GB2183804A

GB2183804A - Boilers and water heaters for flues

Info

Publication number: GB2183804A
Application number: GB08529468A
Authority: GB
Inventors: George Arnold Hatch
Original assignee: CRAIGAVON HEAT EXCHANGERS Ltd
Current assignee: CRAIGAVON HEAT EXCHANGERS Ltd
Priority date: 1985-11-29
Filing date: 1985-11-29
Publication date: 1987-06-10
Anticipated expiration: 2005-11-29
Also published as: GB2183804B; GB8529468D0

Abstract

A water jacket, for a gas or oil-fired boiler, comprises at least one water-tight heating compartment 23 which extends vertically and has laterally spaced apart portions interconnected by at least three pairs of heating tubes 24. The tubes of each pair of heating tubes are spaced apart vertically a greater distance where connected to one portion than the spacing at the other portion to promote water flow therethrough. A water heater for a flue comprises a water jacket 12 and a series of spaced angularly displaced watertight tubes 15 extending thereacross. <IMAGE>

Description

SPECIFICATION Improvements in water heaters The invention relates to water heaters, of a type which can be incorporated in a flue, an improved boiler and a combination of the two.

According to one aspect of the invention, there is provided a water jacket, for a gas or oil-fired boiler comprising inner and outer walls spaced apart to define at least one water-tight heating compartment, said compartment(s) extending vertically and having laterally spaced apart portions and at least three pairs of heating tubes spanning said spaced apart portions and interconnecting same, each pair of heating tubes being spaced apart laterally and bing spaced apart vertically a greater distance where connected to one portion than the spacing at the other portion.

Preferably said spacings in the vertical direction are different for each pair of heating tubes and preferably lie on a straight line at an angle to the horizontal for the respective pairs at each portion when the spaced apart portions are co-planar.

Preferably the compartment(s) has/have water return inlet at a higher position that the outlet therefrom.

According to a further aspect of the present invention, there is provided a water heater to be interposed in a flue, the water heater comprising inner and outer peripherally-interspaced tubular members whereof the inner projects at both ends beyond the outer and is dimensioned for fitment between the integration with spaced and mutually-adjacent ends of axially-aligned flue sections, walls bridging directly between the ends of the outer member and the periphery of the inner member and sealed to both thus to define a peripherally continuous watertight chamber between the two members, nozzles at or adjacent opposite ends of the outer member for integration of the chamber into a water circulation system, a plurality of watertight tubes extend between openings in the inner tubular member, the tubes fitted therein in sealed relation with the peripheries thereof whereby the tubes participate in water circulation, the tubes being located parallel and normal to the tubular members and the tubes being angularly displaced one with each other with regular angles of displacement between adjacent tubes.

According to yet a further aspect of the present invention a boiler comprises a water heater as defined in the next preceding paragraph located in the outer flue of a water jacket as hereinbefore defined in the second, third or fourth paragraphs. With such an arrangement a tube may be provided interconnected between a lowermost position in said portion of the water jacket and an uppermost position of the chamber of the water heater to replace said nozzles.

The foregoing and further features of the invention may be more readily understood from the following description of two preferred embodiments thereof, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view, part cut away, of a water heater; Figure 2 is a plan view of the water heater of Fig. 1; Figure 3 is a side elevational view, on enlarged scale of the heater of Figs. 1 and 2 showing the connection of the heater to a boiler outlet flue, and Figure 4 is a perspective view, part cut away, of a water jacket for a boiler with the water heater of Figs. 1 and 2 located in the outlet flue thereof.

Referring to Figs. 1, 2 and 3 of the drawings, outer and inner peripherally-interspaced tubular members of a water heater to be interposed in a flue above a boiler and of annular shape in horizontal cross-section when in its upright installed attitude are denoted 10 and 11 respectively. The inner member 11 projects at both ends beyond the outer member and is dimensioned for fitment between and intergration with spaced and mutually-adjacent ends of axially-aligned flue sections. Walls 13 and 14 bridge directly between the ends of the outer member and the periphery of the inner member and sealed to both to define a peripherally continuous watertight chamber or jacket 12 between the two members 10 and 11. Outlet and inlet nozzles 20 are provided at or adjacent to opposite ends of the outer member 10 for integration of the chamber 12 into a water circulation system.A series of spaced caplanar and angularly displaced watertight tubes 15, normal to the members 10, 11, extend between openings in the inner member 11. The tubes 14 are fitted in openings in sealed relation with the peripheries thereof. The cavities 16 in the tubes 15 and the chamber 12 allows water to be heated to be circulated therethrough.

The water heater is installed in an upright attitude in a flue immediately above a normal boiler 17 (Fig. 3) and in a flue section 17a thereof and a clampable collar (not shown) is provided for securing the extension above the top wall 13 in a flue section 18 and the nozzles 20 are connected up to a water circulation system 19 for integration of the chamber and cavities therewith. Water circulates through the cavities and chamber and is heated as exhaust gases from combustion of a fire in the boiler pass up through the flue for escape up the chimney.

The installed attitude of the water heater depends on the attitude of the flue: If the flue is vertical then the water heater is upright, and if the flue is horizontal then so is the water heater.

Referring now to Fig. 4 of the drawings there is shown a perspective view, part cutaway of a water jacket for a gas or oil fired boiler with a water heater similar to.that shown in Figs. 1 to 3 located in the outlet flue thereof.

The water jacket comprises inner walls 21 and outer walls 22 spaced apart to define a water-tight heating compartment 23. In the arrangement shown the water jacket is of rectangular elevational shape. Pairs of heating tubes 24 are located between opposed inner walls 21 and are connected to compartment 23 thereat.

The pairs of heating tubes 24 are spaced apart laterally and are spaced apart vertically a greater distance where connected to one wall 21 than the spacing at the other wall 21.

Furthermore the spacings of tubes 24 in the vertical direction are different for each pair of tubes 24 and in the arrangement shown lie on a straight line at an angle to the horizontal for the respective pairs at each opposed wall 21.

With this arrangement the nozzles 20 of the water heater are replaced by a tube 25 which interconnects between a lowermost part of compartment 23 of the water jacket and an uppermost part of the chamber 12 of the water heater. Compartment 23 has an outlet 26 connected thereto at a position lower than a return inlet 27 connected thereto.

The tubes 24 are located in the fashion shown to promote water flow therethrough, in use, and both tubes 24 and tubes 1 5 are located within the water jacket and heater, respectively, to maximise the heat transfer thereto from the combustion gases of the boiler.

Claims

1. A water jacket, for a gas or oil-fired boiler comprising inner and outer walls spaced apart to define at least one water-tight heating compartment said compartment(s) extending vertically and having laterally spaced apart portions and at least three pairs of heating tubes spanning said spaced apart portions and interconnecting same, each pair of heating tubes being spaced apart laterally and being spaced apart vertically a greater distance where connected to one portion than the spacing at the other portion.

2. A water jacket as claimed in claim 1 wherein said spacings in the vertical direction are different for each pair of heating tubes;

3. A water jacket as claimed in claim 1 or 2 wherein said spacings lie on a straight line at an angle to the horizontal for the respective pairs at each portion when the spaced apart portions are co-planar.

4. A water jacket as claimed in any preceding claim wherein the compartment(s) has/have water return inlet at a higher position than the outlet therefrom.

5. A water heater to be interposed in a flue, the water heater comprising inner and outer peripherally-interspaced tubular members whereof the inner projects at both ends beyond the outer and is dimensioned for fitment between and integration with spaced and mutually-adjacent ends of axially-aligned flue sections, walls bridging directly between the ends of the outer member and the periphery of the inner member and sealed to both thus to define a peripherally continuous watertight chamber between the two members, nozzles at or adjacent opposite ends of the outer memer for integration of the chamber into a water circulation system, a plurality of watertight tubes extend between openings in the inner tubular member, the tubes fitted therein in sealed relation with the peripheries thereof whereby the tubes participate in water circulation, the tubes being located parallel and normal to the tubular members and the tubes being angularly displaced one with each other with regular angles of displacement between adjacent tubes.

6. A boiler comprising a water heater as claimed in claim 5 located in the outlet flue of a water jacket as claimed in any one of claims 1 to 4 inclusive;

7. A boiler as claimed in claim 6 wherein a tube is provided interconnected between a lowermost position in said portion of the water jacket and an uppermost position of the chamber of the water heater to replace said nozzles.

8. A water jacket, water heater or boiler substantially as hereinbefore described with reference to the accompanying drawings.