GB2214629A

GB2214629A - Gas burner assembly

Info

Publication number: GB2214629A
Application number: GB8820621A
Authority: GB
Inventors: Arthur Selwyn Kay
Original assignee: BURCO DEAN APPLIANCES Ltd
Current assignee: BURCO DEAN APPLIANCES Ltd
Priority date: 1988-01-27
Filing date: 1988-08-31
Publication date: 1989-09-06
Anticipated expiration: 2008-08-31
Also published as: GB8820621D0; GB8801785D0; GB2214629B

Abstract

The assembly comprises a casing 13 providing ducting connecting a blower or suction fan 12 and a gas burner 11, with an air inlet 16, and a gas inlet 17 in the region of the blower or suction fan, or downstream of the latter but upstream of the gas burner. The gas inlet may be direct into the blower fan, centrally of the blower fan, or above or below centre, or it may be disposed tangentially to the casing between the blower or suction fan and the gas burner to provide swirling gas/air mixing effect thus providing a uniform gas/air mixture. <IMAGE>

Description

GAS BURNER ASSEMBLIES This invention relates to gas burner assemblies, and to applications thereof in the fields of water and air (hereinafter and in the claims referred to generally as "fluid") heating.

It is an object to provide a z brr assembly which produce. a short-length, tait, rgh efficiency flame, which is compact in size, and which is of simple construction.

According to one aspect of the present invention there is provided a gas burner assembly comprirg a casing providing ducting connecting a blower fan and a gas burner with a gas inlet in the region of the blower fan or downstream of the latter but upstream of the gas burner in terms of air flow fron the blower fan to the gas burner.

The gas inlet may be directly into the blower fan centrally of the impellor thereof or above or below centre.

The gas inlet may be between the blower fan and the gas burner and arranged to provide a tangential inflow of gas into the air stream to provide for uniform gas/air mixing.

According to another aspect of the present invention there is provided a gas burner in which the gas/air mixture outlet porting is constituted by adjacent alternate flat and corrugated elements.

Preferably, the gas burner outlet porting is constituted by a flat strip of metal in face-to-face contact with a corrugated strip of metal, the two strips of metal being wound into a coiled configuration. This produces a substantial outlet porting area for gas/air mixture egress.

The metal strips are preferably narrow in width, i.e. the distance between gas/air inlet and gas/air outlet.

The gas burner preferably has a central non-ported area where a spark ignition electrode and a flame sensing probe may be incorporated to provide control of the gas burner from wfull flame" to "off".

The gas burner is preferably fan assisted, a blower fan and/or suction ran Deing duct connected tnereto. The gas burner is preferably duct connected to an air blower fan at one end and connected to a heater exchanger at another end.

Alternatively, the gas burner is connected to a heat exchanger to which is connected, remote from the gas burner, a suction fan.

It is to be clearly understood that the fan assistance applied to the gas burner, in any of its applications, may be blowing and/or suction fan assistance.

The fan-assisted gas burner according to the present invention may, in a most general sense, be considered a fan-powered gas convector heater which can be applied to any appropriate gas-fired equipment. For example, it may be employed, inter alia, in a gas-fired tumbler dryer.

The primary but not exclusive application of the fan-assisted gas burner according to the present invention is in the field of water heating, especially but not exclusively for central heating and/or domestic hot water heating purposes. In the latter instance, it is particularly suitable for heating substantial quantities of domestic hot water.

The gas burner outlet porting may alternatively be constituted by a plurality of co-axial alternate flat and corrugated discs or plates.

Yet another aspect of the present invention is the combination of a hot water cylinder or other storage receptacle having mounted on a side thereof a fan-assisted gas burner assembly according to this invention.

This side mounting as opposed tc the conventional bottom mounting of the gas burner assembly results from the configuratior of t:.

burner according to the present invention, particularly the configuration of the outlet porting thereof. The main advantages of this side mounting are ease of fitment, replacement and maintenance.

The exhaust gases from the gas burner assembly can readily be piped to an appropriate safe exhaust location, for example, to the outside of domestic premises distant from a hot water supply cylinder of a central heating system due to the fan assistance.

Accordingly, the cylinder need not be located adjacent to an external wall of a room.

The compact nature of the gas burner assembly also permits the need for back boilers to be superceded.

The gas burner assembly, according to the invention, preferably has electronically-controlled monitoring and ignition, and gas supply means.

Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a side elevation of a gas burner assembly according to the invention; Fig. 2 is a corresponding front elevation of the gas burner assembly; Fig. 3 is a fragmentary sectional view, to an enlarged scale, of the gas porting of the gas burner of the gas burner assembly; Fig. 4 is a side view of a hot water cylinder and the associated gas burner assembly according to the invention; Fig. 5 is a view similar to Fig.4 of an alternative hot water cylinder and gas burner assembly combination; Fig. 6 is a side elevation similar to Fig. 2 of an alternative configuration of gas burner assembly;; Fig. 7 is a perspective view o- a not water boiler with the gas burner assembly of Fig. 6 associated therewith; Fig. 8 is a diagrammatic detail transverse section of the gas burner assembly at the gae inlet location; and, Fig. 9 is a detail side view of an alternative gas burner.

Referring to Figs.l to 3, the gas burner assembly 10 comprises a gas burner 11, a blower fan 12 and a casing 13 providing connecting ducting therebetween.

The blower fan 12 comprises a motor 14 external to the casing 13 and driving a fan impeller 15 inside the casing 13. An air inlet to the casing 13 is indicated at 16 and a gas inlet pipe at 17, the gas inlet pipe 17 delivers gas to the centre of the fan impeller 15. The inlet pipe 17 may, of course, deliver gas to the top or bottom of the fan impellor 15 where a low or high gas pressure situation prevails respectively.

The communicating duct between the fan impeller 15 and the gas burner 12 is indicated at 18.

The gas burner 12 is housed within an annul us 19 of the casing 13 and is constituted by two metal strips 20,21.

The metal strip 20 is of corrugated configuration while the metal strip 21 is of flat configuration. The two strips 20 and 21 are laid in face-to-face contact (see Fig.3) and wound into coiled configuration as indicated at 22 (see Fig.2) to form a gas burner 12 with a substantial area of angularly and radially spaced gas outlet ports 23.

The coiled port-defining strips 20, 21 are disposed around a centra mounting boss, sleeve cr similar 24 which serves to support a spark ignition electrode and a flame-sensing probe, both not shown and forming part of an electronic ignition and gas control arrangement, also not shown.

The gas burner assembly 10 (see Fig. 4) is fitted to the wall 25 of a hot water cylinder 26 forming part of a central heating system and/or a domestic hot water supply system (neither shown).

Water inlet and/or outlet passages for the cylinder 26 are indicated at 27.

The gas burner 12 communicates via an opening 28 in the wall 25 with a heat exchanger 29 disposed inside the cylinder 26. The heat exchanger 29 is of any convenient construction and size with the exhaust products outlet therefrom being indicated at 30.

In the instance shown in Fig.4, the heat exchanger 29 has inlet and outlet manifolds 31,32 respectively joined by flueways 33, the outlet manifold 32 being connected to the exhaust outlet 30.

The gas burner 12 produces a satisfactory, heat-efficient short flame and has, for example, a 1OKW rating sufficient in a standard semi-detached house, properly insulated with double glazing, to provide full central heating capacity, and/or substantial domestic hot water.

An alternative embodiment is shown in Fig.5 and ports the same as those in Fig.4 are designated by the same reference numerals with the suffix wA".

Here, the gas burner 34 is made up of a multiplicity of face-to-face flat and corrugated washers 35,36 respectively defining a central bore 37, the washers 35,36 defining a multiplicity of peripheral, angularly-spaced gas outlet ports. The gas burner 34 is housed in a cylindrical casing 38 externally finned as indicated at 39. The exhaust products outlet from the casing 38 is indicated at 40.

Referring to Fig. 4, the gas burner assembly 10 may alternatively be connected to the top of the heat exchanger 29 with exhaust products being expelled from the heat exchanger 29 at the bottom, i.e. the heat exchanger and gas burner arrangement shown in Fig. 4 is rotated through 1800.

The gas inlet pipe 17 (Fig. 1) may be connected into the casing 13 at the opposite side to that shown below the motor 14.

Referring now to Figs. 6 to 9, there is shown a gas burner assembly 50 similar to the gas burner assembly 10 but of figure 8 configuration.

The gas burner assembly 50 comprises a gas burner 51 which, in this instance, is constituted by a metal gauge tube 52 closed as indicated at 53 at one end, a blower fan 54 and a casing 55 of figure "8 configuration providing connecting ducting between the blower fan 54 and the gas burner 51.

The gas burner 51 may be replaced by the gas burner 11 and vice versa.

The blower fan 54 is generally of the same construction as the blower fan 12 (see motor 14, fan impellor 15 and air inlet 16). However, in this instance the gas inlet in at location 56 downstream of the blower fan 54 in terms of air flow and the gas supply pipe 57 connects tangentially (see Fig. 8) with the duct section 58 between the blower fan region 59 and the gas burner region 60 of the casing 55.

The tangential gas flow entry into the substantial axial downward air flow ensures a uniform mixing of the gas and air and a better distribution to the gas burner 51.

Gas flow and ignition controls (not s!-.o\#:n) are contained in a housing 61 at the bottom of the gas burner assembly 50.

The gas burner assembly 50 is fitted to the wall of a hot water cylinder 62 (see Fig. 7) for example which houses a heat exchanger (also nct shown) but which may, inter alia, be of the construction and configuration of either of the heat exchangers 29 or 34 of Figs. 4 and 5 respectively.

A gas burner assembly according to the present invention can satisfy of central heating system of 12KW to 15KW capacity.

The gas/air mixing configuration of the gas burner assembly 50 provides increased mixing space compared with gas burner assembly 10.

Claims

1. A gas burner assembly comprising a casing providing ducting connecting a blower fan and a gas burner with a gas inlet in the region of the blower fan or downstream of the latter but upstream of the gas bur. r te terms of air flow from thin blower fan to the gas Burner.

2. A gas burner assembly as claimed in claim 1 in which the gas inlet is directly into the blower fan.

3 A gas burner assembly as claimed in claim 2 in which the gas inlet is disposed centrally of the blower fan, or above or below centre.

4. A gas burner assembly as claimed in claim 1 in which the gas inlet is disposed tangentially of the casing between the blower fan and the gas burner to provide swirling gas/air mixing effect thus providing a uniform gas/air mixture.

5. A gas burner assembly as claimed in claim 4 in which the casing is of figure 8" configuration to provide more substantial gas/air mixing space.

6. A gas burner assembly as claimed in any one of claims 1 to 5 in which the gas/air mixture outlet porting of the gas burner is constituted by adjacent alternate flat and corrugated elements.

7. A gas burner assembly as claimed in claim 6, in which the gas burner outlet porting is constituted by a flat strip of metal in face-to-face contact with a corrugated strip of metal, the two strips of metal being wound into a coiled configuration to produce a substantial outlet porting area for gas/air mixture egress.

8. A gas burner assembly as claimed in claim 7, in which the metal strips are narrow in width, i.e.

the distance between gas/air inlet and gas/air outlet.

9. A gas burner assembly as claimed in any one of claims 6 to 8, in which the gas burner has a central non-ported area where a spark ignition electrode and a flame sensing probe is incorporated to control output of the gas burner from "full flame" to off .

10. h gas burner assembly as claimed 1 ar.) on of claims 1 to 5, in which the gas burner has outs' porting defined by a plurality of co-axial alternate flat and corrugated discs of plates assembled to define a bore closed at one end.

11. A gas burner assembly as claimed in any one claims 1 to 5 in which the gas burner comprises a metal gauge tube closed at one end.

12. A gas burner assembly, substantially as hereinbefore described with reference to Figs. 1 to 3 or Figs. 6, 8 and 9 of the accompanying drawings.

13. A gas burner assembly as claimed in any one of claims 1 to 12 operatively connected to a gas-fired appliance.

14. A gas burner assembly as claimed in claim 13 operatively connected to a heat exchanger disposed in a hot water cylinder or other storage receptacle.

15. A gas burner assembly, heat exchanger and hot water cylinder combination, substantially as hereinbefore described with reference to Figs. 1 to 5 or Figs. 6 to 9 of the accompanying drawings.

16. A gas burner in which the gas/air mixture outlet porting is constituted by adjacent alternate flat and corrugated elements.

17. A gas burner as claimed in claim 16 in which the gas burner outlet porting is constituted by a flat strip of metal in face-to-face contact with a corrugated strip of metal, the two strips of metal being wound into a coiled configuration to produce a substantial outlet porting area for gas/air mixture egress.

18. A gas burner as claimed in claim 17, in which the metal strips are narrow in width, i.e. the distance between gas/air inlet and gas/air outlet.

19. A alas @@@@@ claimed i.@@@@ claims 16 to li; comprising @ central non-po-te: area at which is mounted a spark ignition device and a temperature sensitive probe connectible to gas flow control means for switching the gas burner from "half flame1 to "full flame" or to "off".

20. A gas burner comprising gas outlet porting constituted by a plurality of co-axial alternate flat and corrugated discs or plates assembled to define a bore closed at one end.