Drying oven tuyere structure

Abstract

The utility model discloses a drying oven tuyere structure which comprises a tuyere shell internally provided with an air cavity, an air inlet and an air outlet are formed in the tuyere shell, an air uniformizing plate and an air mixing plate are arranged in the tuyere shell, and the air cavity is divided into a first air cavity, a second air cavity and a third air cavity by the air uniformizing plate and the air mixing plate. The air inlet is communicated with the first air cavity, and the air outlet is communicated with the third air cavity; a plurality of mesh holes are formed in the air uniformizing plate, the hole density of the mesh holes is gradually increased in the length direction of the air uniformizing plate, and the hole density of the mesh holes close to one side of the air inlet is smaller than that of the mesh holes in the other side of the air uniformizing plate; an air outlet gap is formed in the air mixing plate, backflow baffles are arranged on the portions, on the two sides of the air outlet gap, of the air mixing plate, and a flow guide slit is formed between the two backflow baffles. The air uniformizing plate and the air mixing plate are arranged in the air cavity, the air outlet temperature and the air outlet speed are controlled in the air cavity, uniform output of hot air is achieved, and heat efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of ovens, in particular to an oven air nozzle structure. Background Art

[0002] With the rapid development of the lithium battery industry, the demand for the technical level of production equipment is increasing day by day, reducing equipment costs, improving production efficiency, and increasing the competitive advantage in the same industry.

[0003] In the existing film pulling air nozzle equipment with a static pressure chamber, the drying hot air cannot directly enter the air nozzle and needs to be mixed in the static pressure chamber. There is a problem of uneven pressure distribution in the static pressure chamber. The air outlet temperature in the first half near the air inlet is relatively high, and the uniformity of the overall air outlet temperature and air outlet speed of the oven air nozzle becomes poor. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an oven air nozzle structure. By setting an air distribution plate, a diversion groove and a mixing plate in the air cavity, the hot air passes through the gradually denser mesh holes on the air distribution plate, so that the hot air reaching the inside has the same heat. After passing through the diversion plate and mixing the hot air, it is evenly output from the air holes on both sides of the mixing plate. Finally, the hot air is evenly output from the air outlet of the air outlet plate. Control the air outlet temperature and air outlet speed in the air cavity of the air nozzle, realize the uniform output of hot air, improve the thermal efficiency, reduce energy loss, and increase the stability of the system.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An oven air nozzle structure, including an air nozzle housing with an air cavity inside. An air inlet and an air outlet are arranged on the air nozzle housing. An air distribution plate and a mixing plate are arranged inside the air nozzle housing. The air distribution plate and the mixing plate divide the air cavity into a first air cavity, a second air cavity and a third air cavity. The air inlet is communicated with the first air cavity, and the air outlet is communicated with the third air cavity. A number of mesh holes are arranged on the air distribution plate. The first air cavity is communicated with the second air cavity through the mesh holes. The hole density of the mesh holes gradually increases along the length direction of the air distribution plate, and the hole density of the mesh holes on the side close to the air inlet is less than that of the mesh holes on the other side. An air outlet gap is arranged on the mixing plate, and a reflux baffle is arranged on both sides of the mixing plate at the air outlet gap. A diversion slit is formed between the two reflux baffles. The second air cavity is communicated with the third air cavity through the diversion slit.

[0007] As a further improvement of the above technical solution, the air outlet gap is located in the middle of the mixing plate and is arranged along the length direction of the mixing plate, and the air outlet gap is arranged in a vertical dislocation with the mesh holes on the air distribution plate.

[0008] As a further improvement of the above technical solution, a uniform air channel is connected to the bottom of the air mixing plate. The uniform air channel is used to cover the air outlet gap. A plurality of uniform air holes are provided on the side wall of the uniform air channel. The depth of the uniform air channel is 10 - 22 mm, and the gap lengths between the two side walls of the uniform air channel and the housing are both 6 - 10 mm.

[0009] As a further improvement of the above technical solution, the return baffle includes a connecting plate and an extension plate. The connecting plate is connected to the edge of the air outlet gap on the upper part of the air mixing plate. The gap between the two connecting plates and the air outlet gap form the diversion slit. The extension plate is connected to the top of the connecting plate and extends in a direction away from the air outlet gap; a return air gap is formed between the side of the extension plate facing away from the connecting plate and the side wall of the air nozzle housing; the mesh holes on the air distribution plate are located directly above the return air gap; the extension plate is perpendicular to the connecting plate, and the width of the extension plate is 18 - 20 mm.

[0010] As a further improvement of the above technical solution, the bottom of the air nozzle housing is open, and the opening forms the air outlet. The opening is connected with an air outlet plate. A plurality of air outlet holes are provided on the air outlet plate. Chamfered slopes are provided on both sides of the air outlet plate, and a plurality of the air outlet holes are also provided on the chamfered slopes.

[0011] As a further improvement of the above technical solution, a first partition plate is arranged in the air nozzle housing. The first partition plate is connected between the air distribution plate and the air outlet plate. One ends of the air mixing plate and the uniform air channel are both connected to the first partition plate. A heat preservation buffer cavity is formed between the first partition plate and the air nozzle housing. The side of the heat preservation buffer cavity close to the air inlet is flush with the side of the first air cavity close to the air inlet, and the bottom of the heat preservation buffer cavity is flush with the bottom of the third air cavity.

[0012] As a further improvement of the above technical solution, a second partition plate is arranged in the air nozzle housing. The second partition plate is connected between the air outlet plate and the air nozzle housing, and one end of the air distribution plate far from the air inlet is connected to the second partition plate. A first heat preservation cavity is formed between the second partition plate and the air nozzle housing. The bottom of the first heat preservation cavity is flush with the bottom of the third air cavity, the top of the first heat preservation cavity is flush with the top of the first air cavity, and the first heat preservation cavity is arranged on the side far from the air inlet.

[0013] As a further improvement of the above technical solution, a third partition plate is arranged in the air nozzle housing. The third partition plate is connected between the air distribution plate and the air outlet plate. One ends of the air mixing plate and the uniform air channel far from the heat preservation buffer cavity are both connected to the third partition plate. A second heat preservation cavity is formed between the third partition plate, the air nozzle housing and the second partition plate. The bottom of the second heat preservation cavity is flush with the bottom of the third air cavity, and the top of the second heat preservation cavity is flush with the bottom of the first air cavity.

[0014] As a further improvement of the above technical solution, a dense hole plate and a return flow plate are integrally formed at one end of the air distribution plate away from the air inlet. A plurality of air return holes are provided on the dense hole plate. The dense hole plate is located above the second air cavity, and the return flow plate is located above the second heat preservation cavity.

[0015] As a further improvement of the above technical solution, the top surface of the nozzle housing is an inclined surface, which slopes downward from one end of the air inlet to the other end, and the first air cavity gradually narrows from one end near the air inlet to the other end.

[0016] The beneficial effects of the present utility model are as follows: By arranging an air distribution plate, a mixing air plate and an air equalizing groove in the air cavity of the nozzle, the hot air passes through the holes on the air distribution plate that gradually become denser from loose. By controlling the air volume, the hot air reaching the inside has a consistent heat. And after passing through the return baffle and mixing the hot air, it is evenly output from the air holes on both sides of the air equalizing groove. Finally, the hot air is evenly output from the air outlet of the air outlet plate. By controlling the air outlet temperature and air outlet speed in the air cavity of the nozzle, the uniform output of hot air is realized, the thermal efficiency is improved, the energy loss is reduced, and the stability of the system is increased. The temperature and air volume of the hot air blown out by the nozzle are more uniform and consistent, thereby optimizing the drying effect of products such as diaphragms. Description of the Drawings

[0017] The following further illustrates the present utility model in conjunction with the drawings and embodiments.

[0018] Figure 1 is a schematic diagram of the structure of the oven nozzle of the present utility model;

[0019] Figure 2 is Figure 1 an enlarged schematic diagram of part A in

[0020] Figure 3 is a cross-sectional view of the structure of the oven nozzle of the present utility model;

[0021] Figure 4 is a schematic diagram of the structure of the heat preservation buffer cavity in the present utility model;

[0022] Figure 5 is a schematic diagram of the structure of the first heat preservation cavity and the second heat preservation cavity in the present utility model;

[0023] Figure 6 is a top view of the air distribution plate in the structure of the oven nozzle of the present utility model;

[0024] Figure 7 is an internal structure schematic diagram of the oven nozzle structure of the present utility model;

[0025] Figure 8 is Figure 3 a schematic diagram of the A-A cross-section in

[0026] Figure 9 It is a schematic diagram of the hot air flow direction of the hot air nozzle structure of the utility model oven.

[0027] Explanation of reference numerals: 1. Air nozzle housing; 11. Air inlet; 12. Inclined surface; 2. Air outlet plate; 21. Chamfered inclined surface; 22. Air outlet holes; 3. Air distribution plate; 31. Mesh holes; 32. Dense hole plate; 33. Transition plate; 34. Return plate; 4. Air mixing plate; 41. Connecting plate; 42. Extension plate; 43. Flow guiding slit; 5. Air equalizing hood; 51. Air equalizing holes; 6. First partition; 7. Third partition; 8. Second partition; 001. First air cavity; 002. Second air cavity; 003. Third air cavity; 004. Heat preservation buffer cavity; 005. Second heat preservation cavity; 006. Air pressure equalization area; 007. First heat preservation cavity. Detailed implementation manners

[0028] The concept, specific structure and technical effects of the utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all embodiments. Based on the embodiments of the utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the utility model. In addition, all connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to the specific implementation situation. For example, fixed connection / fixed installation can select screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting, etc. as needed, and detachable connection can select screw connection, bolt connection, threaded connection, snap connection, mortise and tenon connection, magic tape connection, etc. as needed. Each technical feature in the creation of the utility model can be combined interactively without conflict.

[0029] Please refer to Figure 1 , the utility model provides an oven air nozzle structure, including an air nozzle housing 1. The air nozzle housing 1 is in a long strip shape and is hollow inside, and its interior is an air cavity. The air nozzle housing 1 includes two end faces, and an air inlet 11 is provided on one of the end faces, which can be connected to a air supply device to send hot air into the air nozzle.

[0030] Among them, referring to Figure 1 and Figure 2, the bottom of the air nozzle housing 1 is open, and the opening forms an air outlet. The opening is connected with an air outlet plate 2. The air outlet plate 2 and the air nozzle housing 1 can be integrally formed. The air outlet plate 2 is evenly provided with a plurality of air outlet holes 22. Further, chamfered inclined surfaces 21 are provided on both sides of the air outlet plate 2, and a row of the air outlet holes 22 is also provided on the chamfered inclined surfaces 21. By providing a row of air outlet holes 22 on the chamfered inclined surfaces 21, hot air is discharged from the air outlet holes 22 on the chamfered inclined surfaces 21, avoiding the situation that hot air is only discharged concentratedly from one position, resulting in local overheating or insufficiency. Moreover, hot air is discharged from the air outlet holes 22 on the chamfered inclined surfaces 21, making the wind direction inclined to increase the diffusion range of hot air, so that hot air can cover a wider area.

[0031] During installation, the oven air nozzle is docked and installed on the oven, and the air inlet 11 is aligned with the air outlet in the oven. During use, hot air is discharged from the air outlet of the oven, and the hot air passes through the air inlet 11 on it and enters the air cavity, and then is discharged from the air outlet on the air outlet plate 2. The discharged hot air dries the diaphragm, realizing the drying of the diaphragm.

[0032] Furthermore, referring to Figure 3 , Figures 7 - 9 , a wind homogenizing plate 3 and a wind mixing plate 4 are provided inside the air nozzle housing 1. The wind homogenizing plate 3 and the wind mixing plate 4 divide the air cavity into a first air cavity 001, a second air cavity 002 and a third air cavity 003. The air inlet 11 is communicated with the first air cavity 001, and the air outlet is communicated with the third air cavity 003; the hot air needs to pass through the wind homogenizing plate 3 and the wind mixing plate 4 in sequence inside the air nozzle housing 1 before reaching the air outlet plate 2, that is, the hot air enters the first air cavity 001 from the air inlet 11, enters the second air cavity 002 after being mixed by the wind homogenizing plate 3, and then enters the third air cavity 003 after being mixed by the wind mixing plate 4 and is discharged from the air outlet holes 22.

[0033] In a specific embodiment, referring to Figure 6 , a plurality of mesh holes 31 are provided on the wind homogenizing plate 3, and the hot air flows out from the mesh holes 31 on the wind homogenizing plate 3 after entering the air cavity from the air inlet 11. The mesh holes 31 are arranged from sparse to dense, and the hole density of the mesh holes 31 gradually increases along the length direction of the wind homogenizing plate 3, and the hole density of the mesh holes 31 on the side close to the air inlet 11 is smaller than that of the mesh holes 31 on the other side, that is, the mesh holes 31 on the side close to the air inlet 11 are distributed more sparsely, and the mesh holes 31 on the side far from the air inlet 11 are distributed more densely. An intensive hole plate 32 is integrally formed at one end of the wind homogenizing plate far from the air inlet, and a plurality of return air holes are provided on the intensive hole plate 32, and the hole density of the return air holes is smaller than that of the mesh holes. Due to the heat loss of the hot air during transportation, the transportation volume of the hot air is controlled by the different hole densities of the mesh holes 31. Therefore, the denser the mesh holes 31 are, the more the air volume is, making the hot air in the air nozzle reach a consistent heat.

[0034] In a specific embodiment, refer to Figures 7 - 9 The air mixing plate 4 is provided with an air outlet gap, which is located in the middle of the air mixing plate 4 and arranged along the length direction of the air mixing plate 4. The mesh holes 31 on the air uniforming plate 3 are offset from the air outlet gap in the vertical direction, thereby preventing the hot air from being discharged directly from the air outlet gap after flowing out of the mesh holes 31, and failing to complete the hot air mixing work.

[0035] Furthermore, the air mixing plate 4 is provided with a return baffle on both sides of the air outlet gap, and a guide slit 43 is formed between the two return baffles. The second air cavity 002 is connected with the third air cavity 003 through the guide slit 43. After the hot air flows out from the mesh holes 31 on the air uniforming plate 3, the hot air is mixed under the action of the air mixing plate 4 and the return baffle, and the mixed hot air enters the third air cavity 003 from the guide slit 43.

[0036] Furthermore, the return baffle includes a connecting plate 41 and an extension plate 42, wherein the connecting plate 41 is connected to the edge of the air outlet gap on the air mixing plate 4, and the gap between the two connecting plates 41 and the air outlet gap form the guide slit 43. The extension plate 42 is connected to the top of the connecting plate 41 and extends away from the air outlet gap. The extension plate 42 is arranged perpendicular to the connecting plate 41, and the width of the extension plate 42 is 18-20 mm. A return air gap is formed between the side of the extension plate 42 away from the connecting plate 41 and the side wall of the air nozzle housing 1, and the mesh 31 on the air uniforming plate 3 is located directly above the return air gap. In this way, a U-shaped structure is formed between the return baffle and the air mixing plate 4, which facilitates the return of hot air through the U-shaped structure and improves the mixing effect of the hot air. The hot air is returned to the top in the U-shaped structure for collision and mixing, and then passes through the guide slit 43 to further mix the temperature. Through collision and mixing, the temperature of the hot air is more uniform, which improves the thermal efficiency. The U-shaped structure limits the flow path and direction of the hot air, avoids large-area contact between the hot air and the surrounding environment for heat exchange, and reduces energy dissipation and loss.

[0037] In a specific embodiment, refer to Figures 7 - 9, a uniform air groove 5 is connected to the bottom of the air mixing plate 4. The uniform air groove 5 is used to cover the air outlet gap, that is, the notch of the uniform air groove 5 is communicated with the air outlet gap, and a plurality of uniform air holes 51 are arranged on the side wall of the uniform air groove 5. Specifically, the depth of the uniform air groove is 10-22 mm, and the gap lengths between the two side walls of the uniform air groove and the housing are both 6-10 mm. After the hot air flows out from the diversion slit 43, it enters the interior of the uniform air groove 5, and the mixing work of the hot air is carried out again. Then it flows out from the uniform air holes 51 on both side walls of the uniform air groove 5 and enters the third air cavity 003. Since the uniform air holes 51 are opened on both sides of the uniform groove, the hot air can be evenly dispersed to both sides, further controlling the uniformity of the overall air velocity and air volume. And the hot air flowing out from the uniform air holes 51 turns back on the inner wall of the third air cavity 003 and then flows out from the air outlet holes 22, and the mixing work of the hot air is carried out again.

[0038] In a specific embodiment, referring to Figure 3 , a first partition plate 6, a second partition plate 8 and a third partition plate 7 are arranged in the nozzle housing 1. The first partition plate 6 and the third partition plate 7 are both connected between the air distribution plate 3 and the air outlet plate 2. The air mixing plate 4 and the uniform air groove 5 are connected between the first partition plate 6 and the third partition plate 7. The second partition plate 8 is connected between the air outlet plate 2 and the nozzle housing 1, and one end of the air distribution plate 3 far from the air inlet is connected to the second partition plate 8. The space formed by enclosing the air distribution plate 3, the air mixing plate 4, the first partition plate 6 and the third partition plate 7 forms a second air cavity 002, and the space formed by enclosing the air mixing plate 4, the air outlet plate 2, the first partition plate 6 and the third partition plate 7 forms a third air cavity 003.

[0039] Referring to Figure 4 , the space enclosed by the first partition plate 6, the nozzle housing 1, the air distribution plate 3 and the air outlet plate 2 forms a heat preservation buffer cavity 004. The heat preservation buffer cavity 004 is close to the side of the air inlet 11, and the side of the heat preservation buffer cavity 004 close to the air inlet 11 is flush with the side of the first air cavity 001 close to the air inlet 11. The bottom of the heat preservation buffer cavity 004 is flush with the bottom of the third air cavity 003.

[0040] Referring to Figure 5 , the space enclosed by the second partition plate 8, the nozzle housing 1 and the air outlet plate 2 forms a first heat preservation cavity 007. The first heat preservation cavity 007 is far from the side of the air inlet 11, and the bottom of the first heat preservation cavity 007 is flush with the bottom of the third air cavity 003. The top of the first heat preservation cavity 007 is flush with the top of the first air cavity 001. A setting is arranged on the side of the first heat preservation cavity 007 far from the air inlet 11

[0041] Referring to Figure 5, the space enclosed by the third partition 7, the second partition 8, the air nozzle housing 1, the air distribution plate 3 and the air outlet plate 2 forms a second heat preservation cavity 005. The bottom of the second heat preservation cavity 005 is flush with the bottom of the third air cavity 003, and the top of the second heat preservation cavity 005 is flush with the bottom of the first air cavity 003.

[0042] The heat preservation buffer cavity 004 and the second heat preservation cavity 005 are respectively located at both ends of the second air cavity 002 and the third air cavity 003, playing the roles of heat preservation and fixation.

[0043] In addition, referring to Figure 4 and Figure 6 , a transition plate is integrally formed at one end of the air distribution plate 3 close to the air outlet. The transition plate is located above the heat preservation buffer cavity 004 and serves as the top wall of the heat preservation buffer cavity 004. Without the transition plate 33, there will be a dead corner near the air inlet 11 where the hot air blown in from the air inlet 11 does not flow through. Through the arrangement of the transition plate 33, the hot air directly blows on the mesh hole 31 area, improving the flow effect of the hot air.

[0044] Referring to Figure 5 and Figure 6 , a return plate 34 is integrally formed at one end of the air distribution plate 3 away from the air outlet. The return plate 34 is located above the second heat preservation cavity 005 and serves as the top wall of the second heat preservation cavity 005. A wind pressure equalization area 006 is formed between the return plate 34 and the air nozzle housing 1. The wind pressure equalization area 006 is located above the second heat preservation cavity 005, and the wind pressure equalization area 006 plays the role of equalizing the wind pressure. Because the hot air will turn back when it touches the side wall of the wind pressure equalization area 006. Without the wind pressure equalization area 006, the hot air rebounds after contacting the inner wall of the air nozzle housing 1, so that the relative air volume blown out from the mesh hole 31 near the inner wall is very small.

[0045] In this embodiment, referring to Figure 3, the top surface of the air nozzle housing 1 is an inclined surface 12, which slopes from the end of the air inlet 11 towards the other end. And the inclined surface 12 is the top surface of the first air cavity 001. Therefore, the internal space of the first air cavity 001 is inclined downward by the inclined surface 12 and gradually narrows inward from the air inlet 11. Combining with the mesh holes 31 on the air distribution plate 3, the denser the distribution of the mesh holes 31, the smaller the internal space of the first air cavity 001. The angle between the top surface housing and the air distribution plate 3 is an acute angle, so that the hot air in the first air cavity 001 can be reflected by the inclined top surface housing towards the air distribution plate 3 and enter the second air cavity 002. The hot air far from the air inlet 11 can be more quickly reflected by the top surface housing and enter the second air cavity 002. By controlling the air volume, the heat entering from the first air cavity 001 into the second air cavity 002 is made more consistent, avoiding excessive heat loss during transportation. The air blown out by the air nozzle is more uniform, thus optimizing the drying effect of products such as diaphragms.

[0046] In the present utility model, an air distribution plate 3, a mixing air plate 4 and an air equalizing groove 5 are arranged in the air cavity of the air nozzle. The hot air passes through the mesh holes 31 on the air distribution plate 3 that gradually become denser from loose. By controlling the air volume, the hot air reaching the interior has the same heat. And the hot air is mixed by passing through the mixing air plate 4 and the return baffle, enters the air equalizing groove 5 from the diversion slit 43, and is uniformly output from the air equalizing holes 51 on both sides of the air equalizing groove 5. Finally, the hot air is uniformly output from the air outlet holes 22 of the air outlet plate 2. By controlling the air outlet temperature and air outlet speed in the air cavity of the air nozzle, the uniform output of the hot air is realized, the thermal efficiency is improved, the energy loss is reduced, and the stability of the system is increased. The temperature and air volume of the hot air blown out by the air nozzle are more uniform, thus optimizing the drying effect of products such as diaphragms.

[0047] The above is a specific description of the preferred embodiment of the present utility model, but the present utility model is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An oven air nozzle structure, comprising an air nozzle shell with an air cavity inside, the air nozzle shell being provided with an air inlet and an air outlet, characterized in that: A wind uniforming plate and a wind mixing plate are provided inside the air nozzle housing, and the wind uniforming plate and the wind mixing plate separate the air cavity into a first air cavity, a second air cavity and a third air cavity, the air inlet is connected to the first air cavity, and the air outlet is connected to the third air cavity; The wind uniform plate is provided with a plurality of mesh holes, the first wind cavity and the second wind cavity are connected through the mesh holes, the hole density of the mesh holes gradually increases along the length direction of the wind uniform plate, and the hole density of the mesh holes on one side close to the air inlet is less than the hole density of the mesh holes on the other side; The air mixing plate is provided with an air outlet gap, and the air mixing plate is provided with a return baffle on both sides of the air outlet gap, a guide slit is formed between the two return baffles, and the second air cavity is connected with the third air cavity through the guide slit.

2. The oven air nozzle structure according to claim 1, characterized in that: The air outlet gap is located in the middle of the air mixing plate and is arranged along the length direction of the air mixing plate, and the air outlet gap and the mesh holes on the air uniforming plate are staggered in the vertical direction.

3. The oven air nozzle structure according to claim 2, characterized in that: The bottom of the air mixing plate is connected to an air balancing groove, which is used to cover the air outlet gap. The side walls of the air balancing groove are provided with a plurality of air balancing holes, and the depth of the air balancing groove is 10-22mm. The gap lengths between the two side walls of the air balancing groove and the shell are both 6-10mm.

4. The oven air nozzle structure according to claim 1 or 2, characterized in that: The return baffle includes a connecting plate and an extension plate, the connecting plate is connected to the edge of the air outlet gap on the air mixing plate, the gap between the two connecting plates and the air outlet gap form the guide slit, the extension plate is connected to the top of the connecting plate and extends away from the air outlet gap; a return air gap is formed between the side of the extension plate away from the connecting plate and the side wall of the air nozzle housing, and the mesh on the air uniforming plate is located directly above the return air gap; the extension plate is perpendicular to the connecting plate, and the width of the extension plate is 18-20mm.

5. The oven air nozzle structure according to claim 1, characterized in that: The bottom of the air nozzle shell is open, the opening forms the air outlet, the opening is connected to an air outlet plate, and a plurality of air outlet holes are arranged on the air outlet plate; chamfered surfaces are arranged on both sides of the air outlet plate, and a plurality of air outlet holes are also arranged on the chamfered surfaces.

6. The oven air nozzle structure according to claim 5, characterized in that: A first partition is provided in the nozzle shell, and the first partition is connected between the air uniforming plate and the air outlet plate, and one end of the air mixing plate and the air uniforming slot are both connected to the first partition, and a thermal insulation buffer cavity is formed between the first partition and the nozzle shell, and a side of the thermal insulation buffer cavity close to the air inlet is flush with a side of the first air cavity close to the air inlet, and the bottom of the thermal insulation buffer cavity is flush with the bottom of the third air cavity.

7. The oven air nozzle structure according to claim 6, characterized in that: A second partition is arranged in the nozzle shell, the second partition is connected between the air outlet plate and the nozzle shell, and the end of the air uniform plate away from the air inlet is connected to the second partition, a first insulation cavity is formed between the second partition and the nozzle shell, the bottom of the first insulation cavity is flush with the bottom of the third cavity, the top of the first insulation cavity is flush with the top of the first cavity, and the first insulation cavity is arranged on the side away from the air inlet.

8. The oven air nozzle structure according to claim 7, characterized in that: A third partition is arranged in the nozzle shell, and the third partition is connected between the air uniform plate and the air outlet plate, and the ends of the air mixing plate and the air uniform groove away from the thermal insulation buffer chamber are connected to the third partition, and a second thermal insulation chamber is formed between the third partition, the nozzle shell and the second partition, and the bottom of the second thermal insulation chamber is flush with the bottom of the third air chamber, and the top of the second thermal insulation chamber is flush with the bottom of the first air chamber.

9. The oven air nozzle structure according to claim 8, characterized in that: The end of the wind uniforming plate away from the air inlet is integrally formed with a dense hole plate and a return flow plate, the dense hole plate is provided with a plurality of return air holes, the dense hole plate is located above the second air cavity, and the return flow plate is located above the second insulation cavity.

10. The oven air nozzle structure according to claim 1, characterized in that: The top surface of the air nozzle shell is an inclined surface, and the top surface is inclined downward from one end of the air inlet to the other end, and the first air cavity gradually shrinks from one end close to the air inlet to the other end.

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