EP0913647A2

EP0913647A2 - Stoves

Info

Publication number: EP0913647A2
Application number: EP98308801A
Authority: EP
Inventors: Josef Hacohen
Original assignee: Yeoman Stoves Ltd
Current assignee: Yeoman Stoves Ltd
Priority date: 1997-10-28
Filing date: 1998-10-27
Publication date: 1999-05-06
Also published as: GB9722631D0; GB9823367D0; EP0913647A3; GB2330902A

Abstract

A stove (10) includes a housing in the form of a sealed unit. The interior of the housing contains a burner assembly (23) and an internal baffle (14) which is located to the rear of the burner assembly (23) and extends downwardly and rearwardly with its lower end spaced from the rear (19) and the base (18) of the housing. A flue (11) extends from the housing and includes a first passageway (22) for the discharge of the products of combustion from that part of the interior of the housing in front of the baffle (14) and a second passageway (24) for the supply of air to that part of the interior of the housing to the rear of the baffle (14).

Description

Field of the Invention

This invention relates to stoves and, in particular, to gas stoves.
It is an object of the present invention to provide an improved form of high-efficiency gas stove, in particular one which is safer and more installation-friendly.

Summary of the Invention

According to the present invention there is provided a stove, particularly a gas stove, which includes a housing in the form of a sealed unit in the front part of which a burner assembly is located, the interior of the housing containing an internal baffle which is located to the rear of the burner assembly and extends (or includes a part which extends) downwardly and rearwardly with its lower end spaced from the rear and the base of the housing, and a flue extending from the housing, the flue including a first passageway for the discharge of the products of combustion from that part of the interior of the housing in front of the baffle, and a second passageway for the supply of air to that part of the interior of the housing to the rear of the baffle, with the arrangement such that, during operation of the burner assembly, a flow of air through the second passageway is induced and a balanced flue system is obtained.
The inclination of the internal baffle (or of the inclined part of the baffle) to the vertical is preferably just under 20°, for example, 18°. The dimensions of the baffle and the housing are preferably such that the spacing of the lower edge of the baffle from the rear wall of the housing is substantially the same as the spacing of said lower edge from the base of the housing.
The baffle may comprise an upper vertical portion and a lower inclined portion, with the upper portion formed with a substantially centrally located aperture through which the combustion products enter the first passageway of the flue.
The flue preferably terminates, at its end remote from the housing, in a flue terminal or cowl.
Said first passageway of the flue is preferably a tubular pipe which, between the housing of the stove and the flue terminal or cowl, is wholly contained within the second passageway. This arrangement serves to provide a degree of pre-heating of the fresh air for combustion.
The burner assembly may be constructed and arranged to operate in the manner described in British Patent Specification No. 2 310 276, to which reference should be made.

Brief Description of the Drawings

Figure 1 is a diagrammatical representation of a gas stove having a rear flue assembly,
Figure 2 is a diagrammatical representation of a gas stove having a top flue assembly,
Figure 3 is a sectional side view of the stove housing of Figure 1,
Figure 4 is a rear view of the stove housing of Figure 1,
Figure 5 is a sectional plan view of the stove housing of Figure 1,
Figure 6 is a sectional side view of the stove housing of Figure 2,
Figure 7 is a rear view of the stove housing of Figure 2,
Figure 8 is a sectional plan view of the stove housing of Figure 2,
Figures 9 and 10 show the internal baffle assembly of the stove of Figure 2,
Figures 9A and 10A show the internal baffle assembly of the stove of Figure 1,
Figures 11 to 14 show the internal baffle for either the stove of Figure 1 or the stove of Figure 2,
Figures 15 to 17 show the flue cowl of the stove of Figure 1,
Figures 18 and 19 show the flue cowl of the stove of Figure 2,
Figure 20 shows a stove having a further form of cowl,
Figure 21 is a plan view of the cowl shown in Figure 20,
Figure 22 is a side view of the cowl shown in Figure 20,
Figures 23 and 24 show the exhaust of the cowl of Figure 20,
Figures 25 and 26 show a combined back plate and shield forming part of the cowl of Figure 20, and
Figure 27 shows the cover of the cowl of Figure 20.

Description of the Preferred Embodiments

Figure 1 shows a balanced flue stove 10 having a rear flue assembly 11, while Figure 2 shows a balanced flue stove 12 having a top flue assembly 13. Each of the stoves 10, 11 has a housing in the form of a sealed unit so that there is no flow of air from within the room or other space being heated into the interior of the housing or vice versa. Operation of the stove thus does not cause cold air to be drawn into the room or other space being heated and does not create draughts.
As shown in Figure 3, the interior of the stove 10 is divided by a baffle 14 into a front part (in which the burner assembly is located) and a rear part. The baffle 14 has a configuration as shown in Figures 11 to 13 and is produced by folding a blank 15 having the configuration shown in Figure 14. As shown, the baffle 14 includes an upper portion 16 which, when the baffle is fitted within the stove 10, extends vertically, and a lower portion 17 which extends at an inclination of 18° to the vertical. Within the stove 10, the lower portion 17 of the baffle 14 extends downwardly and rearwardly from the upper portion 16. The length of the baffle 14 and its location in relation to the base 18 and the rear wall 19 of the stove 10 are such that the distance between the lower edge of the baffle 14 and the base 18 is the same as the distance between the lower edge of the baffle 14 and the rear wall 19.
The upper portion 16 of the baffle 14 is formed with a generally centrally located circular aperture 20 to which a cylindrical discharge tube 21 is connected so as to provide communication between the part of the interior of the housing of the stove 11 in front of the baffle 14 and the central element 22 of the rear flue assembly 11. A burner assembly constructed and arranged to operate as described in Patent Specification No. 2 310 276 is disposed within the housing of the stove 10 at the position indicated generally as 23 in Figure 5.
The rear flue assembly 11 also includes an outer generally tubular element 24, within which the inner element 22 is contained, with the outer tubular element 24 connected to a collar 25 which provides communication between the outer tubular element 24 and the part of the interior of the housing of the stove 10 to the rear of the internal baffle 14. The rear flue assembly 11 terminates in a cowl 26 constructed as shown in Figures 15 to 17.
The cowl 26 comprises a box-like fitting having a horizontal partition 27 formed with a central circular aperture to which a sleeve 28 is connected so as to provide communication between the inner tubular element 22 of the rear flue assembly 11 and the space within the cowl 26 above the partition 27. One side wall of the cowl 26 is solid and fits against the building 29 (as shown in Figure 1), while the other three walls are formed, above the level of the partition 27, with arrays of apertures 30 through which hot combustion products can exit into the atmosphere. The three walls of the cowl 26 are also formed with second arrays of apertures 31 which are located below the level of the partition 27.
The part of the interior of the cowl 26 beneath the partition 27 and surrounding the sleeve 28 is connected to a second sleeve 32 which is connected to the outer tubular element 24 of the rear flue assembly 11. Air from the atmosphere can thus be drawn into the interior of the cowl 26 below the partition 27 through the apertures 31. It will then pass along the outer tubular element 24 into the rear portion of the interior of the stove 10 behind the baffle 14 before flowing under the lower edge of the baffle 14 so as to be available to the burner assembly.
In operation of the stove 10, the hot combustion products from the burner assembly will pass through the inner tubular element 22 for discharge into the atmosphere through the apertures 30 of the cowl 26. At the same time, air for combustion will be drawn into the interior of the stove 10 from the atmosphere through the apertures 31 of the cowl 26. Heat exchange will occur between the hot combustion products and the air for combustion, thereby providing a pre-heating effect. A high-efficiency, balanced flue stove is thus provided. Efficient operation of the stove 10 will be obtained as well as efficient heating of the room or other space in which the stove 10 is located.
An important advantage of the balanced flue stove is that, as the stove is a sealed unit, no air is withdrawn from the room in which the stove is located and no combustion products can enter the room in which the stove is located. This has health and safety advantages and is of particular benefit to sufferers from chest diseases or respiratory infections, e.g. sufferers from bronchitis.
A further advantage of the stove of the present invention is that it is installation-friendly. No chimney is required and the stove can thus be fitted simply and economically in a room or other location which is to be heated.
The stove 12 shown in Figure 2 has a top flue assembly 13 which terminates in a cowl 33 constructed as shown in Figures 18 and 19. It contains an internal baffle assembly 34 constructed as shown in Figures 9 and 10 so as to provide communication between the part of the interior of the stove 12 in front of the baffle 34 and the inner tubular element of the top flue assembly 13. The construction and mode of operation of the strove 12 will be readily apparent from the drawings and from the detailed description given above of the stove 10.
Figure 20 shows an arrangement which includes a stove 35 having a lower output that the stoves 10 and 12 described above. The housing of the stove 35 contains an internal baffle (not shown) and a burner assembly (also not shown) each constructed and arranged as described above with reference to stoves 10 and 12. The stove 35 has a rear flue assembly 36 which includes an outer tubular element 37 and an inner tubular element 38. Air for combustion flows through the outer tubular element 37 into the rear portion of the stove 35 behind the baffle before flowing under the lower edge of the baffle so as to be available to the burner assembly. The hot combustion products from the burner assembly will then pass through the inner tubular element 38 of the rear flue assembly 36 to a cowl 39.
The cowl 39 is in the form of a box-like housing having an outer cover 40 (see particularly Figure 27) produced as a steel fabrication with parts 41, 42, 43, 44, 45 and 46 constituted by steel gauze so as to allow the free flow of air into the interior of the outer cover 40. The outer cover 40 is connected to a combined back plate and shield 47 which, in turn, is connected to the outer tubular element 37 of the rear flue assembly 36. The cowl 39 also includes an exhaust 48 (see Figures 23 and 24) which is connected to the inner tubular element 38 of the rear flue assembly 36.
The exhaust 48 includes a first section 49, an intermediate section 50 and an end section 51 to which is attached a plate 52 formed with a plurality of apertures 53 so that, in the assembled condition of the cowl 39, air can flow through the apertures 35 into the space within the cowl 39 around the exhaust 48.
The combined back plate and shield 47 includes a first portion 54 which forms a sold wall for that side of the cowl 39 adjacent the surface of the wall 55 through which the flue assembly 36 is arranged to pass. The combined back plate and shield 47 includes a second portion 56, of cylindrical form, which is attached to the outer tubular element 37 of the flue assembly 36, and a third portion 57 which acts as a wind-shield and is formed with a drainage hole 58.
The areas of gauze 41 to 46 allow the free flow of air into the space within the cowl 39 around the cowl 48, and thence through the cylindrical portion 56 of the combined backplate and shield 47 into the outer tubular element 37 of the flue assembly 36. The portion 57 of the combined backplate and shield 47 ensures that, even in severe gale conditions, the velocity of the air flow through the outer tubular element 37 of the flue assembly 36 will not be such as to "blow out" the flame produced by the burner assembly.
In a further embodiment of the invention, not shown in the drawings, the flue assembly is arranged so that it passes upwardly through an existing chimney of the room in which it is fitted, rather than passing through a wall. The upper end of the flue assembly, which will be at about the level of the top of the chimney stack, will then be provided with a suitable cowl permitting the exit of the hot combustion products from the flue assembly and the entry of air for combustion into the flue assembly.

Claims

A stove which includes a housing in the form of a sealed unit in the front part of which a burner assembly is located, the interior of the housing containing an internal baffle which is located to the rear of the burner assembly and extends (or includes a part which extends) downwardly and rearwardly with its lower end spaced from the rear and the base of the housing, and a flue extending from the housing, the flue including a first passageway for the discharge of the products of combustion from that part of the interior of the housing in front of the baffle, and a second passageway for the supply of air to that part of the interior of the housing to the rear of the baffle, with the arrangement such that, during operation of the burner assembly, a flow of air through the second passageway is induced and a balanced flue system is obtained.
A stove as claimed in Claim 1, in which the inclination of the internal baffle (or of the inclined part of the baffle) to the vertical is just under 20°.
A stove as claimed in Claim 2, in which the inclination of the baffle (or of the inclined part of the baffle) to the vertical is 18°.
A stove as claimed in any one of the preceding claims, in which the dimensions of the baffle and the housing are such that the spacing of the lower edge of the baffle from the rear wall of the housing is substantially the same as the spacing of said lower edge from the base of the housing.
A stove as claimed in any one of the preceding claims, in which the baffle comprises an upper vertical portion and a lower inclined portion.
A stove as claimed in Claim 5, in which the upper portion of the baffle is formed with a substantially centrally located aperture through which the combustion products enter the first passageway of the flue.
A stove as claimed in any one of the preceding claims, in which the flue terminates, at its end remote from the housing in a flue terminal or cowl.
A stove as claimed in Claim 7, in which the first passageway of the flue is a tubular pipe which, between the housing of the stove and the flue terminal or cowl, is wholly contained within the second passageway of the flue.
A gas stove as claimed in Claim 8, in which the flue terminal or cowl comprises a box-like housing including an outer cover parts of which are formed from steel gauze.
A gas stove as claimed in Claim 9, in which a wall of the housing is formed by part of a combined backplate and shield.