Asymmetric hot air nozzle

Abstract

The utility model relates to the technical field of papermaking machinery, in particular to an asymmetric hot air nozzle which comprises a nozzle body and further comprises a nozzle core, and a first inclined blowing opening blowing towards the inclined upper portion of the right side is formed in the top of a left upper air chamber; the left side of the top of the right upper air chamber is provided with a straight blowing port blowing towards the right upper part, and the right side of the top is provided with a second inclined blowing port blowing towards the right inclined upper part; the nozzle core is fixed in the lower air chamber, a first air channel for conveying hot air flow to the left upper air chamber is formed in the left side of the air chamber, and a second air channel for conveying hot air flow to the right upper air chamber is formed in the right side of the air chamber; the first air channel is of a narrow pipe structure. According to the asymmetric hot air nozzle, the hot air distribution strategy that the center serves as a main part and the edge serves as an auxiliary part is achieved through a straight blowing structure and an inclined blowing structure, the overall drying uniformity and efficiency are improved, and the problem that a traditional nozzle is uneven in paper drying is solved.

Description

Technical Field

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

[0002] In the papermaking machinery industry, paper drying is one of the key processes affecting product quality and production efficiency. With the continuous development of modern high-speed paper machines, hot air impact drying technology has been widely used in the drying section of paper machines due to its advantages such as high heat transfer efficiency and fast drying rate. Among them, the hot air nozzle is the core component of the system, and its structural design directly affects the uniformity of hot air distribution, energy utilization efficiency, and paper quality.

[0003] Currently, most mainstream hot air nozzles adopt a symmetrical structural design. For example, Chinese utility model patent with authorization announcement number CN202519527U discloses a double-slit hot air nozzle, which delivers hot air to the surface of the paper web through symmetrical air outlets on the left and right sides.

[0004] As described above, in practical applications, due to the symmetrical airflow distribution, the central area of ​​the paper web is subjected to the superposition of airflow from multiple directions, resulting in a higher temperature. However, the edge area suffers from insufficient heat due to airflow diffusion, leading to uneven distribution of moisture content in the paper web and causing quality problems such as curling and frilly edges. Utility Model Content

[0005] In view of this, this utility model proposes an asymmetric hot air nozzle, which achieves a "center-centric, edge-supplemented" hot air distribution strategy through an asymmetric direct and oblique blowing structure, thereby improving the overall drying uniformity and efficiency and solving the problem of uneven paper drying caused by traditional nozzles.

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

[0007] This utility model provides an asymmetric hot air nozzle, including a nozzle body and a nozzle core. The nozzle body contains, from bottom to top, a lower air chamber, an upper left air chamber, and an upper right air chamber that are isolated from each other.

[0008] The top of the upper left air chamber is provided with a first oblique blowing port that blows air upwards and to the right.

[0009] The upper right air chamber has a straight nozzle on the left side of the top, blowing air directly upwards, and a second oblique nozzle on the right side, blowing air diagonally upwards to the right.

[0010] The nozzle core is fixed in the lower air chamber, and a first air passage for delivering hot air flow to the upper left air chamber is formed on the left side of the lower air chamber, and a second air passage for delivering hot air flow to the upper right air chamber is formed on the right side.

[0011] The first airway is a narrow tube structure.

[0012] Based on the above technical solutions, preferably, the upper left air chamber is connected to the first air passage through a first through hole.

[0013] Based on the above technical solutions, preferably, the upper right air chamber is connected to the second air passage through a second through hole.

[0014] Based on the above technical solutions, preferably, the width of the first airway is 2-5mm.

[0015] Based on the above technical solutions, preferably, the width of the second airway is at least twice the width of the first airway.

[0016] Based on the above technical solutions, preferably, the first oblique blowing port is a slit-shaped air outlet.

[0017] Based on the above technical solutions, preferably, the diameter of the first oblique blowhole gradually decreases along the air outlet direction.

[0018] Based on the above technical solution, preferably, the top of the nozzle body, corresponding to the second oblique blowing port, is inclined downward to form a guide slope, wherein,

[0019] The central axis of the second inclined nozzle is set perpendicular to the guide inclined surface.

[0020] Based on the above technical solutions, preferably, the nozzle body has an air inlet at its bottom, wherein...

[0021] The air inlet is connected to the lower air chamber.

[0022] Based on the above technical solutions, preferably, the nozzle body has a mounting base fixed at its bottom.

[0023] The asymmetric hot air nozzle of this invention has the following advantages over the prior art:

[0024] (1) The hot airflow entering the bottom of the nozzle body is divided into two paths by the nozzle core: one path is accelerated through the first air passage of the narrow tube structure and enters the upper left air chamber, and is directionally sprayed to the edge area of ​​one side of the paper web through the first oblique nozzle to achieve efficient edge heating; the other path enters the upper right air chamber through the second air passage with a larger cross section, and is vertically impacted to the center area of ​​the paper web through the straight nozzle and sprayed to the other side edge of the paper web through the second oblique nozzle. With this asymmetrical straight and oblique blowing structure, a hot air distribution strategy of "center as the main and edge as the auxiliary" is realized. While ensuring that the center area of ​​the paper web is fully dried, the heat of the two edge areas is also taken into account, so as to achieve uniform and efficient hot air drying across the entire width, significantly improving drying uniformity, heat energy utilization rate and paper quality.

[0025] (2) By setting the guide slope, hot air is directed to the edge of the paper web, which enhances the effective coverage area of ​​the main airflow on the paper web and makes the heat replenishment effect of the edge area better. It is especially suitable for stable drying operations in high-speed paper machine environments.

[0026] (3) By setting the first oblique blow nozzle as a slit-shaped air outlet and adopting a tapered nozzle structure that gradually decreases in diameter along the air outlet direction, the outlet velocity and concentration of the hot airflow are effectively improved. This not only enhances the penetration and heating intensity of the airflow into the edge area of ​​the paper web, but also significantly reduces the diffusion loss of the airflow during the jetting process, thereby improving the thermal energy utilization rate of the edge area. At the same time, the tapered nozzle structure helps to form a more stable and high-speed directional airflow, avoiding uneven heating caused by airflow turbulence or pressure attenuation, thus achieving efficient and uniform drying of the paper edge area. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the internal structure of an asymmetric hot air nozzle according to the present invention;

[0029] Figure 2 This is a schematic diagram of the airflow direction of an asymmetric hot air nozzle according to the present invention;

[0030] In the diagram: 1. Nozzle body; 2. Nozzle core; 11. Mounting base; 101. Lower air chamber; 102. Upper left air chamber; 103. Upper right air chamber; 104. First through hole; 105. Second through hole; 1011. First air passage; 1012. Second air passage; 1013. Air inlet; 1021. First oblique blow port; 1031. Straight blow port; 1032. Second oblique blow port. Detailed Implementation

[0031] 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.

[0032] like Figure 1-2 As shown, an asymmetric hot air nozzle of this utility model includes a nozzle body 1 and a nozzle core 2. The nozzle body 1 has a lower air chamber 101, a left upper air chamber 102 and a right upper air chamber 103 arranged sequentially from bottom to top, which are isolated from each other.

[0033] The upper left air chamber 102 has a first oblique blowing port 1021 at its top, blowing air upwards and to the right. The upper right air chamber 103 has a straight blowing port 1031 at its top left, blowing air directly upwards, and a second oblique blowing port 1032 at its top right, blowing air upwards and to the right. The nozzle core 2 is fixed inside the lower air chamber 101, forming a first air passage 1011 on the left side of the lower air chamber 101 for delivering hot air to the upper left air chamber 102, and a second air passage 1012 on the right side for delivering hot air to the upper right air chamber 103. The first air passage 1011 is a narrow tube structure.

[0034] In this structure, a mounting base 11 is fixed to the bottom of the nozzle body 1. The base has bolt mounting holes for fixing the nozzle to the hot air duct. The bottom of the nozzle body 1 has an air inlet 1013 that communicates with the lower air chamber 101 for introducing hot air flow.

[0035] The hot airflow is split into two streams within the lower air chamber 101 through the nozzle core 2: one stream is accelerated through the first air passage 1011 with a narrow tube structure and enters the upper left air chamber 102, and is then directionally sprayed to one edge area of ​​the paper web through the first oblique nozzle 1021 to achieve efficient edge heating. The other stream enters the upper right air chamber 103 through the second air passage 1012 with a larger cross-section, and is then vertically impacted in the center area of ​​the paper web through the straight nozzle 1031 and sprayed towards the other edge of the paper web through the second oblique nozzle 1032.

[0036] By employing the aforementioned two asymmetrical direct and oblique blowing structures, a "center-centric, edge-supplemented" hot air distribution strategy is achieved. This ensures that the central area of ​​the paper web is fully dried while also supplementing the heat to the two edge areas, thereby achieving uniform and efficient hot air drying across the entire width of the paper web. This significantly improves drying uniformity, heat energy utilization, and the quality of the finished paper product.

[0037] In the above-mentioned asymmetrical hot air nozzle structure, the upper left air chamber 102 and the upper right air chamber 103 are arranged side by side above the lower air chamber 101. The upper right air chamber 103 extends to the right to form a brim shape, thereby increasing the internal space of the upper right air chamber 103. This expands the arrangement area of ​​the straight blowing port 1031 and the second oblique blowing port 1032, making it easier to increase the number of air outlets, improve the hot air coverage density of the paper web center and edge areas, and further enhance drying efficiency and uniformity.

[0038] Furthermore, the upper left air chamber 102 is connected to the first air passage 1011 via a first through hole 104, which is located on the partition wall between the upper left air chamber 102 and the first air passage 1011. The upper right air chamber 103 is connected to the second air passage 1012 via a second through hole 105, which is also located on the partition wall between the upper right air chamber 103 and the second air passage 1012. This structural design facilitates efficient communication between the upper and lower airflow channels, ensuring stable delivery of hot air along a predetermined path and improving the overall drying efficiency and airflow control accuracy of the nozzle.

[0039] Meanwhile, the width of the first air passage 1011 is 2-5mm, thereby realizing the slit structure of the first air passage 1011, which can effectively generate high-speed fine airflow, suitable for fine heating of the paper edge area, avoiding paper deformation or wrinkling due to excessive airflow, and improving the hot air utilization rate of the edge area.

[0040] In addition, the first oblique nozzle 1021 is a slit-shaped air outlet, and the diameter of the first oblique nozzle 1021 gradually decreases along the air outlet direction. This structure makes the outlet diameter gradually decrease along the air outlet direction, which helps to accelerate the airflow speed, improve the jet efficiency, and enhance the directionality and concentration of the airflow, thereby achieving a more precise hot air delivery effect.

[0041] In the aforementioned asymmetric hot air nozzle structure, the width of the second air passage 1012 is at least twice the width of the first air passage 1011. When the width of the first air passage 1011 is 2 mm, the width of the second air passage 1012 is 5 mm. This allows the second air passage 1012 to form a low-speed but high-flow-rate main airflow channel, suitable for concentrated heating of the central area of ​​the paper.

[0042] The nozzle body 1 has a downward-sloping guide slope at its top, corresponding to the second inclined nozzle 1032. The central axis of the second inclined nozzle 1032 is perpendicular to the guide slope. This guide slope effectively directs the main airflow towards the edge area of ​​the paper web, enhancing the effective coverage area of ​​the main airflow on the paper web and improving the heat replenishment effect in the edge area. This makes the nozzle suitable for stable drying operations in high-speed paper machine environments.

[0043] The method of using the asymmetric hot air nozzle of this utility model is as follows:

[0044] First, install and fix the nozzle to the hot air duct through the bottom air inlet 1013, and adjust its position so that it is below the paper web, ensuring that each air outlet is aligned with the corresponding area of ​​the paper web.

[0045] At work, such as Figure 2 As shown in the diagram, the arrows indicate the airflow direction. Hot air enters the lower air chamber 101 through the air inlet 1013 and is divided into two streams by the nozzle core 2: one stream enters the first air passage 1011 on the left, which has a narrow tube structure, accelerating the airflow before it enters the upper left air chamber 102. It is then directionally sprayed through the first oblique nozzle 1021 to one edge area of ​​the paper web, achieving efficient edge heating. The other stream enters the second air passage 1012 on the right. This passage has a wider cross-section and is used to deliver a larger flow rate of low-speed air into the upper right air chamber 103. Subsequently, it vertically impacts the center area of ​​the paper web through the straight nozzle 1031 and is concentratedly sprayed towards the other edge of the paper web through the second oblique nozzle 1032.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An asymmetric hot air nozzle, comprising a nozzle body (1), characterized in that: It also includes a nozzle core (2), and the nozzle body (1) has, from bottom to top, a lower air chamber (101), a left upper air chamber (102), and a right upper air chamber (103) that are isolated from each other, wherein, The top of the upper left air chamber (102) is provided with a first oblique blowing port (1021) that blows air upwards and to the right. The upper right air chamber (103) has a straight blowing port (1031) on the left side of the top, blowing air directly upwards, and a second oblique blowing port (1032) on the right side, blowing air obliquely upwards to the right. The nozzle core (2) is fixed in the lower air chamber (101), and a first air passage (1011) for delivering hot air to the upper left air chamber (102) is formed on the left side of the lower air chamber (101), and a second air passage (1012) for delivering hot air to the upper right air chamber (103) is formed on the right side. The first airway (1011) is a narrow tube structure.

2. The asymmetric hot air nozzle as described in claim 1, characterized in that: The upper left air chamber (102) is connected to the first airway (1011) through the first through hole (104).

3. An asymmetric hot air nozzle as described in claim 1, characterized in that: The upper right air chamber (103) is connected to the second air passage (1012) through the second through hole (105).

4. An asymmetric hot air nozzle as described in claim 1, characterized in that: The width of the first airway (1011) is 2-5 mm.

5. An asymmetric hot air nozzle as described in claim 4, characterized in that: The width of the second airway (1012) is at least twice the width of the first airway (1011).

6. An asymmetric hot air nozzle as described in claim 1, characterized in that: The first oblique blowout (1021) is a slit-shaped air outlet.

7. An asymmetric hot air nozzle as described in claim 6, characterized in that: The diameter of the first oblique blowhole (1021) gradually decreases along the air outlet direction.

8. An asymmetric hot air nozzle as described in claim 1, characterized in that: The top of the nozzle body (1) and the portion corresponding to the second oblique nozzle (1032) slopes downward to form a guide slope, wherein, The central axis of the second inclined nozzle (1032) is set perpendicular to the guide inclined surface.

9. An asymmetric hot air nozzle as described in claim 1, characterized in that: The nozzle body (1) is provided with an air inlet (1013) at its bottom, wherein, The air inlet (1013) is connected to the lower air chamber (101).

10. An asymmetric hot air nozzle as described in claim 9, characterized in that: The nozzle body (1) is fixed with a mounting base (11) at the bottom.

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