CN112425612A

CN112425612A - Spiral racetrack oven

Info

Publication number: CN112425612A
Application number: CN202011171775.7A
Authority: CN
Inventors: 付文兵; 李承平
Original assignee: Guangzhou Fuya Machinery Co ltd
Current assignee: Guangzhou Fuya Machinery Co ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-03-02

Abstract

The invention discloses a spiral racetrack oven, which comprises a baking room, a guide rail, a transmission carrier, a fan part and a plurality of fire tubes for burning fuel gas to generate heat. The transmission carrier is arranged along the extending direction of the guide rail, the transmission carrier is used for conveying the package blanks to move along the extending direction of the guide rail, and the fire tubes are inserted into the spiral structure along the height direction. Fan elements are provided within the helical structure for directing airflow from the centre of the elliptical shape towards both ends of the major axis of the elliptical shape. The baking room comprises a plurality of baking oven storerooms, one side of each baking oven storeroom is provided with a groove, one side, opposite to the groove, of each baking oven storeroom is provided with a convex strip, and the convex strips of one baking oven storeroom are connected with the grooves of the other baking oven storeroom in an inserting mode. The baking oven not only can bake a large number of package blanks, but also can solve the problems of insufficient heat and uneven distribution of the baking oven; in addition, the problem that the oven is damaged due to expansion caused by heat and contraction caused by over high temperature in the oven can be avoided.

Description

Spiral racetrack oven

Technical Field

The invention relates to the technical field of ovens, in particular to a spiral racetrack oven.

Background

The oven can be used for baking to make bread, hamburger, pastry, etc. Conventional ovens are generally of elongated configuration, i.e. the blanks (i.e. the blanks to be baked) pass through the oven along a straight conveyor line, eventually becoming the product. Obviously, the traditional oven not only occupies a large area, but also has lower production efficiency. Patent application No. cn201811571276.x discloses a food conveying device, which allows an oven to accommodate the total number of blanks, but has a problem of reduced baking efficiency due to poor heating effect. Meanwhile, when the temperature in the oven is greatly increased in order to improve the baking efficiency of the oven, the oven itself is easily damaged due to expansion with heat and contraction with cold.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a spiral racetrack oven which not only can bake a large number of package blanks, but also can solve the problems of insufficient heat and uneven distribution of the oven; in addition, the problem that the oven is damaged due to expansion caused by heat and contraction caused by over high temperature in the oven can be avoided.

The purpose of the invention is realized by adopting the following technical scheme:

a spiral racetrack oven comprises a baking room, a guide rail, a transmission carrier, a fan part and a plurality of fire tubes for burning fuel gas to generate heat; the guide rail is circularly wound into a spiral structure along the height direction, and the outline of the top view of the spiral structure is in an oval shape; the conveying carrier is arranged along the extending direction of the guide rail and used for conveying the blank to move along the extending direction of the guide rail, the fire tubes are inserted into the spiral structure along the height direction and are respectively distributed on two opposite sides of the long axis of the oval shape, and the fire tubes are close to the center of the oval shape and far away from the tail end of the long axis of the oval shape; the fan component is arranged in the spiral structure and is used for guiding airflow from the center of the oval shape to two ends of the long axis of the oval shape;

roast room includes a plurality of oven storehouse boards, the oven storehouse board is rectangular form structure, one side of oven storehouse board is equipped with the recess, the one side relative with the recess on the oven storehouse board is equipped with the sand grip, the recess with the sand grip is all followed the length direction of oven storehouse board extends, pegs graft through one of them sand grip and another's recess between the adjacent oven storehouse board to make each oven storehouse board end to end and form roast room lateral wall that extends along the horizontal direction on the roast room.

Further, the roast room is the cuboid structure, and four roast room lateral walls in roast room are all through a plurality of the oven storehouse board constitutes, mutual fixed connection between the adjacent roast room lateral wall in roast room.

Further, the width of the groove minus the width of the convex strip is larger than 1 mm.

Further, roast room still includes the cuboid frame, the cuboid frame has the mounting bar that the level was placed, the oven reservoir board orientation one side of roast room inside is equipped with the mounting, the mounting is equipped with the constant head tank, during the installation, each the constant head tank is suitable for along the horizontal direction cunning to the mounting bar to make one of them sand grip and another's recess peg graft between the adjacent oven reservoir board.

Further, the mounting strips are protruded towards the inner side close to the curing barn to form supporting strips; the curing barn also comprises a top cover, and the top cover is detachably arranged on the supporting bars; the top cover is connected with at least two exhaust fans, and the two exhaust fans are respectively positioned at two ends of the elliptical short shaft.

Furthermore, the guide rail comprises an inner ring and an outer ring, the outer contours of the inner ring and the outer ring in the top view are both in an oval shape, the inner ring spirally surrounds upwards along the vertical height direction, then outwards surrounds along the horizontal direction, and then spirally surrounds downwards along the vertical direction to form the outer ring; the fire tubes are inserted into the inner ring and the outer ring.

Furthermore, the fan component comprises an impeller, an air guide pipe and a plurality of air outlet pipes communicated with the air guide pipe, the impeller is installed in the center of the oval shape and used for introducing air flow into the air guide pipe, and the air outlet pipes are inserted into the spiral structure in the height direction.

Furthermore, the air outlet pipes are respectively arranged at two ends of the long shaft in the oval shape;

the fan component is a centrifugal fan, the air guide pipes are arranged in a plurality, and each air guide pipe is connected with a plurality of air outlet pipes respectively.

Furthermore, it is a plurality of it is equipped with a plurality of air-out side openings to go out the tuber pipe, it is a plurality of the air-out side opening is followed the length direction of going out the tuber pipe and/or the circumference interval ground that goes out the tuber pipe distributes, it is Y type structure to go out the tuber pipe.

Further, the fire tube is provided with a plurality of ignition holes which are distributed at intervals along the length direction of the fire tube and/or the circumferential direction of the fire tube;

the fire tube is of a V-shaped structure, and the corner of the fire tube is closer to the fan part than the two ends of the fire tube;

the spiral racetrack oven also comprises an air pipe and a fuel gas pipe, and the air pipe is communicated with the fire pipe after being converged with the fuel gas pipe;

the air pipe and the fuel gas pipe are controlled by a zero-pressure proportional combustion system.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the guide rails in a spiral configuration, the transport carrier is thus able to carry a large number of bales for fermentation in the baking chamber. Importantly, the fire tubes are directly inserted into the spiral structure along the height direction so as to ensure that the heat source is closely wound around the periphery of the guide rail, so that the blank can travel on the guide rail at high speed, and the heat can be uniformly received to realize baking. At the moment, the package blanks can be conveyed into the baking chamber in a large batch, and products generated after baking are conveyed out of the baking chamber in a large batch, so that the production efficiency is greatly improved.

2. In addition, because the conveying carrier can bear a large amount of package blanks, the heat required in the baking chamber is huge, the fire tubes adopt a heat supply mode of open fire, the requirement is properly met, meanwhile, the package blanks run on the guide rail at high speed, the long-time fixed-point baking by the open fire is avoided, and the baking effect is better.

3. Meanwhile, the baking effect and the yield are considered.

4. Since the fire tubes are distributed on opposite sides of the long axis of the oval shape, the fire tubes are near the center of the oval shape and away from the ends of the long axis of the oval shape. At this time, the heat source is mainly close to the center of the oval shape, and the fan part circularly discharges heat to two ends of the long shaft of the oval shape, so that the temperature in the whole baking chamber is more uniform. And at the moment, the conveying carrier carries the package blanks at a high speed, so that the package blanks are uniformly heated in most of the stroke of the guide rail, and the baking efficiency is higher. Meanwhile, the fan component can enable the temperature in the baking chamber to circularly flow, and local high temperature is avoided.

5. The adjacent oven storehouses are spliced with the grooves of the other one through the convex strips of one of the adjacent oven storehouses, so that the oven storehouses are connected end to form the baking room side walls extending along the horizontal direction on the baking room. Set up like this, when the roast room lateral wall is heated, thereby be heated the inflation and extrude each other between each oven storehouse board, be the grafting structure based on sand grip and recess, not only satisfied the stable supporting effect of roast room lateral wall, because each oven storehouse board all can the thermal energy moreover, and when the oven storehouse board is heated, adjacent oven storehouse board was kept away from each other to avoid certain local stress concentration and the damage of roast room lateral wall.

Drawings

FIG. 1 is a schematic view of a combustion system of a roaster oven in accordance with the present invention;

FIG. 2 is an enlarged view of a portion of A shown in FIG. 1;

FIG. 3 is a schematic diagram of the construction of the fire tube of FIG. 1;

FIG. 4 is a schematic structural view of a circulation system of a baking oven according to the present invention;

FIG. 5 is a schematic view of the fan assembly shown in FIG. 4;

FIG. 6 is a schematic view of a spiral racetrack oven of the present invention;

FIG. 7 is a schematic view of an oven cavity plate of the present invention;

FIG. 8 is a schematic structural view of the baking chamber of the present invention, wherein the top cover is hidden for the purpose of clearly seeing the internal structure of the baking chamber;

fig. 9 is a partial enlarged view of fig. 8 at B.

In the figure: 1. a guide rail; 11. an inner ring; 12. an outer ring; 2. a fan component; 21. an air guide pipe; 22. an air outlet pipe; 23. air outlet side holes; 3. a fire tube; 31. an ignition hole; 4. a curing barn; 41. oven storage plates; 411. a groove; 412. a convex strip; 413. a through hole; 42. a rectangular parallelepiped frame; 421. mounting a bar; 422. a fixing member; 423. positioning a groove; 424. a supporting strip; 43. a top cover; 5. an exhaust fan.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used herein, "vertical," "horizontal," "left," "right," and similar expressions are for purposes of illustration only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Fig. 1-2 show a roaster combustion system of the present invention for installation in a roasting chamber, i.e., in operation, in a large volume roasting chamber, the temperature of which is suitable for fermentation of bread loaves. The combustion system of the roaster comprises a guide rail 1, a transmission carrier and a plurality of fire tubes 3 for burning gas to generate heat. The guide rail 1 is circularly wound into a spiral structure along the height direction, namely the guide rail 1 is arranged in a stacked mode and is circularly wound into the spiral structure; because the guide rail 1 is wound into a spiral structure along the height direction, the length of the guide rail 1 is prolonged, and the guide rail 1 can bear more blank packages. The outer contour of the top view of the spiral structure is in an elliptical shape so as to shorten the width direction of the spiral structure and further reduce the occupied area required by a combustion system of the baking furnace. The conveying carrier is arranged along the extending direction of the guide rail 1 and used for conveying the package blanks to move along the extending direction of the guide rail 1, and the fire tubes 3 are inserted into the spiral structure along the height direction so as to transfer heat to the guide rail 1 in a close range, so that the heat is fully utilized.

It can be understood that, regarding the arrangement of the guide rail 1 and the conveying carrier, the food conveying device disclosed in the patent application document with the patent application number of cn201811571276.x may be cited. For example: the transport carrier comprises a chain which is movable in the extension direction of the guide 1 and which is used to transport the blanks moving in the extension direction of the guide 1. It can be understood that the chain can be driven by the cooperation of the driving motor and the gear in the prior art. Here, it should be noted that the chain may be replaced by a wire rope, a roller wire, or the like as long as the chain can move in the extending direction of the guide rail 1. The transmission carrier still includes walking support, and walking support is used for supporting tray or dish, and tray or dish are used for holding the package base, and walking support fixed connection chain to follow the chain and remove along the extending direction of guide rail 1, thereby make the process of transporting of tray or dish more steady.

According to the combustion system of the baking oven, the guide rail 1 is arranged to be in a spiral structure, so that the conveying carrier can carry a large number of package blanks to ferment in the baking chamber. Importantly, the baking is realized by inserting the fire tubes 3 directly in the height direction in the spiral structure to ensure that the heat source is closely wound around the circumference of the guide rail 1, so that the pack can travel on the guide rail 1 at a high speed to uniformly receive heat. At the moment, the package blanks can be conveyed into the baking chamber in a large batch, and products generated after baking are conveyed out of the baking chamber in a large batch, so that the production efficiency is greatly improved. In addition, because the conveying carrier can bear a large amount of package blanks, the heat required in the baking chamber is huge, the fire tube 3 adopts the heat supply mode of open fire, the requirement is properly solved, meanwhile, the package blanks run on the guide rail 1 at high speed, the long-time fixed-point baking by the open fire is avoided, and the baking effect is better. That is, both the baking effect and the yield are considered.

As a further preferred embodiment of the roaster furnace combustion system: the guide rail 1 comprises an inner ring 11 and an outer ring 12, the outer contours of the inner ring 11 and the outer ring 12 in the top view are both in an oval shape, the inner ring 11 spirally surrounds upwards along the vertical height direction, then spirally surrounds outwards along the horizontal direction, and then spirally surrounds downwards along the vertical direction to form the outer ring 12; the fire tube 3 is inserted into both the inner ring 11 and the outer ring 12. The arrangement not only further enlarges the yield, but also ensures that enough heat is provided in the baking chamber.

As a further preferred embodiment of the roaster furnace combustion system: referring to fig. 3, the fire tube 3 is provided with a plurality of ignition holes 31, and the plurality of ignition holes 31 are spaced apart from each other along the length direction and/or the circumferential direction of the fire tube 3. With this arrangement, the heat distribution of the fire tubes 3 can be made more uniform, so that the temperature distribution in the baking chamber can be made more uniform. In addition, the damage of the ladle blank caused by the local over-high temperature of the fire tube 3 can be avoided.

As a further preferred embodiment of the roaster furnace combustion system: the fire tube 3 has a V-shaped configuration, and the corners of the fire tube 3 are closer to the center of the oval shape than the ends of the fire tube 3. It will be appreciated that the corners of the fire tube 3 are the bends of the V-shaped structure. This is provided so that the heat is more evenly distributed in the centre of the oval shape.

As a further preferred embodiment of the roaster furnace combustion system: the combustion system of the baking oven further comprises an air pipe and a fuel gas pipe (not shown in the figure), and the air pipe is communicated with the fuel gas pipe and the fire pipe 3 after being converged. In order to improve combustion efficiency and easy access, air pipe and gas pipe all are equipped with a plurality ofly, one 3 correspond one of firetube the air pipe with one the gas pipe. More importantly, for safety reasons, the air and gas tubes are controlled by existing zero pressure proportional combustion systems.

Fig. 4 illustrates a roaster oven circulation system of the present invention comprising the roaster oven combustion system and the fan assembly 2 as described. Specifically, the fan member 2 is provided in a helical structure, and the fan member 2 is used to guide the airflow from the center of the elliptical shape to both ends of the long axis of the elliptical shape. In particular, several fire tubes 3 are distributed on opposite sides of the long axis of the oval shape, the fire tubes 3 being near the center of the oval shape and away from the ends of the long axis of the oval shape. At this time, the heat source is mainly close to the center of the oval shape, and the fan part 2 circularly discharges heat to both ends of the long axis of the oval shape, so that the temperature in the whole baking chamber is more uniform. And, because the conveying carrier carries the package base at a high speed at this moment, also make the package base heat evenly in most half of the journey of guide rail 1, therefore toast the efficiency better. Meanwhile, the fan part 2 can make the temperature in the baking chamber circularly flow, and local high temperature is avoided.

As a further preferred embodiment of the roaster oven circulation system: referring to fig. 5, the fan component 2 includes an impeller (not shown in the figure), an air guide duct 21, and a plurality of air outlet ducts 22 communicated with the air guide duct 21, the impeller is installed in the center of the elliptical shape, the impeller is used for introducing air flow into the air guide duct 21, and the air outlet ducts 22 are inserted into the spiral structure in the height direction. By the arrangement, hot air flowing out through the air outlet pipe 22 is uniformly distributed on the guide rail 1, so that heat absolutely contacts with the package blanks to ensure that each package blank receives more stable baking heat.

As a further preferred embodiment of the roaster oven circulation system: the air outlet pipes 22 are respectively arranged at two ends of the long shaft of the oval shape. It will be appreciated that the fire tubes 3 are distributed on opposite sides of the long axis of the oval shape based on the fire tubes 3 being located near the center of the oval shape and away from the ends of the long axis of the oval shape. By the arrangement, the hot air in the baking chamber can be circulated in a more orderly manner.

As a further preferred embodiment of the roaster oven circulation system: the fan component 2 is a centrifugal fan, the air guide pipes 21 are provided with a plurality of air outlet pipes 22, and the air guide pipes 21 are respectively connected with the air outlet pipes 22. Obviously, the centrifugal fan can uniformly discharge heat along each air outlet pipe 22, so that the temperature in the baking chamber is more uniform.

As a further preferred embodiment of the roaster oven circulation system: the air outlet pipes 22 are provided with a plurality of air outlet side holes 23, and the air outlet side holes 23 are distributed at intervals along the length direction of the air outlet pipes 22 and/or the circumferential direction of the air outlet pipes 22; the air outlet pipe 22 is of a Y-shaped structure. By means of the arrangement, hot air of the air outlet pipe 22 can be more uniformly distributed on the guide rail 1.

Figure 6 shows a spiral racetrack oven of the invention comprising an oven circulation system as described and an oven chamber 4, the interior of which oven chamber 4 is, obviously, the baking chamber. Referring additionally to fig. 6-8, baking room 4 of the present invention includes a number of oven storage boards 41.

Among them, referring to fig. 7, the oven storage plate 41 is a hollow structure to form a receiving cavity, and the receiving cavity is filled with a heat insulating material, thereby playing a role of heat insulation.

Specifically, the baking room 4 of the spiral racetrack oven of the present invention includes a plurality of oven storerooms 41, each oven storeroom 41 is in a strip structure, one side of each oven storeroom 41 is provided with a groove 411, one side of each oven storeroom 41 opposite to the groove 411 is provided with a raised strip 412, each groove 411 and each raised strip 412 extend along the length direction of each oven storeroom 41, and adjacent oven storerooms 41 are connected end to end through the raised strip 412 of one of the oven storerooms and the groove 411 of the other of the oven storerooms, so that the baking room side walls extending along the horizontal direction on each oven storeroom 4 are formed. Set up like this, when the roast room lateral wall is heated, thereby be heated the inflation and extrude each other between each oven storehouse board 41, be the grafting structure based on sand grip 412 and recess 411, not only satisfied the stable supporting effect of roast room lateral wall, moreover because each oven storehouse board 41 all can the thermal energy, and when oven storehouse board 41 was heated, adjacent oven storehouse board 41 was kept away from each other to avoid certain local stress concentration and the damage of roast room lateral wall.

It will be appreciated that the curing barn 4 can be an oval structure, a rectangular parallelepiped structure or a circular structure. In this embodiment, preferably, roast room 4 selects the cuboid structure, and four roast room lateral walls of roast room 4 are all through a plurality of oven storehouse board 41 constitutes, mutual fixed connection between roast room 4's the adjacent roast room lateral wall to guarantee roast room 4's firm effect, do benefit to each roast room lateral wall and independently install and dismantle simultaneously, improved maintenance efficiency.

As a further preferred embodiment: the width of recess 411 subtracts the width of sand grip 412 is greater than 1mm to guarantee to have great clearance between the oven storehouse board 41, like this, when roast room 4 is heated the thermal expansion, constitute roast room 4's unit (be oven storehouse board 41) inflation back, can not lead to roast room 4 to warp because of being heated the mutual extrusion of thermal expansion between the adjacent oven storehouse board 41, thereby prolonged roast room 4's life.

As a further preferred embodiment: referring to fig. 8 and 9, the baking room 4 further includes a rectangular parallelepiped frame 42, the rectangular parallelepiped frame 42 has a horizontally disposed mounting bar 421, the oven storage plates 41 are provided with fixing members 422 toward one side of the interior of the baking room 4, the fixing members 422 are provided with positioning grooves 423, and during installation, the positioning grooves 423 are adapted to slide to the mounting bar 421 along the horizontal direction, so that the protruding strips 412 of one of the adjacent oven storage plates 41 are inserted into the grooves 411 of the other one of the adjacent oven storage plates. Set up like this, be just contact atress between the adjacent oven storehouse board 41, when oven storehouse board 41 is heated the thermal expansion, oven storehouse board 41 can remove along the length direction of mounting bar 421 to can avoid roast room 4 to lead to local stress too big because of the inflation, and then prolonged roast room 4's life.

As a further preferred embodiment: the mounting bars 421 protrude towards the inner side of the curing barn 4 to form supporting bars 424; the curing barn 4 further comprises a top cover 43, wherein the top cover 43 is detachably arranged on the supporting bars 424; in this manner, the top cover 43 can expand properly when heated, thereby avoiding excessive local stress on the top cover 43. The top cover 43 is connected with at least two exhaust fans 5, the two exhaust fans 5 are respectively positioned at two ends of the elliptical short shaft, and the arrangement is such that moisture is extracted through the exhaust fans 5, so that hot moisture overflowing from the heated blanks is prevented from being accumulated in the baking room 4. Also, since the fire tubes 3 are close to the center of the elliptical shape and far from the end of the major axis of the elliptical shape, the orderly internal circulation of the gas of the curing barn 4 can be facilitated by providing two exhaust fans 5 at both ends of the minor axis of the elliptical shape. In addition, it should be noted that, because the adjacent oven storage plates 41 are inserted into the groove 411 of the other one through the protruding strip 412 of one, a gap exists between the adjacent oven storage plates 41, which is beneficial to discharging hot moisture in the baking room 4. Besides, referring to fig. 7, in order to avoid excessive local stress of the oven storage plate 41, the bottom wall of the groove 411 is provided with a plurality of through holes 413 communicated with the accommodating cavity, and the through holes 413 are used for resisting thermal expansion and cold contraction.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a spiral racetrack oven which characterized in that: the spiral racetrack oven comprises a baking room, a guide rail, a transmission carrier, a fan part and a plurality of fire tubes for burning fuel gas to generate heat; the guide rail is circularly wound into a spiral structure along the height direction, and the outline of the top view of the spiral structure is in an oval shape; the conveying carrier is arranged along the extending direction of the guide rail and used for conveying the blank to move along the extending direction of the guide rail, the fire tubes are inserted into the spiral structure along the height direction and are respectively distributed on two opposite sides of the long axis of the oval shape, and the fire tubes are close to the center of the oval shape and far away from the tail end of the long axis of the oval shape; the fan component is arranged in the spiral structure and is used for guiding airflow from the center of the oval shape to two ends of the long axis of the oval shape;

2. The spiral racetrack oven of claim 1, further comprising: roast room is the cuboid structure, and four roast room lateral walls in roast room are all through a plurality of the oven storehouse board constitutes, mutual fixed connection between the adjacent roast room lateral wall in roast room.

3. The spiral racetrack oven of claim 1, further comprising: the width of the groove minus the width of the convex strip is larger than 1 mm.

4. The spiral racetrack oven of claim 1, further comprising: roast room still includes the cuboid frame, the cuboid frame has the mounting bar that the level was placed, the oven reservoir board orientation one side of roast room inside is equipped with the mounting, the mounting is equipped with the constant head tank, during the installation, each the constant head tank is suitable for along the horizontal direction cunning to the mounting bar to one of them sand grip and another person's recess are pegged graft between the messenger adjacent oven reservoir board.

5. The spiral racetrack oven of claim 4, further comprising: the mounting bars are protruded towards the inner side close to the curing barn to form supporting bars; the curing barn also comprises a top cover, and the top cover is detachably arranged on the supporting bars; the top cover is connected with at least two exhaust fans, and the two exhaust fans are respectively positioned at two ends of the elliptical short shaft.

6. The spiral racetrack oven of claim 1, further comprising: the guide rail comprises an inner ring and an outer ring, the outer contours of the inner ring and the outer ring in the top view are both in an oval shape, the inner ring spirally surrounds upwards along the vertical height direction, then spirally surrounds outwards along the horizontal direction, and then spirally surrounds downwards along the vertical direction to form the outer ring; the fire tubes are inserted into the inner ring and the outer ring.

7. The spiral racetrack oven of claim 1, further comprising: the fan component comprises an impeller, an air guide pipe and a plurality of air outlet pipes communicated with the air guide pipe, the impeller is installed in the center of the oval shape and used for introducing airflow into the air guide pipe, and the air outlet pipes are inserted into the spiral structure in the height direction.

8. The spiral racetrack oven of claim 7, further comprising: the air outlet pipes are respectively arranged at two ends of the oval long shaft;

9. The spiral racetrack oven of claim 7, further comprising: it is a plurality of it is equipped with a plurality of air-out side openings to go out the tuber pipe, it is a plurality of the air-out side opening is followed the length direction of going out the tuber pipe and/or the circumference interval ground that goes out the tuber pipe distributes, it is Y type structure to go out the tuber pipe.

10. The spiral racetrack oven of claim 1, further comprising: the fire tube is provided with a plurality of ignition holes which are distributed at intervals along the length direction of the fire tube and/or the circumferential direction of the fire tube;