GB2226876A

GB2226876A - Designate figure

Info

Publication number: GB2226876A
Application number: GB9000094A
Authority: GB
Inventors: William Henry Deryk Morris; Michael Peter Walshe
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-01-04
Filing date: 1990-01-03
Publication date: 1990-07-11
Anticipated expiration: 2010-01-03
Also published as: GB2226876B; GB9000094D0

Abstract

A pressure jet burner 10 comprises an oil or gas nozzle in a blast tube 15 which is pivotally mounted on a housing 11 for adjustment from a horizontal position (Figure 1) to a vertical position (Figure 6 not shown) or any intermediate position. A fan is located in a housing 12 for supplying air to the blast tube 15 via a horizontal duct 14. The burner 10 may replace a firegrate in a cooker/boiler (Figs 7, 8; not shown) where it provides maximum heating to a surrounding boiler water jacket (50) with the blast tube horizontal and to an oven and hotplate in the vertical position. <IMAGE>

Description

ADJUSTABLE PRESSURE JET BURNER The present invention relates to improvements in pressure jet burners of the type which use oil or gas as fuel.

According to the invention there is provided a pressure jet burner comprising a blast tube mounted on a housing, characterised in that the directional position of the blast tube is adjustable.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a perspective view of a pressure jet burner according to the invention; Figure 2 is a side view of the burner of Figure 1; Figure 3 is a perspective view of the fittings inside the blast tube with the blast tube removed; Figures 4, 5 and 6 are diagrammatic side views of the burner of Figure 1 but incorporating an automatic adjusting means for the blast tube; Figure 7 is a front view of the burner of Figure 1 installed in a conventional cooker/boiler; Figure 8 is a side view of the burner of Figurel installed in a conventional cooker/boiler.

Figure 9 shows a second embodiment of the invention; and Figure 10 shows a third embodiment of the invention.

Referring now to the drawings wherein similar numerals have been used to indicate like parts there is shown therein a pressure jet burner generally indicated at 10 according to the invention. The burner 10 is generally similar to that described in the Applicant's co-pending British Patent Application No. 8908473.5 filed on April 14, 1989 and entitled "Improved Pressure Jet Burner", the contents of which are incorporated herein by reference.

The burner 10 comprises a housing 11 including a fan housing 12 in which is located a fan (not shown) which draws air into the housing 11 via apertures 13.

The fan housing 12 communicates with a generally horizontal duct 14 for supplying air to a blast tube 15.

An electric motor 16 is mounted on the fan housing 12 and drives the fan and also operates a fuel pump 17 as is known in the art. The fuel pump 17 supplies fuel to the blast tube via a supply pipe (not shown) in conventional manner. Thus, air which is drawn into the fan housing 12 is forced through the horizontal duct 14 to the blast tube 15. As shown, the blast tube 15 is mounted on an upstanding hollow support 18 which communicates with the duct 14.

The blast tube 15 is generally cylindrical and is formed in the shape of a right angle. The blast tube is movable from a position in which it extends generally horizontally parallel to the duct 14 (Figure 1) to a position in which it extends generally vertically upwards (Figure 6) relative to the duct 14 and may be also positioned in a number of intermediate positions.

In Figure 3 the blast tube has been removed to reveal the fuel dispensing nozzle 20. The blast tube 15 is normally fixed by means of a screw 21 which engages in an aperture 22 in a lug 19 which extends laterally outwards from the nozzle 20. The fuel pipe from the fuel pump 17 is connected to a boss 23 which supplies fuel to the nozzle 20. The boss 23 is fixed to the support 18 and the nozzle 20 can rotate relative to the boss 23.

An actuating rod 24 which is fixed to the nozzle 2 extends into the hollow support 18. The actuating rod 24 is held between the upper ends 25 of a 'U' shaped control member 26, the lower end 27 of the control member 26 being fixed to an operating arm 28 which extends through the duct 14. The operating arm 28 has a handle 29 by which a user may move the operating arm 28 to adjust the directional position of the blast tube 15.

Thus, as the operating arm 28 is moved backwards and forwards the 'U' shaped control member 26 causes the nozzle 20 and the blast tube 15 to rotate between a horizontal and a vertical position. Thus the angular position of the blast tube may be adjusted.

As shown more clearly in Figures 4, 5 and 6 the directional position of the blast tube 15 may be adjusted automatically by means of a hydraulic ram 30 which is mounted on the underside of the duct 14. Thus, as shown a bracket 31 is connected between the operating arm 28 and the actuating arm 32 of the hydraulic ram 30.

A suitable control system (not shown) is provided to energise the hydraulic ram 30 and move the blast tube to a position in which it heats either the oven or the boiler of a typical cooker/boiler (not shown). The control system for the hydraulic ram may be controlled by a thermostat connected to either the boiler, the oven or both. It will be appreciated that various types of control apparatus may be used for adjusting the position of the operating arm 28 and thus the position of the blast tube 15, for example, a pneumatic ram or an electric motor etc.

In use, the burner 10 is installed in a conventional cooker/boiler as shown in Figure 7 having a water jacket 38. The burner 10 is installed by removing the firegrate and resting a mounting plate 40 on the normal grate supports 41. The plate 40 is made secure and air tight by packing ceramic fibre 42 around the edges of the plate 40 as shown. Further, at one end 43 of the duct 14, the burner has a projecting lip 44 which engages on the mounting plate 41 and at the opposite end 45 the duct 14 has a rotatable lug 46 which also engages on the opposite end of the mounting plate to secure the burner in place. The rotatable lug 46 is operated by a lever 47 on the underside of the duct 14.

Thus, as shown in Figure 8, the blast tube 15 will provide maximum heating to the water jacket 50 and when moved to its vertical position it will provide maximum heat to the oven and hot plate of the cooker/boiler.

By fitting a ceramic heat shield as indicated in dotted outline at 60 in Figure 8, the direction of heat to either the boiler or oven can be further controlled.

Further, a ceramic heat shield 61 may be fitted around the blast tube 15 as shown in dotted outline in Figure 8 to additionally control the heat to the horizontal direction. When the blast tube 15 is moved to the vertical position the heat shield 61 will again mate with heat shields 60 to control the heat to the vertical direction.

Referring now to Figure 9 there is shown a second embodiment of a pressure jet burner according to the invention. This embodiment is similar to that shown in Figure 1 except that the blast tube 15 is disposed generally above the fan housing 12. In Figure 9 similar reference numerals have been used to indicate parts corresponding to those in Figure 1.

Referring now to Figure 10 there is shown another embodiment of a burner according to the invention generally indicated at 70. For the sake of clarity only the differences between the present embodiment and that shown in Figure 1 will be described. Similar reference numerals have been used to indicate parts corresponding to those in Figure 1.

Thus, the burner 70 comprises a housing 11 having a horizontal part 14 which terminates in an expansion chamber 71. The blast tube 15 is mounted on a support 72 which is pivotally connected by means of a hinge 73 to the housing 11. The support 72 has a rear leg 74 which projects downwardly into the expansion chamber 71.

The rear leg 74 forms a seal against a resilient member 75 which projects to the right in the drawing from the rear surface 76 of the expansion chamber.

A right angled support arm 77 is also fixed to the rear surface 76 of the expansion chamber and provides support for a pin 78 the purpose of which will now be described. A ratchet arm 79 is pivotally mounted on the support 72 and has a plurality of teeth 80 which can engage with the pin 78 to select the angular position of the support 72 and thus of the blast tube 15.

The fuel line 81 from the pump 17 is attached to a flexible length of fuel line 82, the other end of which is connected to a nozzle 83 mounted in or adjacent to the blast tube 15 as is well known in the art.

Thus, through the provision of the flexible fuel line 82, the hinged support 72 and the positioning ratchet 78, 79, the angular orientation of the blast tube can be selected to the desired position. This enables the blast tube to direct heat at different regions of a boiler (not shown) when different quantities of hot water are required. Thus, in summer time if only small quantities of hot water are required, it may be desirable to position the blast tube in the position indicated in dotted outline 15' to heat only the top of a boiler.

It will be appreciated that a variety of means may be employed to enable angular adjustment of the blast tube position.

It will be further appreciated that the blast tube 15 and nozzle 20 may be adjustable in a horizontal plane. For example, the nozzle 20 which carries the blast tube 15, may be mounted onto the boss 23 by means of a universal joint to permit adjustment of the blast tube in both the horizontal and vertical directions. The shape of the blast tube and the adjustment mechanism may of course have to be varied to permit appropriate adjustment both vertically and horizontally.

Claims

CLAIMS:

1. A pressure jet burner comprising a blast tube mounted on a housing, characterised in that the directional position of the blast tube is adjustable.

2. A burner as claimed in Claim 1, wherein the blast tube is movable from a substantially horizontal position to a substantially vertical position.

3. A burner as claimed in Claim 1 or 2 wherein the blast tube may be located in any selected position intermediate said horizontal and vertical positions.

4. A burner as claimed in any preceding claim, wherein the blast tube is mounted above an air supply means for supplying air to the blast tube.

5. A burner as claimed in Claim 4, wherein the blast tube is mounted on and communicates with a generally horizontal duct, and the air supply means supplies air to the duct.

6. A burner as claimed in any preceding claim wherein the blast tube is fixed to a nozzle of the burner, the nozzle having an actuating rod which is operatively associated with an operating arm such that movement of the operating arm adjusts the position of the blast tube.

7. A burner as claimed in Claim 6 when dependent on Claim 5 wherein the operating arm extends through the horizontal duct, and carries a generally 'U' shaped member which engages with the actuating rod.

8. A burner as claimed in any preceding claim wherein there is provided means for automatically controlling the directional position of the blast tube.

9. A burner as claimed in any preceding claim, wherein the blast tube carries a heat shield.

10. A burner as claimed in any preceding claim wherein the burner has means for locating it on a mounting plate in a cooker/boiler.

11. A burner as claimed in any preceding claim wherein the blast tube is of a generally tubular right angled shape.

12. A pressure jet burner substantially as herein described with reference to and as illustrated in Figures 1 to 8, Figure 9 or Figure 10.