Drying box tuyere

Abstract

The drying box tuyere comprises a bent plate and a U-shaped plate, the bent plate with air outlet holes is welded to the U-shaped plate, the bent plate is completely and symmetrically distributed relative to the U-shaped plate, a bottom plate is welded to the lower end of the bent plate, and sealed end plates are welded to the two ends of the bottom plate; the device is high in heat transfer efficiency and reduces the blocking frequency of the drying box.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking machinery, and in particular to a drying box air nozzle. Background Art

[0002] The structural form of the air nozzle of the flotation drying box in the papermaking industry directly affects the drying capacity. Most of the existing air nozzles use slit-type air outlets. The manufacturing process is not easy to ensure that the gap of the air nozzle is uniform. The size of the slit-type air nozzle is inconsistent in each section, and the uniformity of heat transfer is poor, which cannot make the paper sheets move forward in a better sinusoidal flotation state.

[0003] The patent No. 202123206757.0, section

[0016] , includes an outer frame 1, an inner frame 2 and a fixing block 3. The outer frame 1 has end plates 5 at both ends. Figure 3 As shown, the outer frame 1 is symmetrically designed in the width direction, with an air inlet 8 at the bottom and an opening at the top. Both side walls of the opening are bent inwardly, and the bending angle is α. The bending angle α of the outer frame is 120°~150°; the fixed block 3 is fixed to the inside of the outer frame 1 near the opening by a rivet 4, the inner frame 2 is located inside the outer frame 1, and is fixed on the fixed block 3, the fixed block 3 is discontinuous in the length direction, and an asymmetric first gap 6 and a second gap 7 are generated between the bent side walls of the inner frame 2 and the outer frame 1. The width of the first gap 6 is a, and the width of the second gap 7 is b. The values ​​of a and b are 1.5~3mm, the inner frame bending angle β at the first gap 6 and the inner frame bending angle γ at the second gap 7, the two gap widths are the same when they are different from the two bending angles. The two gap widths and the two inner frame bending angles are different. When the two gap widths a and b are the same, the two inner frame bending angles β and γ are different; when the two gap widths a and b are different, the two inner frame bending angles β and γ can be the same; the best case is that the two gap widths a and b are different, and the two inner frame bending angles β and γ are also different. The inner frame bending angle β is 100°~140°, and the inner frame bending angle γ is 120°~150°. The upper opening in this patent adopts an asymmetric design, which cannot solve the problem of drying box clogging. Utility Model Content

[0004] The technical problem to be solved by the present application is that the sizes of various cross sections of the slot-type air nozzles in the prior art are inconsistent, and the uniformity of heat transfer is poor.

[0005] The specific plan is as follows:

[0006] A drying box air nozzle comprises a bent plate and a U-shaped plate, wherein the U-shaped plate is welded with a bent plate with air outlet holes, a bottom plate is welded on the bent plate, the bent plates are completely symmetrically distributed with respect to the U-shaped plate, sealed end plates are welded at both ends of the bottom plate, and an air inlet is arranged on the bottom plate.

[0007] Furthermore, the bending plate includes a first inclined plate, a connecting plate and a second inclined plate, the first inclined plate is connected to the connecting plate and the second inclined plate in sequence, the first inclined plate is connected to the U-shaped plate, and the second inclined plate is connected to the bottom plate.

[0008] Furthermore, the connecting portion between the connecting plate and the first inclined plate is a horizontal plate, and the angle between the horizontal plate and the first inclined plate is 120°~150°.

[0009] Furthermore, the included angle between the second inclined plate and the bottom plate is an acute angle, and the acute angle is 60° to 80°.

[0010] Furthermore, the first inclined plate and the horizontal plate are both provided with evenly distributed air outlet holes, and the air outlet holes on the horizontal plate are arranged in multiple rows.

[0011] Furthermore, the air outlet holes on the second inclined plate are arranged in a single row, and the distance between two adjacent air outlet holes is 30-60 mm.

[0012] Furthermore, the air outlet holes on the horizontal plate are arranged in three rows, and the air outlet holes in each row on the horizontal plate are arranged in a staggered manner, and the distance between two adjacent air outlet holes is 8-20 mm.

[0013] Furthermore, the diameter of the air outlet is 3-8 mm.

[0014] Furthermore, the top of the U-shaped plate is 5 to 15 mm higher than the horizontal plate.

[0015] Furthermore, the drying box air nozzles are arranged in two rows, upper and lower, and the two rows of drying box air nozzles are staggered according to the U-shaped plate.

[0016] Compared with the existing technology, the beneficial effects are:

[0017] (1) A drying box air nozzle comprises a bent plate and a U-shaped plate, wherein the U-shaped plate is welded with a bent plate with air outlet holes, a bottom plate is welded on the bent plate, the bent plates are completely symmetrically distributed with respect to the U-shaped plate, sealed end plates are welded at both ends of the bottom plate, and a plurality of air inlets are arranged on the bottom plate, thereby improving the heat transfer speed.

[0018] (2) The air outlet of this device is not easily blocked by paper scraps, thus reducing the number of downtimes.

[0019] (3) The device of the utility model is simple to manufacture, beautiful in appearance and high in precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a vertical section of the utility model.

[0021] Figure 2 It is a top view of the utility model.

[0022] Figure 3 This is a diagram showing the arrangement of drying box air nozzles in a drying box of the utility model.

[0023] Among them, 1 is a bending plate, 2 is a U-shaped plate, 3 is a bottom plate, 4 is an end plate, 5 is an air inlet, 11 is a first inclined plate, 12 is a connecting plate, 13 is a second inclined plate, and 14 is an air outlet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the present invention.

[0025] A drying box nozzle, such as Figure 1-3 As shown, it belongs to the field of papermaking machinery technology, including a bending plate 1 and a U-shaped plate 2, the U-shaped plate 2 is welded with a bending plate with air outlets, the bending plate 1 is completely symmetrically distributed with respect to the U-shaped plate 2, and the air outlets 14 on the bending plate 1 are completely symmetrically distributed with the bending plate 1 with respect to the U-shaped plate 2 according to the following text to form corresponding air outlets, when hot air enters from the air inlet 5 of the bottom plate 3, the hot air is evenly distributed and sprayed out along the air outlet holes 14 to ensure that the paper is heated evenly, the bottom plate 3 is welded on the bending plate 1, the bottom of the bottom plate 3 is provided with an air inlet 5, the drying box air nozzle is welded with an end plate 4 for sealing, and a plurality of air inlets 5 are provided on the bottom plate 3.

[0026] Because the air outlet holes 14 have the same size, the cross-sections of the hot air flow are the same when they flow out of the air outlet holes 14, making the heat transfer more uniform and energy-saving.

[0027] The bending plate 1 includes a first inclined plate 11, a connecting plate 12 and a second inclined plate 13. The first inclined plate 11 is connected to the connecting plate 12 and the second inclined plate 13 in sequence. The first inclined plate 11 is connected to the U-shaped plate 2, and the second inclined plate 13 is connected to the bottom plate 4. The first inclined plate 11, the connecting plate 12 and the second inclined plate 13 are bent from a whole plate to form an integrated structure.

[0028] The connecting part between the connecting plate 13 and the first inclined plate 11 is a horizontal plate, the angle between the horizontal plate and the first inclined plate 11 is 120°~150°, the angle between the first inclined plate and the side of the U-shaped plate 2 is an acute angle, and the hot air is ejected from the air outlet on the first inclined plate 11, part of the hot air is blocked by the side wall of the U-shaped plate 2, and part of the hot air forms a hot air flow that moves upward perpendicular to the first inclined plate 11.

[0029] The angle between the second inclined plate 13 and the bottom plate 4 is an acute angle, and the angle of the acute angle is 60°~80°. The angle between the horizontal plate and the first inclined plate 11, and the angle between the second inclined plate 13 and the bottom plate 4 are all determined according to the paper machine speed, the paper weight, the fan pressure, etc.

[0030] The first inclined plate 11 and the horizontal plate are both provided with evenly distributed air outlet holes 14, the air outlet holes 14 on the horizontal plate are arranged in multiple rows, and the air outlet holes 14 on the first inclined plate 11 are arranged in a single row, the hot air flow direction moves upward along the air outlet holes 14 perpendicular to the first inclined plate 11, and a part of the hot air discharged by the air outlet holes 14 on the first inclined plate 11 will be blocked by the U-shaped plate 2 in the morning, and the distance between two adjacent air outlet holes 14 is 8~20mm, and the air outlet holes 14 on the horizontal plate are arranged in three rows, and the rows of air outlet holes 14 on the horizontal plate are staggered, and the distance between two adjacent air outlet holes 14 is 30~60mm. Such uniform arrangement of the air outlet holes 14 makes the air flow ejected from the air outlet holes 14 more uniform.

[0031] The density of the air outlet holes 14 on the first inclined plate 11 is greater than that on the horizontal plate, so as to facilitate the formation of a sinusoidal curve.

[0032] The aperture of the air outlet 14 is 3-8 mm, and it is not easy for the paper to enter the air outlet during the operation of the paper machine, thereby causing blockage.

[0033] The top of the U-shaped plate 2 is 5-15 mm higher than the horizontal plate. Combined with the setting of the bending plate 1, when the device is working, the paper can better move between the air nozzles in the drying box in a sinusoidal air floating state.

[0034] When the device is working, hot air enters the device from the air inlet 5 at the bottom of the bottom plate 4, and then the hot air flows out of the air outlet 14 of the connecting plate in a direction perpendicular to the connecting plate 12 and moves upward. The hot air flows out of the air outlet 14 on the first inclined plate 11 and moves upward in a direction perpendicular to the first inclined plate 11. The top of the U-shaped plate 2 is 5 to 15 mm higher than the horizontal plate. The air nozzle of the drying box is as follows: Figure 3 As shown in the upper and lower staggered arrangement, when the hot air flow passes through the air nozzle of the drying box, the paper can float under the action of the air flow. The floating movement of the paper is just advancing in a sinusoidal air flotation state. Since the aperture of the air outlet 14 is less than 8mm, it greatly reduces the amount of broken paper scraps entering the drying box and clogging the air nozzle of the drying box.

[0035] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A drying box air nozzle, comprising a bent plate and a U-shaped plate, characterized in that: The U-shaped plate is welded with a bent plate with air outlets, the bent plates are completely symmetrically distributed about the U-shaped plate, the lower end of the bent plate is welded with a bottom plate, sealed end plates are welded at both ends of the bottom plate, and a plurality of air inlets are arranged on the bottom plate.

2. The drying box air nozzle according to claim 1, characterized in that: The bending plate comprises a first inclined plate, a connecting plate and a second inclined plate, wherein the first inclined plate is connected to the connecting plate and the second inclined plate in sequence, the first inclined plate is connected to the U-shaped plate, and the second inclined plate is connected to the bottom plate.

3. The drying box air nozzle according to claim 2, characterized in that: The connecting part between the connecting plate and the first inclined plate is a horizontal plate, the angle between the horizontal plate and the first inclined plate is 120°~150°, the angle between the second inclined plate and the bottom plate is an acute angle, and the angle of the acute angle is 60°~80°.

4. The drying box air nozzle according to claim 3, characterized in that: The first inclined plate and the horizontal plate are both provided with evenly distributed air outlet holes, and the air outlet holes on the horizontal plate are arranged in multiple rows.

5. The drying box air nozzle according to claim 4, characterized in that: The air outlet holes on the first inclined plate are arranged in a single row, and the distance between two adjacent air outlet holes is 8-20 mm.

6. The drying box air nozzle according to claim 5, characterized in that: The air outlet holes on the horizontal plate are arranged in three rows, and the air outlet holes in each row on the horizontal plate are arranged in a staggered manner, and the distance between two adjacent air outlet holes is 30-60 mm.

7. The drying box air nozzle according to claim 6, characterized in that: The diameter of the air outlet hole is 3-8 mm.

8. The drying box air nozzle according to claim 7, characterized in that: The top of the U-shaped plate is 5-15 mm higher than the horizontal plate.

9. A drying box air nozzle according to any one of claims 1 to 8, characterized in that: The drying box air nozzles are arranged in two rows, upper and lower, and the two rows of drying box air nozzles are staggered according to the U-shaped plate.

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