Corrosion-resistant bent short pipe for automobile air conditioner

Abstract

The utility model relates to the technical field of automobile air conditioners, and solves the problems that a short pipe is corroded, the strength is reduced and the service life is shortened due to the fact that the short pipe is influenced by external environmental factors. The corrosion-resistant bent short pipe for the automobile air conditioner comprises a corrugated aluminum alloy base pipe, the outer surface of the corrugated aluminum alloy base pipe is sequentially coated with an anodic oxidation layer and a fluorocarbon resin coating, flaring type connecting parts are arranged at the two ends of the corrugated aluminum alloy base pipe, and rubber sealing rings are embedded in the flaring type connecting parts. The corrugation period of the corrugated aluminum alloy base pipe is 8-12 mm, the wave crest height is 1.5-2.5 mm, the fluorocarbon resin coating comprises nano silicon dioxide particles with the mass fraction being 3-5%, and the thickness of the coating is 80-120 micrometers.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning technology, specifically to a corrosion-resistant bent short pipe for automotive air conditioning. Background Technology

[0002] The coaxial tube for automotive air conditioning disclosed in CN219300122U includes an outer tube, an inner tube, two connectors, and two external connecting pipes. The outer wall of the outer tube has a first thread near both ends. The outer diameter of the inner tube is smaller than the inner diameter of the outer tube. The two ends of the inner tube extend beyond the two ends of the outer tube. The outer wall of the inner tube has a second thread near both ends. Both connectors are cylindrical. One end of the connector has a connecting plate with a through hole. The side wall of the through hole has a third thread. The inner tube is screwed into the through hole, and the outer tube is screwed into the connector. The external connecting pipes are connected to the outer tube.

[0003] It has a first thread on the outer wall of the outer tube, a second thread on the outer wall of the inner tube, and a third and fourth thread on the connector, so that the connector can be screwed onto the inner and outer tubes. When the coaxial tube is damaged, only the damaged part needs to be replaced, which greatly reduces the maintenance cost of the coaxial tube.

[0004] However, the short pipe is affected by external environmental factors, which causes corrosion, reduces its strength, and shortens its service life. Therefore, this solution does not provide high strength for the short pipe. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a corrosion-resistant bending short pipe for automotive air conditioning, which solves the problem that the short pipe is affected by external environmental factors, leading to corrosion, reduced strength, and shortened service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant bending short pipe for automotive air conditioning, comprising a corrugated aluminum alloy base pipe, wherein the outer surface of the corrugated aluminum alloy base pipe is sequentially coated with an anodized layer and a fluorocarbon resin coating, and both ends of the corrugated aluminum alloy base pipe are provided with flared connecting parts, wherein a rubber sealing ring is embedded inside the flared connecting parts, and the corrugation period of the corrugated aluminum alloy base pipe is 8-12mm, and the corrugation peak height is 1.5-2.5mm.

[0007] In one specific embodiment, the fluorocarbon resin coating comprises 3-5% by mass of nano-silica particles, and the coating thickness is 80-120 μm.

[0008] In one specific embodiment, the bending curvature of the corrugated aluminum alloy base tube is matched with the layout of the automotive air conditioning pipeline, and the bending radius tolerance is controlled within ±0.5D (D is the nominal diameter of the base tube).

[0009] In one specific embodiment, the inner wall of the base tube is provided with a zinc-nickel alloy plating layer with a thickness of 0.1-0.3 mm.

[0010] In one specific embodiment, 0.5-1.2% by mass of cerium oxide corrosion inhibitor is added to the interior of the fluorocarbon resin coating.

[0011] In one specific embodiment, the flared connector adopts a 30° conical surface structure, and its outer surface is provided with anti-slip threads.

[0012] Compared with the prior art, this utility model provides a corrosion-resistant bending short pipe for automotive air conditioning, which has the following beneficial effects:

[0013] The technical solution disclosed in this utility model utilizes a corrugated aluminum alloy base tube design to improve flexibility while maintaining airflow. Optimized crest parameters enhance vibration fatigue resistance. The double-coating structure increases salt spray resistance time, extending the lifespan compared to traditional galvanized steel pipes. The flared connection, combined with an embedded rubber sealing ring, ensures airtightness even with reduced installation torque. The nano-silica-reinforced fluorocarbon resin coating achieves a surface hardness of 4H, improving scratch resistance and effectively resisting gravel impacts under complex automotive chassis conditions. The zinc-nickel alloy plating reduces corrosion current density to 0.12 μA / cm² in condensate environments. 2 Together with the external coating, it forms a double anti-corrosion barrier. The introduction of cerium oxide corrosion inhibitor enhances the coating's self-healing ability, and it can still maintain a corrosion protection efficiency of >85% even at a high temperature of 120℃. Attached Figure Description

[0014] 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:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the corrugated aluminum alloy base tube structure of this utility model;

[0017] Figure 3 This utility model Figure 2 Enlarged view of the structure at point A in the middle;

[0018] Figure 4 This is a schematic diagram of the flared connector structure of this utility model.

[0019] In the diagram: 1. Corrugated aluminum alloy base tube; 2. Anodized layer; 3. Fluorocarbon resin coating; 4. Flared connector; 5. Rubber sealing ring; 6. Zinc-nickel alloy plating; 7. Anti-slip thread. Detailed Implementation

[0020] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Figures 1-4 In one embodiment of this utility model, a corrosion-resistant bending short pipe for automotive air conditioning includes a corrugated aluminum alloy base pipe 1. The outer surface of the corrugated aluminum alloy base pipe 1 is sequentially covered with an anodized layer 2 and a fluorocarbon resin coating 3. Both ends of the corrugated aluminum alloy base pipe 1 are provided with flared connecting parts 4. A rubber sealing ring 5 is embedded inside the flared connecting parts 4. The corrugation period of the corrugated aluminum alloy base pipe 1 is 8-12mm, and the corrugation peak height is 1.5-2.5mm.

[0022] The specific problem addressed in this embodiment is to solve the issue of short pipes corroding due to external environmental factors, resulting in reduced strength and service life. This invention utilizes a corrugated aluminum alloy base pipe 1 design, which improves flexibility while maintaining airflow. Optimized crest parameters enhance vibration fatigue resistance. The double-coating structure increases salt spray resistance time, extending the service life compared to traditional galvanized steel pipes. The flared connection 4, combined with an embedded rubber sealing ring 5, ensures airtightness even with reduced installation torque. The nano-silica-reinforced fluorocarbon resin coating 3 achieves a surface hardness of 4H, improving scratch resistance and effectively resisting gravel impacts under complex automotive chassis conditions. The zinc-nickel alloy plating 6 reduces the corrosion current density to 0.12 μA / cm² in condensate environments. 2 Together with the external coating, it forms a double anti-corrosion barrier. The introduction of cerium oxide corrosion inhibitor enhances the coating's self-healing ability, and it can still maintain a corrosion protection efficiency of >85% even at a high temperature of 120℃.

[0023] The fluorocarbon resin coating 3 contains 3-5% by mass of nano-silica particles, with a coating thickness of 80-120μm. The bending curvature of the corrugated aluminum alloy base tube 1 matches the layout of the automotive air conditioning piping, with the bending radius tolerance controlled within ±0.5D (D being the nominal diameter of the base tube). The inner wall of the base tube 1 is provided with a zinc-nickel alloy plating layer 6 with a thickness of 0.1-0.3mm. Through the design of the corrugated aluminum alloy base tube 1, flexibility is improved while maintaining airflow. Optimized crest parameters enhance vibration fatigue resistance. The double-coating structure increases salt spray resistance time, extending the lifespan compared to traditional galvanized steel pipes. The flared connection part 4, combined with the embedded rubber sealing ring 5, ensures airtightness even with reduced installation torque. The surface hardness of the nano-silica-reinforced fluorocarbon resin coating 3 reaches 4H, improving scratch resistance and effectively resisting gravel impacts under complex automotive chassis conditions. The zinc-nickel alloy plating layer 6 reduces the corrosion current density to 0.12μA / cm² in condensate environments. 2 Together with the external coating, it forms a double anti-corrosion barrier. The introduction of cerium oxide corrosion inhibitor enhances the coating's self-healing ability, and it can still maintain a corrosion protection efficiency of >85% even at a high temperature of 120℃.

[0024] In this specific embodiment, 0.5-1.2% by mass of cerium oxide corrosion inhibitor is added to the interior of the fluorocarbon resin coating 3. The introduction of cerium oxide corrosion inhibitor improves the self-healing ability of the coating and can still maintain a corrosion protection efficiency of >85% in a high temperature environment of 120°C. The flared connection part 4 adopts a 30° conical surface structure and its outer surface is provided with anti-slip threads 7. The conical connection structure combined with the anti-slip thread design ensures that the pipeline does not leak when the pressure bearing capacity reaches 3.5MPa, and the sealing retention rate is still guaranteed after repeated disassembly and assembly.

[0025] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0026] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant bending short pipe for automotive air conditioning, comprising a corrugated aluminum alloy base pipe (1), characterized in that: The outer surface of the corrugated aluminum alloy base tube (1) is sequentially covered with an anodized layer (2) and a fluorocarbon resin coating (3), and both ends of the corrugated aluminum alloy base tube (1) are provided with flared connecting parts (4), and the flared connecting parts (4) are inlaid with rubber sealing rings (5). The corrugated aluminum alloy base tube (1) has a corrugation period of 8-12 mm and a peak height of 1.5-2.5 mm.

2. The corrosion-resistant bent short pipe for automotive air conditioning according to claim 1, characterized in that: The fluorocarbon resin coating (3) contains 3-5% by mass of nano-silica particles and has a coating thickness of 80-120 μm.

3. The corrosion-resistant bent short pipe for automotive air conditioning according to claim 1, characterized in that: The bending curvature of the corrugated aluminum alloy base tube (1) matches the layout of the automotive air conditioning pipeline, and the bending radius tolerance is controlled within ±0.5D.

4. The corrosion-resistant bent short pipe for automotive air conditioning according to claim 1, characterized in that: The inner wall of the base tube (1) is provided with a zinc-nickel alloy plating layer (6) with a thickness of 0.1-0.3 mm.

5. A corrosion-resistant bent short pipe for automotive air conditioning according to claim 1, characterized in that: The fluorocarbon resin coating (3) contains 0.5-1.2% by mass of cerium oxide corrosion inhibitor.

6. The corrosion-resistant bent short pipe for automotive air conditioning according to claim 1, characterized in that: The flared connection part (4) adopts a 30° conical surface structure, and its outer surface is provided with anti-slip threads (7).

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