ITFR20090007A1 - CLEANING SYSTEM IN FOXCOLAR CLOSED DOORS FOR SOLID FUELS (STOVES, BOILERS, FIREPLACES) - Google Patents

Description

Description attached to the patent application for industrial invention, entitled:

"Glass cleaning system in closed hearth doors for solid fuels (stoves, boilers, fireplaces)"

DESCRIPTION:

The industrial invention in question finds application in closed solid fuel hearths (wood, logs, coal).

In closed solid fuel fireplaces on the market today, most of the time the problem of keeping the glass clean during operation is not considered. Soot deposits from the glass are eliminated by manual cleaning using special detergents, with the door open and the machine cold.

Some manufacturers drill holes in the underside of the door for air inlet. This solution partially solves the problem of cleaning, since the glass is not lapped by the air uniformly and for its entire height.

The cleaning system, object of the invention, allows the complete removal of carbon residues from the entire surface of the glass. The main air flow, entering from the part below the door, is divided into two secondary flows, one lower and one upper, which completely lap the glass.

These air flows also provide the oxygen necessary to completely burn the carbon gases produced during the main combustion, especially in the wood areas (post-combustion).

Figures 1 and 2 attached represent a section and a rear view of the system. Numbers and letters indicate the following parts:

1 Door

2 Glass

3 Seal facade

4 Lower air deflector

5 Upper air deflector

6 Left lateral channel

7 Right lateral canal

main air flow

b lower secondary flow of superheated air

c upper secondary flow channeling

d upper secondary flow of superheated air

The hermetic seal between the door 1 and the facade 3 is ensured laterally and on the upper horizontal side: the air inlet is only possible from the lower part of the door (main air flow a). This flow originates from the depression due to the natural draft of the machine. After the entrance, below the door, the main flow splits into two: one part, lower secondary flow b, crosses the passage between the facade 3 and the lower air deflector 4 and goes up along the glass; the remaining part (flow c) runs through the left 6 and right side channel 7, and descends along the glass after passing through the passage between the glass 2 and the upper deflector 5 (upper secondary flow d).

The upward movement through the two lateral channels contributes to the establishment of a chimney effect between the inlet section at the bottom and the outlet section at the top: the difference in height and temperature between the two sections is such as to trigger this phenomenon .

In addition, the narrowing of the section of the aforementioned passages cause an acceleration of the air flows which ensure the total removal of carbon residues that are deposited on the glass during combustion. The lower passage section is also adjustable to optimize the quantity of air.

Ultimately, the joint action of the two flows, lower and upper, ensures complete cleaning of the glass, allowing a clear view of the flame.

A secondary effect, but not of lesser importance, is the post - combustion of the carbon gases produced during the main combustion.

The ascending and descending air flows overheat as they lick the glass, and provide the oxygen necessary to burn the unburned gases. Therefore, we see flames not released by the wood but far away from it. This phenomenon allows energy recovery, with higher yields and less polluting fumes.

Claims (1)

Claims: The cleaning system in question allows the complete removal of carbon residues from the entire surface of the door glass, through the joint action of an ascending and descending flow of superheated air; 2 The passage sections and the lateral ducts are sized in such a way as to obtain the optimal distribution of the air flows; 3 The difference in height and temperature during operation between the inlet and outlet sections of the side channels is such as to trigger the depression necessary for the establishment of the upper secondary flow of superheated air (chimney effect); 4 The narrowing of the lower and upper passage sections determine an accelerating action on the ascending and descending air flows, resulting in the removal of carbon residues from the glass. 5 The lower passage section is adjustable, in order to adapt the air flows to the different draft conditions that may arise; 6 The air flows in question provide the oxygen necessary to completely burn the carbon gases produced during the main combustion, especially in areas far from the wood (post-combustion);