Symmetrical hot air nozzle

Abstract

The utility model relates to the technical field of papermaking machinery, in particular to a symmetrical hot air nozzle which comprises a hollow nozzle body and a nozzle core, and an air inlet is formed in the bottom of the nozzle body and used for introducing hot air. The nozzle core is fixed in an inner cavity of the nozzle body and divides the inner cavity into two flow channel cavities which are symmetrical left and right, each flow channel cavity is communicated with a hollow wing part through a through hole, and the wing parts are symmetrically arranged on the two sides of the nozzle body. The part, close to the nozzle body, of the top face of the wing portion inclines downwards to form an inclined flow guide face, the other part horizontally extends to form a horizontal flow guide face, and air outlet holes are formed in the inclined flow guide face and the horizontal flow guide face. The utility model provides a symmetrical hot air nozzle, which improves the quality and efficiency of paper web drying by optimizing air flow distribution and enhancing the stability of paper web operation, and solves the problems of large deviation of transverse water content of a paper web and higher risk of paper breakage caused by non-uniform air flow distribution of the existing hot air nozzle.

Description

Technical Field

[0001] This utility model relates to the field of papermaking machinery technology, and in particular to a symmetrical hot air nozzle. Background Technology

[0002] In the papermaking industry, paper web drying is a crucial step that directly impacts the quality of the final product and production efficiency. To achieve an efficient drying process, hot air nozzles are typically used to dry the coated, sized, or wetted paper web.

[0003] Traditional hot air nozzles often employ a symmetrical design, offering advantages such as simple structure and low manufacturing cost, and are therefore still widely used in medium- and low-speed paper machines. For example, the utility model patent with authorization announcement number CN218983486U discloses a hot air nozzle structure that, to a certain extent, meets the basic requirements of the drying process.

[0004] However, existing hot air nozzles mostly blow hot air onto the paper web surface in a vertical spray manner. This easily causes the paper web surface to be "overly dry in the center and under-dried at the edges," resulting in a large deviation in the transverse moisture content of the paper web, which seriously affects the physical properties of the paper web and the consistency of the finished product. In addition, the vertically sprayed airflow is prone to causing paper web resonance and vibration, leading to unstable paper web operation, increased risk of paper breakage, and affecting production continuity and efficiency. Utility Model Content

[0005] In view of this, this utility model proposes a symmetrical hot air nozzle, which improves the quality and efficiency of paper drying by optimizing airflow distribution and enhancing paper web running stability, and solves the problem of large deviation in transverse moisture content of paper web and high risk of paper breakage caused by uneven airflow distribution in existing hot air nozzles.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a symmetrical hot air nozzle, including a hollow nozzle body and a nozzle core, wherein...

[0008] The nozzle body has an air inlet at the bottom for introducing hot air;

[0009] The nozzle core is fixed in the inner cavity of the nozzle body, and the inner cavity is divided into two left and right symmetrical flow channel cavities. Each flow channel cavity is connected to a hollow wing through a through hole. The wing is symmetrically arranged on both sides of the nozzle body.

[0010] The portion of the top surface of the wing near the nozzle body is inclined downward to form an inclined guide surface, while the remaining portion extends horizontally to form a horizontal guide surface. Air outlet holes are provided on both the inclined and horizontal guide surfaces.

[0011] Based on the above technical solutions, preferably, the air inlet is centrally located at the bottom of the nozzle body.

[0012] Based on the above technical solutions, preferably, the through hole is formed on the side wall of the nozzle body, wherein,

[0013] The central axis of the through hole is perpendicular to the side wall of the nozzle body.

[0014] Based on the above technical solutions, preferably, the central axis of the air outlet on the horizontal guide surface is perpendicular to the horizontal guide surface, and the central axis of the air outlet on the inclined guide surface is perpendicular to the inclined guide surface.

[0015] Based on the above technical solutions, preferably, the bottom surface of the inner cavity of the wing is inclined to guide the airflow upward.

[0016] Based on the above technical solutions, preferably, the portion of the flow channel cavity near the through hole is slit-shaped.

[0017] Based on the above technical solutions, preferably, both the nozzle body and the nozzle core are axisymmetric structures, wherein,

[0018] The top of the nozzle core is fixed to the top of the inner cavity of the nozzle body;

[0019] The top surface of the nozzle body is horizontally positioned.

[0020] Both the side of the nozzle body and the side of the nozzle core are inclined, and the inclination angles of the two are the same.

[0021] Based on the above technical solutions, preferably, the bottom surface of the nozzle core is inclined to guide the airflow upward.

[0022] The bottom and side surfaces of the nozzle core form an arc-shaped transition.

[0023] Based on the above technical solutions, preferably, the nozzle body, the nozzle core, and the wing are an integral structure.

[0024] Based on the above technical solutions, preferably, the air inlet hole is provided with internal threads on its hole wall.

[0025] The symmetrical hot air nozzle of this invention has the following advantages over the prior art:

[0026] (1) By setting a nozzle core inside the nozzle body, the inner cavity is divided into two symmetrical flow channels, and hollow wings with inclined and horizontal guide surfaces are symmetrically arranged on both sides of the nozzle body. This allows hot air to be sprayed out evenly from the air outlets on these two guide surfaces in multiple directions, effectively reducing the transverse moisture content deviation of the paper web and improving the physical properties and finished product consistency of the paper web. At the same time, the symmetrically distributed inclined airflow and the paper web running direction form a synergistic buffering effect, which helps to reduce the amplitude of paper web shaking, improve its running stability, reduce the risk of paper breakage, and ensure the continuity and efficiency of production.

[0027] (2) By designing the part of the flow channel cavity near the through hole as a slit structure, the airflow can be rectified and accelerated, improving the uniformity of airflow distribution, reducing pressure fluctuations and velocity gradient differences, thereby significantly improving the control accuracy and drying efficiency of the hot air nozzle under high-speed conditions.

[0028] (3) By setting an inclined structure at the bottom of the nozzle core and adopting an arc transition design at the junction with the side wall, the impact and separation of the airflow at the inlet can be effectively alleviated, so that the airflow can enter the diversion chamber more smoothly, improving the airflow introduction efficiency, reducing energy consumption, and also helping to achieve low noise operation and improve the user experience of the equipment.

[0029] (4) By designing the nozzle body, nozzle core and wing as an integrated structure, the overall structure is simplified, the processing and assembly difficulty is reduced, and the sealing and connection strength between the components are enhanced. It is suitable for long-term stable operation in complex working environments such as high temperature and high pressure, and has good maintainability and reliability. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the internal structure of a symmetrical hot air nozzle according to the present invention;

[0032] Figure 2 This is a diagram illustrating the airflow direction of a symmetrical hot air nozzle according to this utility model.

[0033] In the figure: 1. Nozzle body; 2. Nozzle core; 11. Wing; 101. Air inlet; 102. Flow channel cavity; 103. Through hole; 1101. Air outlet. Detailed Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] like Figure 1-2 As shown, a symmetrical hot air nozzle of this utility model includes a hollow nozzle body 1 and a nozzle core 2 fixed in the inner cavity of the nozzle body 1.

[0036] The nozzle body 1 has an air inlet 101 at its bottom for introducing hot air. The nozzle core 2 divides the inner cavity into two symmetrical flow channel chambers 102. Each flow channel chamber 102 is connected to a hollow wing 11 through a through hole 103. The wing 11 is symmetrically arranged on both sides of the nozzle body 1. The top surface of the wing 11 near the nozzle body 1 slopes downward to form an inclined guide surface, while the remaining part extends horizontally to form a horizontal guide surface. Air outlets 1101 are provided on both the inclined and horizontal guide surfaces.

[0037] In this structure, the air outlets 1101 on the inclined guide surface cooperate with those on the horizontal guide surface, allowing hot air to be evenly ejected from the air outlets 1101 in multiple directions. This effectively reduces the transverse moisture content deviation of the paper web, improving the physical properties of the paper web and the consistency of the finished product. Simultaneously, the symmetrically distributed inclined airflow and the paper web's running direction create a synergistic buffering effect, helping to reduce the amplitude of paper web shaking, improve its operational stability, reduce the risk of paper breakage, and ensure continuous and efficient production.

[0038] In the aforementioned symmetrical hot air nozzle structure, the air inlet 101 is centrally located at the bottom of the nozzle body 1. This facilitates uniform airflow distribution within the nozzle body 1, reducing pressure loss or excessively high local air velocity caused by flow deviation, thereby improving overall hot air utilization and drying efficiency, and further enhancing system stability.

[0039] In addition, the air inlet 101 has an internal thread structure on its wall, which facilitates connection with the air supply duct, thereby improving the ease of installation of the nozzle.

[0040] In the aforementioned symmetrical hot air nozzle structure, a through hole 103 is formed on the side wall of the nozzle body 1, wherein the central axis of the through hole 103 is perpendicular to the side wall of the nozzle body 1. This helps to achieve a smooth transition of airflow into the inner cavity of the wing 11, reduce flow resistance and turbulence disturbance, improve airflow distribution efficiency, ensure uniform airflow on both sides of the wing 11, and improve the working performance of the hot air nozzle.

[0041] In the aforementioned symmetrical hot air nozzle structure, the central axis of the air outlet 1101 on the horizontal guide surface is perpendicular to the horizontal guide surface, allowing the hot air flow to be ejected in a vertical direction. The central axis of the air outlet 1101 on the inclined guide surface is perpendicular to the inclined guide surface, causing the hot air flow to be ejected in an inclined direction. This achieves multi-angle, directional, and controllable airflow distribution, improves the hot air coverage and drying uniformity, and enhances the nozzle's adaptability to different working conditions.

[0042] In the aforementioned symmetrical hot air nozzle structure, the bottom surface of the inner cavity of the wing 11 is inclined to guide the airflow upward. This directs the airflow towards the nozzle outlet, reducing eddies and stagnant areas, improving airflow utilization efficiency, and enhancing the overall heat exchange and drying capacity of the nozzle. It is particularly suitable for paper drying under medium to low machine speed conditions.

[0043] In the aforementioned symmetrical hot air nozzle structure, the portion of the flow channel cavity 102 near the through hole 103 is slit-shaped. This slit-shaped flow channel can rectify and accelerate the airflow, helping to form a more stable and uniform airflow distribution, reducing pressure fluctuations and velocity gradient differences, thereby improving the control accuracy and drying effect of the hot air nozzle under high-speed operation.

[0044] In the aforementioned symmetrical hot air nozzle structure, both the nozzle body 1 and the nozzle core 2 are axisymmetric structures, with the top of the nozzle core 2 fixed to the top of the inner cavity of the nozzle body 1. The top surface of the nozzle body 1 is horizontal. The sides of both the nozzle body 1 and the nozzle core 2 are inclined, and their inclination angles are the same.

[0045] The axisymmetric structure not only facilitates the manufacturing of the nozzle but also ensures that the airflow paths on both sides are completely consistent, improving airflow symmetry and the uniformity of hot air distribution. In addition, the synchronous tilting design of the nozzle body 1 and the nozzle core 2 helps to optimize airflow guidance, making the airflow enter the wing 11 more smoothly and enhancing the overall working stability of the nozzle.

[0046] In the aforementioned symmetrical hot air nozzle structure, the bottom surface of the nozzle core 2 is inclined to guide the airflow upward, and the junction between the bottom surface and the side surface of the nozzle core 2 is arc-shaped. This structure effectively reduces the impact and separation of airflow at the inlet, allowing the airflow to be evenly distributed and smoothly enter each flow channel cavity 102, improving airflow introduction efficiency, reducing energy consumption, and enhancing the low-noise operation performance of the nozzle.

[0047] In the above-mentioned symmetrical hot air nozzle structure, the nozzle body 1, nozzle core 2, and wing 11 are integrated into one piece. This not only simplifies the overall structure and reduces the difficulty of processing and assembly, but also enhances the sealing and connection strength between components. It is suitable for long-term stable operation in complex working environments such as high temperature and high pressure, and has good maintainability and reliability.

[0048] The method of using a symmetrical hot air nozzle of this utility model is as follows:

[0049] In use, first connect the air inlet 101 of the nozzle body 1 to the external air supply duct. During air supply, refer to... Figure 2 In the diagram, the arrows indicate the direction of hot air flow. Specifically, hot air enters the nozzle body 1 through the air inlet 101 and is diverted by the nozzle core 2 located within its inner cavity, ensuring even distribution of airflow to the flow channel cavities 102 on both sides. Subsequently, the hot air enters the inner cavity of the hollow wing portion 11 through the through hole 103 and is finally ejected from the air outlet 1101 located on the guide surface. The air outlet 1101 on the horizontal guide surface ejects hot air vertically, while the air outlet 1101 on the inclined guide surface ejects hot air in an inclined direction, thereby achieving a multi-angle, full-coverage hot air drying effect and improving the uniformity of transverse drying and overall operational stability of the paper.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A symmetrical hot air nozzle, comprising a hollow nozzle body (1), characterized in that: It also includes the nozzle core (2), wherein, The nozzle body (1) has an air inlet (101) at the bottom for introducing hot air; The nozzle core (2) is fixed in the inner cavity of the nozzle body (1) and divides the inner cavity into two left and right symmetrical flow channel cavities (102). Each flow channel cavity (102) is connected to a hollow wing (11) through a through hole (103). The wing (11) is symmetrically arranged on both sides of the nozzle body (1). The top surface of the wing (11) near the nozzle body (1) is inclined downward to form an inclined guide surface, and the remaining part extends horizontally to form a horizontal guide surface. An air outlet (1101) is provided on both the inclined guide surface and the horizontal guide surface.

2. A symmetrical hot air nozzle as described in claim 1, characterized in that: The air inlet (101) is centrally located at the bottom of the nozzle body (1).

3. A symmetrical hot air nozzle as described in claim 1, characterized in that: The through hole (103) is formed on the side wall of the nozzle body (1), wherein, The central axis of the through hole (103) is perpendicular to the side wall of the nozzle body (1).

4. A symmetrical hot air nozzle as described in claim 1, characterized in that: The central axis of the air outlet (1101) on the horizontal guide surface is perpendicular to the horizontal guide surface, and the central axis of the air outlet (1101) on the inclined guide surface is perpendicular to the inclined guide surface.

5. A symmetrical hot air nozzle as described in claim 1, characterized in that: The bottom surface of the inner cavity of the wing (11) is inclined to guide the airflow upward.

6. A symmetrical hot air nozzle as described in claim 1, characterized in that: The portion of the flow channel cavity (102) near the through hole (103) is slit-shaped.

7. A symmetrical hot air nozzle as described in claim 1, characterized in that: Both the nozzle body (1) and the nozzle core (2) are axisymmetric structures, wherein, The top of the nozzle core (2) is fixed to the top of the inner cavity of the nozzle body (1); The top surface of the nozzle body (1) is horizontally positioned; The sides of the nozzle body (1) and the nozzle core (2) are both inclined, and the inclination angles of the two are the same.

8. A symmetrical hot air nozzle as described in claim 7, characterized in that: The bottom surface of the nozzle core (2) is inclined to guide the airflow upward. The bottom and side surfaces of the nozzle core (2) are connected in an arc shape.

9. A symmetrical hot air nozzle as described in claim 1, characterized in that: The nozzle body (1), the nozzle core (2), and the wing (11) are an integral structure.

10. A symmetrical hot air nozzle as described in claim 1, characterized in that: The air inlet (101) has an internal thread on its wall.

Images