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

Definitions

• 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.
• 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.
• 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.
• 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-2 211 106 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.
• 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 invention concerns a perfected burner for a heat generator as defined in claim 1.
• 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.
• the type of connection between the various components of the burner guarantees an airtight seal between the inside and outside of the burner.
• the burner further 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.
• 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.
• 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 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.
• a disk element 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.
• 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.
• 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.
• 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.
• the adjustment means for the position of the shutter are screw-type too, and are arranged on the cover element.
• 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.
• 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.
• 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.
• 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.
• 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.
• Fig. 1 shows the preferred embodiment of the perfected burner 10 according to the invention.
• the burner 10 comprises a chassis 11 which has at its lower end a hole 12 which allows for the installation of a suitable ventilator 13, which has an air propellor 40 and a motor 37, and defines the opening 15 for the flow of air, indicated by 14.
• the chassis 11 is attached to the outer wall of the combustion chamber 26, in this case, by means of a screw attachment element.
• the rear end of the flame pipe 17 is associated with a cover element 18 by means of a solid connection by the attachment element 24.
• the holding elements 19 are inside a relative channel 20 which follows the perimeter edge of the cover element 18.
• the cover element 18 is attached to the chassis 11 of the burner by means of a screw-type attachment element.
• a spacer element 28 which can be replaced or modified.
• the attachment element 25, cooperating with the spacer element 28, makes it possible to adjust the axial position of the flame pipe 17 inside the chassis 11 and, therefore, the position of the forward end 17a with respect to the combustion chamber 26 with which the burner 10 is associated.
• the length of the spacer element 28 can be adapted according to requirements, or replaced.
• the cover element 18 has a hole 21, in this case situated on the axis, inside which there is the fuel feed pipe 22.
• the fuel feed pipe 22 On the outside the fuel feed pipe 22 has an attachment 38 to the conventional fuel feeding means, whether they be liquid or gas.
• the fuel feed pipe 22, contained in the flame pipe 17, can be made to run axially through the hole 21.
• the axial position of the fuel feed pipe 22 in the flame pipe 17 can be adjusted, in this case, by acting on a screw-type attachment and adjustment element 23.
• This element 23 is solid with the fuel feed pipe 22 and its position can be adjusted with respect to the cover element 18.
• the fuel feed pipe 22 is moved backwards or forwards axially inside the flame pipe 17.
• the axial movement of the fuel feed pipe 22 is assisted, in this case, by a runner element 29, of a shape mating with the inner section of the flame pipe 17, which is also used to support and guide the fuel feed pipe 22.
• the fuel feed pipe 22 has at its ends nozzle-type outlet means 30 in front of which there is a turbulence disk 31.
• the rear or outer end of the fuel feed pipe 22 is associated with a removable plug 32 where a device to preheat the fuel could possibly be housed.
• the flame pipe 17, in that part of its surface contained inside the chassis 11 and facing the ventilator 13, has a slit 33 through which the air fed by the ventilator 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 the flame pipe 17 and positioned, in this case, downstream of the ventilator unit 13.
• the position of the air shutter 34 can be adjusted independently of the flame pipe 17 by acting on the appropriate screw-type adjustment element 35, arranged on the cover element 18, of which the activating mechanism is accessible from the outside.
• Figure 2 shows a partial drawing of the perfected burner 10 according to the invention.
• the motor 37 is attached to the chassis 11 by means of a flange 53.
• the opening 15 for the flow of air 14 is on the same side as the motor 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.
• upper longitudinal fin 41 and lower longitudinal fin 42 In cooperation with the inner surface of the propellor 40, these fins 41 and 42 define an upper intake area 43 and a lower intake area 44.
• This area 48 widens progressively from its initial area until it reaches a width equal to at least 30% of the width of the propellor 40 in the area substantially diametric to the initial area.
• This flow of air is conveyed through a space 54 which communicates with the slit 33, the space 54 being between the head of the air propellor 40 and the inner wall of the chassis 11 which is placed on the side of the flange 53 which mounts the motor 37.
• the head of the propellor 40 is closed by a screen 55 which prevents air entering.
• the width of the area 48, together with the rounded conformation of the inner surface of the chassis 11, causes part of the air, indicated by 49, to enter the recircling conduit 45 which is placed around the flame pipe 17, rather than entering directly the flame pipe 17 itself through the slit 33.
• the deflector element 46 is attached to the chassis 11 on the inner side from where the flange 53 is positioned and extends substantially on a horizontal plane to cover approximately the width of the propellor 40.
• the recircled air is confined in the upper intake area 43 by the diametric fins 41 and 42, after passing over the deflector element 46. From here it is forced by the propellor 40 into the sickle-shaped tangential area 47 between the propellor 40 and the chassis 11, acquiring new energy from the propellor 40.
• the tangential area 47 grows progressively wider towards the bottom and is found substantially at the same axial height as the air 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 the opening 15, which is found substantially in correspondence with the end of the tangential area 47.
• 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 the upper intake area 43 and the sickle-shaped tangential area 47.
• 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.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Gas Burners (AREA)
• Regulation And Control Of Combustion (AREA)
• Control Of Combustion (AREA)
• Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
• Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=11422052

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (7)

• 1996
  • 1996-03-22 IT IT96UD000036A patent/IT1288866B1/it active IP Right Grant
• 1997
  • 1997-03-14 EP EP97104380A patent/EP0797047B1/en not_active Expired - Lifetime
  • 1997-03-14 AT AT97104380T patent/ATE205930T1/de not_active IP Right Cessation
  • 1997-03-14 DE DE69706731T patent/DE69706731T2/de not_active Expired - Fee Related
  • 1997-03-14 ES ES97104380T patent/ES2163677T3/es not_active Expired - Lifetime

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