GB2334777A

GB2334777A - Gas burner

Info

Publication number: GB2334777A
Application number: GB9904590A
Authority: GB
Inventors: Gabriele Mori
Original assignee: WALKOVER Srl
Current assignee: WALKOVER Srl
Priority date: 1998-02-27
Filing date: 1999-02-26
Publication date: 1999-09-01
Anticipated expiration: 2019-02-26
Also published as: IT1306039B1; GB2334777B; DE19908224B4; DE19908224A1; GB9904590D0; ITPR980015A1

Abstract

In a gas-powered hot air generators for heating rooms, a pipe (11), which is connected to a burner (7), is located inside a tubular structure (10) with its inlet offset with respect to the axis of rotation of a fan (9) the gas being forced by the air stream produced by the fan which conveys the gas to the burner.

Description

1 2334777 GAS-POWERED HOT AIR GENERATOR FOR HEATING ROOMS DESCRTPTION The

present invention relates to a gas-powered hot air generator for heating rooms.

For some time the practice of using portable hot air generators to heat working areas, in particular confined areas such as small warehouses and workshops, has become widespread; said generators, being mounted on a wheeled frame, have the advantage that they can be moved and consequently are able to concentrate the stream of hot air in the areas where it is most needed.

These generators of the known type essentially consist of a gas delivery device, a fan and a burner unit, the fan and burner being both positioned along the same longitudinal axis; the gas is contained, compressed in the liquid state, inside a pressurised vessel and it is precisely the pressure of the gas itself leaving the delivery device which sucks up and draws with it the air required for combustion.

Said generators of the known type operate in an excellent and reliable manner, but have the drawback that they are able to use only pressurised gas: the absence of pressure or a low pressure would, in fact, prevent supplying of the comburent air to the burner unit.

The object of the present invention is that of providing a hot air generator which has the possibility of using also ordinary mains gas or in any case low-pressure gas.

These and other objects are all achieved by the hot air generator for heating rooms, according to the present invention, characterized in that it comprises a pipe for supplying to a burner the gas emitted frorn a gas delivery device, said pipe having its inlet which is offset with respect to the axis of rotation of the fan itself, said supply being forced by the air stream produced by a fan which conveys the gas towards the burner.

These and other characteristic features will emerge more clearly frorn the following c 2 description of a preferred embodiment illustrated, purely by, way of a non-limiting example, in the accompanying plate of drawings, in which:

- Figure 1 shows a perspective view of a hot air generator with an external tubular structure which is transparent so that the internal parts may be seen; - Figure 2 shows a longitudinal front view of the generator; - Figure 3 shows an exploded perspective view of another embodiment of the generator; - Figure 4 shows a longitudinal front view of the generator according to Figure 3.

With reference to Figures 1 and 2, 1 denotes a gas delivery device and 2 an associated nozzle.

Said delivery device is integrally attached to a frame 3 and has a thermostatic safety valve 4 able to shut off the gas supply in the absence of a flame, a pushbutton 5 for activating a piezoelectric device 6 igniting the gas/air mixture inside a burner 7 and a switch 8 for operating a fan 9. The burner 7 and the piezoelectric device 6 are housed inside a substantially cylindrical tubular structure 10 aligned with the fan 9 and attached to the frame 3. A pipe 11, one end of which is connected to the burner 7, is also positioned inside the said tubular structure, while its inlet, which is aligned with the gas nozzle 2, nearly touches the internal surface of the tubular structure 10. Operation of the hot air generator for heating rooms, according to the present invention, is now described with reference to the numbers indicated in the figures. When the tap of the gas mains or of the pressurised vessel containing liquid gas is opened. the gas flows to the delivery device 1, emerging from its nozzle 2. Since said nozzle is located directly in front of the inlet of the pipe 11, the gas, flowing through it as a result of the circulation of forced air by the fan 9, reaches the burner 7: in this way even non-pressurised gas such as mains gas reaches the burner 7 mixed with a 3 sufficient quantity of comburent air to ensure combustion.

Since the inlet of the pipe 11 is located more directly in front of the vanes of the fan 9 than in front of the dead zone corresponding to the axis of rotation of the fan itself, a fairly large stream of air enters into the said pipe.

The stream of air produced by the fan moreover expels the air which has just been heated from the tubular structure 10.

A further embodiment, illustrated in Figures 3 and 4, envisages the presence, inside the tubular structure 10, of two separate pipes 12 and 13, the former being intended mainly for the forced supply of the gas to the burner 7 and the latter being intended exclusively for supplying air to the burner itself.

The respective inlets of said pipes are located in the vicinity, of the internal surface of the said tubular structure and therefore are offset with respect to the axis of rotation of the fan 9.

The inlet of the pipe 12 is located directly in front of the nozzle 2.

In this solution the said two pipes are located substantially diametrically opposite one another.

During operation, the pipe 12 supplies to the burner 7 gas together with air forced by the rotation of the fan 9, while the pipe 13 conveys only air; in this second embodiment, therefore, there is a greater supply of air to the burner 7.

Obviously several pipes 13 which all have the function of supplying air to the burner may be provided.

1 4

Claims

1 Gas-powered hot air generator for heating rooms, characterized in that it comprises a pipe (11) for supplying to a burner (7) the gas emitted from a delivery device (1), said pipe ha-,.,lng its inlet offset with respect to the axis of rotation of the fan itself, said supply being forced by the air stream produced by a fan (9) which conveys the gas to the burner. Generator according to Claim 1, characterized in that the offset arrangement of the inlet of the pipe (11) is such that the inlet itself is positioned, inside a substantially cylindrical tubular structure ( 10) designed to convey the stream of heated air, in the vicinity of the internal surface of the said tubular structure.

3. Hot air generator for heating rooms, characterized in that the gas and air merge, forced by the air stream produced by the fan (9), towards a burner (7) through at least two pipes (12) and (13), the inlets of which are both positioned offset with respect to the axis of rotation of the said fan, said two pipes converging into a single pipe at the inlet to the said burner.

4. Generator according to Claim 3, characterized in that both the inlets of the said pipes (12) and (1 3)) are positioned in the vicinity of the internal surface of the tubular structure ( 10). Generator according to Claims 1 and 3, characterized in that the inlets of the pipes (11), (12) and (13), on account of their offset arrangement with respect to the axis of rotation of the fan (9), are located more directly in front of the vanes of the said fan, managing, for this reason, to channel a greater quantity of combustion air.

5.

6. A hot air generator substantially as herein described with reference to and as shown in Figures 1 and 2.

7. A hot air generator substantially as herein described with reference to and as shown in Figures 3 and 4.