RU2740962C1 - Convection furnace - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to devices operating on solid fuel, namely, to heating furnaces. Convector furnace includes front wall with loading door, furnace housing, ash pan with grate and ash pit furnace door, branch pipe with gate, discharge gases from furnace. Furnace is equipped with chamber of furnace in form of round pipe, located in plan horizontally, along outer pipe housing is additionally fixed jacket in form of rectangular closed box from above, formed from blanks of sheet plates welded by welding seams on walls of horizontally located tube in form of furnace chamber, and sheet plates in front and behind outside of furnace chamber, which are also connected by welding seams with side workpieces of sheet plates and with cover, forming an external closed housing around round tube, and with formation of closed enclosure closed space with cavity. One end of the sheet plates is welded to the wall of the round pipe on the outside by the weld at height of 1/2 of the diameter of the round pipe. Round chamber of thermal firewood is formed by dividing along its length a partition with a deflector bent downwards towards the attachment on the bottom of the grate, and forming an adjacent chamber of spark arrester, in which is submerged below partition with deflector spark arrester deflected downward, smoke branch pipe with shutter and hole at end, passes through cavity of casing cavity towards adjacent chamber of spark arrester, upper end of end face is connected with bent branch pipe with outlet from heated room outside with smoke vertical pipe, in which additionally the ash box is made in the form of a drawer on the side of the side wall below the welding seam with a sheet plate of the casing, made in the form of a rectangular closed box. Round tube of furnace in horizontal position is made inside by height with division into two parts - upper and lower, by means of grate plate made of angular profile, which side walls expand their base upwards and form chute filled with sand. Space of the cavity under the cover of the casing from above on the outer wall of the round pipe, in the form of the furnace chamber, has a welded annular tube, the holes in the side walls of which are connected to the hollow radial - radial cantilever tubes, which are made with possibility to obtain heat transfer in cavity of hot air casing and simultaneously to discharge branch pipes to heated room.

EFFECT: technical result consists in simplification of furnace design and improvement of fire safety.

3 cl, 4 dwg

Description

The invention relates to heating devices operating on solid fuels, the main purpose of which is to heat tent houses, garden houses, cottages, workshops, greenhouses, individual garages and hot food preparation.

Known is a multifunctional camping stove having a housing in the lower part of which there is a firebox, a grate and a chamber installed in the housing above the firebox. The chamber is made with the possibility of placing in it a heat storage charge or lattice shelves for smoking. The grate installed above the firebox is hollow, the communicating cavities of the grate are plugged on one side, and on the other side are hermetically connected to the inner cavity of the container for heating water (Patent RU No. 2229657, F24C 1/16, 24C 13/00 dated 05/27/2004).

The disadvantages of this furnace are its structural and technological complexity. This design is material-intensive and quite expensive to manufacture. For its operation, the furnace requires the use of a gas or liquid burner, which increases its completeness and total weight. In addition, it is a batch oven, which limits its functionality.

Known is a multifunctional furnace containing a housing in which a firebox with a door, a chimney, a chamber for generating steam, a container for heating water and a pipe is located, is additionally equipped with an ash pan with an ash box made in the furnace body, a vertical screen - a convector, a support that is attached to to the body by means of guides inside the firebox, a flame arrester is installed, which is made shorter than the furnace and is rigidly fixed, for example, by welding to the side walls of the body, with a gap between its edge and the front wall of the body, the chimney is formed by a gap between the edge of the flame arrester and the rear wall of the body, a channel formed by the damper flame and the upper wall of the body and the outlet pipe, while a grate is installed in the furnace, made of two U-shaped blanks of sheet material, welded at an angle to each other with the formation of a stiffener, and the steam generation chamber is a steam generator formed by one or more profiled elements with the formation of compartments located one above the other and the side wall of the case, connected by channels, for the flow of water from the upper edema to the lower one and ensures the evaporation of water from the metal surface (Patent RU No. 70966, F24C 1/16 dated 20.02.2008).

The disadvantage of this furnace is the complexity of its design, the manufacturing technology requires high qualifications of welders in welding sheet metal and methods for monitoring the tightness of the seams. The labyrinthine system of chimneys for the intake of combustion gases of the furnace clutters it. In addition, this furnace lacks its spark arrestor design, which makes it fire hazardous for use in structures. Moreover, it has a traumatic layout, the chimney pipe is located near its front end facing the user. The vertical post of the located chimney is located dangerously close to the user's face, and in the confined space of the room, clothes or other exposed parts of the body may inadvertently touch the hot metal.

Known oven for cooking, containing, housing, furnace with slab flooring, afterburner chamber with a channel for supplying secondary air to it and formed between the furnace and the walls of the housing duct with a fan, a rotary cover and a nozzle with a damper (Author's certificate RU No. 1758344, F24B 7 / 02, 1/26 from 30.08.1992).

The disadvantage of this furnace is its low efficiency. In addition, the channels are clogged with soot, and it is not safe.

Known furnace containing external and internal furnace massifs with a chimney and an opening for air flow, while the internal furnace massif has a furnace with a grate, ash pan and partitions forming vertical and horizontal channels for flue gases, communicated with the chimney (Patent RU No. 21306, F24B 1/00 from 10.01.2002).

The disadvantage of this furnace is the use of the gap between the internal and external mass of the furnace only for heat exchange, namely for heating the secondary air, and therefore it is impossible to use the heated secondary air to regulate the draft, which in turn does not allow increasing the efficiency. In addition, it has a traumatic layout, the chimney pipe is located near its front end facing the user and when moving in a confined space, for example, a tent, an involuntary touch of hot metal by clothes or open parts of the body is possible.

Known convector oven, containing a housing with an upper plate and a movable partition installed under it, a front wall with a door with a blower and a throttle valve, a bottom, rear and side walls made with vertically arranged external air ducts, under the movable partition there are internal air ducts, one end connected to the external air-conducting channels of the side walls and brought out by the other end to the opposite side of the furnace above the openings of the external air-conducting channels, while the upper openings of the external air-conducting channels connected to the inner ones are made closed, the bottom is made with an inclination towards the front wall and with the air-conducting channels connected to the external air ducts of the rear wall (Patent No. 2097660, F24B 5/06 from 11/27/1997).

The disadvantages of this furnace are its structural and technological complexity. This design is material-intensive and quite expensive to manufacture. In addition, there is no spark arrestor in its design, which makes it fire hazardous for operation in closed rooms in a confined space. At the same time, the movement of the movable partition for the passage of flue gases into the chimney creates difficulties in operation, since soot can settle in the guides, which means that the movement of the movable partition under the upper plate becomes jammed, where the flue gases pass into the chimney. Air ducts are structurally complex with a labyrinth system and clutter up the furnace chamber.

The closest technical solution, a prototype, is the "Room air heater", containing a firebox, a front wall with a loading door, a casing located on three sides of the firebox, an ash pan with a grate and a blower door, air ducts, a branch pipe with a damper, exhaust gases, and supports ( Patent RU No. 2018769, F24B 5/06 from 30.08.1994).

The disadvantage of the "Room air heater" is a low efficiency, low productivity and the inability to heat water, cook food due to: there are no conditions for optimal thermal decomposition of firewood by the release of combustible gases, the formation of a combustible mixture with a high heat dissipation capacity, small specific dimensions of the surface heated by direct rays furnaces, participate in convective natural heat exchange, and, therefore, non-intensive selection of heat received in the heat exchanger furnace. Large amounts of heat and unburned gases are carried away by the exhaust gases into the chimney. In addition, there is no concentrated heating of the upper part of the heat exchanger and the air in the convective air ducts and there is no air intake with a developed surface and volume of the air ducts themselves, which reduces the rate of natural ventilation. In this case, there is no possibility of changing the active cross-section of the air intake and output, i.e. regulation of the speed and volume of air passing inside with ventilation. Another disadvantage is that the labyrinth chimney system for sampling flue gases along the height of the furnace necessitates its frequent cleaning, since it is quickly planted and the inconvenience in cleaning this labyrinth chimney system, accordingly, reduces the thrust and power of the furnace.

The task of the proposed technical solution is to create a structurally simple, technologically advanced in production, safe heating and cooking device, which can provide reliable protection against the emission of sparks from the chimney, so that it can be operated in various enclosed spaces, for example, as part of tented structures, garage structures, and having at the same time a safe layout and high efficiency.

The technical result of the invention is to simplify the design of the furnace, increase its manufacturability and the ability to optimally control the gas-flame flow, ensuring fire safety and reducing the emissions of furnace particles into the atmosphere, as well as increasing the productivity of heated air volumes and a sharp increase in the heat load on the furnace. Providing the ability to heat water and prepare food.

диаметра круглой трубы, соответственно, образована круглая камера термической топки дров, которая образована путем разделения по ее длине перегородкой с отогнутым вниз козырьком в сторону крепления на дне колосниковой решетки, и образуя смежную камеру искрогасителя, в которую погружен ниже перегородки с отогнутым козырьком вниз искрогасителя дымовой патрубок с заслонкой и отверстием на торце, проходит через пространство полости кожуха в сторону смежной камеры искрогасителя, верхним отверстием торца связан с изогнутым патрубком с выходом из отапливаемого помещения наружу с дымовой вертикальной трубой, в которой дополнительно зольник выполнен в виде выдвижного ящика со стороны боковой стенки ниже сварочного шва с листовой пластиной кожуха, выполненного в форме прямоугольной замкнутой коробки, при этом круглая труба топки в горизонтальном положении выполнена внутри по высоте с разделением на две части - верхнюю и нижнюю, с помощью колосниковой решети, выполненной из уголкового профиля, боковые стенки которого расширяются своим основанием вверх, и образуют желоб, засыпанный песком, кроме того, пространство полости под крышкой кожуха сверху на наружной стенке круглой трубы, в виде камеры топки, имеет приваренную кольцевую трубку, отверстия, в боковых стенках которой, соединены с пустотелыми лучевыми - радиальными консольными трубками, которые выполнены с возможностью получения теплоотдачи в полости кожуха горячего воздуха и одновременно в отводящие наружные патрубки в отапливаемое помещение.The problem is solved due to the fact that a convection oven containing a front wall with a loading door, a furnace body, an ash pan with a grate and a blower door, a branch pipe with a damper that removes gases from the furnace, according to the invention, it is equipped with a furnace chamber in the idea of a round pipe, located horizontally in the plan, a casing in the form of a rectangular closed box from above is additionally fixed along the outer casing of the pipe, formed from blanks of sheet plates welded with welding seams on the sides of the walls of a horizontally located pipe in the form of a furnace chamber, and sheet plates in front and behind outside the furnace chamber, which are also connected by welding seams with side blanks of sheet plates and with a cover, forming an outer closed casing around a round pipe, and with the formation of a closed casing of a closed space C with a cavity, while one end of the sheet plates is welded from the side by a weld seam to the wall of a circular pipe outside at a height

diameter of a round pipe, respectively, a circular chamber of a firewood thermal combustion chamber is formed, which is formed by dividing along its length by a partition with a bent down visor towards the attachment at the bottom of the grate, and forming an adjacent spark arrester chamber, into which it is immersed below the partition with a bent visor downward of the a branch pipe with a flap and an opening at the end, passes through the space of the casing cavity towards the adjacent spark arrestor chamber, by the upper opening of the end end is connected with a curved pipe with an exit from the heated room to the outside with a vertical chimney, in which the ash pan is additionally made in the form of a drawer on the side of the side wall below the weld with a sheet plate of the casing, made in the form of a rectangular closed box, while the round furnace tube in a horizontal position is made inside in height with division into two parts - upper and lower, using a grate made of an angle profile, more whose walls expand upward with their base and form a trough filled with sand, in addition, the space of the cavity under the casing cover on top of the outer wall of the circular pipe, in the form of a furnace chamber, has a welded annular tube, the holes in the side walls of which are connected to the hollow beam - radial cantilever tubes, which are made with the possibility of obtaining heat transfer in the cavity of the hot air casing and at the same time in the outgoing external nozzles into the heated room.

In addition, the outlet cantilever outer nozzles, one of which is connected to the space of the cavity of the closed casing, is fixed in the front wall above the loading door, and the other - from the side wall in the upper part with a welded sheet plate of the casing towards the rear wall, while the outlet openings the ends of the outlet pipes outside the casing of the piping, in the form of a rectangular box, are equipped with rotary dampers, the axis of rotation of which is attached to the walls of the pipes for directing hot air regulation into the heated room.

In addition, the outlet outer pipe on the front wall from the side of the loading door can be used to connect a fan to it for blowing air into the cavity with a unit located in the form of a closed annular tube with radial - radial cantilever tubes.

FIG. 1 shows a convection oven with a folding table with a handle on top, top view; in fig. 2 is a longitudinal sectional view of a convection oven; in fig. 3 - section of the furnace in the form of a round pipe with a casing (without the front wall); in fig. 4 is a view of an annular closed tube with radial-radial tubes (without the casing cover).

диаметра круглой трубы. Замкнутое пространство кожуха образует полость 9, в которой над верхней стенкой топки 1 приварена круглая кольцевая замкнутая трубка 10, боковые радиальные отверстия которой соединены с лучевыми - радиальными консольными трубками 11, горизонтально закрепленными под крышкой 8 над кривой окружности верха круглой трубы в виде камеры топки 1. Круглая замкнутая кольцевая Трубка 10 с радиальными отверстиями и с лучевыми - радиальными трубками расположены в пространстве полости 9 замкнутого прямоугольного кожуха в виде коробки с нагревом горячим воздухом внутри его от круглых стенок трубы, выполненной топочной камеры в плане горизонтально, т.е. при наличии геометрических параметров ее позволяет создать увеличенный объем нагреваемого воздуха стенками топки 1.A convection oven with a wood-burning firebox consists of a firebox 1, a rear wall 2, a front wall 3 with a loading door 4, a grate 5, an ash pan 6. The grate 5 is made of an angle profile with an upwardly expanding base in the form of a gutter, the latter is covered with sand to avoid it burnout of the walls. The firebox 1 is made of a round pipe, located horizontally in plan, with welded seams of separate blanks of plates 7 made of metal sheets. The sheet side plates 7 of the material are connected by a common cover 8 with the help of welding seams, both with the front wall 3 and with the rear wall 2, forming a binding of a closed casing with a space with a cavity 9 from parts of the sides, and from above the combustion chamber from a horizontally located pipe in the form of a firebox. The end of the sheet material 7 is welded from the side to the wall of the round pipe from the outside at a height

diameter of a round pipe. The closed space of the casing forms a cavity 9, in which a circular annular closed tube 10 is welded above the upper wall of the furnace 1, the lateral radial holes of which are connected to the radial - radial cantilever tubes 11, horizontally fixed under the cover 8 above the curve of the top of the circular tube in the form of a furnace chamber 1 A round closed annular tube 10 with radial holes and radial-radial tubes are located in the space of the cavity 9 of a closed rectangular casing in the form of a box with heating by hot air inside it from the circular walls of the tube, made horizontally in the plan of the combustion chamber, i.e. in the presence of geometric parameters, it allows you to create an increased volume of heated air by the walls of the furnace 1.

The body of the closed casing on top of the furnace 1 is made in such a way that metal outlet pipes 12 and 13 with adjustable dampers 14 and 15 are welded to the front wall 3 on the side and, respectively, opposite to one of the sides of the side wall of the plate 7, and the outlet pipes 12 and 13 made slightly larger than the diameter of the annular closed tube 10 with radial - radial tubes 11. The assembly of tubes 10 and 11 is covered from above by a cover 8, and the cavity 9 is formed closed. Through the outlet pipes 12 and 13, hot air from the cavity 9 comes out towards the heated room. Thus, in front, behind and half of the pipe on the side, the firebox 1 (heat carrier) is additionally closed with a light casing, forming a closed space of the cavity 9, and the casing perceives heat exchange through its walls from the round pipe in the form of a firebox 1. Thus, the enclosing closed casing around the firebox 1 with the space of the cavity 9 creates a horizontal convective cavity 9 for natural ventilation by means of the opposite to each other the outlet pipes 12 and 13.

In addition, for the combustion of solid fuel, the inner cavity of the furnace 1 is divided by a partition 16 with a visor 17 bent down (curved), which is directed towards the grate 5, into two unequal parts, one of which is made with a grate 5 with an ash pan 6, and the second part is made by a spark arrester in the form of an adjacent chamber 18 with a retractable ash pan 19 (without blowing) in the form of an open box in the side wall of the furnace, but next to the rear wall 2 below the weld seam of the side welded plate 7. The movable ash pan 19 is fixed in the guides and is able to move from by means of a handle (not shown) with the accumulation of falling soot and unburned residues of sparks emitted by flue gases into the chimney 20 with an adjustable damper 21, the curved nozzle 22, removably connected to the chimney vertical tube 23, i.e. the chimney is a prefabricated module.

The surface of the furnace 1 in the form of a horizontally circular pipe, closed from the sides by separate plates 7, as well as in front by plate 3, behind by plate 2 and with a cover 8, above the annular closed tube 10 with radial holes and with radial - radial cantilever tubes 11, form a developed heating surface, absorbing most of the heat of the furnace, storing and transferring this heat not only with their walls, but also the upper part of the incoming hot air due to the convective cavity 9 using outlet pipes 12 and 13 with adjustable dampers 14 and 15.

A possible embodiment, when from above to the cover 8 of the casing, is mounted by placing a folding metal table 24 or a grate with a handle 25 with a locking latch 26 to the vertical post 27 and a hinge joint 28.

Thus, a closed casing covering the shape of the furnace body 1 (horizontally placed round pipe) is fixed on the supports 29 from below. The furnace 1 forms a space from above with a cavity 9 on the sides and on top of the furnace 1. Through the cavity 9 of the casing, it passes into the spark arrester 18 into a cooked smoke nozzle 20 with an adjustable damper 21 from the side of the rear wall 2, the lower part of the opening of the end of the nozzle 20 at a certain height is lowered down and , below the end face of the bent visor 17 of the partition 16 of the spark arrester, i.e. into the afterburner.

In this case, an embodiment is possible with the use of a fan (not shown) for forced blowing of hot air from the space of the cavity 9 into the heated room with its connection to the branch pipe 13 from the side in the upper part of the front wall 3, which increases the efficiency of using hot air to exit to the heated room.

The entire convection oven stands on four supports 29.

A wood-fired convection oven works as follows.

The furnace is installed on removable supports 29. The assembled modular chimney as a whole is put on the chimney 20 with a damper 21 that regulates the flue gas outlet mode of the operating furnace 1 in the form of a circular pipe located horizontally. On the grate 5, made of a corner profile with a groove, which is pre-filled with sand to protect it from burning with a hot flame when laying firewood and burning it. The presence of a temperature in the firebox of 280-300 ° C causes thermal decomposition of firewood with the release of volatile hot gases in the firebox 1. In this case, the ashpit door 6 opens to a certain distance, opening the access of the air supplied for combustion, and is regulated by the degree of opening of the ashpit door 6.

Hot flame and hot gases expand at the first stage during ignition and warming up of a certain shape in terms of a horizontally installed firebox 1 in the form of a round pipe, the vault of which in the upper part inside with side walls has a smooth upward curvature, thanks to which the gas-flame flow is directed evenly from the firebox 1 through the partition 16 with the visor 17 bent down towards the grate 5, and then passes into the cavity of the adjacent spark arrester chamber 18 along the shortest path. For this, the lower end of the opening of the end of the smoke pipe 20 is lowered below the partition 18 of the spark arrester of the adjacent chamber 18. The task at the first stage of "ignition" is to provide the gas-flame flow with the lowest hydraulic resistance. This allows, when the damper 21 is open, to heat the stove and warm up its chimney 23 with a bent elbow in the form of a nozzle 22, dressed and fixed at the end of the top of the chimney 20, without ejection of smoke through the loading door 4.

Afterburning is carried out by direct contact of the flame of the furnace 1 with fuel particles in a gaseous state passing over the visor 17 of the spark arrester bent down in the chamber 18 with the lowering channel of the smoke pipe 20.

At the second stage, after the entire chimney 23 has warmed up in height, it is possible to close the damper 21 to the "operating mode" position, when the gas-flame flow is inhibited in its movement on its way to the adjacent spark arrestor chamber 18, the furnace quickly heats up. A circular combustion chamber 1 in plan view of a horizontally located circular pipe 1, fixed on supports 29 from above, with a strapping above the outer casing, consisting of welded seams of scraps of plates 7, front wall 3 and rear wall 2, connected by welding seams from above with a cover 8, and form a closed air space with a cavity 9. At the same time, the damper 21, regulation during operation of the furnace, allows you to adjust the smoke draft and the degree of heating of the entire furnace area as a whole, and change the horizontal flow inside the furnace 1, passing into the spark arrester 18 cavity.

In the first position "ignition" and the second position "operating mode" equally effectively performs the function of a spark arrestor of the convection oven. The cavity of the combustion chamber of the furnace 1, due to the rounded shape of the walls of the pipe 1 after the grate 5, is separated from the cavity of the spark arrester 18 by means of a vertical partition 16 with the visor 17 bent downwards, which at the top does not reach the rounded cavity (arch) of the wall of the furnace 1 for a certain distance, forming a sufficient opening for the passage of the flame flow. The chimney pipe 20 has a passage through the cavity 9 of the closed casing and above the cover 8 in the rear wall 2, and has a protruding part with a damper 21. An elbow 22 with a vertical chimney 23 is mounted on the opening of the upper end of the pipe 20 in the form of a modular type, and the lower part of the branch pipe 20 is immersed in the cavity of the spark arrester 18 of the adjacent chamber so much lower than the upper cut of the partition 16 with the visor 17 of the spark arrester to force the gas-flame flow to make a sharp 180 degree turn in the vertical plane. Particles of unburned fuel, which have any significant weight and the ability to long-term smoldering during a sharp turn of the gas-flame flow, are separated from it under the influence of centrifugal force, and settle in the lower part of the chamber (containers in a retractable ash pan 19 (without blowing) in the form of an open box on top of the spark arrester, without getting the opportunity to fly into the chimney and damage any roof of the room, it should be noted that due to the presence of a retractable ash pan 19, it is possible to collect some of the glowing sparks of fuel and settled soot with subsequent release from the accumulation and clogging of the spark arrester 18, which is not noted In none of the known technical solutions (it is absent, in principle, in them), which means that the operational reliability of such a convection oven is ensured at the proper level during the operation of the oven.

The proposed layout of the closed casing, covering a part in plan, a horizontally installed firebox 1 in the form of a round pipe presents the user with such important functions as heating the double structure of the casing as a whole (external and internal furnace massifs), in which the space of the cavity 9 is created between the rounded the outer walls of the pipe 1 with side trims of the plates 7, with the rear 2 and front 3 walls, which are closed from above by the cover 8 due to the welding seams. The casing heats up with hot air quickly enough to hot in a large volume with the placement in the space of the cavity 9 with the walls of the furnace 1, with the release of additional heat to it together with a small annular closed tube 10 with radial holes, with which one end is connected to horizontal cantilever beam - radial tubes 11 , one of the free ends of which is made open, and the tubes 11 themselves in this case are cantilevered due to the shape of the upper outer wall of the furnace 1, which allows the tubes open around in a closed space of the cavity 9 to be heated with hot air, and at the same time by reflecting radiant heat from the upper walls (roof) of the furnace 1. Air cavity 9 is heated by hot air, where intensely heated air enters the outlet pipes 12 and 13 with adjustable dampers 14 and 15, or with the possibility of being removed from the cavity 9 forcibly using a fan (not shown), then heated air enters the heated room, i.e. comes out with open dampers 14 and 15. At the same time, the body of the furnace 1 and the casing tied with it with side plates 7 and cover 8, and the assembly of a closed annular tube with radial-radial tubes, which also play the function of an effective heat exchanger, forcing the gas-flame flow before being ejected into the chimney, move along its predetermined trajectory and give more heat for heating with hot air cover 8 from the firebox 1. Such a constructive solution of the double design of the heating convection oven with the arrangement of structural elements provides rapid heating of air in the cavity of a rectangular closed casing above a round pipe (firebox ), which means good heating with a heat insulator and increased fire safety of the proposed furnace design, and recommend it as part of heated structures sensitive to the burning of walls by sparks, where it is usually difficult, in addition, it is an effective heating - cooking furnace , or n To cook food or warm up water, use the top cover of the casing as a flat surface of the heat sink with a temperature of somewhere between 350-450 ° C on which you can put a kettle, a saucepan, a baking sheet, etc., for this you need to remove or tilt the removable table from above lids around the hinge, as well as drying products / option with the top on the lid of the installation of a placed folding metal table or grill with fastening.

It should be noted that the heat accumulated by the internal array of the cavity of the furnace device for a long time is transferred to the room, increasing the efficiency of the convector oven, which has the cavity and heating elements inside, and this is due to the geometric shape of the furnace itself, and is recommended not only in garages , but also for stoves in tents and frame - for tending structures.

Thus, the proposed technical solution of the convection oven provides compression of the fuel and spark arrester with high efficiency, intensive heat extraction, natural convection ventilation, heating the room with warm air in large volumes, the ability to heat water and cook food.

Claims (3)

1. A convection oven containing a front wall with a loading door, a furnace body, an ash pan with a grate and a blower door, a branch pipe with a damper that removes gases from the firebox, characterized in that it is equipped with a firebox chamber in the form of a circular pipe located horizontally in the plan, along the outer casing of the pipe, a casing is additionally fixed in the form of a rectangular closed box from above, formed from blanks of sheet plates welded with welding seams on the sides of the walls of a horizontally located pipe in the form of a furnace chamber, and sheet plates in front and behind outside the furnace chamber, which are also connected by welding seams to side blanks of sheet plates and with a lid, forming an external closed casing around a round pipe, and with the formation of a closed casing of a closed space with a cavity, while one end of the sheet plates is welded from the side by a welding seam to the wall of the round pipe outside at a height of 1/2 of the diameter of the round pipe, respectively, a round chamber is formed a conventional firewood firebox, which is formed by dividing along its length by a partition with a bent down visor towards the attachment at the bottom of the grate, and forming an adjacent spark arrester chamber, into which a smoke pipe with a damper and an opening at the end is immersed below the partition with a downward deflection through the space of the casing cavity towards the adjacent spark arrestor chamber, the upper end hole is connected with a curved pipe with an exit from the heated room to the outside with a vertical chimney, in which the ash pan is additionally made in the form of a drawer from the side wall below the weld with a sheet plate of the casing made in the form of a rectangular closed box, while the round firebox pipe in a horizontal position is made inside in height with a division into two parts - upper and lower, using a grate made of an angle profile, the side walls of which expand with their base upwards and form a The spruce covered with sand, in addition, the space of the cavity under the cover of the casing on top of the outer wall of the circular pipe, in the form of a furnace chamber, has a welded annular tube, holes in the side walls of which are connected to hollow radial - radial cantilever tubes, which are made with the possibility of obtaining heat transfer in the cavity of the hot air casing and at the same time in the outgoing external pipes to the heated room. 2. The convection oven according to claim 1, characterized in that the outlet cantilever external nozzles, one of which is connected to the space of the cavity of the closed casing, is fixed in the front wall above the loading door, and the other - from the side wall in the upper part with a welded sheet plate of the casing towards the rear wall, while the outlet openings of the ends of the outlet pipes outside the casing of the strapping, in the form of a rectangular box, are equipped with rotary dampers, the axis of rotation of which is attached to the walls of the pipes for diverting the regulation of hot air into the heated room. 3. The convection oven according to claim 1, characterized in that the outlet outer pipe on the front wall from the side of the loading door can be used to connect a fan to it for blowing air into the cavity with a unit located in the form of a closed annular tube with radial - radial cantilever tubes ...

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