GB2174489A - Gas burner - Google Patents

Abstract

A gas burner has a gas infeed duct 48 formed with a port 59 in its wall and constricted at 70 downstream of the port so that some of the gas travelling through the duct will be diverted through the port and the remainder will flow through the construction. Several ports serving respective chambers of the burner may be provided, with a constriction downstream of each port. <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 the invention there is provided 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 remaindex 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 burner 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 one type of triplex burner, and Figure 2 is a cross-section through an infeed duct comprising tubes interconnected by annular internal connectors.

Figure 1 shows a burner configuration 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. Awasher 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 mannerto the right hand end of tube 48 and sealingly locates in an aperture 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 end 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 thrug h the constriction 60 into chamber P. For a tube bore of 1 0.3mm, 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 two ports 59 and is associated with a washer 69 which provides the necessary constriction.

To assemble the burner of Figure 1, the ducts are initially secured to the associated end walls and dividers prior to location with the trough-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 copending 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 2 illustrates an alternative method of interconnecting the tubes of dual tube ducts, the tubes 48, 49 of duct 40 in Figure 1 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 desired 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 having 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 gas through that wall. Such an arrangement will prevent the interior of the body becoming overcrowded with infeed ducts. However to 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 included any means defining a passage for gas e.g. a venturi tube, pipe or suchlike.

Claims (8)

1. 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.

2. A burner according to claim 1 arranged so that the remainder of the gas can be fed to one or more further chambers in the burner.

3. A burner according to claim 2, 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.

4. A burner according to any of claims 1-3, wherein the or each constriction comprises an annular connectorfortubes from which the duct is constructed.

5. A burner according to claim 1 in which the gas infeed duct comprises two tubes jointed by an annular connector, the annularconnector providing the constriction.

6. A burner according to claim 5 in which the annular connector is sealingly located in a tube.

7. A burner according to claim 5 in which the annular connector gas sealingly interconnects the two tubes.

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