Wood and / or pellet stove or insert with glass cleaning system with channelled air

Abstract

A wood and / or pellet stove or insert (4) comprising: a fixed main frame (8), delimiting a combustion chamber (12) and a brazier (16), which extend along a vertical direction (Y-Y), a front door (20) having a door frame (24) supporting a transparent plate (28) adapted to allow viewing from the outside of the combustion chamber (12) and / or the brazier (16), said door frame (24) being movable from an opening position to a closing position, at least one combustion airflow propagation system (36), in fluid connection with the combustion chamber (12), configured to create said combustion airflow comprising a primary airflow, a secondary airflow and a glass cleaning airflow (40). Advantageously, the main frame (8) comprises a main duct (48) fluidically connected to the combustion airflow propagation system (36) so as to convey at least said glass cleaning airflow (40), and the door frame (24) comprises a plurality of cleaning ducts (52) fluidically connected with a conveying mouth (56) which, in the closing configuration of the front door (20), is facing and aligned with said main duct (48) of the main frame (8) so as to receive said at least one glass cleaning airflow (40) and to convey it to said cleaning ducts (52). Advantageously, the conveying mouth (56) of the main duct (48) is delimited by bulkheads (68) which, in the closing configuration of the front door (20), abut against peripheral gaskets (72) of the door frame (24), integral with the inner face (44) of the door frame (24).

Description

FIELD OF APPLICATION

[0001] The present invention relates to a wood and / or pellet stove or insert with a glass cleaning system with channelled air.PRIOR ART

[0002] Heating equipment, such as in particular stoves or inserts, fueled with solid fuel, for example wood or pellets, are known and widely used for heating air and / or water in living spaces.

[0003] In domestic-use equipment, a flame is generated and made visible through a transparent plate facing the combustion chamber; furthermore, the heat is released into the environment thanks to the combination of radiation and convection, both forced and natural, implemented in the structure of the wood and / or pellet stove or insert.

[0004] Known-type wood and / or pellet stoves and / or inserts usually comprise a containment structure in which are housed respectively a combustion chamber, an electric igniter, a storage tank for the solid fuel, means for handling the fuel into the combustion chamber, a first pumping means, or fan, for the movement of the comburent air in blowing or suction mode and relative evacuation of the combustion fumes, a heat exchanger and a second pumping means, or fan, for the forced heat exchange and conveying of hot air into the domestic environment.

[0005] The combustion chamber usually houses a brazier into which the fuel is deposited through dedicated devices, usually of the screw type.

[0006] The comburent air is drawn from outside the containment structure thanks to the action of a fan placed downstream of the combustion chamber, operable by an electrically powered motor.

[0007] The comburent air in suction is appropriately divided into primary air, secondary air and glass cleaning air.

[0008] The ratio between the different comburent airflows depends on the passage diameters of the respective ducts.

[0009] The primary air passes in the brazier, for a first oxidation step of the pellets and production of pyrolysis / gasification gases.

[0010] The secondary air is introduced into the combustion chamber above the brazier to complete the oxidation of the pyrolysis / gasification gases.

[0011] The glass cleaning air is introduced in the combustion chamber to prevent the particulate from depositing on the transparent plate.

[0012] The gases then pass through a heat exchanger, usually placed downstream of the combustion chamber, to exchange heat with the containment structure of the equipment, which in turn dissipates it, by radiation and / or natural convection, in the domestic installation environment.

[0013] The combustion fumes are expelled from the equipment through a dedicated exhaust duct, thanks to the action of said first suction ventilation means.

[0014] Optionally, second pumping means, such as a second fan operable by an electric motor, may be provided to distribute heat into the external environment by forced convection, improving the thermal efficiency of the equipment and allowing the heating of environments other than the installation room.

[0015] Furthermore, control and management means, such as a suitably programmed electronic board, are generally provided to manage and coordinate the various electric loads provided in the equipment to enable its proper functioning.

[0016] Pellet stoves of the prior art are therefore able to meet the user's power demands, thanks to modulation from a maximum power to a minimum power, depending on the required heat demand.

[0017] On the other hand, the user also seriously considers the view of the flame in a pellet and / or wood stove and / or insert, which is considered as one of the most relevant qualitative aspects (obviously in addition to the thermal output of the equipment).

[0018] Unfortunately, on the transparent plate of biomass combustion equipment, which as mentioned is supported by a front door and faces the combustion chamber, particulate deposits over a period ranging from a few hours of combustion to several days, depending on the type of equipment and the type of fuel used.

[0019] The most widespread way to keep the transparent plate of the pellet stove clean consists of an air blade that flows in front of the transparent plate and prevents the deposition of the particulate generated in the combustion of biomass.

[0020] In the upper part of the structure, above the opening of the front door, it is therefore known to provide a duct with a deflector that conveys the air so as to create a thin air veil in front of the transparent plate.

[0021] The glass cleaning air duct and the deflector are part of the structure of the stove.

[0022] This solution does not definitively solve the problem of cleaning the transparent plate, but at least allows for extending the intervals between two manual cleaning operations by the user.

[0023] The air blade for keeping the transparent plate clean is generated by a suction fan and the air is thus drawn towards the centre of the combustion chamber to take part in the oxidation of the biomass to be burned and then exit with the combustion fumes.

[0024] A first drawback of such known solution is therefore related to the depression created in the combustion chamber by the fan depending on the required airflow rate, which generates different trajectories towards the centre of the combustion chamber.

[0025] The greater the comburent airflow rates, the better the cleaning in the lower part of the transparent plate.

[0026] At lower powers of the pellet stove, a smaller airflow rate is required, which creates shorter trajectories towards the flame in the combustion chamber, leading to less cleaning of the transparent plate.

[0027] A further drawback lies in the difficulty of precisely controlling and calibrating the passage of air between the sheet metal deflector and the surface of the transparent plate.

[0028] The front door with the transparent plate closes against the structure of the stove and the seal is ensured by a ceramic fibre rope along the entire periphery.

[0029] The sealing rope, over time, may wear out or become compressed, consequently modifying the cross-section of the air blade passage, thus no longer ensuring adequate cleaning of the transparent plate.

[0030] Solutions according to the known art are disclosed, for example, by EP 2085694 A2, KR 101 564 844 B1, US 4683868 A, DE 94 01949 U1, WO 2014 / 189334 A1.DISCLOSURE OF THE INVENTION

[0031] There is therefore a felt need to solve the drawbacks and limitations cited with reference to the prior art.

[0032] This need is met by a wood and / or pellet stove or insert with a glass cleaning system with channelled air in accordance with claim 1.DESCRIPTION OF THE DRAWINGS

[0033] Further features and advantages of the present invention will become more apparent from the following description of preferred but non-limiting embodiments thereof, in which: Figures 1a-1b show perspective views, from different angles, of a wood and / or pellet stove or insert, in accordance with a possible embodiment of the present invention; Figure 2 shows a front view of the wood and / or pellet stove or insert of Figures 1a-1b; Figure 3 shows a sectional view of the wood and / or pellet stove or insert of Figures 1a-1b, along the sectional plane III-III indicated in Figure 2; Figure 4 shows the enlarged detail IV of Figure 3; Figure 5 shows a sectional view of the wood and / or pellet stove or insert of Figures 1a-1b, along the sectional plane V-V indicated in Figure 2; Figure 6 shows the enlarged detail VI of Figure 5; Figure 7 shows perspective views, from different angles, of a front door of a wood and / or pellet stove or insert, in accordance with a possible embodiment of the present invention; Figure 8 shows a front view, from the inner side, of the front door of the wood and / or pellet stove or insert of Figure 7; Figure 9 shows a sectional view of the front door of the wood and / or pellet stove or insert of Figure 7, along the sectional plane IX-IX indicated in Figure 8; Figure 10 shows the enlarged detail X of Figure 9; Figure 11 shows a sectional view of the front door of the wood and / or pellet stove or insert of Figures 1a-1b, along the sectional plane XI-XI indicated in Figure 8; Figure 12shows the enlarged detail XII of Figure 11.

[0034] The elements or parts of elements in common between the embodiments described below will be denoted by the same reference numerals.DETAILED DESCRIPTION

[0035] With reference to the above figures, the reference number 4 globally denotes a wood and / or pellet stove or insert.

[0036] In particular, the present invention applies to biomass combustion equipment with a transparent plate for viewing the flame from the outside.

[0037] In general, the invention is valid for stove or insert applications both for pellets and for wood.

[0038] Furthermore, the invention is valid both for air stoves and for hydro stoves (connected to the domestic heating system).

[0039] The wood and / or pellet stove or insert 4 comprises a main frame 8, fixed, which delimits a combustion chamber 12 and a brazier 16, which extend along a vertical direction Y-Y.

[0040] The wood and / or pellet stove or insert 4 comprises a front door 20 having a door frame 24 that supports a transparent plate 28, typically but not necessarily made of glass, adapted to allow viewing from the outside of the combustion chamber 12 and / or of the brazier 16.

[0041] The door frame 24 is movable from an opening position to a closing position; usually, the door frame 24 is hinged to the main frame 8 by means of one or more hinges 32 directed along said vertical direction Y-Y.

[0042] The wood and / or pellet stove or insert 4 comprises at least one combustion airflow propagation system 36, in fluid connection with the combustion chamber 12, configured to create said combustion airflow which comprises a primary airflow, a secondary airflow and a glass cleaning airflow 40.

[0043] The combustion airflow propagation system 36 may be of various types; for example, it may comprise at least one fumes fan 38.

[0044] Said fumes fan 38 may operate in suction and / or in delivery mode, drawing air from the external environment in which the wood and / or pellet stove or insert 4 is installed.

[0045] Alternatively and / or additionally, said combustion airflow propagation system 36 may comprise at least partially or entirely the natural draught of hot chimney fumes.

[0046] In other words, the natural draught of hot chimney fumes may be used to create at least partially or entirely said glass cleaning airflow 40.

[0047] The primary airflow passes through the brazier 16, for a first oxidation step of the wood and / or pellets and production of pyrolysis / gasification gases.

[0048] The secondary airflow is introduced into the combustion chamber 12, above the brazier 16, to complete the oxidation of the pyrolysis / gasification gases.

[0049] The glass cleaning airflow 40 is introduced in the combustion chamber 12 to prevent the particulate from settling on the transparent plate 28, in particular at an inner face 44 of the transparent plate 28.

[0050] Advantageously, the main frame 8 comprises a main duct 48 fluidically connected to the combustion airflow propagation system 36 so as to convey at least said glass cleaning airflow 40.

[0051] Furthermore, the door frame 24 comprises a plurality of cleaning ducts 52 fluidically connected with at least one conveying mouth 56 which, in the closed configuration of the front door 20, is facing and aligned with said main duct 48 of the main frame 8 so as to receive said at least one glass cleaning airflow 40 and to convey it to said cleaning ducts 52.

[0052] For example, the main duct 48 of the main frame 8 is arranged straddling a centreline plane M-M of the main frame 8, parallel to said vertical direction Y-Y.

[0053] For example, the main duct 48 extends along a transverse direction T-T, perpendicular to the vertical direction Y-Y so as to affect the entire transverse width of the front door 20.

[0054] Preferably, the main duct 48 is arranged on an upper side 60 of the main frame 8 and the conveying mouth 56 is arranged on a corresponding upper edge 64 of the door frame 24.

[0055] In accordance with one embodiment, the conveying mouth 56 extends along the entire transverse width of the door frame 24.

[0056] In accordance with one embodiment, the conveying mouth 56 of the main duct 48 is delimited by bulkheads 68 which, in the closing configuration of the front door 20, abut against peripheral gaskets 72 of the door frame 24, integral with the inner face 44 of the door frame 24.

[0057] The peripheral gaskets 72 of the door frame 24 are for example tubular-type gaskets that are at least partially compressed, that is, squeezed, when the front door 20 closes against the main frame 8. For example, at least the partial deformation of the peripheral gaskets 72 occurs following contact against the bulkheads 68 which delimit the conveying mouth 56, during the closing step of the front door 20. It is also possible to ensure that the bulkheads 68 are at least partially counter-shaped with respect to the peripheral gaskets 72, for example so as to embrace or surround them at least partially during the closing step of the front door 20. In this way, when the front door 20 is closed against the main frame 8, the main duct 48 is aligned with the conveying mouth 56 and a seal is created at the fluid connection between the main duct 48 and the conveying mouth 56. In general, the airtight seal between the bulkheads 68 and the peripheral gaskets 72 occurs following reciprocal contact with at least partial elastic deformation of the peripheral gaskets 72.

[0058] In accordance with one embodiment, the door frame 24 comprises a plurality of cleaning ducts 52 which follow a peripheral edge of the door frame 24 and which open into delivery mouths 76 facing the transparent plate 28, so as to direct on the transparent plate 28 a plurality of glass cleaning airflows 40 along vertical, transverse and / or oblique directions.

[0059] In accordance with one embodiment, the cleaning ducts 52 are delimited by flat fins 78 parallel to the transparent plate 28, so as to convey the glass cleaning airflow 40 parallel to the transparent plate 28.

[0060] In accordance with one embodiment, said flat fins 78 are arranged from an inner face 44 of the transparent plate 28 and define with the transparent plate 28 a meatus 80 having a thickness less than 3 mm.

[0061] As can be appreciated from the description, the above-described solutions make it possible to overcome the drawbacks of the prior art.

[0062] In particular, it is possible to achieve a calibrated air blade on all four sides of the door and not only in the upper part as occurs in the solutions of the prior art.

[0063] Furthermore, total control and calibration of the cross-section of the air passage between the sheet metal deflector and the surface of the transparent plate of the door is achieved: in fact, while in the solutions of the prior art this passage cross-section could be compromised by the positioning of the door, not always constant over time, relative to the structure of the equipment, thanks to the present invention, having moved the air outlet to the structure of the door itself, this dimension can be adjusted, that is, set to template, during bench assembly, thus ensuring that the cross-section and position remain unchanged over time.

[0064] The transparent plate therefore remains clean for a longer time compared to the solutions of the prior art.

[0065] Furthermore, greater cleaning of the transparent plate is also achieved at low operating powers of the wood and / or pellet stove and therefore with lower air flow rates.

[0066] Moreover, thanks to the present invention, it is possible to use a transparent plate up to three times larger compared to the prior art, particularly in its length profile.

[0067] The present invention applies to biomass combustion equipment with a transparent plate for viewing the flame.

[0068] In general, the invention is valid both for pellets and for wood.

[0069] Furthermore, the invention is valid both for air stoves and for hydro stoves (connected to the domestic heating system).

[0070] Moreover, the present invention may imply the presence of a fan acting on the combustion fumes.

[0071] Said fan may operate in suction of the combustion fumes, as occurs in some solutions of the prior art.

[0072] Alternatively, it is also possible to use air flow or air blade which i pushed, by means of a dedicated fan. Also in this case, the stove design would still be innovative, because it would also allow in this case to have a controlled and calibrated air blade compared to the prior art.

[0073] A skilled person in the field, in order to meet contingent and specific needs, may make numerous modifications and variations to the solutions described above.

[0074] The scope of protection of the invention is defined by the following claims.List of references

[0075] 4: wood and / or pellet stove or insert 8: main frame 12: combustion chamber 16: brazier 20: front door 24: door frame 28: transparent plate 32: hinge 36: combustion airflow propagation system 38: fumes fan 40: glass cleaning airflow 44: inner face 48: main duct 52: cleaning ducts 56: conveying mouth 60: upper side 64: upper edge 68: bulkheads 72: peripheral gaskets 76: delivery mouths 78: fins 80: meatus Y-Y: vertical direction T-T: transverse direction M-M: centreline plane

Claims

1. A wood and / or pellet stove or insert (4) comprising: - a fixed main frame (8), delimiting a combustion chamber (12) and a brazier (16), which extend along a vertical direction (Y-Y), - a front door (20) having a door frame (24) supporting a transparent plate (28) adapted to allow the combustion chamber (12) and / or the brazier (16) to be seen from the outside, said door frame (24) being movable from an opening position to a closing position, - at least one combustion airflow propagation system (36), in fluid connection with the combustion chamber (12), configured to create said combustion airflow comprising a primary airflow, a secondary airflow and a glass cleaning airflow (40), - wherein the primary airflow passes in the brazier (16), for a first oxidation step of the wood and / or pellets and production of pyrolysis / gasification gas, - wherein the secondary airflow is introduced in the combustion chamber (12), above the brazier (16), to complete the oxidation of the pyrolysis / gasification gases, - wherein the glass cleaning airflow (40) is introduced into the combustion chamber (12) to prevent the particulate from settling on the transparent plate (28), the main frame (8) has a main duct (48) fluidically connected with the combustion airflow propagation system (36) so as to convey at least said glass cleaning airflow (40), characterised in that the door frame (24) comprises a plurality of cleaning ducts (52) fluidically connected with a conveying mouth (56) which, in the closing configuration of the front door (20), is facing and aligned with said main duct (48) of the main frame (8) so as to receive said at least one glass cleaning airflow (40) and to convey it to said cleaning ducts (52), wherein the conveying mouth (56) of the main duct (48) is delimited by bulkheads (68) which, in the closing configuration of the front door (20), abut against peripheral gaskets (72) of the door frame (24), integral with the inner face (44) of the door frame (24).

2. A wood and / or pellet stove or insert (4) according to claim 1, wherein the bulkheads (68) and the peripheral gaskets (72) are shaped so as to cause a partial elastic deformation of the peripheral gaskets (72) following reciprocal contact, so as to ensure sealing.

3. A wood and / or pellet stove or insert (4) according to claim 1 or 2, wherein said bulkheads (68) are at least partially counter-shaped with respect to the peripheral gaskets (72) so as to embrace or surround them at least partially during the closing step of the front door (20).

4. A wood and / or pellet stove or insert (4) according to claim 1, 2 or 3, wherein the combustion airflow propagation system (36) comprises at least one fumes fan (38) .

5. A wood and / or pellet stove or insert (4) according to claim 4, wherein said fumes fan (38) operates in suction and / or in delivery mode, drawing air from the external environment in which the wood and / or pellet stove or insert (4) is installed.

6. A wood and / or pellet stove or insert (4) according to claim 1, 2, 3, 4 or 5, wherein said combustion airflow propagation system (36) comprises at least partially or entirely the natural draught of hot chimney fumes.

7. A wood and / or pellet stove or insert (4) according to any one of claims 1 to 6, wherein the main duct (48) is arranged straddling a centreline plane (M-M) of the main frame (8), parallel to said vertical direction (Y-Y).

8. A wood and / or pellet stove or insert (4) according to claim 7, wherein the main duct (48) extends along a transverse direction (T-T), perpendicular to the vertical direction (Y-Y) so as to affect the entire transverse width of the front door (20).

9. A wood and / or pellet stove or insert (4) according to any one of claims 1 to 8, wherein the main duct (48) is arranged on an upper side (60) of the main frame (8) and wherein the conveying mouth (56) is arranged on a corresponding upper edge (64) of the door frame (24).

10. A wood and / or pellet stove or insert (4) according to any one of claims 1 to 9, wherein the conveying mouth (56) extends along the entire transverse width of the door frame (24).

11. A wood and / or pellet stove or insert (4) according to any one of claims 1 to 10, wherein the door frame (24) comprises a plurality of cleaning ducts (52) which follow a peripheral edge of the door frame (24) and which open into delivery mouths (76) facing the transparent plate (28), so as to direct on the transparent plate (28) a plurality of glass cleaning airflows (40) along vertical, transverse and / or oblique directions.

12. A wood and / or pellet stove or insert (4) according to claim 11, wherein the cleaning ducts (52) are delimited by flat fins (78) parallel to the transparent plate (28), so as to convey the glass cleaning airflow (40) parallel to the transparent plate (28).

13. A wood and / or pellet stove or insert (4) according to claim 12, wherein said flat fins (78) are arranged from an inner face (44) of the transparent plate (28) and define with the transparent plate (28) a meatus (80) having a thickness less than 3 mm.

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