Cooling air knife and air knife assembly adopting same

Abstract

The utility model discloses a cooling air knife and an air knife assembly adopting the cooling air knife. The cooling air knife comprises a box body, a cooling air duct is arranged in the box body, the cooling air duct comprises a cold air cavity, a plurality of air inlet holes are formed in the side wall of one side of the cold air cavity, an exhaust seam is formed in the side wall of the other side of the cold air cavity, and the box body is provided with a cooling water duct close to the exhaust seam. The pre-cooling device solves the problem of poor pre-cooling effect in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of air knife components, and in particular to a cooling air knife and an air knife assembly using the cooling air knife. Background Technology

[0002] A Chinese utility model patent with publication number CN207014762U, entitled "A Hollow Board Shaping Table Equipped with a Pre-cooling Device," describes an upper and lower air knife assembly that both include a main air pipe connected to a cooling dryer, several branch air pipes extending from the main air pipe, and an air box connected to the branch air pipes. The air box is rectangular in shape, and the branch air pipes are evenly distributed on the top surface of the air box. An air outlet slit is provided on the bottom surface of the air box for exhaust. The arrangement of the branch air pipes ensures that the cooling air sprayed from the air box reaches the surface of the hollow board evenly, resulting in uniform heat dissipation across the entire hollow board. The cooling air is output from the air outlet slit and maintains a certain pressure to ensure effective heat dissipation. However, because the upper and lower air knife assemblies are close to the extrusion die of the hollow board, relying solely on cooling air results in poor pre-cooling effect. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a cooling air knife that can improve the precooling effect.

[0004] To achieve the above objectives, the technical solution adopted by the cooling air knife of this utility model is as follows:

[0005] A cooling air knife includes a housing, a cooling air duct is provided inside the housing, the cooling air duct includes a cold air chamber, a plurality of air inlets are provided on one side wall of the cold air chamber, an exhaust slit is provided on the other side wall, and a cooling water channel is provided next to the exhaust slit in the housing.

[0006] Preferably, the side wall of the cold air cavity facing the air inlet has a first-stage tapering channel, and the side with the smaller cross-section of the first-stage tapering channel is connected to the exhaust slit.

[0007] Preferably, a secondary tapered channel is provided on the side with the smaller cross-section of the primary tapered channel. The contraction angle of the secondary tapered channel is smaller than that of the primary tapered channel, and the side with the smaller cross-section of the secondary tapered channel is connected to the exhaust vent.

[0008] Preferably, the exhaust slit is arranged at an angle.

[0009] Preferably, the housing is made of aluminum alloy.

[0010] To achieve the above objectives, the technical solution adopted by the air knife assembly of this utility model using the cooling air knife is as follows:

[0011] An air knife assembly employing the cooling air knife includes a main air duct, and a plurality of cold air branch pipes are provided on the side wall of the main air duct. One end of the cold air branch pipe is connected to the main air duct, and the other end is connected to the cooling air knife.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. The enclosure is equipped with cooling air ducts and cooling water ducts, combining air cooling and water cooling to improve the cooling effect.

[0014] 2. The cold air is discharged through the primary and secondary gradually narrowing channels and the inclined exhaust slits, which effectively solves the problem of uneven airflow from the exhaust slits, avoids the appearance of patterns on the hollow board, and improves product quality. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the cooling air knife of this utility model.

[0016] Figure 2 This is a schematic diagram of the air knife assembly using the cooling air knife of this utility model.

[0017] Figure 3 This is a schematic diagram of the application of the air knife assembly using this cooling air knife.

[0018] Among them, 1 is a cooling air knife, 11 is a cooling air duct, 111 is a cold air cavity, 112 is an air inlet, 113 is a primary tapering channel, 114 is a secondary tapering channel, 115 is an exhaust slit, 12 is a cooling water channel, 2 is a main cold air pipe, 3 is a branch cold air pipe, and 4 is a shaping table. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0020] like Figure 1As shown, a cooling air knife 1 includes a housing made of aluminum alloy. Aluminum alloy has good thermal conductivity, which is beneficial to improving the pre-cooling effect of hollow panels. A cooling air duct 11 is provided inside the housing, including a cold air cavity 111. The cold air cavity is a strip-shaped structure parallel to the length direction of the housing, and the cross-section of the strip-shaped structure is a rounded square. Several air inlets 112 are opened on the top side wall of the cold air cavity. The air inlets are arranged in a straight line along the length direction of the housing and are evenly distributed. A first-stage tapering channel 113 is opened on the bottom side wall of the cold air cavity. The first-stage tapering channel is formed by a first slope facing the air inlet and the extended surface of the right side wall of the cold air cavity. The included angle between the first slope and the right side wall of the cold air cavity is the contraction angle of the first-stage tapering channel. The contraction angle is 60°. The large contraction angle rapidly increases the flow rate. At the same time, the flow guiding structure (first slope) reduces turbulence and avoids uneven cooling caused by airflow disturbance. A second-level contraction channel 114 is opened on the side with the smaller cross-section of the first-level contraction channel. The second-level contraction channel is composed of a second slope connected to the first slope and the extended surface of the right side wall of the cold air cavity. The included angle between the second slope and the right side wall of the cold air cavity is the contraction angle of the second-level contraction channel, which is 10°. The second-level contraction channel connected in series with the first-level contraction channel achieves precise airflow focusing with a smaller contraction angle and further increases the wind speed. The high-speed airflow can significantly improve the convective heat transfer coefficient, increasing the heat exchange efficiency of the hollow plate surface by more than 30%. An exhaust slit 115 is opened on the side with the smaller cross-section of the second-level contraction channel. The exhaust slit is arranged at an angle to avoid airflow rebound and turbulence. Condensate accumulates on the surface of the hollow plate. A cooling water channel 12 is opened next to the exhaust slit in the box body. The cooling water channel is parallel to the exhaust slit.

[0021] like Figure 2-3 As shown, an air knife assembly using the cooling air knife includes a main air duct 2, several branch air ducts 3 are installed on the side wall of the main air duct, one end of the branch air duct is connected to the main air duct, and the other end is connected to the cooling air knife. The inner cavity of the main air duct is connected to the cold air cavity through the branch air ducts.

[0022] The specific working process and principle of the air knife assembly using this cooling air knife in this utility model are as follows: The air knife assembly is symmetrically installed at the feed end of the shaping table 4, and simultaneously connected to cold air and cold water. After the cold air enters the main cold air duct, it enters the cold air chamber through various cold air branch pipes, and then flows in layers through primary and secondary gradually narrowing channels to ensure that the cold air is evenly discharged from the exhaust vents, pre-cooling the hollow board. At the same time, the cold water completes heat exchange through the cooling water channel, improving the pre-cooling effect of the hollow board. This utility model improves the pre-cooling effect of the hollow board through dual measures of air cooling and water cooling, and optimizes the cooling air channel to ensure uniform airflow, avoid the formation of patterns on the hollow board, and improve product quality.

Claims

1. A cooling air knife, characterized in that: The enclosure includes a housing, which contains a cooling air duct. The cooling air duct includes a cold air chamber. Several air inlets are provided on one side wall of the cold air chamber, and an exhaust slit is provided on the other side wall. A cooling water channel is provided on the housing next to the exhaust slit.

2. The cooling air knife according to claim 1, characterized in that: The cold air cavity has a first-stage tapering channel on the side wall opposite the air inlet, and the side with the smaller cross-section of the first-stage tapering channel is connected to the exhaust slit.

3. The cooling air knife according to claim 2, characterized in that: A secondary tapered channel is provided on the side with the smaller cross-section of the primary tapered channel. The contraction angle of the secondary tapered channel is smaller than that of the primary tapered channel. The side with the smaller cross-section of the secondary tapered channel is connected to the exhaust vent.

4. The cooling air knife according to claim 3, characterized in that: The exhaust slits are arranged at an angle.

5. The cooling air knife according to claim 3, characterized in that: The enclosure is made of aluminum alloy.

6. An air knife assembly employing the cooling air knife as described in any one of claims 1-5, characterized in that: It includes a main cold air duct, and several cold air branch ducts are installed on the side wall of the main cold air duct. One end of the cold air branch duct is connected to the main cold air duct, and the other end is connected to the cooling air knife.

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