Single-sided blowing nozzle, oven structure

Abstract

The present invention discloses a nozzle and oven structure, including a shell, wherein an air inlet cavity and a return air cavity are arranged in the shell; the air inlet cavity is provided with a nozzle air inlet and a blowing port; the nozzle air inlet is used to connect to an air source and convey gas to the air inlet cavity; the blowing port is connected to the outside of the shell and is used to discharge the gas in the air inlet cavity to the outside; the return air cavity is provided with a return air port and a nozzle air outlet; the return air port is connected to the outside of the shell and is used to collect the return air generated by the blowing port; the nozzle air outlet is used to connect to an air source and circulate the gas in the return air cavity to the air source. The technical effect is to optimize the return air path of the residual air after drying, reduce the heat loss in the return air process and the heating power of the heating device, save energy consumption, and improve the drying efficiency.

Description

Technical Field

[0001] The invention relates to the field of lithium battery manufacturing equipment, and in particular to a single-sided blowing nozzle and an oven structure with the single-sided blowing nozzle. Background Art

[0002] In recent years, the new energy industry, led by lithium batteries, has shown explosive growth with the strong support of the country. Among them, coating machines, as front-end equipment for battery production, have also been increasingly valued by industry R&D personnel.

[0003] In the manufacturing process of lithium batteries, the substrate that has undergone the coating process in the coating machine needs to be dried before subsequent processing. During the drying process, the substrate coated with the slurry is placed on a conveyor and passed through a drying tunnel composed of multiple ovens. The hot air is blown to the substrate through a nozzle in the drying tunnel to evaporate the water in the slurry. The nozzle of the traditional coating machine oven usually adopts the form of double-sided blowing, that is, the two blowing ports of the nozzle are respectively formed by two sides tending to the upper wall, and the air outlet directions of the two blowing ports are opposite. The nozzles in the oven are staggered above and below the conveyor to blow air to the substrate. The double-sided blowing nozzle has sufficient wind force and high drying efficiency, but at the initial stage of the drying tunnel, the slurry has a high water content and a certain fluidity, so that when the nozzle blows on both sides, the substrate will bend in an S-shaped manner under the influence of wind force and slurry gravity, affecting the uniformity of coating.

[0004] In this regard, in order to solve the problem that the use of double-sided blowing nozzles in the initial stage of the drying tunnel easily leads to uneven slurry, existing coating machines usually set single-sided blowing nozzles at the initial stage of the drying tunnel to pre-dry the substrate. For example, the Chinese invention patent with the current publication number "CN102794260B" discloses a single-sided blowing nozzle and an oven with the nozzle, which adopts a single-sided blowing structure composed of an air inlet cavity, i.e. a slit, and the upper wall of the nozzle is extended and the tail end is provided with an arc, and the airflow wall effect is used to reduce the force of the nozzle blowing on the substrate, reduce the bending amplitude of the substrate, and ensure the uniformity of the slurry in the initial stage of the drying tunnel.

[0005] In order to reduce the cost of wind and heat energy consumption, an oven equipped with the above-mentioned single-sided blowing nozzle is usually also provided with a return air structure, such as a coating machine drying tunnel disclosed in the Chinese invention patent with the current publication number "CN102489438B", which includes a single-sided blowing drying tunnel nozzle, and a hot air return air outlet is arranged adjacent to the drying tunnel nozzle. The hot air return air outlet collects the residual air blown out by the drying tunnel nozzle and after drying the substrate, and circulates the residual air into the hot air blower for heating, thereby achieving the purpose of reducing energy consumption.

[0006] In the above-mentioned prior art, the drying duct nozzle and the hot air return vent are designed to be split, so that the drying duct nozzle is farther away from the return air path of the hot air return vent, resulting in greater heat loss during the return air process and easily generating wind turbulence, affecting the drying efficiency. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a single-sided blowing nozzle and an oven structure using the single-sided blowing nozzle, optimize the return air path of the residual air after drying, reduce the heat loss in the return air process and the heating power of the heating device, save energy consumption, and improve drying efficiency.

[0008] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0009] A single-sided blowing nozzle, characterized in that: it comprises a shell, wherein an air inlet chamber and a return air chamber are provided in the shell; the air inlet chamber is provided with a nozzle air inlet and a blowing outlet; the nozzle air inlet is used to connect to an air source to convey gas to the air inlet chamber; the blowing outlet is connected to the outside of the shell to discharge the gas in the air inlet chamber to the outside; the return air chamber is provided with a return air outlet and a nozzle air outlet; the return air outlet is connected to the outside of the shell to collect the return air generated by the blowing outlet; the nozzle air outlet is used to connect to the air source to circulate the gas in the return air chamber to the wind source.

[0010] By adopting the above technical scheme, the return air inlet, return air chamber and air nozzle adopt an integrated inlet and return structure design. Compared with the existing technology, the return air path is shorter, the residual air loses less heat on the path, and the energy consumption required for subsequent circulation heating of the residual air is lower. Moreover, since the return air path is shortened, turbulence is not easy to generate during the return flow of the residual air, and the return air and drying efficiency are higher.

[0011] Furthermore, a guide surface is formed on the outer wall of the shell between the air blowing port and the return air port, and the guide surface is used to guide the return air formed by blowing out the air blowing port and discharge it into the return air port.

[0012] Through the above scheme, a new wall attachment effect is formed by setting a guide surface on the side of the guide surface close to the air outlet, which interferes with and weakens the wall attachment effect originally generated on the surface of the substrate, helps the residual air enter the return air outlet, and improves the hot air circulation efficiency.

[0013] Furthermore, an outer wall on one side of the shell is recessed inwardly, and at least one guide surface is formed at the recessed portion of the shell, and the guide surface has an arc-shaped cross-section, and the air outlet and the return air outlet are respectively located on both sides of the guide surface.

[0014] Furthermore, the outer wall of one side of the shell is recessed inward, and at least two guide surfaces are formed at the recessed part of the shell, which are respectively a first guide plane and a second guide plane which form an obtuse angle with each other. The air outlet is arranged on the side of the second guide plane away from the first guide plane, and the return air outlet is arranged on the side of the first guide plane away from the second guide plane.

[0015] Furthermore, the outer wall of one side of the shell is recessed inward, and at least three guide surfaces are formed at the recessed part of the shell, which are respectively a third guide plane, a fourth guide arc surface and a fifth guide plane. The fourth guide arc surface is located at the bottom of the recessed part of the shell, and the third guide plane and the fifth guide plane are respectively located on both sides of the fourth guide arc surface. The air outlet is located on the side of the fifth guide plane away from the third guide plane, and the return air outlet is located on the side of the third guide plane away from the fifth guide plane.

[0016] Furthermore, a mesh plate for uniform wind is provided in the air inlet chamber, the air outlet and the air inlet of the air nozzle are respectively located on both sides of the mesh plate, the mesh plate is provided with through holes, and the ventilation volume of the through holes in the middle of the mesh plate is greater than the ventilation volume of the through holes on both sides thereof.

[0017] Another object of the present invention is to provide an oven structure which, in combination with the above-mentioned single-sided blowing nozzle, has the advantages of simple structure and high drying efficiency.

[0018] The above technical objectives of the present invention are achieved through the following technical solutions:

[0019] It comprises a plurality of groups of the above-mentioned single-sided blowing nozzles, and the bottom of one end of the shell is provided with the nozzle air inlet and the nozzle air outlet staggered front and back along the length direction of the shell.

[0020] It also includes an air chamber, one end of which is provided with an oven air inlet, and the other end of which is provided with an oven air outlet, the multiple groups of single-sided blowing nozzles are arranged on the air chamber at equal intervals along the length direction of the air chamber, the air chamber is provided with an oven air inlet duct and an oven air outlet duct, the oven air inlet and the nozzle air inlet of each group of single-sided blowing nozzles are connected to the oven air inlet duct, the oven air outlet and the nozzle air outlet of each group of single-sided blowing nozzles are connected to the oven air outlet duct.

[0021] Through the above technical solution, the structure of the oven is simplified, the oven has a high degree of integration, the air inlet and return air ducts are close together, the heat loss is small, and the drying efficiency is high.

[0022] Furthermore, the oven air inlet duct and the oven air outlet duct are arranged side by side and in parallel in the air chamber, and a side of the air chamber close to the oven air outlet gradually decreases in height along the direction from the oven air inlet to the oven air outlet.

[0023] Furthermore, the oven air inlet duct and the oven air outlet duct are fitted to each other, the oven air inlet duct gradually decreases in width along the direction from the oven air inlet to the oven air outlet, and the oven air outlet duct gradually increases in width along the direction from the oven air inlet to the oven air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The structure of a single-sided blowing nozzle Figure 1 ;

[0025] Figure 2 It is a schematic diagram of the bottom structure of a single-sided blowing nozzle;

[0026] Figure 3 for Figure 2 Section view at AA;

[0027] Figure 4 Schematic diagram of the structure of the guide surface Figure 1 :

[0028] Figure 5 Schematic diagram of the structure of the guide surface Figure 2 ;

[0029] Figure 6 Schematic diagram of the structure of the guide surface Figure 3 ;

[0030] Figure 7 The structure of a single-sided blowing nozzle Figure 2 ;

[0031] Figure 8 A cross-sectional view of a second embodiment of a single-sided blowing nozzle;

[0032] Fig. 9 The three-dimensional structure of the oven is shown in Fig. Figure 1 ;

[0033] Fig.10 Side view of the oven structure Figure 2 ;

[0034] Fig.11 for Fig.10 Sectional view at the middle BB;

[0035] Fig.12 The three-dimensional structure of the oven is shown in Fig. Figure 2 ;

[0036] Fig.13 Side view of the oven structure Figure 2 ;

[0037] Fig.14 for Fig.13 Sectional view at CC;

[0038] Figure numerals: 1. shell; 2. air inlet cavity; 21. air inlet of air nozzle; 22. air outlet; 23. mesh plate; 24. through hole; 3. return air cavity; 31. air outlet of air nozzle; 32. return air outlet; 4. guide surface; 41. first guide plane; 42. second guide plane; 43. third guide plane; 44. fourth guide arc surface; 45. fifth guide plane; 5. air chamber; 51. oven air inlet; 52. oven air outlet; 53. oven air inlet duct; 54. oven air outlet duct. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0044] The first preferred embodiment of the present invention is that the joint between the upper top wall of the shell and the side wall of the shell forms the

[0045] A single-sided blowing nozzle, reference Figure 1 , Figure 2 , like the existing single-blowing structure air nozzles on the market, both include a shell 1, an air inlet chamber 2 is provided in the shell 1, and the air inlet chamber 2 is provided with an air nozzle air inlet 21, and an air outlet 22 connected to the air inlet chamber 2 is formed at the junction of the upper top wall of the shell 1 and a side wall of the shell 1, and the air outlet 22 is a slender slit for discharging the gas in the air inlet chamber 2 to the outside. When working, the air inlet 21 of the air nozzle is connected to the oven air source, and the hot air generated by the oven air source is transported to the air inlet chamber 2 and accumulates pressure in the air inlet chamber 2. After the hot air in the air inlet chamber 2 accumulates pressure, it is blown out from the air outlet 22 to dry the substrate. Due to the Coanda effect (hereinafter referred to as the wall attachment effect), the hot air that is likely to be blown out will adhere to the gap formed by the top wall of the shell 1 and the moving substrate, and finally blown out from the end of the top wall of the shell 1 away from the air outlet 22.

[0046] Compared with the prior art, the present invention has the following improvements: Figure 1 , Figure 2 and Figure 3 A return air chamber 3 is also provided in the shell 1. The return air chamber 3 is provided with a nozzle air outlet 31 and a return air outlet 32. The nozzle air outlet 31 is provided on the shell 1 and connected to the air source. The return air outlet 32 ​​is provided on the side surface of the top wall of the shell 1 away from the blowing port 22, and is used to collect the return air generated by the blowing port 22. It is explained here that the return air here generally refers to the residual air blown out from the blowing port 22 and passing through the surface of the substrate to complete the drying.

[0047] The advantage of the above technical solution is that the wind nozzle as a whole adopts an integrated inlet and return structure design, so that the residual air blown out from the blowing port 22 and after drying the substrate does not need to leave the gap formed by the top wall of the shell 1 and the substrate, and can enter the return air chamber 3 through the return air port 32 on the top wall surface of the shell 1, which greatly shortens the original return air path, thereby reducing the heat loss in the process of returning the residual air, reducing the energy consumption required for subsequent circulation heating, and saving energy and being environmentally friendly. In addition, setting the return air position on the top wall of the shell 1 can avoid the formation of turbulence after the residual air is blown away from the gap formed by the top wall of the shell 1 and the substrate, thereby interfering with subsequent blowing and returning air.

[0048] Considering that when the upper surface of the top wall of the housing 1 is horizontal, the return air position surface is easy to blow, forming a Coanda effect, which seriously weakens the air intake of the return air port 32, the present invention is further improved on the basis of the above technical solution: Figure 3 A guide surface 4 is provided on the outer wall of the shell 1 between the blowing port 22 and the return air port 32, for guiding the return air formed by the blowing port 22 to be discharged into the return air port 32. By providing the guide surface 4, a new wall attachment effect is formed near the return air position, guiding the remaining air after drying to enter the return air port 32, thereby improving the return air efficiency of the return air port 32.

[0049] The shaping structure of the flow guide surface 4 is diverse. In this specific embodiment, three preferred implementation structures are described in detail.

[0050] refer to Figure 4 The top wall of the shell 1 is concave inward, and at least one guide surface 4 is formed at the bottom of the concave outer wall of the shell 1. The cross section of the single guide surface 4 is an arc with an opening upward. The blowing port 22 and the return air port 32 are respectively arranged on both sides of the guide surface 4. One side of the guide surface 4 forms a curvature continuity with the lip wall surface of one side of the blowing port 22. After the hot air blown out of the blowing port 22 completes drying the substrate, it flows through the guide surface 4, and a new wall attachment effect is formed on the side surface of the guide surface 4 close to the blowing port 22, guiding the residual wind to enter the guide surface 4. Since the bottom of the guide surface 4 is an arc, as the centrifugal force acts on the residual wind airflow in the groove, due to the inertia of the gas flow, the residual wind airflow generates a cyclone in the groove, which hinders the inner wall surface of the guide surface 4 away from the blowing port 22 to form a wall attachment effect, so that the residual wind is easier to enter the return air port 32 when passing through the arc-shaped inner wall on the other side of the guide surface 4 away from the blowing port 22, thereby enhancing the return air effect. In actual production, in order to reduce the difficulty of processing, the return air port 32 can be directly set on the inner wall of the guide surface 4 away from the blowing port 22.

[0051] refer to Figure 5 The top wall of the shell 1 is recessed inward, and at least two guide surfaces 4 are formed at the bottom of the recessed outer wall of the shell 1, which are a first guide plane 41 and a second guide plane 42 that form an obtuse angle θ with each other, so that the cross-section of the guide surface 4 is "V"-shaped, and the return air outlet 32 ​​is located on the side of the first guide plane 41 away from the second guide plane 42, the second guide plane 42 and the lip wall surface on one side of the blowing outlet 22 form a curvature continuity, and the first guide plane 41 and the lip wall surface on one side of the return air outlet 32 ​​form a curvature continuity. After the hot air blown out of the blowing port 22 has completed drying the substrate, it flows through the guide surface 4, and forms a new wall effect on the surface of the second guide plane 42, guiding the residual wind to enter the guide surface 4. Driven by kinetic energy, the residual wind airflow will hit the first guide plane 41, causing the gas to impact each other at the bottom of the V-shaped groove, hindering the airflow from forming a wall effect on the surface of the first guide plane 41, and helping the residual wind to enter the return air port 32. This implementation structure is suitable for the situation where the airflow velocity is low and it is not easy to generate a cyclone through the above-mentioned implementation structure. Through simulation analysis, from different wind force actual occasions, the angle θ formed by the bottom of the guide surface 4 is in the range of 100°~160°, and the return air effect of the return air port 32 is better, and it reaches the best when the angle θ is 135°. In actual production, in order to reduce the difficulty of processing, the return air port 32 can be directly set on the first guide plane 41.

[0052] refer to Figure 6The top wall of the shell 1 is recessed inward, and at least three guide surfaces 4 are formed at the bottom of the recess on the outer wall of the shell 1, which are respectively a third guide plane 43, a fourth guide arc surface 44 and a fifth guide plane 45 which are perpendicular to each other. The fourth guide arc surface 44 is located at the bottom of the recess, the third guide plane 43 and the fifth guide plane 45 are respectively located on both sides of the fourth guide arc surface 44, the third guide plane 43 and the fifth guide plane 45 form a curvature continuity with the joint surface of the fourth guide arc surface 44, the fifth guide plane 45 forms a curvature continuity with the lip wall surface on one side of the blowing port 22, and the return air port 32 is located on the side of the third guide plane 43 away from the fifth guide plane 45. This implementation structure is suitable for the situation where the residual air flow rate is fast and the pressure is high. After drying, the residual air forms a new wall attachment effect on the surface of the fifth guide plane 45, guiding the residual air into the guide surface 4 and accumulating on the fourth guide arc surface 44. Under the centrifugal force, the airflow on the fourth guide arc surface 44 produces a swirl, which has a buffering effect on the subsequent airflow entering, and at the same time hinders the airflow climbing to the third guide plane 43 from forming a wall attachment effect on the surface of the third guide plane 43, thereby increasing the air intake of the return air port 32. In order to reduce the difficulty of processing during production, the return air port 32 can be directly set on the third guide plane 43 at the recessed part of the shell 1.

[0053] According to the replacement principle, after reading the above three implementation structures of the guide surface 4, technical personnel in this field should be able to associate other implementation structures of the guide surface 4 that can achieve the same technical effect, and the corresponding structures derived from this will not be repeated here.

[0054] refer to Figure 2 , Figure 3 In order to make the airflow from the blowing port 22 more uniform, a mesh plate 23 is also provided in the air inlet chamber 2 for uniform wind. The mesh plate 23 is provided with a plurality of through holes 24. The ventilation volume of the through holes 24 in the middle of the mesh plate 23 is greater than the ventilation volume of the through holes 24 on both sides thereof. In this way, the airflow velocity from both ends of the blowing port 22 can be relatively low, which prevents the substrate edge from being over-dried and makes the coating more uniform. In order to achieve "the ventilation volume of the through holes 24 in the middle of the mesh plate 23 is greater than the ventilation volume of the through holes 24 on both sides thereof", the relative hole spacing of the through holes 24 on the mesh plate 23 can be adjusted, such as the hole spacing between the through holes 24 at the two end areas of the mesh plate 23 is greater than the hole spacing between the through holes 24 in the middle area of ​​the mesh plate 23. In addition, the above purpose can also be achieved by adjusting the number distribution of the through holes 24 on the mesh plate 23 and the aperture size of the through holes 24.

[0055] refer to Figure 2 In order to cooperate with an oven structure mentioned below, in this specific embodiment, the air nozzle inlet 21 and the air nozzle outlet 31 are both located on the bottom surface of one end of the shell 1, and are staggered front and back along the length direction of the shell 1, and the return air chamber 3 and the air inlet chamber 2 are arranged inside the shell 1 in a side-by-side fit.

[0056] Of course, the present invention does not exclude that the nozzle air inlet 21 and the nozzle air outlet 31 have other implementation structures, such as:

[0057] refer to Figure 7 , Figure 8 The air inlet 21 and the air outlet 31 of the air nozzle are both located on one side end surface of the shell 1 , the return air chamber 3 is located at the upper part of the shell 1 , and the air inlet chamber 2 is located at the lower part of the shell 1 .

[0058] Another preferred embodiment of the present invention is:

[0059] refer to Fig. 9 , Fig.10 , Fig.11 , an oven structure, including a plenum 5, the top of which is evenly and equidistantly provided with a plurality of groups of single-sided blowing nozzles as shown in the first specific embodiment along its length direction, an oven air inlet 51 is provided at one end of the plenum 5, an oven air outlet 52 is provided at the other end of the plenum 5, an oven air inlet duct 53 and an oven air outlet duct 54 are provided in the plenum 5, the oven air inlet duct 53 is connected to the oven air inlet 51 and the nozzle air inlet 21 of each group of single-sided blowing nozzles at the same time, and the oven air outlet duct 54 is connected to the oven air outlet 52 and the nozzle air outlet 31 of each group of nozzles. Compared with the existing oven structure composed of the nozzle and the plenum 5 with an external return air structure, the oven structure provided by the present invention is simple, highly integrated, the air inlet and return air ducts are fitted, and the heat loss is small.

[0060] In order to make the air volume obtained by each set of single-sided blowing nozzles uniform and the air intake smoother, the shapes of the oven air inlet duct 53 and the oven air outlet duct 54 are further improved:

[0061] The oven air inlet duct 53 and the oven air outlet duct 54 are arranged side by side and in parallel in the air chamber 5. The height of the air chamber 5 on one side close to the oven air outlet 52 gradually decreases from the oven air inlet 51 to the oven air outlet 52. The advantage of this is that after the hot air enters the oven air inlet duct 53 through the oven air inlet 51, the volume of the oven air inlet duct 53 and the oven air outlet duct 54 gradually decreases, which will compress and guide the hot air, so that the flow rate and pressure of the hot air blown out by each air nozzle are uniform.

[0062] The present invention does not exclude other implementation structures that adjust the volume distribution of the air chamber 5 to make the air outlet of the air nozzle uniform, such as: Fig.12 , Fig.13 and Fig.14 The oven air inlet duct 53 and the oven air outlet duct 54 fit each other, the width of the oven air inlet duct 53 gradually decreases along the direction from the oven air inlet 51 to the oven air outlet 52, and the width of the oven air outlet duct 54 gradually increases along the direction from the oven air inlet 51 to the oven air outlet 52.

[0063] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A single-sided blowing nozzle, characterized in that: comprising a housing (1), The housing (1) is provided with an air inlet chamber (2) and an air return chamber (3); The air inlet cavity (2) is provided with an air nozzle air inlet (21); a blowing port (22) communicating with the air inlet cavity (2) is formed at the junction of the upper top wall of the shell (1) and a side wall of the shell (1); The air nozzle air inlet (21) is used to connect to an air source to deliver gas to the air inlet cavity (2); The air outlet (22) is connected to the outside of the housing (1) and is used to discharge the gas in the air inlet cavity (2) to the outside; The return air chamber (3) is provided with a return air port (32) and an air nozzle outlet (31); The return air port (32) is arranged on a side surface of the top wall of the shell (1) away from the air blowing port (22) and is connected to the outside of the shell (1) and is used to collect the return air generated by the air blowing port (22); The air nozzle outlet (31) is arranged on the shell (1) and is used to connect to an air source so as to circulate the gas in the return air chamber (3) to the air source; the shell (1) is provided with a guide surface (4) on the outer wall between the air blowing port (22) and the return air port (32); the air blowing port (22) and the return air port (32) are respectively located on both sides of the guide surface (4); the guide surface (4) is used to guide the return air formed by blowing out the air blowing port (22) and discharge it into the return air port (32).

2. The one-sided blowing nozzle according to claim 1, characterized in that: The outer wall of one side of the shell (1) is recessed inwards, and at least one guide surface (4) is formed at the recessed portion of the shell (1). The cross section of the guide surface (4) is arc-shaped, and the air outlet (22) and the return air outlet (32) are respectively located on both sides of the guide surface (4).

3. The one-sided blowing nozzle according to claim 1, characterized in that: The outer wall of one side of the shell (1) is recessed inwards, and at least two guide surfaces (4) are formed at the recessed portion of the shell (1), and are respectively a first guide plane (41) and a second guide plane (42) which form an obtuse angle with each other. The air outlet (22) is arranged on a side of the second guide plane (42) away from the first guide plane (41), and the return air outlet (32) is arranged on a side of the first guide plane (41) away from the second guide plane (42).

4. The one-sided blowing nozzle according to claim 1, characterized in that: The outer wall of one side of the shell (1) is recessed inwardly, and at least three guide surfaces (4) are formed at the recessed portion of the shell (1), which are respectively a third guide plane (43), a fourth guide arc surface (44) and a fifth guide plane (45). The fourth guide arc surface (44) is located at the bottom of the recess of the shell (1), and the third guide plane (43) and the fifth guide plane (45) are respectively located on both sides of the fourth guide arc surface (44). The air outlet (22) is located on a side of the fifth guide plane (45) away from the third guide plane (43), and the return air outlet (32) is located on a side of the third guide plane (43) away from the fifth guide plane (45).

5. The one-sided blowing nozzle according to claim 1, characterized in that: A mesh plate (23) for uniform air flow is arranged in the air inlet chamber (2); the air outlet (22) and the air nozzle air inlet (21) are respectively located on two sides of the mesh plate (23); through holes (24) are arranged on the mesh plate (23); and the ventilation volume of the through holes in the middle of the mesh plate (23) is greater than the ventilation volume of the through holes on both sides thereof.

6. An oven structure, characterized in that: It comprises a plurality of groups of single-sided blowing nozzles as described in any one of claims 1 to 5, wherein the bottom of one end of the shell (1) is provided with the nozzle air inlet (21) and the nozzle air outlet (31) staggered forward and backward along the length direction of the shell (1).

7. The oven structure according to claim 6, characterized in that: The invention also comprises an air chamber (5), wherein one end of the air chamber (5) is provided with an oven air inlet (51), and the other end thereof is provided with an oven air outlet (52); the plurality of groups of single-sided blowing nozzles are arranged on the air chamber (5) at equal intervals along the length direction of the air chamber (5); the air chamber (5) has an oven air inlet duct (53) and an oven air outlet duct (54); the oven air inlet (51) and the nozzle air inlet (21) of each group of single-sided blowing nozzles are connected to the oven air inlet duct (53); the oven air outlet (52) and the nozzle air outlet (31) of each group of single-sided blowing nozzles are connected to the oven air outlet duct (54).

8. The oven structure according to claim 7, characterized in that: The oven air inlet duct (53) and the oven air outlet duct (54) are arranged side by side and in parallel in the air chamber (5), and the height of one side of the air chamber (5) close to the oven air outlet (52) gradually decreases along the direction from the oven air inlet (51) to the oven air outlet (52).

9. The oven structure according to claim 7, characterized in that: The oven air inlet duct (53) and the oven air outlet duct (54) are fitted together; the width of the oven air inlet duct (53) gradually decreases along the direction from the oven air inlet (51) to the oven air outlet (52); and the width of the oven air outlet duct (54) gradually increases along the direction from the oven air inlet (51) to the oven air outlet (52).

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