Suspension oven air nozzle

Abstract

The suspension oven air nozzle disclosed by the application comprises a shell with a longitudinal section in a polygonal shape, a pressure relief cavity with a longitudinal section in a polygonal shape is arranged in the shell, the shell has a first inclined surface and a second inclined surface arranged opposite to each other, the pressure relief cavity has a third inclined surface corresponding to the first inclined surface and a fourth inclined surface corresponding to the second inclined surface, a first gap is formed between the first inclined surface and the third inclined surface, a second gap is formed between the second inclined surface and the fourth inclined surface, and a plurality of pressure relief holes are arranged on a bottom plate; the shell further has an upper flow uniformizing plate and a lower flow uniformizing plate, and flow uniformizing holes are arranged on the flow uniformizing plates. The suspension oven air nozzle of the application effectively strengthens the uniformity of the airflow entering the air nozzle through the two-layer flow uniformizing plates, the elliptical pressure relief cavity can reduce the energy loss caused by the frontal impact of the airflow on the inner cavity, the pressure relief holes are arranged in an elliptical shape, the uniformity of the pressure distribution below the air nozzle is improved, the jet pressure distribution of the air nozzle is relatively optimal, the outlet airflow speed of the gap is high, and the surface pressure distribution of the material film and the drying efficiency of the material film are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of suspension type printing coating oven drying, and relates to a suspension type oven air nozzle. BACKGROUND

[0002] In the working of high-precision printing coating equipment, the drying process is a mass and heat transfer process, and the internal mechanism is quite complex. The drying structure of the oven directly affects the energy saving effect of the whole machine and the quality of the product. Therefore, the drying part of the oven has become one of the concerns of people on how to improve the quality of the printed product.

[0003] In order to solve the problems of agglomeration, pinholes, uneven thickness, scratches, and tailing of the coating layer caused by poor drying, the suspension type oven is applied to the coating equipment. The suspension drying technology is a way of hot air drying, also known as floating or air floating oven. It uses the air from the air nozzle of the air knife to blow to the substrate instead of the traditional supporting roller transmission system. It utilizes the principle of aerodynamics to form a special hot air flow field by the hot air blown from a series of upper and lower staggered nozzles. The substrate runs in the air field and is dried. In the drying process of the coating machine, the hot air generated by the air nozzle of the suspension air knife makes the drying sheet float in the drying oven.

[0004] The current suspension type oven air nozzle has uneven pressure distribution on the surface of the material film. When the air pressure in the middle of the material film width direction is greatly different from the air pressure on both sides, the material film will bend, so that the material film is unevenly heated, which easily causes the material film to curl, and finally affects the quality of the material film. At the same time, the current air nozzle has a low speed at the outlet of the slit, which affects the drying efficiency of the material film. Therefore, it is of great significance to optimize the structure of the oven jet air nozzle. SUMMARY

[0005] The purpose of the present application is to provide a suspension type oven air nozzle which can improve the pressure distribution on the surface of the material film, improve the production quality of the material film, and improve the speed at the outlet of the slit of the air nozzle and the drying efficiency without affecting the printing speed.

[0006] The technical solution adopted by the present application is that the suspension type oven air nozzle comprises a shell with a longitudinal section in the shape of a polygon, a pressure relief cavity with a longitudinal section in the shape of a polygon is arranged in the shell, the shell has a first inclined surface and a second inclined surface arranged opposite to each other, the pressure relief cavity has a third inclined surface arranged in parallel corresponding to the first inclined surface, a fourth inclined surface arranged in parallel corresponding to the second inclined surface, a bottom plate fixed between the bottom side of the third inclined surface and the bottom side of the fourth inclined surface, and a top plate fixed between the top side of the third inclined surface and the top side of the fourth inclined surface, a first slit is formed between the first inclined surface and the third inclined surface, a second slit is formed between the second inclined surface and the fourth inclined surface, and a plurality of pressure relief holes are formed in the bottom plate.

[0007] The shell further has an upper flow uniformizing plate arranged opposite to the bottom plate, and a lower flow uniformizing plate is installed in parallel below the upper flow uniformizing plate, and a plurality of flow uniformizing holes are formed in the upper flow uniformizing plate and the lower flow uniformizing plate.

[0008] The application also has the characteristics that:

[0009] The shell further has two side length plates arranged in parallel and two air nozzle cover plates arranged in parallel, the air nozzle cover plates are matched with the longitudinal section shape of the shell, and through holes matched with the longitudinal section of the pressure relief cavity are formed in the air nozzle cover plates; the top sides of the side length plates are fixedly connected with the upper flow uniformizing plate, and the bottom sides of the side length plates are fixedly connected with the first inclined surface and the second inclined surface respectively.

[0010] The top plate is in an arc shape, and the two ends of the arc shape are connected with the third inclined surface and the fourth inclined surface respectively, and the inner side of the arc shape faces the bottom plate.

[0011] The top plate is in a semi-elliptical shape.

[0012] The plurality of pressure relief holes are arranged in an elliptical shape as a whole.

[0013] The bottom plate is a rectangular bottom plate with thick ends and a thin middle part in the length direction.

[0014] The application has the beneficial effects that:

[0015] The air nozzle of the application adopts two layers of flow uniformizing plates, can effectively strengthen the uniformity of the airflow entering the air nozzle, the elliptical pressure relief cavity can reduce the energy loss caused by the front impact of the airflow on the inner cavity, the pressure relief holes are arranged in an elliptical shape and are arranged in a horizontal center line, and the uniformity of the pressure distribution below the air nozzle can be obviously improved, the jet flow pressure distribution of the air nozzle is better, the air speed of the air nozzle slit outlet is high, and the air nozzle is helpful to improve the material film surface pressure distribution and improve the material film drying efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the air nozzle of the application;

[0017] Figure 2 is a sectional view of the air nozzle of the application;

[0018] Figure 3 is a structural schematic view of the pressure relief cavity of the air nozzle of the application;

[0019] Figure 4 is a structural schematic view of the bottom plate of the air nozzle of the application

[0020] Figure 5 is a side view of the bottom plate of the air nozzle of the application.

[0021] In the figure, 1. upper flow uniformity plate, 2. lower flow uniformity plate, 3. flow uniformity hole, 4. side long plate, 5. top plate, 6. bottom plate, 7. pressure relief hole, 8. tuyere cover plate. DETAILED DESCRIPTION

[0022] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0023] Example 1

[0024] The structure of the tuyere of the present application is shown in Figure 1 and Figure 2 , which comprises a shell with a longitudinal cross section in the shape of a polygon, the shell having a first inclined surface and a second inclined surface arranged opposite each other, an upper flow uniformity plate 1, two side long plates 4 arranged parallel to each other, and two tuyere cover plates 8 arranged parallel to each other. A lower flow uniformity plate 2 is arranged parallel to the upper flow uniformity plate 1 inside the shell. A plurality of flow uniformity holes 3 are formed in the upper flow uniformity plate 1 and the lower flow uniformity plate 2. The upper flow uniformity plate 1 and the lower flow uniformity plate 2 are integrally connected to the left and right side long plates 4 by welding. The top side of the side long plates 4 is fixedly connected to the upper flow uniformity plate 1, and the bottom side of the side long plates 4 is fixedly connected to the first inclined surface and the second inclined surface, respectively. The use of two layers of flow uniformity plates allows the upper flow uniformity plate 1 to preliminarily straighten the disordered airflow entering the tuyere, and the lower flow uniformity plate 2 to straighten the disordered airflow entering the tuyere for a second time, so that the airflow entering the tuyere is more uniform. The side long plates 4 limit the direction of the airflow in the tuyere and guide the airflow in the tuyere towards the slit outlet.

[0025] Below the lower flow uniformity plate 2 is a pressure relief cavity with a longitudinal cross section in the shape of a polygon, as shown in Figure 2 and Figure 3 , which comprises a third inclined surface arranged parallel to the first inclined surface, a fourth inclined surface arranged parallel to the second inclined surface, a bottom plate 6 fixedly connected between the bottom side of the third inclined surface and the bottom side of the fourth inclined surface, and a top plate 5 fixedly connected between the top side of the third inclined surface and the top side of the fourth inclined surface, which are integrally connected by welding to form the pressure relief cavity. As shown in Figure 3 , the cross section of the top plate 5 is in the shape of an arc, preferably a semi-elliptical arc, with the two ends of the arc connected to the third inclined surface and the fourth inclined surface, respectively, and the inner side of the arc facing the bottom plate 6, for guiding the airflow from the flow uniformity plates. The top plate 5 guides the airflow entering the interior of the tuyere to the slit outlet of the tuyere. Compared to the general use of flat plates to contact the airflow in the outer cavity of a polygonal inner cavity, the curved surface of the top plate 5 can effectively reduce the energy loss caused by the direct impact of the airflow on the inner cavity, thereby increasing the wind speed at the slit outlet.

[0026] The first inclined surface and the third inclined surface form a first slit, and the second inclined surface and the fourth inclined surface form a second slit.

[0027] Example 2

[0028] Based on Example 1, as shown in Figure 4 and Figure 5 , the first inclined surface and the third inclined surface form a first slit, and the second inclined surface and the fourth inclined surface form a second slit.As shown, the bottom plate 6 is a rectangular bottom plate with thick ends and thin middle in the length direction, the uneven pressure distribution and uneven velocity distribution on the material film surface are improved by changing the air supply height of the area with higher pressure, the bottom plate 6 is provided with a plurality of pressure relief holes 7, the plurality of pressure relief holes 7 are arranged in an oval type surrounding combination and have a horizontal arrangement in the center. The arrangement of the bottom plate 6 and the pressure relief hole 7 can reduce the influence of the cyclone generated by the jet on the wind speed and pressure on the material film surface, and the pressure distribution and velocity distribution are more uniform than the general rectangular arrangement of the pressure relief hole bottom plate.

[0029] Example 3

[0030] Based on example 2, as shown, Figure 2 The air nozzle cover plate 8 matches the longitudinal section shape of the shell and is provided with a through hole matching the longitudinal section of the pressure relief cavity, the air nozzle cover plate 8 is located in front of and behind the pressure relief cavity and is welded with the upper uniform flow plate 1, the lower uniform flow plate 2 and the side long plate 4 respectively. The airflow entering from the pressure relief hole 7 on the bottom plate 6 is transferred from the through hole on the front and rear air nozzle cover plate 8 to the outside of the air nozzle through the pressure relief cavity.

[0031] The working principle of the air nozzle of the suspension oven is as follows:

[0032] The upper uniform flow plate 1 and the lower uniform flow plate 2 are flat and long cuboid plates, which are provided with uniform flow holes 3, the airflow passing through the uniform flow holes 3 on the upper and lower uniform flow plates makes the irregular airflow regular and orderly, so that the airflow entering the air nozzle is more uniform and orderly.

[0033] The working process of the air nozzle of the suspension oven is as follows: the irregular airflow outside is rectified and uniformed by the uniform flow holes 3 on the upper uniform flow plate 1 and the lower uniform flow plate 2, and the more uniform and stable airflow is introduced into the inside of the air nozzle shell, the jet airflow entering the inside of the shell is guided on the top plate 5 on the relatively smooth oval surface, and the airflow can reduce the energy loss by the guidance of the top plate 5. After that, the airflow is guided by the top plate 5 and the side long plate 4, and the jet airflow is discharged at the slit outlet formed by the side long plate 4 and the top plate 5, and the gas is jetted from the slit outlet to the material film surface, and two cyclones are formed on the material film surface, the cyclone can interfere with the pressure and velocity distribution on the material film surface, the cyclone is drawn out of the air nozzle cover plate 8 by the horizontal and oval type surrounding combination of the pressure relief hole 7 on the bottom plate 6, thereby reducing the influence of the cyclone, in addition, the bottom plate 6 is a rectangular bottom plate with thick ends and thin middle in the length direction, the uneven pressure distribution and uneven velocity distribution on the material film surface are improved by changing the air supply height of the area with higher pressure.

[0034] The suspension oven air nozzle has the advantages that two uniform flow plates are adopted, the uniformity of the air flow entering the air nozzle can be effectively enhanced, the pressure relief cavity in the shape of an ellipse can reduce the energy loss caused by the front impact of the air flow on the inner cavity, the pressure relief holes are arranged in the shape of an ellipse and are arranged in a horizontal line at the center, the uniformity of the pressure distribution below the air nozzle can be obviously improved, the bottom plate structure can further improve the uniformity of the pressure distribution below the air nozzle by changing the height of the air supply, the jet flow pressure distribution of the air nozzle is relatively optimal, the air speed of the air nozzle slit outlet is high, and the air nozzle slit outlet is helpful to improve the material film surface pressure distribution and improve the material film drying efficiency.

Claims

1. A suspension oven air nozzle characterized by, The shell with longitudinal section of polygon has a pressure relief cavity with longitudinal section of polygon arranged in the shell, the shell has a first inclined surface and a second inclined surface arranged opposite to each other, the pressure relief cavity has a third inclined surface arranged in parallel corresponding to the first inclined surface, a fourth inclined surface arranged in parallel corresponding to the second inclined surface, a bottom plate (6) fixed between the bottom side of the third inclined surface and the bottom side of the fourth inclined surface, and a top plate (5) fixed between the top side of the third inclined surface and the top side of the fourth inclined surface, a first gap is formed between the first inclined surface and the third inclined surface, a second gap is formed between the second inclined surface and the fourth inclined surface, and a plurality of pressure relief holes (7) are formed in the bottom plate (6). The shell further has an upper flow uniformizing plate (1) arranged opposite to the bottom plate (6), a lower flow uniformizing plate (2) is arranged in parallel below the upper flow uniformizing plate (1), and a plurality of flow uniformizing holes (3) are formed in the upper flow uniformizing plate (1) and the lower flow uniformizing plate (2). The top plate (5) has an arc-shaped cross section, the two ends of the arc-shaped cross section are connected to the third inclined surface and the fourth inclined surface respectively, and the inner side of the arc-shaped cross section faces the bottom plate (6). The bottom plate (6) is a rectangular bottom plate with thick ends and thin middle.

2. The suspension oven air nozzle of claim 1, wherein, The shell further has two side length plates (4) arranged in parallel and two tuyere cover plates (8) arranged in parallel, the tuyere cover plate (8) is matched with the shape of the longitudinal section of the shell, the tuyere cover plate (8) has a through hole matched with the longitudinal section of the pressure relief cavity, the top side of the side length plate (4) is fixed to the upper flow uniformizing plate (1), and the bottom side of the side length plate (4) is fixed to the first inclined surface and the second inclined surface respectively.

3. The suspension oven air nozzle of claim 1, wherein, The top plate (5) has a semi-elliptical cross section.

4. The suspension oven air nozzle of claim 1, wherein, The plurality of pressure relief holes (7) are arranged in an elliptical shape as a whole. The top plate (5) has a semi-elliptical cross section. The plurality of pressure relief holes (7) are arranged in an elliptical shape as a whole.

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