Drying gas hood for papermaking

Abstract

The utility model belongs to the field of papermaking equipment, and particularly relates to a drying gas hood for papermaking. Comprising a gas hood body and an air outlet unit, the gas hood body comprises a conveying cavity, the conveying cavity is provided with a hot gas inlet and a through opening, the through opening is formed in the bottom wall of the conveying cavity in a penetrating mode in the length direction of the bottom wall of the conveying cavity, the air outlet unit is arranged at the through opening, and an air outlet of the air outlet unit is obliquely formed. Hot air sprayed by the air outlet unit flows along a gap between the drying cylinder and the bottom wall, and the direction of the hot air sprayed by the air outlet unit is opposite to the rotating direction of the drying cylinder; and a better drying effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of papermaking equipment, in particular to a drying air hood for papermaking. Background Art

[0002] In the papermaking industry, drying cylinders are key equipment for removing moisture from paper sheets during the paper production process. Drying cylinders are usually large cylindrical steel containers with built-in steam pipes to generate high temperatures and dry the paper through heat conduction. The drying cylinder hoods are located above these cylinders, and their main function is to seal the drying cylinder area, retain heat, and speed up the drying process. A Chinese patent with publication number CN114395936A discloses a hot air hood for a papermaking machine and an installation method thereof. The inner wall of the hood is provided with a plurality of nozzles, and hot air is ejected from the nozzles to dry the paper on the drying cylinder. However, the hot air ejected from the nozzles of the device lacks guidance and cannot form an effective circulation, which limits the drying efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a drying air hood for papermaking with better drying effect in view of the above-mentioned existing technical problems.

[0004] In view of this, the utility model provides a drying air hood for papermaking, comprising: an air hood body, the air hood body comprising a conveying chamber, the conveying chamber being provided with a hot air inlet; a through opening, the through opening being arranged on the bottom wall of the conveying chamber along the length direction of the bottom wall of the conveying chamber; an air outlet unit, the air outlet unit being arranged at the above-mentioned through opening, the air outlet of the air outlet unit being arranged inclined; wherein the hot air ejected by the air outlet unit flows along the gap between the drying cylinder and the bottom wall, and the direction of the hot air ejected by the air outlet unit is opposite to the rotation direction of the drying cylinder.

[0005] In the present technical solution, an external hot air source passes hot air into the conveying cavity through a hot air inlet, and the hot air changes its ejection direction through an air outlet unit arranged at the inlet in the conveying cavity. The hot air ejected by the air outlet unit flows along the gap between the drying cylinder and the bottom wall, and the direction of the hot air ejected by the air outlet unit is opposite to the rotation direction of the drying cylinder. By precisely controlling the flow direction of the hot air, it can be ensured that the heat acts on the paper more concentratedly, thereby improving the overall thermal utilization rate. Since the flow direction of the hot air is opposite to the rotation direction of the drying cylinder, a convection effect can be formed, which helps to evenly dry the paper and reduce unnecessary energy loss.

[0006] In the above technical solution, further, the air outlet unit includes a shell, which is arranged in the through opening and fixedly connected to the bottom wall, and the shell is provided with an air inlet and an air outlet, connecting the conveying cavity and the hot air action area.

[0007] In the present technical solution, the hot air action area is the gap between the drying cylinder and the bottom wall. A rectangular shell is fixed in the through opening. The outer wall of the shell and the inner wall of the vent are abutted, and can be welded to ensure air tightness and connection strength. Through the setting of the shell and the air inlet and outlet, the hot air enters the smaller shell from the larger conveying cavity, which can accelerate the discharge of the hot air from the outlet.

[0008] In the above technical solution, further, it also includes a support plate, which is arranged on the side close to the air outlet, and the support plate includes a wedge-shaped support portion and a rotating arm, the rotating arm is rotatably connected to the inner wall of the shell, and also includes an elastic member, under the action of the elastic member, the inclined surface of the wedge-shaped support portion and the inclined plate abut against each other.

[0009] In the present technical solution, the rotating arm is fixedly connected to the wedge-shaped abutting portion, and the rotating arm and the inner wall of the shell are axially connected, and also includes an elastic member. Under the action of the elastic member, the inclined surface of the wedge-shaped abutting portion abuts against the inclined plate, and hot air fills the conveying cavity and the inside of the shell. The hot air continues to flow in, and the internal air pressure continues to increase, pushing the abutting plate to rotate. The inclined surface of the wedge-shaped abutting portion no longer abuts against the inclined plate to produce an air outlet. The hot air is evenly ejected from the air outlets of multiple air outlet units to act on the paper on the drying cylinder, which can ensure that the paper is heated evenly during the drying process, prevent local overheating or moisture, and improve the uniformity of paper drying. The dispersed and uniform air outlet can achieve better heat exchange efficiency, accelerate the drying process, and reduce problems such as paper deformation, shrinkage or strength reduction caused by uneven drying, thereby ensuring the consistency and stability of paper quality.

[0010] In the above technical solution, further, the elastic member is a first spring, which is equidistantly arranged along the length direction of the shell, with one end fixedly connected to the inner wall of the shell and the other end connected to the wedge-shaped abutment portion, and the first spring is used for abutting against the abutment plate and the inclined plate.

[0011] In the present technical solution, when there is no external force, the first spring causes the inclined surface of the wedge-shaped abutment portion of the abutment plate to abut against the inclined plate, and hot air enters, filling the conveying cavity and the interior of the shell. The hot air continues to flow in, and the internal air pressure continues to increase, pushing the abutment plate to rotate. At this time, the first spring is compressed and the air outlet is opened. When the internal air pressure is lower than the external air pressure, the first spring resets and drives the inclined surface of the wedge-shaped abutment portion of the abutment plate to abut against the inclined plate again.

[0012] In the above technical solution, further, the conveying chamber is provided with a recovery chamber in the gas hood body through an isolation plate.

[0013] In the technical solution, the isolation plate is horizontally arranged at one end away from the hot air inlet, and the hot air is guided into the recovery chamber through the setting of the recovery chamber.

[0014] In the above technical solution, further, the recovery chamber is provided with a hot air recovery port, the recovery chamber is connected to a recovery pipe, and the recovery pipe is connected to an external waste heat recovery device.

[0015] In the present technical solution, the hot air that has completed drying enters the recovery chamber through the hot air recovery port, and enters the external waste heat recovery device through the connected recovery pipe for heat recovery. The waste heat recovery device is already a mature existing technology and is common knowledge that technical personnel in this field should know, so it will not be elaborated on. It can achieve more efficient energy utilization, and an air pump or load generator can be set to act on the recovery chamber through the recovery pipe to generate heat in the recovery chamber, thereby ensuring that the hot air enters the recovery chamber smoothly and as completely as possible.

[0016] In the above technical solution, further, the hot air recovery port is arranged in the tangential direction of the hot air moving along the surface of the drying cylinder.

[0017] In the present technical solution, such an arrangement can better capture and guide the hot air into the recovery chamber.

[0018] In the above technical solution, further, a plurality of recovery pipes are provided and are arranged at equal intervals.

[0019] In this technical solution, by increasing the number of recovery pipes and equidistantly arranging the recovery pipes, the retention of hot air in the recovery chamber can be reduced, air flow turbulence in the recovery chamber can be avoided, the hot air transfer efficiency can be reduced, and thus the hot air heat recovery effect can be reduced.

[0020] The beneficial effects of the utility model are:

[0021] 1. The hot air changes its ejection direction through the air outlet unit arranged at the opening in the conveying cavity. The hot air ejected by the air outlet unit flows along the gap between the drying cylinder and the bottom wall, and the direction of the hot air ejected by the air outlet unit is opposite to the rotation direction of the drying cylinder. By accurately controlling the flow direction of the hot air, it can be ensured that the heat acts on the paper more concentratedly, thereby improving the overall thermal utilization rate. Since the flow direction of the hot air is opposite to the rotation direction of the drying cylinder, a convection effect can be formed, which is conducive to uniform drying of the paper and reduces unnecessary energy loss;

[0022] 2. The rotating arm is fixedly connected to the wedge-shaped abutting part, and the rotating arm and the inner wall of the shell are connected by an axis, and also includes an elastic member. Under the action of the elastic member, the inclined surface of the wedge-shaped abutting part abuts against the inclined plate, and hot air fills the conveying cavity and the inside of the shell. The hot air continues to flow in, and the internal air pressure continues to increase, pushing the abutting plate to rotate, and the inclined surface of the wedge-shaped abutting part no longer abuts against the inclined plate to generate an air outlet. The hot air is evenly ejected from the air outlets of multiple air outlet units to act on the paper on the drying cylinder, which can ensure that the paper is heated evenly during the drying process, prevent local overheating or moisture, and improve the uniformity of paper drying. The dispersed and uniform air outlet can achieve better heat exchange efficiency, accelerate the drying process, reduce paper deformation, shrinkage or strength reduction caused by uneven drying, and ensure the consistency and stability of paper quality;

[0023] 3. The hot air that has completed drying enters the recovery chamber through the hot air recovery port, and enters the external waste heat recovery device through the connected recovery pipe for heat recovery, which can achieve more efficient energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model;

[0025] Figure 2 It is a cross-sectional view of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the air outlet unit;

[0027] Figure 4 yes Figure 2 A partial enlarged view of point A in the middle.

[0028] The symbols in the figure are:

[0029] 1. Air hood body; 2. Conveying cavity; 3. Hot air inlet; 4. Through hole; 5. Air outlet unit; 6. Bottom wall; 7. Air outlet; 8. Drying cylinder; 9. Shell; 10. Air inlet; 11. Hot air action area; 12. Abutment plate; 13. Wedge-shaped abutment portion; 14. Rotating arm; 15. Inclined plate; 16. First spring; 17. Isolation plate; 18. Recovery cavity; 19. Hot air recovery port; 20. Recovery duct. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0031] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0033] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0034] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0035] Embodiment 1:

[0036] like Figure 1-4 As shown, the present embodiment provides a drying air hood for papermaking, comprising: an air hood body 1, the air hood body 1 comprises a conveying chamber 2, the conveying chamber 2 is provided with a hot air inlet 3; a through hole 4, the through hole 4 is arranged on the bottom wall 6 of the conveying chamber 2 along the length direction of the bottom wall 6 of the conveying chamber 2; an air outlet unit 5, the air outlet unit 5 is arranged at the above-mentioned through hole 4, and the air outlet 7 of the air outlet unit 5 is inclined; wherein the hot air ejected from the air outlet unit 5 flows along the gap between the drying cylinder 8 and the bottom wall 6, and the direction of the hot air ejected from the air outlet unit 5 is opposite to the rotation direction of the drying cylinder 8. An external hot air source passes hot air into the conveying chamber 2 through the hot air inlet 3. The hot air changes its ejection direction through the air outlet unit 5 arranged at the outlet 4 in the conveying chamber 2. The hot air ejected by the air outlet unit 5 flows along the gap between the drying cylinder 8 and the bottom wall 6, and the direction of the hot air ejected by the air outlet unit 5 is opposite to the rotation direction of the drying cylinder 8. By accurately controlling the flow direction of the hot air, it can be ensured that the heat acts on the paper more concentratedly, thereby improving the overall thermal utilization rate. Since the flow direction of the hot air is opposite to the rotation direction of the drying cylinder 8, a convection effect can be formed, which is helpful to evenly dry the paper and reduce unnecessary energy loss.

[0037] The air outlet unit 5 includes a shell 9, which is arranged in the passage 4 and fixedly connected to the bottom wall 6. The shell 9 is provided with an air inlet 10 and an air outlet 7, which connect the conveying chamber 2 and the hot air action area 11. The hot air action area 11 is the gap between the drying cylinder 8 and the bottom wall 6. The rectangular shell 9 is fixedly arranged in the passage 4. The outer wall of the shell 9 and the inner wall of the vent are abutted, which can be welded to ensure air tightness and connection strength. Through the arrangement of the shell 9 and the air inlet and outlet 7, hot air enters the smaller shell 9 from the larger conveying chamber 2, which can accelerate the hot air from the air outlet 7.

[0038] Embodiment 2:

[0039] This embodiment provides a drying air hood for papermaking, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0040] like Figure 4 As shown, it also includes a support plate 12, which is arranged on the side close to the air outlet 7. The support plate 12 includes a wedge-shaped support portion 13 and a rotating arm 14. The rotating arm 14 is rotatably connected to the inner wall of the shell 9, and also includes an elastic member. Under the action of the elastic member, the inclined surface of the wedge-shaped support portion 13 and the inclined plate 15 are abutted. The rotating arm 14 is fixedly connected to the wedge-shaped abutting portion 13. The rotating arm 14 and the inner wall of the shell 9 are axially connected, and also include an elastic member. Under the action of the elastic member, the inclined surface of the wedge-shaped abutting portion 13 abuts against the inclined plate 15, and the hot air fills the conveying cavity 2 and the inside of the shell 9. The hot air continues to flow in, and the internal air pressure continues to increase, pushing the abutting plate 12 to rotate. The inclined surface of the wedge-shaped abutting portion 13 no longer abuts against the inclined plate 15 to generate the air outlet 7. The hot air is evenly ejected from the air outlet 7 of multiple air outlet units 5 to act on the paper on the drying cylinder 8, which can ensure that the paper is heated evenly during the drying process, prevent local overheating or moisture, and improve the uniformity of paper drying. The dispersed and uniform air outlet can achieve better heat exchange efficiency, accelerate the drying process, reduce paper deformation, shrinkage or strength reduction caused by uneven drying, and ensure the consistency and stability of paper quality.

[0041] The elastic member is a first spring 16, which is equidistantly arranged along the length direction of the housing 9, with one end fixedly connected to the inner wall of the housing 9 and the other end connected to the wedge-shaped abutting portion 13. The first spring 16 is used to abut the abutment plate 12 against the inclined plate 15. When there is no external force, the first spring 16 makes the inclined surface of the wedge-shaped abutting portion 13 of the abutment plate 12 abut against the inclined plate 15, and hot air enters, filling the conveying cavity 2 and the inside of the housing 9. The hot air continues to flow in, and the internal air pressure continues to rise, pushing the abutment plate 12 to rotate. At this time, the first spring 16 is compressed, opening the air outlet 7. When the internal air pressure is less than the external air pressure, the first spring 16 resets and drives the inclined surface of the wedge-shaped abutting portion 13 of the abutment plate 12 to abut against the inclined plate 15 again.

[0042] Embodiment 3:

[0043] This embodiment provides a drying air hood for papermaking, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0044] like Figure 2 As shown, the conveying chamber 2 is provided with a recovery chamber 18 in the air hood body 1 through an isolation plate 17. The isolation plate 17 is horizontally arranged at one end away from the hot air inlet, and the hot air is guided into the recovery chamber 18 through the arrangement of the recovery chamber 18.

[0045] The recovery chamber 18 is provided with a hot air recovery port 19, and the recovery chamber 18 is connected to a recovery pipe 20, and the recovery pipe 20 is connected to an external waste heat recovery device. The hot air that has completed drying enters the recovery chamber 18 through the hot air recovery port 19, and enters the external waste heat recovery device through the connected recovery pipe 20 for heat recovery. The waste heat recovery device is already a mature prior art and belongs to the common knowledge that those skilled in the art should know, so it will not be elaborated. It can achieve more efficient energy utilization. An air pump or a load generator can be set to act on the recovery chamber 18 through the recovery pipe 20, and generate heat in the recovery chamber 18 to ensure that the hot air enters the recovery chamber 18 smoothly and as completely as possible.

[0046] The hot air recovery port 19 is arranged in the tangential direction of the hot air moving along the surface of the drying cylinder 8. Such arrangement can better capture and guide the hot air into the recovery chamber 18.

[0047] There are a plurality of recovery pipes 20, which are arranged at equal distances. By increasing the number of recovery pipes 20 and arranging the recovery pipes 20 at equal distances, the retention of hot air in the recovery chamber 18 can be reduced, air flow turbulence in the recovery chamber 18 can be avoided, and the hot air transfer efficiency can be reduced, thereby reducing the hot air heat recovery effect.

[0048] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A drying hood for papermaking, characterized in that: include: A gas hood body (1), the gas hood body (1) comprising a conveying cavity (2), the conveying cavity (2) being provided with a hot gas inlet (3); A through opening (4), wherein the through opening (4) is arranged on the bottom wall (6) of the conveying cavity (2) and extends through the bottom wall (6) of the conveying cavity (2) along the length direction of the bottom wall (6) of the conveying cavity (2); An air outlet unit (5), the air outlet unit (5) being arranged at the through opening (4), and the air outlet (7) of the air outlet unit (5) being arranged at an angle; The hot air ejected from the air outlet unit (5) flows along the gap between the drying cylinder (8) and the bottom wall (6), and the direction of the hot air ejected from the air outlet unit (5) is opposite to the rotation direction of the drying cylinder (8).

2. A drying hood for papermaking according to claim 1, characterized in that: The air outlet unit (5) comprises a shell (9), the shell (9) is arranged in the through opening (4) and fixedly connected to the bottom wall (6), the shell (9) is provided with an air inlet (10) and an air outlet (7), and is connected to the conveying cavity (2) and the hot air action area (11).

3. A drying hood for papermaking according to claim 2, characterized in that: The invention also includes a support plate (12), the support plate (12) being arranged on a side close to the air outlet (7), the support plate (12) including a wedge-shaped support portion (13) and a rotating arm (14), the rotating arm (14) being rotatably connected to the inner wall of the shell (9), and also including an elastic member, under the action of which the inclined surface of the wedge-shaped support portion (13) and the inclined plate (15) are in contact with each other.

4. A drying hood for papermaking according to claim 3, characterized in that: The elastic member is a first spring (16), which is equidistantly arranged along the length direction of the shell (9), one end of which is fixedly connected to the inner wall of the shell (9), and the other end of which is connected to the wedge-shaped abutting portion (13), and the first spring (16) is used for abutting against the abutting plate (12) and the inclined plate (15).

5. A drying hood for papermaking according to claim 1, characterized in that: The conveying chamber (2) is provided with a recovery chamber (18) in the gas hood body (1) via an isolation plate (17).

6. A drying hood for papermaking according to claim 5, characterized in that: The recovery chamber (18) is provided with a hot air recovery port (19), the recovery chamber (18) is connected to a recovery pipe (20), and the recovery pipe (20) is connected to an external waste heat recovery device.

7. A drying hood for papermaking according to claim 6, characterized in that: The hot air recovery port (19) is arranged in the tangential direction of the hot air moving along the surface of the drying cylinder (8).

8. A drying hood for papermaking according to claim 7, characterized in that: The recovery pipes (20) are provided in a plurality and are arranged at equal intervals.

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