Composite spray tube

Abstract

The application provides a composite spraying pipe, comprising a liquid inlet pipe piece, a composite pipe piece and a nozzle piece, the composite pipe piece comprises a spraying outer pipe, a CFRP inner liner and a spraying pipe, the liquid inlet pipe piece, the spraying outer pipe and the nozzle piece are sequentially connected in the axial direction, the CFRP inner liner is attached to the inner surface of the spraying outer pipe, a spraying channel is arranged in the CFRP inner liner, the spraying pipe is arranged in the spraying channel, and the two ends of the spraying pipe are communicated with the liquid inlet pipe piece and the nozzle piece respectively. Through the arrangement of the CFRP inner liner, the bending resistance is improved due to the high specific stiffness characteristic, the density of the CFRP is far lower than that of the metal, the overall weight is greatly reduced, compared with the traditional all-metal pipe, the composite structure of the application is mechanically optimized, the reduction of the dead load and the improvement of the material stiffness will jointly lead to the reduction of the bending deformation, the downward bending deformation and the drooping caused by the gravity can be effectively inhibited, the collision with the inner wall of the mold can be avoided, and the safety and the product quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal casting technology, specifically to a composite spraying pipe. Background Technology

[0002] Centrifugal casting is an advanced casting process, particularly suitable for producing long, tubular castings. This process involves rotating a mold at high speed, using centrifugal force to evenly spread molten metal onto the inner wall of the mold to form the casting. During this process, a spraying tube, a long pipe extending into the mold, serves the crucial function of evenly spraying a special coating or heat-insulating slurry onto the preheated inner surface of the mold before casting. This forms an insulating layer, ensuring smooth demolding of the casting and improving its surface quality.

[0003] Currently, in the centrifugal casting of long tubular castings, to meet process requirements, the coating tube needs to extend horizontally for a long distance into the high-speed rotating mold in the form of a cantilever beam. However, most existing coating tubes are made of a single metal material. Under long-tube conditions, existing coating tubes often lack sufficient overall structural rigidity and cannot effectively resist bending deformation caused by their own weight. Therefore, when the coating tube extends beyond a certain length, it will bend and sag downwards due to gravity. This makes it impossible for the coating tube to stay on the center line of the mold, especially when the end of the coating tube is too low. This reduces the safety clearance between the end of the coating tube and the inner wall of the mold, making it very easy for the end of the coating tube to scrape or collide with the inner wall of the mold. This will only scratch the coating on the inner wall of the mold, causing surface defects in the casting. In severe cases, it will damage the coating tube or the mold, directly threatening production safety and product quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a composite spraying pipe.

[0005] The composite spraying pipe disclosed in this application includes: a liquid inlet pipe fitting, a composite pipe fitting, and a nozzle fitting. The composite pipe fitting includes a spraying outer pipe, a CFRP inner liner, and a spraying pipe. The liquid inlet pipe fitting, the spraying outer pipe, and the nozzle fitting are connected sequentially along the axial direction. The CFRP inner liner is attached to the inner surface of the spraying outer pipe. A spraying channel is opened in the CFRP inner liner. The spraying pipe is located in the spraying channel, and both ends of the spraying pipe are connected to the liquid inlet pipe fitting and the nozzle fitting, respectively.

[0006] Preferably, the outer spray tube is made of stainless steel.

[0007] Preferably, the ratio of the wall thickness of the outer tube to the wall thickness of the CFRP inner liner is 2:3.

[0008] Preferably, the wall thickness of the outer tube is 2mm and the wall thickness of the CFRP inner liner is 3mm.

[0009] Preferably, the outer diameter of the spraying tube is 30mm and the inner diameter of the spraying channel is 20mm.

[0010] Preferably, the CFRP inner liner is laminated and fixed to the inner wall of the sprayed outer tube.

[0011] Preferably, the CFRP liner is adhered and fixed to the inner wall of the sprayed outer tube.

[0012] Preferably, the composite spraying pipe also includes a valve body, which is connected to the liquid inlet pipe.

[0013] Preferably, the composite spraying pipe further includes a liquid supply component and an air supply component. The valve body component has a connecting interface, a liquid inlet interface, and an air inlet interface. The connecting interface is connected to the liquid inlet pipe component, the liquid supply component is connected to the liquid inlet interface, and the air supply component is connected to the air inlet interface.

[0014] Preferably, the nozzle assembly includes a nozzle and a nozzle mounting base. The nozzle mounting base is connected to the end of the spraying outer pipe away from the liquid inlet pipe assembly. The nozzle is located on the nozzle mounting base, and one end of the spraying pipe is located on the nozzle mounting base, with one end of the spraying pipe communicating with the nozzle.

[0015] The beneficial effects of this application are as follows: The composite spraying pipe of this application is applied to the centrifugal casting of long tubular castings. The mold to be sprayed rotates at high speed, and the composite spraying pipe extends axially into the internal cavity of the mold from the end of the mold. The spraying liquid enters through the liquid inlet pipe, flows through the spraying pipe, and is finally atomized and evenly sprayed onto the inner wall of the mold by the nozzle at the end to form a high-quality casting isolation coating. Since the composite pipe fitting includes a sprayed outer pipe and a CFRP inner liner, the sprayed outer pipe provides a wear-resistant protective layer and external structural support, effectively resisting possible scratches with the inner wall of the mold. The CFRP inner liner, due to its high specific stiffness, further enhances the bending resistance. Furthermore, since CFRP has a density much lower than that of metal, it significantly reduces the overall weight of the pipe. Compared with traditional all-metal pipes, the composite structure of the composite pipe fitting in this application achieves synergistic optimization in mechanics. The reduction of self-weight load and the increase of material stiffness will jointly lead to a significant reduction in bending deformation. During long-distance cantilever operations, it can effectively suppress downward bending deformation and sagging caused by gravity, avoid collisions between the composite sprayed pipe and the inner wall of the mold, and improve safety and product quality. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a cross-sectional view of the composite spray pipe in the embodiment.

[0017] Figure label: 1. Liquid inlet pipe fitting; 11. Liquid inlet channel; 2. Composite pipe fitting; 21. Spraying outer pipe; 22. CFRP inner lining; 221. Spraying channel; 23. Spraying pipe; 3. Nozzle fitting; 31. Nozzle; 32. Nozzle mounting base. Detailed Implementation

[0018] The following drawings disclose several embodiments of this application. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this application. That is, in some embodiments of this application, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0021] To further understand the content, features, and effects of this application, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0022] Reference Figure 1 , Figure 1 The figure shows a cross-sectional view of the composite spraying pipe in this embodiment. The composite spraying pipe in this embodiment includes an inlet pipe component 1, a composite pipe component 2, and a nozzle component 3. The composite pipe component 2 includes an outer spraying pipe 21, a CFRP inner liner 22, and a spraying pipe 23. The inlet pipe component 1, the outer spraying pipe 21, and the nozzle component 3 are connected sequentially along the axial direction. The CFRP inner liner 22 is attached to the inner surface of the outer spraying pipe 21. A spraying channel 221 is opened in the CFRP inner liner 22. The spraying pipe 23 is located in the spraying channel 221, and both ends of the spraying pipe 23 are connected to the inlet pipe component 1 and the nozzle component 3, respectively.

[0023] In this embodiment, the composite spraying pipe is used for centrifugal casting of long tubular castings. The mold to be sprayed rotates at high speed, and the composite spraying pipe extends axially into the internal cavity of the mold from the end of the mold. The spraying liquid enters through the liquid inlet pipe 1, flows through the spraying pipe 23, and is finally atomized and evenly sprayed onto the inner wall of the mold by the nozzle 3 at the end to form a high-quality casting isolation coating. Since the composite pipe component 2 includes a sprayed outer pipe 21 and a CFRP inner liner 22, the sprayed outer pipe 21 provides a wear-resistant protective layer and external structural support, effectively resisting possible scratches with the inner wall of the mold. The CFRP inner liner 22, due to its high specific stiffness, enhances bending resistance. Furthermore, because CFRP has a much lower density than metal, it significantly reduces the overall weight of the pipe. Compared to traditional all-metal pipes, the composite structure of the composite pipe component 2 in this embodiment achieves synergistic optimization in mechanics. The reduction in self-weight load and the increase in material stiffness together lead to a significant reduction in bending deformation. During long-distance cantilever operations, it can effectively suppress downward bending deformation and sagging caused by gravity, preventing the composite sprayed pipe from colliding with the inner wall of the mold, thus improving safety and product quality. Specifically, in this embodiment, the axial direction refers to the line connecting the liquid inlet pipe component 1 to the nozzle component 3.

[0024] Preferably, the outer spray tube 21 is made of stainless steel. In specific applications, the composite pipe component 2 in this embodiment is a double-layer composite pipe, with the outer layer being the spray tube 21, which provides wear resistance and corrosion resistance, and also serves as a mechanical connection to the liquid inlet pipe component 1 and the nozzle component 3. The inner layer of the spray tube 21 is a CFRP liner 22. Since CFRP has a much lower density than metal, it can significantly reduce the overall weight of the pipe. At the same time, due to its high specific stiffness, it can further improve the overall rigidity and bending resistance of the composite pipe component 2. Compared with traditional all-metal spray tubes, the spray tube 21 ensures surface hardness, wear resistance, and overall structural stability, while also protecting the inner CFRP liner 22. The CFRP liner 22 not only effectively improves the overall rigidity of the composite pipe component 2, but also reduces the overall weight of the composite pipe component 2, weakening downward bending deformation and sagging caused by gravity, preventing the composite spray tube from colliding with the inner wall of the mold, and improving safety and product quality. Specifically, the outer spraying tube 21 is made of SUS304 stainless steel, with a Young's modulus E = 193 GPa and a density ρ = 7.93 g / cm³. The CFRP liner 22 is made of CFRP material, with an E = 230 GPa and a ρ = 1.6 g / cm³. The above materials are all existing technologies and will not be described in detail here.

[0025] Preferably, the ratio of the wall thickness of the coated outer tube 21 to the wall thickness of the CFRP inner liner 22 is 2:3. In practical applications, while ensuring a fixed total wall thickness of the composite pipe component 2, a thicker CFRP inner liner 22 can effectively increase the overall cross-sectional moment of inertia of the pipe body, i.e., its bending resistance, while maximizing the control of the pipe body's weight increase. Specifically, this proportional design makes the more rigid CFRP inner liner 22 the main load-bearing element to resist bending deformation, while the relatively thinner stainless steel coated outer tube 21 can achieve protection, wear resistance, and connection strength. Specifically, in this embodiment, the wall thickness of the coated outer tube 21 is 2mm, and the wall thickness of the CFRP inner liner 22 is 3mm. It can be understood that the traditional coated pipe has a wall thickness of 4mm and is made of pure stainless steel. In this embodiment, the total thickness of the composite pipe component 2 is increased from 4mm to 5mm. Under the premise of a total thickness increase of 1mm, a synergistic optimization effect of 34% weight reduction and 38% deflection reduction is achieved. Furthermore, the outer diameter of the spraying outer tube 21 is 30mm, the inner diameter of the spraying channel 221 is 20mm, and the length of the composite pipe component 2 is 3000mm. Thus, the weight of the composite spraying pipe in this embodiment is 3.2KG, which is 34% lighter than the existing pure stainless steel spraying pipe. At the same time, the deflection δ=13.5mm under static load in this embodiment is 38% lower than the deflection of the existing pure stainless steel spraying pipe. It can adapt to molds with smaller diameters (>Φ60mm) and longer lengths, thus broadening the application scenarios.

[0026] Preferably, the CFRP liner 22 is laminated and fixed to the inner wall of the spraying outer tube 21. In specific applications, the CFRP liner 22 being laminated and fixed to the inner wall of the spraying outer tube 21 ensures that the composite spraying tube deforms as a whole under stress, greatly improving the overall bending stiffness of the composite spraying tube. Simultaneously, this structure places the high-stiffness, low-density CFRP liner 22 on the inner wall of the spraying outer tube 21, while the outer spraying outer tube 21 provides wear-resistant protection. This not only effectively increases the moment of inertia of the section to achieve bending resistance, but also achieves the goals of high rigidity and lightweight without significantly increasing the wall thickness, effectively suppressing sagging deformation during long tube operations. Specifically, the spraying channel 221 is a through channel inside the CFRP liner 22, and the spraying tube 23 is disposed within the spraying channel 221. Of course, in other embodiments, the CFRP liner 22 is adhered and fixed to the inner wall of the spraying outer tube 21, which will not be elaborated here.

[0027] Preferably, the composite spraying pipe also includes a valve body, which is connected to the liquid inlet pipe 1. By providing the valve body, when spraying is required, the valve body can be opened, allowing the spraying liquid to enter through the liquid inlet pipe 1, flow through the valve body into the spraying pipe 23, and finally be atomized and evenly sprayed onto the inner wall of the mold by the nozzle 3 at the end. When spraying is not required, the valve body can simply be closed. Furthermore, the composite spraying pipe also includes a liquid supply component and an air supply component. The valve body has a connecting interface, a liquid inlet interface, and an air inlet interface. The connecting interface is connected to the liquid inlet pipe 1, the liquid supply component is connected to the liquid inlet interface, and the air supply component is connected to the air inlet interface. It can be understood that in this embodiment, the valve body is a three-way valve, the liquid supply component is a spraying liquid supply pipe, and the air supply component is an air storage tank. After the spraying process is completed, the valve is switched to switch the spray liquid supply line to the compressed air source, and the spray pipe 23 is used for purging, thereby cleaning the nozzle component 3 and preventing residual spray liquid from drying and clogging at the nozzle component 3. At the same time, compared with the traditional spray pipe, the independent air blowing pipe structure is eliminated, further reducing weight and effectively suppressing downward bending deformation and sagging caused by gravity. Specifically, the nozzle component 3 includes a nozzle 31 and a nozzle mounting base 32. The nozzle mounting base 32 is connected to the end of the spray outer pipe 21 away from the liquid inlet pipe component 1. The nozzle 31 is located on the nozzle mounting base 32, and one end of the spray pipe 23 is located on the nozzle mounting base 32, and one end of the spray pipe 23 is connected to the nozzle 31. The liquid inlet pipe fitting 1 is a liquid inlet pipe connector. The liquid inlet pipe connector is connected to the end of the spraying outer pipe 21 away from the nozzle fitting 3. The other end of the spraying pipe 23 is located at the liquid inlet pipe fitting 1. The liquid inlet pipe fitting 1 has a liquid inlet channel 11, which is connected to the other end of the spraying pipe 23 and the connecting interface.

[0028] In summary, the composite spraying pipe in this embodiment is used for centrifugal casting of long tubular castings. The mold to be sprayed rotates at high speed, and the composite spraying pipe extends axially into the internal cavity of the mold from the end of the mold. The spraying liquid enters through the liquid inlet pipe 1, flows through the spraying pipe 23, and is finally atomized and evenly sprayed onto the inner wall of the mold by the nozzle 3 at the end to form a high-quality casting isolation coating. Since the composite pipe component 2 includes a sprayed outer pipe 21 and a CFRP inner liner 22, the sprayed outer pipe 21 provides a wear-resistant protective layer and external structural support, effectively resisting possible scratches with the inner wall of the mold. The CFRP inner liner 22, due to its high specific stiffness, further enhances the bending resistance. Furthermore, since CFRP has a much lower density than metal, it significantly reduces the overall weight of the pipe. Compared with traditional all-metal pipes, the composite structure of the composite pipe component 2 in this embodiment achieves synergistic optimization in mechanics. The reduction of self-weight load and the increase of material stiffness will jointly lead to a significant reduction in bending deformation. During long-distance cantilever operations, it can effectively suppress downward bending deformation and sagging caused by gravity, avoid collisions between the composite sprayed pipe and the inner wall of the mold, and improve safety and product quality.

[0029] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A composite spray tube, characterized by, include: The liquid inlet pipe (1), the composite pipe (2), and the nozzle (3) are provided. The composite pipe (2) includes a spraying outer pipe (21), a CFRP inner liner (22), and a spraying pipe (23). The liquid inlet pipe (1), the spraying outer pipe (21), and the nozzle (3) are connected in sequence along the axial direction. The CFRP inner liner (22) is attached to the inner surface of the spraying outer pipe (21). A spraying channel (221) is provided in the CFRP inner liner (22). The spraying pipe (23) is located in the spraying channel (221), and both ends of the spraying pipe (23) are connected to the liquid inlet pipe (1) and the nozzle (3), respectively.

2. The composite spray tube of claim 1, wherein, The spraying outer tube (21) is made of stainless steel.

3. The composite spray tip of claim 1, wherein, The ratio of the wall thickness of the sprayed outer tube (21) to the wall thickness of the CFRP inner liner (22) is 2:

3.

4. The composite spray tip of claim 3, wherein, The wall thickness of the sprayed outer tube (21) is 2 mm, and the wall thickness of the CFRP inner liner (22) is 3 mm.

5. The composite spray tip of claim 4, wherein, The outer diameter of the spraying outer tube (21) is 30 mm, and the inner diameter of the spraying channel (221) is 20 mm.

6. The composite spray tip of claim 1, wherein, The CFRP liner (22) is laminated and fixed to the inner wall of the sprayed outer tube (21).

7. The composite spray tip of claim 1, wherein The CFRP liner (22) is adhered and fixed to the inner wall of the sprayed outer tube (21).

8. The composite spray tip of claim 1, wherein, It also includes a valve body component, which is connected to the liquid inlet pipe component (1).

9. The composite spraying pipe according to claim 8, characterized in that, It also includes a liquid supply component and a gas supply component. The valve body component has a communication interface, a liquid inlet interface and a gas inlet interface. The communication interface is connected to the liquid inlet pipe component (1). The liquid supply component is connected to the liquid inlet interface. The gas supply component is connected to the gas inlet interface.

10. The composite spraying pipe according to claim 1, characterized in that, The nozzle component (3) includes a nozzle (31) and a nozzle mounting base (32). The nozzle mounting base (32) is connected to the end of the spraying outer tube (21) away from the liquid inlet pipe component (1). The nozzle (31) is located on the nozzle mounting base (32). One end of the spraying tube (23) is located on the nozzle mounting base (32), and one end of the spraying tube (23) is connected to the nozzle (31).

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