforesaid co-pending patent application. A perforated outlet plate 16 is then placed in position on the body and held suitably in position.

The peripheral shoulders on the tubes forming the infeed ducts are positioned to space the dividers and end walls appropriately.

Figure 5 illustrates an alternative method of interconnecting the tubes of the dual tube ducts in Figures 1 to 4, the tubes 48, 49 of duct 40 in Figure 4 being illustrated by way of example. Instead of widening the tube 48, the tube is a sealing and friction fit in the aperture 55 and the left hand section of an internal annular connector 70 is sealingly located in the tube. The connector 70 has a peripheral shoulder 72 which abuts the end of tube 48. The tube 49 is then pushed on to the right hand section of the connector and the two tubes are thereby gas sealingly interconnected. The internal diameter of the connector 70 may be selected to provide the desire constriction 60 downstream of the ports 59. In certain cases it may be desirable to utilise a duct extending through the entire body 10 between the end plates 14, 15 and to feed gas into both ends of the duct.In such a case, a connector 70 haveing no internal bore may be used in the duct to form a blanking member so that gas fed into one end of the duct will enter one chamber or set of chambers and gas fed into the other end of the duct will enter a different chamber or set of chambers.

It is envisaged that a duct formed with a radial port and associated constriction or a plurality of such ports and constrictions can be used to feed gas to burners other than the trough-body type burners illustrated in the accompanying drawings and may feed any number of chambers in such alternative burners.

Whilst specific reference has been made to burners having from three to five chambers it will be understood that a burner in accordance with the invention may comprise six or more chambers. In such cases a plurality of infeed ducts may extend from each end of the body in any combination of numbers.

Where a multiplicity of chambers are to be fed with gas it may be desirable to run one or more of the ducts along the outside of the body and to feed the gasthrough the wall. Such an arrangementwill prevent the interior of the body becoming overcrowded with infeed ducts. However two provide greater interior accommodation for the ducts the depth of the body and/or its width can be increased where practicable.

Ducts which feed a plurality of chambers may each have an internal diameter greater than that of a duct which feed only one chamber.

The term "duct" as used herein includes any means defining a passage for gas e.g. a venturi tube, pipe or such like.

Claims (19)

1. A gas burner comprising an elongate hollow body divided into a plurality of chambers arranged end-to-end, gas outlet means for the chambers and an infeed duct extending longitudinally of the body for feeding gas to the chambers.

2. A burner according to claim 1, wherein a plurality of infeed ducts extends longitudinally of the body for feeding gas to selected chambers.

3. A burner according to claim 2, wherein the hollow body is divided into chambers by transverse divider members and at least one of said infeed ducts passes through one or more of said divider members.

4. A burner according to claim 3, wherein the said one infeed duct comprises a first section which feeds gas to a first chamber and a second section passing through one or more divider members to feed gas from the first chamber to one or more further chambers.

5. A burner according to claim 4 wherein the second section of the infeed duct is arranged to feed gas from the first chamber to a second chamber spaced from the first chamber by at least one other chamber.

6. A burner according to any preceding claim, including radial ports in wall portions of the duct sections through which ports gas can be fed to respective chambers.

7. A burner according to claim 3 wherein said one infeed duct is continuous and is formed with a first outlet through which gas passes into said first chamber and a second outlet through which gas passes into one or more further chambers.

8. A burner according to claim 7, wherein the continuous duct comprises a plurality of tubes placed together in end-to-end alignment.

9. A burner according to claim 8 wherein said tubes are interconnected frictionally by annular internal connectors.

10. A burner according to any of claims 7 to 9, wherein the continuous duct is formed with first and second outlets and one of the outlets comprises an open end of the continuous duct downstream of the remaining outlets.

11. A burner according to claim 10 wherein the or each remaining outlet comprises a radial port in a wall of the duct.

12. A burner according to claim 11, wherein a construction is provided in the duct downstream of each radial port to cause gas to flow outwards through the associated radial port.

13. A burner according to claim 12, wherein each constriction comprises one of said annular connectors.

14. A burner according to claim 3, wherein a duct passes through two or more divider members and includes spacer means thereon which space the divider members to facilitate assembly of the burner.

15. A gas burner having a gas infeed duct through which gas can be fed to a chamber of the burner, said duct being formed with a port in a wall thereof and being constricted downstream of the port so that some of the gas travelling through the duct will be diverted through the port into said chamber and the remainder will flow through the constriction.

16. A burner according to claim 15 arranged so that the remainder of the gas can be fed to one or more further chambers in the burner.

17. A burner according to claim 16, wherein the duct is formed with a plurality of further ports associated with respective further constrictions, which further ports are arranged to feed gas to respective further chambers.

18. A burner according to any of claims 15-17, wherein the or each constriction comprises an annular connector for tubes from which the duct is constructed.

19. A gas burner substantially as herein described with reference to the accompanying drawings.