DE8815136U1 - Device for dedusting the primary air flowing into a gas burner - Google Patents

Description

j, ,if. * OC^oh. Vaillant GmbH u. Co ₄

^{GM 729} 05, DdZ, 1988

Device for dedusting the primary air flowing into a gas burner

The invention relates to a device for dedusting the primary air flowing into a gas burner, in particular an ignition gas burner, fed from a gas supply nozzle with a gas-primary air mixture.

The contamination of such a burner, in particular a LPG burner, is caused on the one hand by the deposition of dust on a gas sieve provided in the mixture guide and on the other hand by dust particles which penetrate this sieve or the gaps formed in its holder and settle in the mixture guide or on the burner nozzle.

The aim of the invention is to ensure that this problem is prevented by dedusting the primary air.

According to the invention, the flow of this primary air is directed into the gas burner for the purpose of separating the

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contained dust particles are purposefully changed in certain areas «

Such a change can be carried out in various ways within the scope of the invention*

For example, the flow of the PHmär air can be deliberately slowed down in certain areas to allow the dust particles to sink.

According to another embodiment of the method, this flow can be made to rotate in certain areas in order to separate the dust particles by centrifugal force.

Finally, the dust particles can also be separated by redirecting the flow of primary air several times.

In this context, the invention also extends •to devices suitable for carrying out these methods.

A partial slowing down of the flow can preferably be achieved by a calming chamber arranged 1m along the flow path of the primary air with a flow cross-section that is significantly larger than that of the rest of the flow path. Such a chamber,

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which the mixture-carrying agitator emanates from the burner, causes a slowing down and local calming of the primary air flow and forces the dust particles contained therein to settle.

As an inlet for the primary air, an annular gap can be provided very simply between the outside of the mixture-carrying pipe extending from the settling chamber and the wall of the chamber, the width of which determines the optimal ratio between gas and primary air.

Instead of such an annular gap, radial recesses can also be provided in the wall of the settling chamber as an inlet for the primary air.

In order to centrifuge the dust particles contained in the primary air, it is possible in a simple and effective way to provide a helical guide for the primary air in certain areas, which inevitably causes this primary air to flow in a circular manner. Such a guide can be very easily achieved by means of a pipe socket connected upstream of the settling chamber, which, together with the pipe carrying the mixture, encloses an annular space in which a helical spring is housed, which gives the primary air flow a circular movement.

Deflections of the primary air flow can be - at the same time

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if no problem - by ring flanges or similar
Chicanes can be used to extend the flow path of the primary air in certain areas.

In order to be able to remove the dust that collects in the settling chamber during maintenance, the wall of the settling chamber is
detachable at the inlet of the mixture-carrying pipe

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For further simplification, the wall of the chamber can also be closed with a removable lid for the same purpose.

When arranging chicane-forming ring flanges, these can be arranged so that they partly protrude inwards on the cover and partly protrude outwards on the outside of the mixture-carrying pipe extending from the chamber.

The subject matter of the invention is described below with reference to
Drawings of illustrated embodiments explained, In these drawings the

Figures 1 to 4 each show an ignition gas burner in a side view and in a partial section through the
Ignition gas supply nozzle and a settling chamber upstream of the inlet of the mixture-carrying pipe.

The ignition gas supply nozzle 2 connected to the ignition gas supply line 1 opens into a mixture-carrying pipe 4 in which very large openings are provided which allow the entry of primary air into the pipe 4.

The ignition flame is formed at the outlet 6 of the mixture-carrying pipe 4. The mixture-carrying pipe 4 is held together with a thermocouple 7 by a holder 8 on a gas burner (not shown) in a desired position in relation to its mixture outlet openings.

The ignition gas supply nozzle 2 feeds the mixture-carrying pipe with gas and simultaneously sucks in primary air. Both components are mixed from the opening level 5 and guided via the mixture-carrying pipe 4 to the outlet β of the ignition burner.

The primary air flows into the calming chamber 3 in the embodiment according to Figure 1 via the annular gap 10, which is formed between the outside of the mixture-carrying pipe 4 and the wall 9 of the calming chamber 3. If the primary air enters the chamber 3 via this throttling annular gap 10, its flow slows down and calms down within the chamber 3 and the significantly larger cross-section of the inlet 5 of the mixture-carrying pipe 4. As a result of this slowing down, the dust particles contained in the primary air settle.

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chen within the settling chamber 3 and can be temporarily removed from there during maintenance of the gas burner as soon as the wall 9 of the chamber 3, which is detachably attached to the holder 16, is released from this holder 16.

In the embodiment according to Figure 2, instead of the annular gap 10, radial recesses 11 are provided in the wall 9 of the chamber 3, which serve the same purpose as the annular gap 10.

In the embodiment according to Figure 3, a pipe socket 12 attached to the settling chamber 3 encloses the inlet 5 of the mixture-carrying pipe 4 at a distance. A helical spring 13 is housed in the annular space 10, which forces the primary air flowing through to enter the settling chamber 3 in a circular movement. The centrifugal forces acting on the dust particles cause the dust particles to settle in this chamber 3, preferably at its bottom.

In the embodiment according to Figure 4, several deflections are provided for separating the dust particles in the flow path of the primary air, which are embodied by ring flanges 14 forming chicanes. These ring flanges 14 are partially protruding outwards at the inlet 5 of the mixture-conducting

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the pipe 4, partly projecting inwards on a cover 15 that can be screwed onto the wall 9 of the chamber 3 and form a labyrinth for the primary air flow in which the dust particles are largely deposited.

All embodiments of the subject matter of the invention have in common that throttling elements which determine the primary air quantity, for example the annular gap 10 or the recesses H ₁ , are arranged at the beginning of the area of the primary air guide which serves for dust removal. On the other hand, the inlet 5 of the mixture-carrying pipe 4 must be as large as possible so that the primary air can be sucked in through the ignition gas supply nozzle 2 at a low flow rate in this area. In the solution according to Figures 1 to 4, the fact that the initially downward-directed primary air flow within the settling chamber 3 is diverted when it enters the inlet 5 of the mixture-carrying pipe 4 also contributes significantly to the settling of the dust particles.

In the solution according to Figures 1 to 4, the fact that the initially downward-directed primary air flow within the settling chamber 3 is deflected upon entry into the inlet 5 of the mixture-carrying pipe 4 also contributes significantly to the settling of the dust particles.

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Claims (1)

Protection claims Device for dedusting the primary air flowing into a gas burner, in particular an ignition gas burner, fed by a gas supply nozzle with a gas-primary air mixture, characterized by a settling chamber arranged in the flow path of the primary air and connected upstream of the gas supply nozzle (2) (3) with a flow cross-section that is significantly larger than that of the rest of the flow path to slow down the flow (Figures Device according to claim 1, characterized in that as an inlet for the primary air between the outside of the mixture-carrying pipe extending from the calming chamber (3) (4) and the wall (9) of the mixing chamber (3) an annular gap (10) is provided (Figure 1). Device according to claim 2, characterized in that radial recesses (11) are provided as inlets for the primary air in the wall (9) of the chamber (3) (Figure 2). Device according to one of claims 1-3, characterized by a partially helical guide of the primary air for centrifuging the dust particles contained therein (Figure 3). &igr;&igr; I I I I ( « I It I · III I 14*4 ti t · 4 5. Device according to claim 4, characterized in that a pipe socket (12) attached to the calming chamber (3) encloses an annular space with the mixture-carrying pipe (4) in which a helical spring (13) is housed, which imparts a circular movement to the primary air flow (Figure 3). 6. Device according to claim 4, characterized in that the flow path of the primary air is extended in some areas by deflections, for example ring flanges (14) or similar baffles (Figure 4). 7. Device according to one of claims 1 to 6, characterized in that the wall of the calming chamber (3) is detachably attached to the holder (16) of the gas supply nozzle (2) coaxially opposite the inlet (5) of the mixture-carrying pipe (4) (Figures 1 to 4). 8. Device according to one of claims 1 to 7, characterized in that the wall (9) of the calming chamber (3) is closed by a removable cover (15) (Figure 4). 9. Device according to claims 6 and 8, characterized in that the ring flanges (14) or similar baffles are arranged partly inwardly on the cover (15), partly outwardly on the outside of the mixture-carrying pipes (4) extending from the evaporation chamber (3) (Figure 4).