Air uniformizing air pipe

Abstract

The utility model discloses an air uniformizing air pipe, which relates to the technical field of printing equipment and comprises a pipe body, two ends of the pipe body are respectively provided with an air inlet and a heat dissipation port, the bottom surface of the pipe body is provided with an air outlet part along the length direction, the air outlet part is divided into a plurality of air outlet cavities by separation layers along the length direction, and the air outlet cavities are provided with shrunk flat air outlets. And the side wall of the air outlet is an inclined wall and is shrunk towards the outlet. The utility model provides an air uniformizing air pipe which improves the drying effect of all positions on the surface of a printing roller.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing equipment technical field, concretely relates to a uniform wind air pipe. BACKGROUND

[0002] The hot air circulation oven system widely used in the current printing industry is mainly composed of a centrifugal fan, a heating element, an air supply pipeline and a box structure. In a typical layout, the air supply port is designed in a linear array distribution, and the air supply holes are arranged equidistantly along the axis of the printing roller. This structure is prone to Bernoulli effect in actual operation, resulting in a wind pressure attenuation of 30%-45% at the end of the air supply pipeline, a Reynolds number difference of more than 2000 between the air inlet end and the air outlet end, and a significant air flow gradient distribution. The thermal imaging data shows that the transverse temperature fluctuation on the surface of the printing roller with a width of 1.6m can reach ±15℃, directly leading to a difference of more than 40% in the evaporation rate in different areas at the same paper speed. The hot air speed and temperature are lower at the surface of the printing roller far from the air inlet end, resulting in a lower evaporation rate. SUMMARY

[0003] TECHNICAL PROBLEM

[0004] The technical problem to be solved by the utility model is to provide a uniform wind air pipe to improve the drying effect on the surface of the printing roller.

[0005] TECHNICAL SCHEME

[0006] To solve the above problems, the utility model provides the technical scheme as follows:

[0007] A uniform wind air pipe, comprising a pipe body, the two ends of the pipe body are an air inlet and a heat dissipation port respectively, the bottom surface of the pipe body is provided with an air outlet part along the length direction, the air outlet part is divided into a plurality of air outlet cavities by a partition layer along the length direction, the air outlet cavities are provided with reduced flat air outlet ports, and the side walls of the air outlet ports are inclined walls and gradually reduced towards the outlet.

[0008] The bottom surface of the pipe body is provided with an air outlet part along the length direction, and the air outlet part is divided into a plurality of air outlet cavities by a partition layer. The existence of the partition layer allows air to be distributed in each independent air outlet cavity, which helps to reduce the problem of wind pressure attenuation caused by directly passing through the length of the pipeline. Each air outlet cavity is provided with a reduced flat air outlet port, and the side walls of the air outlet ports are inclined walls and gradually reduced towards the outlet. This unique design can help to increase the wind speed at the outlet, and because the outlet is narrowed, the air flow is more concentrated and stable, thereby improving the hot air distribution on the surface of the entire printing roller. Moreover, the flat air outlet ports are along the length direction of the pipe body, and hot air can be blown to the surface of the printing roller as much as possible to improve the drying effect.

[0009] As an option, the partition layer is externally separated from a heat dissipation cavity, and the heat dissipation cavity is connected with a heat dissipation port.

[0010] By setting a heat dissipation cavity outside the partition layer and connecting it to the heat dissipation port, the temperature of the entire system can be adjusted to prevent overheating, thereby protecting the equipment and improving its service life.

[0011] As an option, the air outlet is provided with at least three and symmetrically distributed.

[0012] Uniform air distribution: By setting at least three and symmetrically distributed air outlets, it can ensure that the hot air is more evenly distributed on the surface of the printing roller. This helps to reduce the differences in drying effect caused by uneven air flow, so that the printed material can be uniformly dried at different positions.

[0013] Improve drying efficiency: Symmetrically distributed multiple air outlets can increase the opportunity and area of hot air contact with the surface of the printing roller, thereby improving the overall drying efficiency. Each air outlet is specially designed (with inclined side walls and narrowing towards the outlet) to optimize air flow speed and direction, further enhancing drying effect.

[0014] Balance air pressure: The design of multiple air outlets also helps to balance the air pressure within the entire system. Especially in longer pipelines, this design can effectively reduce the problem of air pressure decay caused by distance, maintaining relatively stable air flow from the air inlet to the heat dissipation port.

[0015] Structural stability: Symmetric layout not only benefits the uniform distribution of air flow, but also may contribute to the structural stability of the air pipe itself, especially in the case of high-speed air flow, reasonable layout can reduce unnecessary vibration or noise.

[0016] As an option, the outlet of the air outlet located at the edge is inclined towards the edge.

[0017] Generally, the edge area of the printed material may not be as effectively dried as the central area due to uneven air distribution. By tilting the outlet of the edge air outlet towards the edge, hot air can be concentrated on these often overlooked areas, ensuring uniform drying of the entire printed material surface. In many processing processes, "edge effect" is a common problem, which refers to the different characteristics of the edge part due to differences in contact area or heating conditions. In this case, adjusting the direction of the edge air outlet helps to compensate for this effect, so that the edge and central parts can have more consistent temperature and evaporation rate. By specifically improving the drying conditions of the edge area, not only can the quality of the final product be improved, but also the production efficiency can be improved to some extent.

[0018] As an option, the outlet of the air outlet is provided with an equal-width section.

[0019] The design of the equal-width section can provide a stable transition area before the airflow passes through the gradually narrowing inclined wall to reach the outlet. This helps to reduce the formation of turbulent flow and unstable airflow, making the outflowing hot air more stable and concentrated, thereby improving the drying effect on the surface of the printed material. The equal-width section helps to ensure that the hot air flow parameters (such as speed and temperature) from each outlet are more consistent

[0020] As an option, the pipe body is provided with a pipe shell, and the cross section of the pipe shell is trapezoidal.

[0021] The trapezoidal cross section of the pipe shell forms a larger space in the inner cavity of the pipe body, which can accommodate more hot air. In the case of a reduced outlet, the trapezoidal structure can increase the area ratio of the hot air passing through, improve the Bernoulli effect, and optimize the drying effect. And the trapezoidal cross section structure can expand the outlet area at the outlet position, increasing the drying area.

[0022] As an option, the cross section of the outlet cavity is trapezoidal.

[0023] The trapezoidal cross section of the outlet cavity can more effectively guide the airflow, making the air more evenly distributed when passing through each outlet cavity. Compared with a flat surface or simple geometric shape, the trapezoidal cross section structure can increase the structural strength and stability. The trapezoidal structure can increase the area ratio of the hot air passing through, improve the Bernoulli effect, and optimize the drying effect. And the trapezoidal cross section structure can expand the outlet area at the outlet position, increasing the drying area.

[0024] As an option, the bottom horizontal plane of the pipe shell has a distance from the horizontal plane of the outlet.

[0025] By ensuring that there is a certain distance between the bottom of the pipe shell and the outlet, a smoother channel can be provided for high-speed hot air, avoiding excessive hot air pressure at the outlet, and reducing airflow obstruction or turbulence caused by the structure.

[0026] As an option, the inlet area of the outlet cavity far from the inlet is larger than that of other outlet cavities.

[0027] As the distance from the inlet increases, the wind pressure in the pipe will generally decrease. By increasing the inlet area of the outlet cavity far from the inlet, the problem of airflow reduction caused by wind pressure decay can be compensated for, ensuring that each outlet cavity can obtain sufficient air volume. Since wind pressure decay can cause inconsistent drying effects on different areas of the printing roller surface, increasing the inlet area of the outlet cavity at the far end helps to provide more uniform airflow distribution, thereby improving the drying uniformity of the entire printed material surface and avoiding poor drying in some areas due to insufficient air volume. By precisely adjusting the inlet area of each outlet cavity, the heat and airflow in the system can be more reasonably distributed, improving the overall energy utilization rate.

[0028] Advantages

[0029] Compared with the prior art, the technical scheme provided by the utility model has the following advantages:

[0030] In the technical scheme provided by the utility model, the two ends of the pipe body are an air inlet and a heat dissipation port respectively, the side surface of the pipe body is provided with an air outlet part along the length direction, and is divided into multiple air outlet cavities by a partition layer, the air outlet cavities are provided with reduced flat air outlets, the side wall is an inclined wall and is designed to gradually reduce towards the outlet. Wind pressure attenuation and temperature change caused by the length of the pipeline can be effectively reduced, and the distribution of hot air at all places on the printing roller surface is improved, so that the consistency and efficiency of drying are improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structure diagram of the uniform air distribution air pipe is provided for the embodiment of the utility model;

[0032] Figure 2 An end section view of the uniform air distribution air pipe is provided for the embodiment of the utility model;

[0033] Figure 3 A length direction section view of the uniform air distribution air pipe is provided for the embodiment of the utility model;

[0034] 1, air inlet; 2, pipe body; 3, heat dissipation port; 4, air outlet part; 401, middle air outlet; 402, side air outlet; 403, middle shrinkage; 404, side shrinkage; 5, pipe shell; 6, first partition layer; 601, first air outlet cavity; 7, second partition layer; 601, second air outlet cavity; 8, third partition layer; 601, third air outlet cavity; 9, fourth partition layer; 901, fourth air outlet cavity; 10, heat dissipation cavity. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings and the embodiments.

[0036] Embodiment 1

[0037] In combination with the drawings, Figure 1 A uniform air distribution air pipe, comprising a pipe body 2, the two ends of the pipe body 2 are an air inlet 1 and a heat dissipation port 3 respectively, the pipe body 2 is a columnar body with a trapezoidal cross section, the air inlet 1 and the heat dissipation port 3 are circular and arranged at the two ends of the pipe body 2. The pipe body 2 is provided with a pipe shell 5 outside, and the cross section of the pipe shell 5 is trapezoidal. The pipe body 2 is made of SUS304 stainless steel, the thickness is 1.2 mm, the partition layer is punched and formed by galvanized steel plate, the thickness is 0.8 mm, and the sealing member is silicone rubber (temperature resistance 250 DEG C)

[0038] In combination with the drawings, Figure 3, the bottom surface of the pipe body 2 is provided with an air outlet part 4 along the length direction, the air outlet part 4 is distributed on the entire bottom surface of the pipe body 2 to enlarge the air outlet area. The air outlet cavity is provided with a narrowed flat air outlet, the side wall of the air outlet is an inclined wall and is narrowed towards the outlet. The air outlet is provided with at least three and is symmetrically distributed along the middle air outlet 401. In the embodiment, the bottom of the pipe body 2 is provided with a middle air outlet 401 and two side air outlets 402, the cross sections of the middle air outlet 401 and the two side air outlets 402 are all inverted triangular shapes, and the outlet of the air outlet located at the edge is inclined towards the edge. The outlet of the middle air outlet 401 is a middle narrowing gap 403, and the outlet of the side air outlet 402 is a side narrowing gap 404. The narrowed part of the outlet of the air outlet (i.e. the middle narrowing gap 403 and the side narrowing gap 404) is provided with an equal-width section. The two side walls of the middle narrowing gap 403 are both bent, and the middle narrowing gap 403 is vertically downward. The inner side wall of the side narrowing gap 404 is not bent, which is an inclined straight wall, and the outer side wall of the side narrowing gap 404 is provided with a bend, which is outward. The middle air outlet 401 and the two side air outlets 402 form a larger air blowing area, cover a larger area of the printing roller, and improve the drying effect. The middle narrowing gap 403 (width = 2.5mm) adopts a double-bent flow guide wall (curvature radius = 8mm) to form a Venturi effect acceleration zone, and the local wind speed is increased to 18-22m / s. The side narrowing gap 404 (width = 3.2mm) is provided with a 30° outwardly expanding bend on the outer side wall, and the gas flow is guided to adhere to the roller surface by the Coanda effect. The length of the equal-width section is 15mm, which ensures that the gas flow develops a laminar boundary layer with a thickness of 0.8mm.

[0039] The drawings are attached Figure 2 The bottom horizontal surface of the pipe shell 5 has a distance from the horizontal surface of the air outlet (i.e. the middle narrowing gap 403 and the side narrowing gap 404), leaving a space for the hot air to diffuse.

[0040] The air outlet part 4 is divided into multiple air outlet cavities by a partition layer along the length direction, and the cross section of the air outlet cavity is trapezoidal. In the embodiment, the partition layer includes a first partition layer 6, a second partition layer 7, a third partition layer 8 and a fourth partition layer 9 arranged in sequence, the first partition layer 6 and the second partition layer 7 form a first air outlet cavity 601, the second partition layer 7 and the third partition layer 8 form a second air outlet cavity 601, the third partition layer 8 and the fourth partition layer 9 form a third air outlet cavity 601, and the fourth partition layer 9 and the pipe shell 5 form a fourth air outlet cavity 901. The partition layer is externally separated from a heat dissipation cavity 10, and the heat dissipation cavity 10 is connected with a heat dissipation port 3. The first partition layer 6 and the pipe shell 5 form the heat dissipation cavity 10, and the heat dissipation cavity 10 and the first air outlet cavity 601 are connected by heat radiation. The first partition layer 6, the second partition layer 7, the third partition layer 8 and the fourth partition layer 9 are all provided with bends, so that the air outlet cavity is turned from the top air inlet 1 to the left air outlet.

[0041] The air inlet area of the air outlet cavity far from the air inlet 1 is larger than other air outlet cavities.

[0042] The above description of the present application and its embodiments is illustrative, and is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this, without departing from the creative purpose of the present application, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the present application.

Claims

1. A uniform airflow duct, characterized in that, The device includes a pipe body, with an air inlet and a heat dissipation outlet at each end. The bottom surface of the pipe body has an air outlet along its length. The air outlet is divided into multiple air outlet chambers along its length by a partition layer. Each air outlet chamber has a reduced flat air outlet. The sidewall of the air outlet is an inclined wall that narrows towards the outlet.

2. The uniform airflow duct according to claim 1, characterized in that, The partition layer is separated by a heat dissipation cavity, and the heat dissipation cavity is connected to a heat dissipation port.

3. The uniform airflow duct according to claim 1, characterized in that, The air outlets are provided at least three and are symmetrically distributed.

4. The uniform airflow duct according to claim 3, characterized in that, The outlet of the air vent located at the edge is tilted towards the edge.

5. The uniform airflow duct according to claim 4, characterized in that, The outlet of the air vent has a narrow section with equal width.

6. The uniform airflow duct according to claim 1, characterized in that, The tube body is provided with a shell, and the cross-section of the shell is trapezoidal.

7. The uniform airflow duct according to claim 6, characterized in that, The cross-section of the air outlet cavity is trapezoidal.

8. The uniform airflow duct according to claim 6, characterized in that, The bottom horizontal plane of the pipe shell is at a distance from the horizontal plane of the air outlet.

9. A uniform airflow duct according to any one of claims 1 to 8, characterized in that, The air inlet area of ​​the air outlet cavity located further away from the air inlet is larger than that of other air outlet cavities.

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