WO2000066949A1

WO2000066949A1 - Firing chamber, particularly of fire stoves or fireplace inserts

Info

Publication number: WO2000066949A1
Application number: PCT/CZ2000/000025
Authority: WO
Inventors: Miloslav Zima
Original assignee: Miloslav Zima
Priority date: 1999-04-28
Filing date: 2000-04-13
Publication date: 2000-11-09
Also published as: DE10084504T1; SK15642001A3; AU3550000A

Abstract

The firing chamber, particularly of fire stoves or fireplace inserts, wherein the front and/or side surface of the wall (4) of the door (1) and/or the peripheral part of the fireplace firing chamber (6) is fitted with at least one dispersion chamber (2) fitted with the air inlet hole (7), wherein the dispersion chamber space (2) is filled with a porous dispersion material (3).

Description

Firing chamber, particularly of fire stoves or fireplace inserts

Technical field

The invention applies to the firing chamber, particularly of fire stoves or fireplace inserts, glazed fireplace doors or stove doors and/or other glazed parts of heating devices.

Background of the invention

I n case of the most simple firing chambers of fireplace inserts and fire stoves, the problem of smoke-soiling of glazed parts is not solved . This causes a very qu ick soiling with soot formation on glazed surfaces and , thus, deterioration of visibility of fire in the firing chamber.

Another known solution is fitting of heating devices with specially modified glass the surface of which is coated with a layer of catalytic substance. This substance just speeds up the process of glass self- cleaning but does not prevent depositing of soot on glass surfaces. Main disadvantage of this design lies in a high price of glass, with the practical cleaning effect being associated with problems as it is necessary to permanently maintain a high temperature so that the mentioned cleaning may take place. I n this way, consumption of fuel increases and the heating device cannot run in a saving regime. Moreover, it is necessary to use hard and well dried wood . Wood species with a higher moisture and/or resin content suppress the mentioned self-cleaning effect completely. Moreover, the catalytic layer is abraded during cleaning and disappears with time. Another design consists in separating flue gas from glass by a thin layer of air flowing as closely as possible along the glass surface The air flow enters the firing chamber space at least in one complete length of glazing A certain barrage preventing soiling is thus formed A disadvantage of this most often used design is that air flows into the firing chamber as a thin stream of high velocity created by underpressure in the firing chamber and thus it creates the injector effect that draws in and attracts flue gas to the glass vicinity in a greater extent Consequently, this injector effect dramatically deteriorates the result of the flue gas separation from the glass This results in soiling the g lass in the form of black stripes (tongues) and subsequent red uced visibility of the firing chamber interior Moreover, as the drawn-m air is also necessary for secondary combustion its sucked amount is limited The mentioned soiling is again more intensive d uring bu rning-out of faintly glowing fuel

Summary of the invention

The above mentioned shortcomings are to a considerable extent removed by the firing chamber, particu larly of fire stoves or fireplace inserts, according to this invention the principle of which is that the front and/or side surface of the door wall and/or the peripheral part of the fireplace are fitted with at least one dispersion chamber equipped with an inlet hole, wherein the dispersion chamber space is filled with a porous d ispersion material

The air sucked into the firing chamber passes through the d ispersion chamber filled with a porous dispersion material where the drawn-m air is dispersed on a larger area which results in a dramatic reduction of its flow velocity The air of a reduced velocity d ispersed in this way is d ischarged in the vicinity of glass surfaces where it forms a thick barrage of slowly flowing clean air with a very weak injector effect, wherein the amount of air necessary for secondary combustion is kept within optimum limits Just a slight amount of sucked-m flue gas can possibly penetrate the thick layer of clean air to the glass This means that an optimum amou nt of secondary air for combustion is provided and a sufficiently thick layer of slowly flowing barrage of clean air with a negligible injector effect is formed

The mam advantage of this design is seen in the fact that glasses of glazed fireplace or fire stove doors, or solid glazed su rfaces of these devices are kept clean It is preferable for a correct function that the dispersion material is metal wool and/or metal dust and/or mineral wool and/or filtration material, that the dispersion chamber is fitted in its lower part with a perforated bottom and that the perforated bottom is made from a fine netting metal material

Brief description of the d rawings

The invention will be explained in detail by means of the drawing where Fig 1 shows the front view of the fireplace insert, including location of the dispersion chamber in the front upper wall of the fireplace door, Fig 2 shows the side view of the fireplace insert with partial sectional view where the d ispersion chamber is located in the front upper wall of the fireplace door, Fig 3 shows the detail of the dispersion chamber with depicted possible air inlet and its dispersion in the firing chamber, and Fig 4 shows the side view of the fireplace, includ ing location of the d ispersion chamber in the peripheral part of the fireplace firing chamber

Examples of embodiment of the invention The firing chamber, particularly of fire stoves or fireplace inserts, as an integral part of the fireplace, according to Fig. 1 through 4 , is designed in such a way that the front surface of the wall 4 of the door is in its upper frame fitted with one dispersion chamber 2. Fig . 4 depicts location of the dispersion chamber 2 in the peripheral part of the fireplace firing chamber 6. The dispersion chamber 2 is fitted with the inlet hole 7 for supply of fresh air. The lower part of the d ispersion chamber 2 is fitted with the perforated bottom 5 , preferably made from a fine netting metal material . The dispersion chamber space 2 is filled with a porous d ispersion material 3 which is metal wool and/or metal dust and/or another non-combustible porous material.

The firing chamber, particularly of fire stoves or fireplace inserts, with the d ispersion chamber 2 serves for keeping clean glass of glazed fireplace or stove doors and/or fixed glazed surfaces of these devices.

I ndustrial applicability

The firing chamber, particularly of fire stoves or fireplace inserts, according to this invention , i .e. with the d ispersion chamber, is industrially applicable, particularly for the fire stoves or fireplaces with the glass front, side or opposite surface and can be installed into the existing fireplaces.

Claims

C L A I M S

1 . The firing chamber, particularly of fire stoves or fireplace inserts, wherein the front and/or side surface of the wall (4) of the door (1 ) and/or the peripheral part of the fireplace firing chamber (6) is fitted with at least one dispersion chamber (2) fitted with the air inlet hole

(7) , wherein the dispersion chamber space (2) is filled with a porous d ispersion material (3) .

2. The firing chamber, particularly of fire stoves or fireplace inserts, according to the Claim 1 , wherein the d ispersion material (3) is metal wool and/or metal d ust and/or mineral wool and/or filtration material.

3. The firing chamber, particularly of fire stoves or fireplace inserts, accord ing to the Claim 1 , wherein the dispersion chamber (2) is in its lower part fitted with the perforated bottom (5) .

4. The firing chamber, particularly of fire stoves or fireplace inserts, according to the Claim 3, wherein the perforated bottom (5) is made from a fine netting metal material.

4 drawings AMENDED CLAIMS

[received by the International Bureau on 4 September 2000 (04.09.00); original claims 2 cancelled; original claims 1 and 3 replaced by amended claim 1 original claim 4 renumbered as claim 2 (1 page)]

. A device for air conduction for a heating apparatus having a door (1 ), at least one glassed-in area and a firing chamber (6), where the firing chamber (6), particularly of fire stoves and fireplace inserts, is provided by a dispersion chamber (2) having the air inlet hole (7) for supply of fresh air, wherein the dispersion chamber is possibly filled with a porous dispersion material (3) characterised in that the device comprises at least one dispersion chamber (2) placed on the front and/or side surface of the wall (4) of the door (1 ) and/or the peripheral part of the fireplace firing chamber (6), wherein this at least one dispersion chamber (2) is in its lower part fitted with the perforated bottom (5).

2. The device according to the Claim 1 , wherein the perforated bottom (5) is made from a fine netting metal material.

Statement under article 19(1)

Explanation to the revision:

The international search report has shown that there exists a solution in the German Utility Model No.9401949 which seems to be similar to the solution described in the PCT/CZ00/00025. According to our opinion these two solutions are different. The dispersion chamber (42) in the DE 9401949 serves for distribution of the secondary air along the whole section of the transparent plate (28) from small output (essentially input) holes (43) and not for dispersion and especially for retardation of the secondary air which is essential for the solution of the PCT/CZ00/00025. Only in the case of sufficient retardation of the secondary air, the injector effect can be limited. From drawings and the description of DE 9401949 results that treated air is directed into longitudinal slot (52) where the air is again accelerated whereby an injector effect is created. As opposed to this solution the secondary air according PCT/CZ00/00025 is directed into a wide retarding perforated bottom (5). Application of the body (45) for the distribution of the air (analogy of the dispersion material (3) in the PCT/CZ00/00025) is not essential for reaching the required aim and it can be replaced for example by a longer dispersion channel, bigger dispersion chamber (2), labyrinth and so on.

The basic difference between DE 9401949 and PCT/CZ00/00025 is that the solution according to the PCT/CZ00/00025 retards the secondary air while the secondary air according to the arrangement of DE 9401949 is distributed along the whole width of the transparent plate (28) and is again accelerated by the longitudinal slot (52). As a consequence of this fundamental difference the speed of the output air is equal low along the whole surface of the perforated bottom (5) in the case of PCT/CZ00/00025 so that the negative pressure originating around the fast flow and the injector effect are very limited. It is also important that no further construction (like a channel (52) or an arm (40) in DE 9401949) which directs the flow of the air in any direction is placed behind the perforated bottom (5)