FR2672665A1 - VACUUM CLEANER FOR BURNING SOLID FUELS. - Google Patents

Abstract

A device for collecting ash and/or slag, even when hot, from chimneys, stoves and/or kitchen ranges burning wood, coal or their derivatives, and storage thereof until completely cooled, comprises in particular insulated walls (11a, 11b), the parts of which in contact with the ashes can withstand high temperatures, and a fire preventing filter cartridge (20) fitted in the extraction circuit to protect the extraction turbine (T). The primary filter (24) of this device is cleaned in use by a brush (26) driven electrically or manually from outside the storage tank. The risk of turbine and dust bag overheating is further reduced by allowing ambient air (B) to enter the filtration system.

Description

 The present invention relates to a device for vacuuming and storing before cooling the combustion residues of wood, charcoal or their derivatives, burned in the various heating and cooking appliances, reducing as much as possible the risks of burns or release of dust. .

 The collection of these residues, traditionally using shovels, brooms and buckets, generates dust and presents risks of burns when accessing the recesses of the device, often poses the problem of their conservation until complete. cooling.

 The device according to the invention overcomes these drawbacks. According to a first characteristic, it comprises the use of heat-resistant materials, arranged so as to reduce the heat radiation and the risk of fire.

 The device described is a vertical canister type vacuum cleaner, high, composed of a safety storage tank and a cover surmounted by the electrical equipment.

 All the elements in direct contact with the ashes are metallic or mineral, non-flammable.

 The tank is double walled, bottom included. The internal wall, which may consist of a removable container, is covered on the outside with insulating material. An air gap separates it from the external envelope, which is perforated around its periphery so that an air circulation accelerates the cooling of the ashes.

During the start-up, the aspirated ashes fall into the tank, and the air flows back towards the suction turbine, which is charged with fly ash which is sometimes glowing. This is why the use for this purpose of a normal vacuum cleaner immediately causes the fire of the usual filters in paper and fabric bags, accelerated by the forging effect "
To avoid this, a removable and removable heat-resistant fire-resistant filter cartridge is installed upstream of the circuit, composed of three cylindrical assemblies arranged concentrically
- the outer cylinder, lined with mineral wool, asbestos or other, porous, retains the micronized particles escaped from the first two filters
- the middle cylinder, lined with stainless steel wool, stops the larger dust not retained by the first filter.

 - the internal cylinder, acting as a primary filter, consists of a rigid hollow cylinder, perforated with a multitude of microscopic holes; it is he who stops almost all of the fly ash, but he quickly clogs up.

 This is why, according to a second characteristic, the cavity of this cylinder is equipped with a three-blade rotary brush, the friction of which against the walls prevents the clogging of the perforations, or at least considerably delays it. The axis of this brush crosses the wall of the device and can be actuated from the outside, when the vacuum cleaner is working, either manually by means of a simple handle, or electrically thanks to a small motor fitted with a reducer. of speed.

 The inside of the cover is also lined with insulating material; the electrical systems - suction turbine and possibly brush drive motor - are fixed on the cover, on a raised insulating sole so as to form an air space.

 The impeller can be damaged during the aspiration of very hot ashes. Also, according to a third characteristic, an ambient air intake is provided between the suction circuit and the inlet of this turbine, in order to lower the temperature of the air arriving through the circuit.

 An orifice made on the pipe taken out of the tank is closed by a quick-expanding twin-leaf spring forming a valve, its expansion, separating it from the hole, thus allows the arrival of outside air.

 The lowering of temperature thus achieved then makes it possible to provide for a final filtration of the air sucked in, before it is discharged outside the vacuum cleaner, by a conventional system of paper and fabric bags - or better, in mineral materials. , if it exists.

 The device according to the invention is particularly intended for cleaning open or closed hearth fireplaces, stoves, stoves, burning wood, charcoal, or their derivatives. It can of course be used like a conventional vacuum cleaner, and suck up water.

 Born by possibly increasing its size and that of its components, the device can be used for clearing powdery rubble, sawdust.

Claims (1)

 Monobloc vacuum cleaner for cleaning fireplaces burning solid fuels and for keeping hot residues until they cool, characterized in that it consists of a thermally insulated cover and storage tank forming a safety container, and a suction system equipped with a non-flammable filter cartridge which is ashed down during operation by a molten brush, from outside the enclosure, manually or electrically, and cooling of the suction circuit by admission automatic ambient air between the tank and the turbine through a valve made up of a rapidly expanding bimetallic strip.