Heating structure of steaming and baking machine

Abstract

The invention discloses a heating structure of a steaming and baking machine, and relates to the technical field of food processing, the heating structure comprises a machine body, a separation structure, a conveying belt for conveying materials and a vertical jet flow air curtain for providing jet flow in the vertical direction are arranged in the machine body, and the separation structure divides the interior of the machine body into a steaming and baking area I and a steaming and baking area II; hot air circulating mechanisms for heating and circularly blowing cold air are arranged at the tops of the steaming and baking area I and the steaming and baking area II, and the two hot air circulating mechanisms are communicated with a first array inclined jet mechanism and a second array inclined jet mechanism respectively; the first array inclined jet flow mechanism and the second array inclined jet flow mechanism generate inclined jet flow and horizontal airflow to heat materials, the core feature of the inclined jet flow is that initial momentum is decomposed into a normal component and a tangential component, and the jet flow spreads in the tangential direction after impacting the surface of the materials at an inclined angle; compared with existing jet flow in the vertical direction, the heating area of the surface is greatly increased, and the material surface is heated evenly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of food processing technology, in particular to a heating structure of a steaming and baking machine. BACKGROUND

[0002] With the gradual attention to diet health, people pursue zero-addition steaming and baking food, which eliminates chemical additives (leavening agent, preservative, pigment, etc.) while ensuring the taste and color of food, and realizes zero-addition steaming and baking food through equipment innovation, process reconstruction, and natural replacement technology.

[0003] At present, many steaming and baking machines on the market realize the rapid coloring of the surface of zero-addition food by combining vertical airflow with horizontal airflow to color the food quickly, but this steaming and baking coloring mode has great disadvantages, especially for coloring objects with uneven thickness, which often causes local overheating spots due to rapid vertical jet flow, and because the material thickness is uneven, the thin parts have already browned or even been pasted, and the thick parts have not been colored. In addition, for some fragile or easily deformed materials (such as dough, fish fillets, cake crusts, etc.), the vertical airflow impact is too large, causing the material surface to break and collapse. In addition, the industrial steaming and baking machines (tunnel type or spiral type) on the market generally have two steaming and baking zones. Due to the transmission of the middle conveying belt, the two zones cannot be sealed, and heat is transferred between the two zones through airflow. For some materials that require low-temperature steaming in the first steaming and baking zone and high-temperature steaming in the second steaming and baking zone, it is difficult to meet the use requirements due to the heat transfer between the two zones. SUMMARY

[0004] The purpose of the present application is to provide a heating structure of a steaming and baking machine, which solves the technical problems raised in the background art.

[0005] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0006] A heating structure of a steaming and baking machine, comprising a machine body, a partition structure, a conveying belt for conveying materials, and a vertical jet air curtain for providing vertical jet flow are arranged in the machine body, the partition structure divides the machine body into a steaming and baking zone I and a steaming and baking zone II, the top of the steaming and baking zone I and the steaming and baking zone II are provided with a hot air circulation mechanism for heating and circulating the cold air, the two hot air circulation mechanisms are respectively communicated with a first array of inclined jet flow mechanisms and a second array of inclined jet flow mechanisms, the first array of inclined jet flow mechanisms and the second array of inclined jet flow mechanisms both blow hot air obliquely to form jet flow to the surface of the materials, the jet flow of the first array of inclined jet flow mechanisms counter-currently convects heat with the materials, and the jet flow of the second array of inclined jet flow mechanisms co-currently convects heat with the materials.

[0007] The partition structure includes an upper partition cavity and a lower partition plate arranged opposite each other inside the machine body. The upper partition cavity is fixed inside the machine body by a fixing seat. The steaming and baking zone 1 and the steaming and baking zone 2 are symmetrically arranged about the lower partition plate. Two guide plates are symmetrically inclined at the top of the lower partition plate. The vertical jet air curtain is located between the first array inclined jet mechanism and the upper partition cavity, and between the second array inclined jet mechanism and the upper partition cavity.

[0008] As a preferred embodiment of the present invention, the hot air circulation mechanism includes a hot air circulation fan disposed at the top of the steam-baking zone 1 or the steam-baking zone 2, the hot air circulation fan being connected to a preheating cavity disposed in the steam-baking zone 1 or the steam-baking zone 2, and the first array inclined jet mechanism and the second array inclined jet mechanism being respectively connected to the corresponding preheating cavity.

[0009] As a preferred embodiment of the present invention, the first array tilted jet mechanism and the second array tilted jet mechanism have the same structure. The first array tilted jet mechanism includes at least one set of tilted jet units, which are disposed on a fixed base. Each set of tilted jet units includes at least one jet air distribution plate and at least one horizontal support plate. The horizontal support plate is disposed on the fixed base, and the jet air distribution plate is disposed on the horizontal support plate. Multiple sets of tilted jet units are arranged in parallel along the conveying direction of the conveyor belt, and the tilted jet directions of adjacent sets of tilted jet units are parallel.

[0010] As a preferred embodiment of the present invention, the angle between the first array tilting jet mechanism and the running direction of the conveyor belt is an acute angle, and the angle range of the acute angle is 30°~60°.

[0011] As a preferred embodiment of the present invention, the angle between the second array tilting jet mechanism and the running direction of the conveyor belt is an obtuse angle, and the angle range of the obtuse angle is 120°~150°.

[0012] As a preferred embodiment of the present invention, in the direction parallel to the arrangement of the multiple sets of inclined jet units, two horizontal support plates on adjacent inclined jet units form an inclined trumpet-shaped first tapering structure, and in the direction perpendicular to the arrangement of the multiple sets of inclined jet units, two jet distribution plates and horizontal support plates form a trumpet-shaped second tapering structure, and the tapering structures are all located at the inlet of the inclined jet units.

[0013] As a preferred embodiment of the present invention, the upper partition cavity includes a first partition plate and a second partition plate fixedly disposed on a fixed base, and the first partition plate and the second partition plate are symmetrically disposed. The vertical jet air curtain is disposed between the first partition plate and the first array inclined jet mechanism and between the second partition plate and the second array inclined jet mechanism. The width of the vertical jet air curtain is greater than the width of the conveyor belt. A third tapering structure is disposed on the vertical jet air curtain both along the direction perpendicular to the width of the conveyor belt and along the direction parallel to the width of the conveyor belt, and the third tapering structure is trumpet-shaped.

[0014] As a preferred embodiment of the present invention, the conveyor belt is a spiral conveyor belt or a tunnel conveyor belt.

[0015] As a preferred embodiment of the present invention, the upper surface of the guide plate is provided with a plurality of triangular protrusions arranged in parallel.

[0016] As a preferred embodiment of the present invention, each of the triangular protrusions is provided with a plurality of anti-wind grooves.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] This invention heats materials by generating inclined jets and horizontal airflows through a first array of inclined jet mechanisms and a second array of inclined jet mechanisms. The core feature of the inclined jet is that the initial momentum is decomposed into normal and tangential components. The jet impacts the material surface at an inclined angle and then spreads tangentially. Compared with existing vertical jets, this significantly increases the surface heating area, resulting in uniform heating of the material surface. Furthermore, the inclined jets are directed in opposite directions, heating the material from all directions. In addition, a vertical jet air curtain is used to isolate the first and second steaming / baking zones, which can adapt to the needs of various material product formulations, such as those with large temperature differences and high humidity. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the heating structure of a steam oven (with a spiral conveyor belt) provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the heating structure of a steam oven (the conveyor belt is a tunnel conveyor belt) provided in an embodiment of the present invention;

[0022] Figure 3 A cross-sectional schematic diagram of the first array tilted jet mechanism and the second array tilted jet mechanism is provided for embodiments of the present invention;

[0023] Figure 4 Provided for embodiments of the present invention Figure 3 A cross-sectional view at point AA shown in the diagram;

[0024] Figure 5 A cross-sectional view of the vertical jet air curtain in the steaming and baking zone is provided for an embodiment of the present invention;

[0025] Figure 6 A cross-sectional view of the vertical jet air curtain in the steam-baking zone of this invention is provided for an embodiment of the present invention.

[0026] Figure 7 A cross-sectional view of a vertical jet air curtain with the conveyor belt's forward direction as a reference is provided for an embodiment of the present invention.

[0027] The labels in the diagram represent the following:

[0028] 1. Separated structure; 2. Steaming and baking zone 1; 3. Hot air circulation mechanism; 4. First array inclined jet mechanism; 5. Second array inclined jet mechanism; 6. Conveyor belt; 7. Vertical jet air curtain; 8. Steaming and baking zone 2;

[0029] 101. Upper partition chamber; 102. Lower partition plate; 103. Fixing seat; 104. Guide plate; 105. First partition plate; 106. Second partition plate; 107. Triangular protrusion strip; 108. Counteracting air duct; 301. Hot air circulation fan; 302. Preheating chamber; 401. Inclined jet unit; 402. Jet air distribution plate; 403. Horizontal support plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 7As shown, the present invention provides a heating structure for a steam oven, including a body, a partition structure 1, a conveyor belt 6 for conveying materials, and a vertical jet air curtain 7 for providing vertical jets. The partition structure 1 divides the interior of the body into a steam oven zone 2 and a steam oven zone 8. The top of both the steam oven zone 2 and the steam oven zone 8 is provided with a hot air circulation mechanism 3 for heating and circulating cold air. The two hot air circulation mechanisms 3 are respectively connected to a first array inclined jet mechanism 4 and a second array inclined jet mechanism 5. Both the first array inclined jet mechanism 4 and the second array inclined jet mechanism 5 blow hot air at an angle to form jets to the surface of the materials. The jet fluid of the first array inclined jet mechanism 4 convects heat with the materials in the opposite direction, while the jet fluid of the second array inclined jet mechanism 5 convects heat with the materials in the same direction, ensuring uniform coloring of the materials.

[0032] The partition structure 1 includes an upper partition cavity 101 and a lower partition plate 102 arranged opposite to each other in the machine body. The upper partition cavity 101 is fixed in the machine body by a fixing seat 103. The steaming and baking zone 2 and the steaming and baking zone 8 are symmetrically arranged about the lower partition plate 102. Two guide plates 104 are symmetrically inclined at the top of the lower partition plate 102. The vertical jet air curtain 7 is located between the first array inclined jet mechanism 4 and the upper partition cavity 101 and between the second array inclined jet mechanism 5 and the upper partition cavity 101.

[0033] The hot air circulation mechanism 3 includes a hot air circulation fan 301 located at the top of the steam-baking zone 2 or the steam-baking zone 8. The hot air circulation fan 301 is connected to a preheating cavity 302 located in the steam-baking zone 2 or the steam-baking zone 8. The first array inclined jet mechanism 4 and the second array inclined jet mechanism 5 are respectively connected to the corresponding preheating cavity 302.

[0034] The conveyor belt 6 is either a spiral conveyor belt or a tunnel conveyor belt.

[0035] exist Figure 5 and Figure 6 In the diagram, A represents the width direction of conveyor belt 6.

[0036] In use, materials are conveyed via conveyor belt 6. The upper partition chamber 101 and the lower partition plate 102 separate the steaming and baking zone 2 and the steaming and baking zone 8. The conveying direction is as follows: Figure 1 and Figure 2 As shown in the diagram, the material passes through the first steaming and baking zone 2 and the second steaming and baking zone 8 in sequence. The hot air is circulated by the hot air circulation fan 301 to heat the material in the form of hot convection. After the hot air exchanges heat with the material, the cooled air enters the preheating chamber 302 in the first steaming and baking zone 2 and the second steaming and baking zone 8 through the hot air circulation fan 301 for heating.

[0037] The heated air enters the first array tilted jet mechanism 4 and the second array tilted jet mechanism 5 through the hot air circulation fan 301, changing the original vertical airflow into a high-speed tilted jet to rapidly heat and evenly color the material. Then, it is converted into a horizontal airflow through the air duct (the air duct is an existing technology in steam ovens, capable of generating horizontal airflow, the technical principle of which will not be elaborated here) to heat the material. The core feature of the tilted jet is that the initial momentum is decomposed into normal and tangential components. The normal component determines the impact strength and penetration ability, while the tangential component determines the spread range and direction of the jet on the wall. This allows the jets generated by the first array tilted jet mechanism 4 and the second array tilted jet mechanism 5 to rapidly and evenly heat the material, avoiding the problem of hot spots due to uneven heating in certain areas.

[0038] The vertical jet air curtain 7 (existing technology, the technical principle will not be elaborated here) emits jets perpendicular to the conveying direction of the conveyor belt 6 to form an air curtain. When the hot air circulated by the hot air circulation fan 301 (existing technology, the technical principle will not be elaborated here) in the first steam baking zone 2 passes through the air curtain formed by the vertical jet air curtain 7, the hot air collides with the air curtain. The hot air is blown from the air curtain to the corresponding guide plate 104, which turns the hot air into a decelerating wall jet. Due to the small gap and high resistance on the conveyor belt 6, when the decelerating wall jet reaches the lower surface of the conveyor belt 6, the wind speed drops to zero. This prevents the hot air in the first steam baking zone 2 from flowing into the second steam baking zone 8, so that the first steam baking zone 2 and the second steam baking zone 8 cannot transfer heat and moisture through airflow. That is, it avoids the temperature and humidity of the first steam baking zone 2 and the second steam baking zone 8 from affecting each other, so as to adapt to the needs of various material product formulations (especially requiring a steam baking environment with a large temperature difference and a large humidity difference between the first steam baking zone 2 and the second steam baking zone 8).

[0039] In this embodiment, the conveyor belt 6 is either a spiral conveyor belt or a tunnel conveyor belt (both types of conveyor belt 6 are existing technologies, and their technical principles will not be elaborated here). Both are existing conveying technologies, and their technical principles will not be elaborated here. When the conveyor belt 6 is a spiral conveyor belt, the starting end and the ending end of the conveyor belt 6 are located in the first steaming and baking zone 2 and the second steaming and baking zone 8, respectively. The material in the first steaming and baking zone 2 is spirally raised by the conveyor belt 6 to the gap between the upper partition cavity 101 and the lower partition plate 102, and then enters the second steaming and baking zone 8, and finally spirals down. When the conveyor belt 6 is a tunnel conveyor belt, it is directly conveyed from the first steaming and baking zone 2 to the second steaming and baking zone 8, passing through the gap between the upper partition cavity 101 and the lower partition plate 102. The positions of the hot air circulating fan 301 and the preheating cavity 302 are adapted according to the actual situation to ensure that the corresponding functions are realized.

[0040] The jet direction of the first array inclined jet mechanism 4 is opposite to the material movement direction, i.e., reverse convection, which significantly increases the relative velocity and the heat transfer coefficient, thereby improving the heat transfer efficiency. The second array inclined jet mechanism 5 has a jet fluid and the conveyed material that convect heat in the same direction, heating the other side of the material and making the material surface uniformly heated in all directions.

[0041] The first array tilted jet mechanism 4 and the second array tilted jet mechanism 5 have the same structure. The first array tilted jet mechanism 4 includes at least one set of tilted jet units 401. The tilted jet units 401 are mounted on the fixed base 103. Each set of tilted jet units 401 includes at least one jet distribution plate 402 and at least one horizontal support plate 403. The horizontal support plate 403 is mounted on the fixed base 103, and the jet distribution plate 402 is mounted on the horizontal support plate 403. Multiple sets of tilted jet units 401 are arranged in parallel along the conveying direction of the conveyor belt 6, and the tilted jet directions of two adjacent sets of tilted jet units 401 are parallel.

[0042] The inclined jet unit 401 forms a jet by blowing air at an angle, and the jet directions of multiple inclined jet units 401 are parallel, ensuring uniform heating of the material.

[0043] The angle between the first array tilting jet mechanism 4 and the running direction of the conveyor belt 6 is called an acute angle, and the angle range of the acute angle is 30°~60°.

[0044] The angle between the second array tilting jet mechanism 5 and the running direction of the conveyor belt 6 is an obtuse angle, with the angle range being 120°~150°.

[0045] The jet generated by the first array tilted jet mechanism 4 can be blown onto the material surface at an inclined angle.

[0046] In the direction parallel to the arrangement of multiple sets of inclined jet units 401, two horizontal support plates 403 on adjacent inclined jet units 401 form an inclined trumpet-shaped first tapering structure. In the direction perpendicular to the arrangement of multiple sets of inclined jet units 401, two jet distribution plates 402 and horizontal support plates 403 form a trumpet-shaped second tapering structure, and the tapering structures are all set at the inlet of the inclined jet unit 401.

[0047] The trumpet-shaped first and second tapering structures can smoothly guide the airflow and reduce the pressure loss caused by the sudden contraction at the inlet of the inclined jet unit 401. Figure 3 The region referred to by Q is the first tapering structure. Figure 4 The area between the two jet air distribution plates 402 and the horizontal support plate 403 is the third tapering structure.

[0048] The upper partition cavity 101 includes a first partition plate 105 and a second partition plate 106 fixedly mounted on the fixed base 103, and the first partition plate 105 and the second partition plate 106 are symmetrically arranged. The vertical jet air curtain 7 is arranged between the first partition plate 105 and the first array inclined jet mechanism 4 and between the second partition plate 106 and the second array inclined jet mechanism 5. The width of the vertical jet air curtain 7 is greater than the width of the conveyor belt 6. A third tapering structure is provided on the vertical jet air curtain 7 along both the direction perpendicular to the width of the conveyor belt and the direction parallel to the width of the conveyor belt 6, and the third tapering structure is trumpet-shaped.

[0049] Third tapering structure ( Figure 5 The region shown is similar in structure to the first and second tapered structures, and is flared in shape.

[0050] This ensures that the air curtain generated by the vertical jet air curtain 7 is used to cover the material conveyed on the conveyor belt 6, thereby preventing the temperature and humidity of the steam baking zone 2 and the steam baking zone 8 from affecting each other.

[0051] The third tapering structure can reduce the resistance of circulating hot air when it passes through the vertical jet curtain 7.

[0052] Multiple triangular protrusions 107 are arranged in parallel on the upper surface of the guide plate 104.

[0053] When hot air passes through the vertical jet air curtain 7 and reaches the guide plate 104, the guide plate 104 is tilted, causing the hot air to collide with its surface and move away from the guide plate 104 at a symmetrical angle (referring to the principle of light reflection), thus becoming a decelerating wall jet. This decelerating wall jet needs to travel a longer distance before contacting the conveyor belt 6, consuming more kinetic energy and further reducing the kinetic energy of the decelerating wall jet when it contacts the lower surface of the conveyor belt 6. Secondly, by setting... The multiple triangular protrusions 107 are arranged such that when hot air comes into contact with them, one side of each triangular protrusion 107 (i.e., a triangular prism) is in contact with the surface of the guide plate 104, while the other two sides are inclined and symmetrical. The hot air is guided by the inclined surfaces of the triangular protrusions 107, causing the air guided on adjacent triangular protrusions 107 to move towards each other. This allows them to collide with each other and further consume kinetic energy, thus improving the isolation effect on temperature and humidity between the steam oven zone 2 and the steam oven zone 8.

[0054] Each triangular protrusion 107 has multiple air-dissipating grooves 108.

[0055] When hot air enters the counteracting air duct 108, it will move in the opposite direction to leave the counteracting air duct 108, thereby coming into contact with and colliding with subsequent hot air, further consuming the kinetic energy of the hot air.

[0056] Furthermore, a spiral groove can also be provided inside the offset air duct 108, so that after the hot air enters the offset air duct 108, some of the hot air will move in the spiral groove, extending the movement distance and thus increasing the kinetic energy consumption of the hot air.

[0057] Furthermore, the offset air duct 108 is conical, which causes the hot air to collide with the inner wall of the offset air duct 108 after entering it and then move again, forming multiple streams of hot air in different directions. This causes the hot air to come into contact with each other in the offset air duct 108 or at the opening of the offset air duct 108, further increasing the kinetic energy consumption of the hot air.

[0058] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A heating structure of a steam oven, comprising a body, characterized in that, The machine body is provided with a separation structure (1), a conveying belt (6) for conveying materials and a vertical jet air curtain (7) for providing vertical jet flow, the separation structure (1) separates the machine body into a steaming and baking area (2) and a steaming and baking area (8), the top of the steaming and baking area (2) and the steaming and baking area (8) is provided with a hot air circulation mechanism (3) for heating and circulating blowing of cold air, the two hot air circulation mechanisms (3) are respectively communicated with a first array inclined jet flow mechanism (4) and a second array inclined jet flow mechanism (5), the first array inclined jet flow mechanism (4) and the second array inclined jet flow mechanism (5) are both inclined to blow hot air to form jet flow to the surface of the materials, the jet flow fluid of the first array inclined jet flow mechanism (4) counterflows with the materials, and the jet flow fluid of the second array inclined jet flow mechanism (5) coflows with the materials. The separation structure (1) comprises an upper separation cavity (101) and a lower separation plate (102) oppositely arranged in the machine body, the upper separation cavity (101) is fixed in the machine body through a fixing seat (103), the steaming and baking area (2) and the steaming and baking area (8) are symmetrically arranged about the lower separation plate (102), the top of the lower separation plate (102) is symmetrically and obliquely provided with two guide plates (104), and the vertical jet air curtain (7) is located between the first array inclined jet flow mechanism (4) and the upper separation cavity (101) and between the second array inclined jet flow mechanism (5) and the upper separation cavity (101).

2. The heating structure of the steaming and baking machine according to claim 1, wherein, The hot air circulation mechanism (3) comprises a hot air circulation fan (301) arranged at the top of the steaming and baking area (2) or the steaming and baking area (8), the hot air circulation fan (301) is communicated with a preheating cavity (302) arranged in the steaming and baking area (2) or the steaming and baking area (8), and the first array inclined jet flow mechanism (4) and the second array inclined jet flow mechanism (5) are respectively communicated with corresponding preheating cavities (302).

3. The heating structure of the steaming and baking machine according to claim 1, wherein, The first array inclined jet flow mechanism (4) and the second array inclined jet flow mechanism (5) are the same in structure, the first array inclined jet flow mechanism (4) comprises at least one group of inclined jet flow units (401), the inclined jet flow units (401) are arranged on the fixing seat (103), each group of the inclined jet flow units (401) comprises at least one jet flow air distribution plate (402) and at least one horizontal support plate (403), the horizontal support plate (403) is arranged on the fixing seat (103), the jet flow air distribution plate (402) is arranged on the horizontal support plate (403), a plurality of groups of the inclined jet flow units (401) are arranged in parallel along the conveying direction of the conveying belt (6), and the inclined jet flow directions of adjacent two groups of the inclined jet flow units (401) are parallel.

4. The heating structure of the steaming and roasting machine according to claim 1, wherein, The angle between the first array inclined jet flow mechanism (4) and the conveying direction of the conveying belt (6) is an acute angle, and the angle range of the acute angle is 30°-60°.

5. The heating structure of the steaming and roasting machine according to claim 1, wherein, The angle between the second array inclined jet flow mechanism (5) and the conveying direction of the conveying belt (6) is an obtuse angle, and the angle range of the obtuse angle is 120°-150°.

6. The heating structure of a steaming and roasting machine according to claim 3, wherein, In the direction parallel to the arrangement direction of the plurality of groups of the inclined jet flow units (401), the two horizontal support plates (403) on adjacent inclined jet flow units (401) form a first tapered structure in the shape of an inclined horn, and in the direction perpendicular to the arrangement direction of the plurality of groups of the inclined jet flow units (401), the two jet flow air distribution plates (402) and the horizontal support plates (403) form a second tapered structure in the shape of a horn, and the tapered structures are arranged at the entrances of the inclined jet flow units (401).

7. The heating structure of a steam roaster according to claim 1, wherein The upper partition cavity (101) comprises a first partition plate (105) and a second partition plate (106) fixedly arranged on a fixed seat (103), and the first partition plate (105) and the second partition plate (106) are symmetrically arranged, the vertical jet flow air curtain (7) is arranged between the first partition plate (105) and the first array inclined jet flow mechanism (4) and between the second partition plate (106) and the second array inclined jet flow mechanism (5), the width of the vertical jet flow air curtain (7) is greater than the width of the conveying belt (6), and a third tapered structure is arranged on the vertical jet flow air curtain (7) in the direction perpendicular to the width direction of the conveying belt (6) and in the direction parallel to the width direction of the conveying belt (6), and the third tapered structure is in the shape of a horn.

8. The heating structure of a steam roaster according to claim 1, wherein The conveying belt (6) is a spiral conveying belt or a tunnel conveying belt.

9. The heating structure of a steam roaster according to claim 1, wherein The upper surface of the flow guide plate (104) is parallelly provided with a plurality of triangular protruding strips (107).

10. The heating structure of a steaming and roasting machine according to claim 9, wherein, A plurality of wind offset grooves (108) are formed in each triangular protruding strip (107).

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