EP0797047A1 - Perfected burner for heat generator - Google Patents
Perfected burner for heat generator Download PDFInfo
- Publication number
- EP0797047A1 EP0797047A1 EP97104380A EP97104380A EP0797047A1 EP 0797047 A1 EP0797047 A1 EP 0797047A1 EP 97104380 A EP97104380 A EP 97104380A EP 97104380 A EP97104380 A EP 97104380A EP 0797047 A1 EP0797047 A1 EP 0797047A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- burner
- propellor
- area
- pipe
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 claims abstract description 29
- 238000002485 combustion reaction Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 claims 2
- 238000012423 maintenance Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001595 flow curve Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000001944 accentuation Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/001—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space spraying nozzle combined with forced draft fan in one unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
- F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
Abstract
Description
- This invention concerns a perfected burner for heat generator as set forth in the main claim.
- The perfected burner according to the invention is applied to heating systems substantially for domestic use either inside or immediately outside the room to be heated.
- The burner according to the invention can also be applied in cooperation with heating systems of a certain size to heat halls, gymnasiums, warehouses etc.
- The burner according to the invention may be of the type which uses liquid fuel, such as oil, or gas fuel.
- The need to obtain heat generators is known, particularly for domestic use or similar, which have all the characteristics of safety, simplicity of use and adjustment, high efficiency, ease and speed of installation and/or maintenance.
- It is also known that there are problems in the state of the art when the user needs to get to the heat generator to carry out even the simplest adjustments and overhauls.
- In some cases in the state of the art, some characteristics have been favoured over others when it was not possible to reach a compromise between the various needs.
- There are for example some burners known to the state of the art which are difficult to install and/or maintain quickly because the designers tried to make them more compact and to reduce the space they occupy. For the same reason, it is not always simple to carry out the necessary adjustments for a correct functioning.
- In other cases, in the attempt to achieve high efficiency and reduced consumption, bulky and unfunctional burners have been designed.
- Often, in order to put together as many functional characteristics as possible, burners have been made which are suitable only for one type of heat generator and therefore cannot be adapted for generators which have a combustion chamber of a different type.
- Another serious problem which is found in burners known to the state of the art, particularly in those which use blown air, is that of the pulsations at the beginning caused by the sudden overpressure which occurs at the moment of lighting.
- That may cause the flame to be extinguished and therefore it becomes necessary to repeat the lighting procedure several times or even, in the worst case, a blow-back of the flame, with extremely dangerous consequences for the user.
- Moreover, these initial pulsations often cause the exhaust gases to leak from the combustion chamber.
- This problem is partially resolved, in the state of the art, by increasing the dimensions of the burners and thus creating problems in the size and compactness of the structure of the heat generator itself.
- In particular, some solutions known to the state of the art conform the air inlet to the ventilator in a suitable way, but this in any case causes an increase in the total size.
- DE-C-4232178 teaches to use a ventilator system which obtains at least a partial recircling of the air propelled by the air propellor, in order to increase the prevalence of the air and thus limit any excessive pressure at the moment of ignition.
- In this document, however, given the reciprocal positioning of the propellor and the chassis of the ventilator, only a very limited quantity of air is subject to a recircling action, and therefore the increase in the steepness of the prevalence/flow curve is very limited.
- Moreover, this document does not include the body of the motor inside the ventilator, nor does it allow the motor to be included therein, and this causes an enormous increase in the axial bulk of the heat generator in its entirety.
- FR-A-2212864 discloses a ventilator structure to feed a burner where the flame pipe is entirely associated with the chassis of the ventilator, which makes it impossible to perform any kind of adjustment and positioning without modifying the overall bulk of the heat generator.
- Moreover, it is substantially impossible to perform any kind of maintenance work and/or replacement of internal parts without dismantling the entire structure, and this can only be performed by the appropriately authorised and specialised staff.
- The present applicants have designed, tested and embodied this invention to overcome the shortcomings of the state of the art and to realise a simplified burner, of compact size, extremely functional in its installation, its maintenance and its adjustments, as well as to achieve further advantages.
- This invention is set forth and characterised in the main claim, while the dependent claims describe variants of the idea of the main embodiment.
- The purpose of this invention is to obtain a simple burner, easy to install, adjust and maintain, which gives a high operating efficiency while maximizing safety and minimizing the size.
- The perfected burner according to the invention has a structure which allows the combustion chamber to be connected with a heat generator without any limits of form or configuration of the combustion chamber itself.
- The various parts of the burner are connected by means of attaching elements which also act as elements to adjust the burner easily and in a way which is immediately accessible from outside, even for someone of no specific skill in the art, thus assisting and accelerating assembly operations and any necessary work on the internal components or parts.
- By means of these adjustment elements it is possible to adjust with extreme precision the functioning parameters of the burner, guaranteeing extreme versatility and flexibility of the whole plant which can be adapted to different applications and vary its operating conditions according to necessity.
- Moreover, the type of connection between the various components according to the invention guarantees an airtight seal between the inside and outside of the burner.
- The burner according to the invention comprises a chassis of such a shape as to guarantee, in an extremely limited space, both the support and/or containment of the various components, and also a flow of air suitable for an efficient and complete combustion and an efficient discharge of the fumes.
- The chassis, or containing structure, is equipped with attachment means to attach it to the outer wall of the combustion chamber associated with the burner.
- The chassis defines an inner seating where the flame pipe is inserted, and the front end of the flame pipe faces inside the combustion chamber.
- Inside the flame pipe, advantageously in a coaxial position with the pipe, there is the fuel feed pipe, connected outside to the fuel feed means.
- The rear, or outer, end of the flame pipe is associated with a cover element by means of which the flame pipe is attached to the chassis of the burner.
- According to the invention, the connection between the cover element and the chassis can be adjusted from the outside by means of screws, in cooperation with at least one replaceable spacer element.
- This makes it possible to move the flame pipe axially so that its front end protrudes more or less inside the combustion chamber.
- This adjustment makes it possible to adapt the flame of the burner to the different configurations of the combustion chamber and the different types of heat generator to which the burner is applied.
- The fuel feed pipe, which is inside the flame pipe, has a nozzle conformation in correspondence with its front end outlet.
- In front of this nozzle there is a disk element, the function of which is to make the comburent air fed to the burner turbulent, and therefore to optimize the mixture with the fuel given by the fuel feed pipe to the nozzle.
- According to the invention, by acting on an adjustment accessible from the outside, the fuel feed pipe can be made to run axially to the flame pipe.
- This adjustment is advantageously screw-type, and is arranged on the cover element associated with the rear end of the flame pipe.
- By varying the reciprocal position between the turbulence disk and the front end of the flame pipe outlet, the adjustment makes it possible to vary the turbulence of the flow of comburent air and therefore to vary the mixture of comburent material and combustible material.
- By adjusting the axial position of the fuel pipe, it is also possible to vary the position of the air shutter which regulates the flow of comburent air fed to the burner.
- According to the invention, the position of this shutter, which is placed downstream of the air intake propellor, can be adjusted autonomously and independently of the position of the fuel feed pipe by acting on specific adjustment means accessible from outside.
- In the preferred embodiment of the invention, the adjustment means for the position of the shutter are screw-type too, and are arranged on the cover element.
- This double adjustment makes it possible to optimize the combustion in an extremely precise way and therefore both to reduce consumption and to adapt the functioning of the heat generator to the specific requirements.
- The whole adjustment unit is easily removable for checking and maintenance inside the burner, even without removing the burner itself from the wall of the combustion chamber.
- Since the whole adjustment system is on the flame pipe, rather than on the air inlet opening on the chassis, the air inlet area, in the burner according to the invention, can be put in a pipe and therefore the initial intake point can be placed at a considerable distance from the burner.
- One possible case is that an air intake point is placed outside the building where the heat generator is found.
- This allows a balanced flow of air to be achieved and thus guarantees greater safety and comfort; moreover, it is possible to install auxiliary devices, such as filters or silencers, on the pipes which feed the air to the burner.
- According to the invention, the air propellor which feeds the comburent air to the burner acts as a housing for the motor of the ventilator, which considerably reduces the space occupied.
- Moreover, the conformation of the air propellor and the motor is such as to guarantee at least a partial recircling of the air aspired for combustion, which causes on one side an increase in the prevalence of the air, or rather the vertical height to which the air can be lifted, and on the other side an accentuation of the steepness in the prevalence/flow curve.
- By obtaining a high steepness in this curve, it is possible to combat efficiently the high pressures which occur at the moment of ignition, and thus to limit significantly the problems connected with these pressures, including the leakage of exhaust gas from the combustion chamber.
- According to the invention, this partial recircling of the aspirated air is obtained by allowing the air which has not entered the flame pipe to circle outside the flame pipe and then move near the air propellor again.
- This recircled air, which is already under pressure, Is directed along a peripheral zone of the propellor, and then later picked up by the propellor itself, from which it receives new energy.
- The new air, aspired through the opening in the body of the burner, is attracted both by the normal depression determined by the action of the propellor and by the induction effect generated by the flow of air under pressure generated by the recircling air thus obtained.
- The attached figures are given as a non-restrictive example and show a preferred embodiment of the invention as follows:
- Fig. 1
- shows a longitudinal cross section of the perfected burner according to the invention;
- Fig. 2
- shows the diagram of a perfected burner according to the invention, with particular reference to the area of the ventilator;
- Fig. 3
- shows a cross section seen from A of the burner according to the invention;
- Fig. 4
- shows the flow/prevalence curve of the flow of air given by the ventilator of a state of the art burner and the same curve obtained by a burner according to the invention.
- Fig. 1 shows the preferred embodiment of the
perfected burner 10 according to the invention. - The
burner 10 comprises achassis 11 which has at its lower end ahole 12 which allows for the installation of asuitable ventilator 13, which has anair propellor 40 and amotor 37, and defines theopening 15 for the flow of air, indicated by 14. - The
chassis 11 is attached to the outer wall of thecombustion chamber 26, in this case, by means of a screw attachment element. - In the upper part of the
chassis 11 there is a throughhole 16 into which theflame pipe 17 is inserted in such a way that its forward end, atruncated cone 17a, is substantially placed inside thecombustion chamber 26. - The rear end of the
flame pipe 17 is associated with acover element 18 by means of a solid connection by theattachment element 24. - Between the
cover element 18 and theflame pipe 17 there are holdingelements 19, in this case an O-ring packing, which make theflame pipe 17 airtight with the outside. - In this case, the holding
elements 19 are inside arelative channel 20 which follows the perimeter edge of thecover element 18. - In this case, the
cover element 18 is attached to thechassis 11 of the burner by means of a screw-type attachment element. - Between the
attachment element 25 and thechassis 11 there is aspacer element 28 which can be replaced or modified. - The
attachment element 25, cooperating with thespacer element 28, makes it possible to adjust the axial position of theflame pipe 17 inside thechassis 11 and, therefore, the position of theforward end 17a with respect to thecombustion chamber 26 with which theburner 10 is associated. - The length of the
spacer element 28 can be adapted according to requirements, or replaced. - By varying the position of the
forward end 17a of theflame pipe 17 with respect to thecombustion chamber 26, it is possible to adapt the flame of theburner 10 to the various forms and dimensions of thecombustion chamber 26 and the different applications, such as boiler, hot air generators, etc., which can be used with theburner 10. - The
cover element 18 has ahole 21, in this case situated on the axis, inside which there is thefuel feed pipe 22. - On the outside too, in cooperation with the
hole 21 there is achannel 20 in which an O-type packing is inserted. - On the outside the
fuel feed pipe 22 has anattachment 38 to the conventional fuel feeding means, whether they be liquid or gas. - The
fuel feed pipe 22, contained in theflame pipe 17, can be made to run axially through thehole 21. - The axial position of the
fuel feed pipe 22 in theflame pipe 17 can be adjusted, in this case, by acting on a screw-type attachment andadjustment element 23. Thiselement 23 is solid with thefuel feed pipe 22 and its position can be adjusted with respect to thecover element 18. - By acting on the attachment and
adjustment element 23, thefuel feed pipe 22 is moved backwards or forwards axially inside theflame pipe 17. - The axial movement of the
fuel feed pipe 22 is assisted, in this case, by arunner element 29, of a shape mating with the inner section of theflame pipe 17, which is also used to support and guide thefuel feed pipe 22. - The
fuel feed pipe 22 has at its ends nozzle-type outlet means 30 in front of which there is aturbulence disk 31. - In this way, by moving one way or the other the
fuel feed pipe 22 with respect to theflame pipe 17, it is possible to vary the turbulence of the comburent air fed into the combustion area, and therefore it is possible to vary the combustion itself. - The rear or outer end of the
fuel feed pipe 22 is associated with aremovable plug 32 where a device to pre-heat the fuel could possibly be housed. - The
flame pipe 17, in that part of its surface contained inside thechassis 11 and facing theventilator 13, has aslit 33 through which the air fed by theventilator 13 passes. - The section of this slit 33 through which the air passes is determined by the position of an
air shutter 34 contained inside theflame pipe 17 and positioned, in this case, downstream of theventilator unit 13. - The position of the
air shutter 34 can be adjusted independently of theflame pipe 17 by acting on the appropriate screw-type adjustment element 35, arranged on thecover element 18, of which the activating mechanism is accessible from the outside. - In this way, the flow of air fed to the combustion area at the outlet of the
fuel feed pipe 22 can be adjusted in an extremely quick and simple way to vary the combustion. - By dismantling the
cover element 18, which can be done extremely easily even by non-specialist users, it is possible to accede to the inside of theburner 10 very quickly, to check it or for maintenance. - Figure 2 shows a partial drawing of the perfected
burner 10 according to the invention. - In this Figure, it can be seen how the space occupied is very small as the
motor 37 of theventilator 13 is substantially housed in the space defined by theair propellor 40 itself. - The
motor 37 is attached to thechassis 11 by means of aflange 53. - In this way, most of the
motor 37 is contained inside the space taken up by thechassis 11, and, in this case, only thepump 39 remains outside this space. - In the perfected
burner 10, moreover, theopening 15 for the flow ofair 14 is on the same side as themotor 37 and this gives a further reduction in the overall space occupied. - Figure 3 shows a cross section seen from A of the perfected
burner 10 according to the invention. - In this case, on the outer surface of the
motor 37 there are two fins in a diametric position: upperlongitudinal fin 41 and lowerlongitudinal fin 42. In cooperation with the inner surface of thepropellor 40, thesefins upper intake area 43 and alower intake area 44. - The
chassis 11, on its lower part, defines anarea 48 where the air passes through. Thisarea 48 widens progressively from its initial area until it reaches a width equal to at least 30% of the width of thepropellor 40 in the area substantially diametric to the initial area. - The flow of
air 14 aspired from the outside through theopening 15 is pushed by theair propellor 40 towards theslit 35 of theflame pipe 17. - This flow of air is conveyed through a
space 54 which communicates with theslit 33, thespace 54 being between the head of theair propellor 40 and the inner wall of thechassis 11 which is placed on the side of theflange 53 which mounts themotor 37. - In this case, the head of the
propellor 40 is closed by ascreen 55 which prevents air entering. - In this case, the width of the
area 48, together with the rounded conformation of the inner surface of thechassis 11, causes part of the air, indicated by 49, to enter therecircling conduit 45 which is placed around theflame pipe 17, rather than entering directly theflame pipe 17 itself through theslit 33. - From the
recircling conduit 45 the recircled air, which already has a certain pressure, is aspired downwards through theconveyor space 54, as it is prevented from entering theslit 33 by thedeflector element 46. - The
deflector element 46 is attached to thechassis 11 on the inner side from where theflange 53 is positioned and extends substantially on a horizontal plane to cover approximately the width of thepropellor 40. - The recircled air, indicated by the
arrows 50, is confined in theupper intake area 43 by thediametric fins deflector element 46. From here it is forced by thepropellor 40 into the sickle-shapedtangential area 47 between thepropellor 40 and thechassis 11, acquiring new energy from thepropellor 40. - The
tangential area 47 grows progressively wider towards the bottom and is found substantially at the same axial height as theair propellor 40. - The recircled air, indicated by 51, mixes with the flow of new air, indicated by 52, aspired by the
air propellor 40 itself through theopening 15, which is found substantially in correspondence with the end of thetangential area 47. - According to this configuration, the new air is therefore aspired by the double depression created by the
air propellor 40 and the induction effect determined by the flow of recircled air fed through theupper intake area 43 and the sickle-shapedtangential area 47. - This makes it possible to modify the characteristics of the air sent to the
flame pipe 17 in terms of flow/prevalence, as shown in the graph in Fig. 4. - The graph, where the flow expressed in cu.m. per hour is indicated in x-coordinate and the prevalence expressed in mm. using a column of water as a parameter of measurement is indicated in y-coordinate, gives a curve L which is obtained with a substantially conventional burner, and a curve L' which is obtained with the perfected
burner 10 according to the invention. - The greater steepness of the curve L' causes, when the system is working, a good compensation of the overpressures which occur during ignition and which cause the initial pulsations known to the state of the art.
- This guarantees a more efficient combustion and makes it possible to overcome efficiently the resistences which the fumes encounter in conventional burners as they leave the heat generator.
Claims (12)
- Perfected boiler for heat generator, which can be used in cooperation with heating plants such as boilers, hot air generators etc. for heating rooms in general, the burner comprising at least a containing structure (11) associated with the outer wall of a combustion chamber (26) and defining inside the seating for at least a flame pipe (17) and for a ventilator unit (13), the flame pipe (17) containing inside a fuel feed pipe (22) and having at its periphery a slit (33) through which the air passes associated with the ventilator unit (13), the ventilator unit (13) having an air propellor (40) carried by an actuating motor (37) supported by a mounting flange (53), the slit (33) cooperating with a shutter element (34), the fuel feed pipe (22) having at its end a nozzle outlet (30) cooperating with a turbulence disk (31), there also being an intake opening (15), the burner being characterised in that the containing structure (11) defines, laterally to the air propellor (40), an area (48) through which the air passes which increases progressively to a width equal to at least 30% of the diameter of the air propellor (40) in the area substantially diametric to its initial part, and around the flame pipe (17) an annular recircling conduit (45) which communicates at its inlet with that area (48), the burner also being characterised in that the air propellor (40) defines inside a housing space for at least part of the motor (37), between the motor (37) and the inner diameter of the air propellor (40) there being longitudinal fins (41, 42) substantially diametrically arranged and defining, together with the air propellor (40), a lower intake area (44) communicating wih the opening (15), and a higher intake area (43) communicating with the annular recircling conduit (45), between the air propellor (40) and the inner side of the containing structure (11) on the side of the flange (53) there being an annular space (54) to convey the air.
- Burner as in Claim 1, in which between the annular recircling conduit (45) and the upper intake area (43) there is a deflector element (46) which extends on a substantially horizontal plane as far as the proximity of the flame pipe (17) and the proximity of the slit (33) through which air passes, the deflector element (46) being solid with the inner side of the containing structure (11) on the part opposite the flange (53) and extending at a right angle as far as the width of the air propellor (40), between the air propellor (40) and the containing structure (11) there being a tangential area (47) which communicates at its upper end with the upper intake area (43) and at its lower end with the air intake opening (15).
- Burner as in Claim 2, in which the tangential area (47) is substantially at the same axial height as the air propellor (40), is sickle-shaped and becomes progressively wider towards the bottom.
- Burner as in any of the claims hereinbefore, in which the air propellor (40) has a screen (55) to close the annular space (54) which conveys the air.
- Burner as in any of the claims hereinbefore, in which the air intake opening (15) communicates with the lower intake area (44) and substantially begins at the lower longitudinal fin (42).
- Burner as in any of the claims hereinbefore, in which at least the axial position of the flame pipe (17) with respect to the combustion chamber (26) can be adjusted manually and independently of the other components of the burner (10).
- Burner as in Claim 6, in which the means to adjust the axial position of the flame pipe (17) are accessible from outside, at the front of the burner (10) and comprise at least screw-type adjustment means (25) and replaceable deflector means (28).
- Burner as in any of the claims hereinbefore, in which at least the axial position of the shutter (34) with respect to the flame pipe (17) can be adjusted manually and independently of the other components of the burner (10).
- Burner as in Claim 8, in which the means to adjust the axial position of the air shutter (34) are accessible from the outside at the front of the burner (10) and have at least screw-type adjustment means (35).
- Burner as in any of the claims hereinbefore, in which the adjustment means (25,28, 35) are anchored on a removable cover element (18) associated with the rear end of the flame pipe (17).
- Burner as in any of the claims hereinbefore, in which the insertion seating of the flame pipe (17) is defined by a hole (16) made in the cover element (18) and has means (19) to create an airtight seal at its periphery.
- Burner as in any of the claims hereinbefore, in which the insertion seating of the fuel feed pipe (22) is defined by a hole (21) made in the cover element (18) and has means (19) to create an airtight seal at its periphery.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUD960036 | 1996-03-22 | ||
IT96UD000036A IT1288866B1 (en) | 1996-03-22 | 1996-03-22 | PERFECTED BURNER FOR HEAT GENERATOR |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0797047A1 true EP0797047A1 (en) | 1997-09-24 |
EP0797047B1 EP0797047B1 (en) | 2001-09-19 |
Family
ID=11422052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97104380A Expired - Lifetime EP0797047B1 (en) | 1996-03-22 | 1997-03-14 | Perfected burner for heat generator |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0797047B1 (en) |
AT (1) | ATE205930T1 (en) |
DE (1) | DE69706731T2 (en) |
ES (1) | ES2163677T3 (en) |
IT (1) | IT1288866B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2282117A3 (en) * | 2009-08-07 | 2012-10-17 | Dome Holding GmbH | Connection channel |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1573999A (en) * | 1967-03-31 | 1969-07-11 | ||
FR2211106A5 (en) * | 1972-12-20 | 1974-07-12 | Fritsche Heinrich | |
FR2212864A5 (en) * | 1972-12-29 | 1974-07-26 | Chauffage Automatique | |
WO1984001809A1 (en) * | 1982-10-29 | 1984-05-10 | Vaillant Joh Gmbh & Co | Burner supplied with fluid fuel |
EP0295157A1 (en) * | 1987-05-20 | 1988-12-14 | Airelec Industries | Air distributing device for forced draught operated burner |
DE9303936U1 (en) * | 1993-03-17 | 1993-05-19 | Koerting Hannover Ag, 3000 Hannover, De | |
DE4232178C1 (en) * | 1992-09-25 | 1993-12-23 | Siegfried W Schilling | Radial blower |
-
1996
- 1996-03-22 IT IT96UD000036A patent/IT1288866B1/en active IP Right Grant
-
1997
- 1997-03-14 EP EP97104380A patent/EP0797047B1/en not_active Expired - Lifetime
- 1997-03-14 AT AT97104380T patent/ATE205930T1/en not_active IP Right Cessation
- 1997-03-14 DE DE69706731T patent/DE69706731T2/en not_active Expired - Fee Related
- 1997-03-14 ES ES97104380T patent/ES2163677T3/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1573999A (en) * | 1967-03-31 | 1969-07-11 | ||
FR2211106A5 (en) * | 1972-12-20 | 1974-07-12 | Fritsche Heinrich | |
FR2212864A5 (en) * | 1972-12-29 | 1974-07-26 | Chauffage Automatique | |
WO1984001809A1 (en) * | 1982-10-29 | 1984-05-10 | Vaillant Joh Gmbh & Co | Burner supplied with fluid fuel |
EP0295157A1 (en) * | 1987-05-20 | 1988-12-14 | Airelec Industries | Air distributing device for forced draught operated burner |
DE4232178C1 (en) * | 1992-09-25 | 1993-12-23 | Siegfried W Schilling | Radial blower |
DE9303936U1 (en) * | 1993-03-17 | 1993-05-19 | Koerting Hannover Ag, 3000 Hannover, De |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2282117A3 (en) * | 2009-08-07 | 2012-10-17 | Dome Holding GmbH | Connection channel |
US8882491B2 (en) | 2009-08-07 | 2014-11-11 | Dome Holding Gmbh | Connection duct |
Also Published As
Publication number | Publication date |
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ATE205930T1 (en) | 2001-10-15 |
ITUD960036A1 (en) | 1997-09-22 |
EP0797047B1 (en) | 2001-09-19 |
IT1288866B1 (en) | 1998-09-25 |
ES2163677T3 (en) | 2002-02-01 |
DE69706731D1 (en) | 2001-10-25 |
DE69706731T2 (en) | 2002-05-08 |
ITUD960036A0 (en) | 1996-03-22 |
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