EP1589285A2 - Verbrennungsluft-Absperrvorrichtung in einem Ofen für Brennstoffpellets - Google Patents

Verbrennungsluft-Absperrvorrichtung in einem Ofen für Brennstoffpellets Download PDF

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Publication number
EP1589285A2
EP1589285A2 EP05075648A EP05075648A EP1589285A2 EP 1589285 A2 EP1589285 A2 EP 1589285A2 EP 05075648 A EP05075648 A EP 05075648A EP 05075648 A EP05075648 A EP 05075648A EP 1589285 A2 EP1589285 A2 EP 1589285A2
Authority
EP
European Patent Office
Prior art keywords
box
shaped body
cut
combustion air
electromagnet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05075648A
Other languages
English (en)
French (fr)
Other versions
EP1589285A3 (de
Inventor
Giacomo MCZ S.p.A. Zanette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MCZ SpA
Original Assignee
MCZ SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MCZ SpA filed Critical MCZ SpA
Publication of EP1589285A2 publication Critical patent/EP1589285A2/de
Publication of EP1589285A3 publication Critical patent/EP1589285A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/06—Construction of valves or dampers for controlling air supply or draught slidable only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/04—Fail safe for electrical power failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake

Definitions

  • the invention consists of an automatic safety device which is especially applicable to pellet stoves to cut off the flow of combustion air in the event of irregular and/or dangerous operating conditions.
  • This device is basically comprised of a box-shaped element in which a "guillotine" slides when activated by a special electromagnetic actuator attached by a suitable solid support to the box-shaped element itself. This entire assembly is then placed between the combustion air inlet opening and its supply duct to the relative combustion chamber.
  • Pellet stoves and their operation are commonly known. Therefore, for further clarity, a brief description will be provided hereunder of the basic composition of a pellet stove in order to better understand the application of the invention.
  • a pellet stove is normally composed of an outer cabinet which contains the basic operating parts. Furthermore, in its upper part, there is a hopper tank where the pellets are loaded. This tank opens onto a screw feeder for the pellets, which causes the pellets to drop through a duct into a suitable grate.
  • the air required for combustion is normally aspirated from the surroundings where the stove is located.
  • Aspiration in basic types of stoves takes place by means of natural draught produced by the flue pipe for the removal of gases produced by combustion. In more recent types which are now normally used, aspiration is produced by a forced draught produced by a special aspirator provided for this purpose.
  • pellet stoves are hence normally produced in such a manner as to comply completely with all current safety standards. Furthermore, in some cases they are manufactured with means and devices which even make it possible to be ahead of and in excess of that which is set forth by said regulations. In fact, at times it happens that an expert and alert designer realizes that those regulations are not sufficient to ensure safe and regular operation of the pellet stoves. The designer therefore takes actions to improve their features, above and beyond what is set forth in current regulations, often developing solutions which become the reference point for future manufacturing regulations and directives.
  • existing pellet stoves are equipped with electronic devices to constantly control and adjust various operating values such as room temperature, recycled air temperature in the room, released smoke temperature, and so on, and especially the amount of fuel and combustion air based on preset operating parameters and to halt combustion automatically in any of a number of possible cases of malfunction, thus placing the stove in safe operating conditions at all times.
  • the stove may, in a remotely possible and highly unfortunate event, operate improperly, causing not only an irregular flow of combustion gases but also damaging the stove itself due to overheating.
  • the generic pellet stove here synthetically represented, is composed of an outer cabinet indicated by the perimeter line 21 in the upper part of which a hopper tank 22 is located which contains the fuel consisting of pellets.
  • the pellets enter the feeder screw 23 which is activated by a reduction gear 24 which places the pellets, by means of a special duct 25, into the grate 26.
  • This grate 26 is located on the lower part of a combustion chamber 27 and above a supply chamber 28 for secondary combustion air.
  • the combustion chamber 27 in its upper part opens into the vertical duct 29 which at its lower end opens into the aspiration chamber 30 where a special aspirator composed of a suitable fan 31 activated by the relative electric motor 32 aspirates the gases which develop during combustion of the pellets, causing them to flow out the discharge duct 6 in the flue pipe (not shown).
  • the aforementioned fan 31, along with removing the combustion gases, generates negative pressure in the combustion chamber which in turn causes aspiration, through supply duct 5, of the air required for combustion which will be divided into two parts, specifically, one part referred to as primary which directly feeds the grate 26, and another part referred to as secondary which surrounds it externally.
  • This device D is composed of a box-shaped body 10 which is basically of a parallelepiped shape obtained from suitable sheet metal.
  • This box-shaped body 10 includes two equal main rectangular sides 11a and 11b which are parallel to each other. They are mutually connected on the perimeters by relative perimeter sides 12a, 12b, 12c, 12d and specifically by an upper side 12a, a lower side 12b and two lateral sides 12c and 12d which of course are all rectangular and of the same width.
  • this width will be roughly equal to the diameters of sections 51 and 52 of supply duct 5.
  • the two main rectangular sides 11a and 11b have a width which is substantially greater than their height, which in turn is opportunely greater than the diameter of the combustion air supply duct which is globally referred to in figure I with reference 5. More specifically, since the cut-off device D is inserted in supply duct 5, the upstream segment, that is, the segment where combustion air enters, and the downstream segment, that is, the segment which supplies the grate 26 of the stove S, as previously mentioned, are referred to respectively as 51 and 52.
  • the main rectangular sides 11a and 11b will also both be provided in the centres with respective circular openings with diameters that are equal to those of the relative sections 51 and 52of the supply duct 5 which, as can clearly be seen, have their respective ends connected to the circumferential edges of the aforementioned circular openings.
  • the box-shaped body 10 In the upper side 12a of the box-shaped body 10, there is a slot 121 placed parallel to its greater sides and equidistant from them, and which extend along the entire face 12a.
  • the slot 121 has a width which is only slightly greater than the thickness of the metal plate 131 thus forming, as described hereunder, the cut-off device 13 for the flow of air passing though the device D. This is obviously to allow the metal plate 131 to slide freely in it (121).
  • the cut-off element 13 is composed of a metallic plate 131 with a rectangular shape whose width is equal to the distance between the internal surfaces of the two lateral sides 12c and 12d of the box-shaped body 10, between which it must be able to slide at a height which, for the reasons that will be explained hereunder, will be greater than the distance between the opposing perimeter sides, upper 12a and lower 12b of the box-shaped element 10.
  • the support element 14 which can also be made from common sheet metal, is composed of a vertical section 141 with a "C" shape. From the upper end of this protrudes at a right angle an opportune rectangular section 142 which in its centre has a hole though it 143 to allow passage of a screw 144 which is screwed into the upper end of the electromagnet 15 thus securing it.
  • the pellet stove S is normally equipped with a special electronic device commonly referred to as a card, which constantly monitors the various operating parameters of the stove S so as to compare them with the set parameters and thus control the various operational parts (pellet feed screw, smoke aspirator, air recycling fan, etc.) as well as checking the operating conditions, detecting any defects and above all any malfunctions.
  • a card which constantly monitors the various operating parameters of the stove S so as to compare them with the set parameters and thus control the various operational parts (pellet feed screw, smoke aspirator, air recycling fan, etc.) as well as checking the operating conditions, detecting any defects and above all any malfunctions.
  • the events which may create problems that can be avoided through the application of the device referred to herein are basically a complete interruption of electrical power, which may be caused by a power outage, by activation of home safety switches, by safety fuses, by interruption in wiring, the mechanical or electrical failure of the electric motor of the smoke aspirator and finally any obstructions in the flue pipe or smoke discharge duct.
  • combustion in the stove may continue for a significant amount of time, and in some cases it may even continue in extremely hazardous conditions because, as also was previously stated, combustion which takes place with a reduced flow of oxygen as in this case generates combustion gases with a high content of carbon monoxide and carbon dioxide.
  • These gases may flow from the combustion air aspiration duct as well as from cracks and/or very small openings, thus penetrating into the living area where obviously they may create grave and in any case substantial hazards.
  • the card provides for power to the electromagnet 15 which is therefore energized and causes the cut-off element 13 to be opened. If on the other hand for one of the various aforementioned causes electrical power is interrupted to stove S and hence to the electromagnet 15, or if the card detects an operating malfunction (shutdown due to mechanical and/or electrical reasons of the smoke aspirator, even partial stoppage of smoke release, etc.) thus cutting off the power supply to the electromagnet 15, it (15) will no longer be energized and hence the spring 16 will push the cut-off element to the bottom of the box-shaped body 10 thus causing the flow of combustion air to be cut off.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Fuel Combustion (AREA)
  • Air Supply (AREA)
EP05075648A 2004-03-18 2005-03-17 Verbrennungsluft-Absperrvorrichtung in einem Ofen für Brennstoffpellets Withdrawn EP1589285A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000019A ITPN20040019A1 (it) 2004-03-18 2004-03-18 Dispositivo automatico di intercettazione dall'aria comburente in stufe a "pellets"
ITPN20040019 2004-03-18

Publications (2)

Publication Number Publication Date
EP1589285A2 true EP1589285A2 (de) 2005-10-26
EP1589285A3 EP1589285A3 (de) 2007-01-10

Family

ID=34938102

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05075648A Withdrawn EP1589285A3 (de) 2004-03-18 2005-03-17 Verbrennungsluft-Absperrvorrichtung in einem Ofen für Brennstoffpellets

Country Status (2)

Country Link
EP (1) EP1589285A3 (de)
IT (1) ITPN20040019A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1026708B1 (fr) * 2018-10-16 2020-05-19 New Bodart & Gonay Mécanisme d'admission d'air dans la chambre de combustion d'un brûleur pour combustible solide à tirage naturel

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884222A (en) * 1957-01-10 1959-04-28 William E Oakes Engine air cut-off device
GB929192A (en) * 1960-12-05 1963-06-19 Cammell Laird & Company Shipbu Improvements in or relating to valves for controlling the flow of steam, air, gases,or other fluids
FR2080578A6 (de) * 1970-02-18 1971-11-19 Kaimeier & Sohn Kg W
FR2444897A1 (fr) * 1978-12-21 1980-07-18 Sarret Marius Chaudiere de chauffage central fonctionnant notamment au bois
DE2944361A1 (de) * 1979-11-02 1981-05-14 Gerhard 6056 Heusenstamm Böttcher Absperrschieber mit belueftung des abgasrohres
GB2109918A (en) * 1981-09-14 1983-06-08 Kendrick Harry Mcintire Wood burning stove with safety shutdown mechanism
DK9700348U3 (da) * 1997-09-23 1997-12-29 Greenfire Aps Stokerbrændeovn til træpiller
US6273053B1 (en) * 2000-03-03 2001-08-14 Jkkb Holdings Corp. Engine shutdown valves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1026708B1 (fr) * 2018-10-16 2020-05-19 New Bodart & Gonay Mécanisme d'admission d'air dans la chambre de combustion d'un brûleur pour combustible solide à tirage naturel
EP3674607A1 (de) * 2018-10-16 2020-07-01 New Bodart & Gonay Mechanismus zur luftzufuhr in die brennkammer eines brenners für festbrennstoff mit natürlichem zug

Also Published As

Publication number Publication date
ITPN20040019A1 (it) 2004-06-18
EP1589285A3 (de) 2007-01-10

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