Finned tube with anti-corrosion core tube

Abstract

The utility model relates to a finned tube with an anti-corrosion core tube, the finned tube is an aluminum finned tube comprising a tube core 10 and fins 20, and the surface of the tube core is coated with an anti-corrosion layer 30. The aluminum finned tube has the advantages that the local anti-corrosion coating of the core tube is adopted, corrosion leakage of the aluminum finned tube is avoided, long-term safe operation of a refrigerating system and a refrigeration house system is guaranteed, and the finned tube keeps sufficient heat exchange capacity.

Description

Technical Field

[0001] This utility model relates to finned tube corrosion protection technology, and more particularly to a core tube corrosion-resistant finned tube. Background Technology

[0002] Aluminum finned tubes are commonly used as heat exchange materials in large cold storage facilities. Aluminum alloy finned tube profiles offer excellent thermal conductivity and processing performance. However, cold storage facilities typically experience high humidity, leading to frost or fogging on the surface of the aluminum finned tubes. Prolonged exposure to humid environments causes corrosion in aluminum alloys. Unlike the flaky corrosion of ordinary steel, aluminum alloy corrosion creates deeper micropores. While these micropores do not pose a serious threat to the fins themselves, they can cause refrigerant leaks in the core tube, contaminating the cold storage environment and potentially causing refrigeration system failure. In some cases (such as when the core tube operates under negative pressure), air can enter the core tube, mixing with the refrigerant and producing explosive gases, posing a significant risk and causing severe damage to the refrigeration system and even the entire cold storage system. Currently, finned tubes with assembled (set-together) structures can undergo anti-corrosion treatment, such as the "corrosion-resistant heat exchanger" disclosed in Chinese utility model patent (application number 2023225196129), where finned tubes and fins are assembled together, and an anti-corrosion coating is applied to the surface of the finned tubes. However, this technical solution cannot be applied to aluminum finned tubes with the core and fins integrally formed and arranged in parallel. Aluminum finned tubes with the core and fins integrally formed have better thermal conductivity. Currently, in large cold storage facilities, aluminum finned tubes with the core and fins integrally formed and arranged in parallel are widely used, forming multi-row aluminum tubes with S-shaped bends. Utility Model Content

[0003] The purpose of this invention is to provide a core tube anti-corrosion finned tube to prevent corrosion of the core tube of aluminum finned tubes.

[0004] To achieve the above objectives, the technical solution of this utility model is: a core tube anti-corrosion finned tube, wherein the finned tube is an aluminum finned tube including a core 10 and fins 20, and the surface of the core is coated with an anti-corrosion layer 30.

[0005] Furthermore, in order to achieve a complete anti-corrosion effect on the core tube, the coating area of ​​the anti-corrosion layer 30 includes the fin surface close to the core tube.

[0006] Furthermore, a preferred anti-corrosion coating area is that the coating area S of the anti-corrosion layer 20 is 1.5 times the outer diameter d of the core tube.

[0007] Furthermore, a suitable anti-corrosion material is that the anti-corrosion layer 20 is epoxy resin paint.

[0008] Furthermore, a suitable anti-corrosion material is that the anti-corrosion layer 20 is epoxy zinc yellow paint.

[0009] Furthermore, a suitable anti-corrosion material is that the anti-corrosion layer 20 is a powder coating layer.

[0010] Furthermore, a preferred finned tube structure is an aluminum finned tube in which the core 10 and the fins 20 are arranged in parallel.

[0011] Furthermore, a preferred finned tube structure is that the finned tube is an aluminum finned tube profile integrally formed from the core 10 and the fins 20.

[0012] The beneficial effects of this utility model are: by adopting a local anti-corrosion coating on the core tube, corrosion and leakage of aluminum finned tubes are avoided, ensuring the long-term safe operation of the refrigeration system and cold storage system, and maintaining sufficient heat exchange capacity of the finned tubes.

[0013] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention;

[0015] Figure 2 This is a side view of the present invention;

[0016] Figure 3 yes Figure 2 View from direction A;

[0017] Figure 4 This is a structural diagram of a multi-row aluminum pipe system. Detailed Implementation

[0018] Example 1:

[0019] like Figures 1 to 4 A type of corrosion-resistant finned tube with a core tube is disclosed. The finned tube is an aluminum finned tube comprising a core tube 10 and fins 20. The finned tube is an aluminum finned tube profile integrally formed from the core tube 10 and the fins 20, with the core tube 10 and fins 20 arranged parallel to each other. In this embodiment, the finned tube has two fins 20 symmetrical to the core tube 10. The finned tube can be fabricated into multi-row aluminum tubes with S-shaped bends (e.g.,...). Figure 4 As shown in the figure, it is typically used for refrigeration pipes in cold storage.

[0020] To protect the core tube 10 from corrosion, the surface of the core tube 10 is coated with an anti-corrosion layer 30. The coating area of ​​the anti-corrosion layer 30 also includes the fin surface near the core tube. In this embodiment, the coating area S of the anti-corrosion layer 20 is 1.5 times the outer diameter d of the core tube.

[0021] This invention provides corrosion protection for the core tube of aluminum finned tubes, preventing corrosion and leakage in humid environments.

[0022] Since various anti-corrosion coatings will more or less affect the thermal conductivity of aluminum finned tubes, this invention limits the anti-corrosion coating coverage area to the surface of the core tube 10 and a small portion of the fin surface near the core tube. Because the heat exchange function of the aluminum finned tube is mainly achieved through the fins 20, applying an anti-corrosion coating to the surface of the core tube 10 will not significantly reduce the thermal conductivity of the aluminum finned tube. To obtain a complete anti-corrosion effect for the core tube 10, the anti-corrosion area needs to be appropriately extended to the fin surface of the core tube. Based on practical experience, a coating area S of the anti-corrosion layer 20 that is 1.5 times the outer diameter d of the core tube is a more reasonable and preferred solution.

[0023] If the entire finned tube is coated with an anti-corrosion layer, an additional anti-corrosion film is added to the fin surface. This film has lower thermal conductivity than aluminum alloy, forming a thermal resistance layer and reducing heat exchange capacity. Therefore, coating the entire finned tube with an anti-corrosion layer is wasteful of paint and reduces heat exchange capacity, increasing the energy consumption of the refrigeration system. For every 1°C increase in the heat exchange temperature difference of the evaporator in a refrigeration system, the energy consumption of the refrigeration system increases by approximately 3.5%. According to engineering practice, the anti-corrosion coating can reduce the heat exchange temperature difference by 1°C to 2°C. Taking a 2°C reduction in the heat exchange temperature difference as an example, the refrigeration energy consumption increases by approximately 7%. Taking a finned tube as an example, its core tube outer diameter d=21mm, the tube width at both ends of the fins W=151mm, the core cross-sectional circumference is 66mm, and the overall cross-sectional circumference of the finned tube is (151-21)×2+66=326mm. The cross-sectional width S of the anti-corrosion coating area is 21 × 1.5 = 31.5 mm, and the cross-sectional perimeter of the anti-corrosion coating area is (31.5 - 21) × 2 + 66 = 87 mm. The cross-sectional perimeter of the anti-corrosion coating area is 27% of the overall cross-sectional perimeter of the finned tube, and the overall energy consumption impact of the finned tube is approximately 27% × 7% ≈ 1.9%. Engineering practice shows that aluminum finned tubes with this locally coated anti-corrosion material can fully meet the requirements of the refrigeration system. It saves on anti-corrosion materials and meets the energy-saving requirements of the refrigeration system.

[0024] This invention employs a localized anti-corrosion coating on the core tube to prevent corrosion and leakage of the aluminum finned tube, ensuring the long-term safe operation of the refrigeration system and cold storage system, and maintaining sufficient heat exchange capacity of the finned tube.

[0025] Example 2:

[0026] A core tube anti-corrosion finned tube, this embodiment is a special case of embodiment one.

[0027] In this embodiment, the anti-corrosion layer 20 is epoxy resin paint.

[0028] Example 3:

[0029] A core tube anti-corrosion finned tube, this embodiment is a special case of embodiment one.

[0030] In this embodiment, the anti-corrosion layer 20 is epoxy zinc yellow paint.

[0031] Example 4:

[0032] A core tube anti-corrosion finned tube, this embodiment is a special case of embodiment one.

[0033] In this embodiment, the anti-corrosion layer 20 is a powder coating layer.

Claims

1. A core-tube corrosion-resistant finned tube, wherein the finned tube is an aluminum finned tube comprising a core (10) and fins (20), characterized in that, The surface of the tube core is coated with an anti-corrosion layer (30). The coating area (S) of the anti-corrosion layer (30) is 1.5 times the outer diameter (d) of the core tube; The anti-corrosion layer (30) is epoxy resin paint, epoxy zinc yellow paint, or powder coating.

2. The core tube anti-corrosion finned tube according to claim 1, characterized in that, The finned tube is an aluminum finned tube in which the core (10) and fins (20) are arranged in parallel.

3. The core tube anti-corrosion finned tube according to claim 1, characterized in that, The finned tube is an aluminum finned tube profile integrally formed from the core (10) and the fins (20).

Images