High-precision red copper pipe for refrigeration equipment

Abstract

The utility model discloses a kind of high-precision red copper pipes for refrigeration equipment, comprising: red copper pipe body, wall thickness tolerance is controlled in ±0.02mm range, the concentricity deviation of inner diameter and outer diameter is ≤0.05mm;The cross section of the red copper pipe body is non-circular structure, including the micro thread of inner wall setting and the corrugated structure of outer wall setting;The corrugated structure is composed of periodic undulating annular protrusion, the pitch of adjacent protrusion is 3~5mm, and the protrusion height is 0.5~1mm;The outer surface of the micro thread is covered with passivation layer entirely, and the passivation layer thickness is 5~10 μm.The high-precision red copper pipe for refrigeration equipment described in the utility model, through the synergistic effect of high-precision wall thickness and concentricity control, inner wall micro thread turbulent flow heat transfer enhancement, outer wall corrugated pressure structure and double anticorrosive coating, realizes refrigeration pipeline sealing improvement, heat exchange efficiency improvement, compression strength and corrosion resistance improvement.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, specifically a high-precision copper tube for refrigeration equipment. Background Technology

[0002] Currently, copper tubing is widely used in refrigeration equipment as refrigerant transport piping due to its excellent thermal conductivity, ductility, and corrosion resistance. However, traditional copper tubing still presents the following technical challenges in practical applications:

[0003] 1. Insufficient assembly precision: The wall thickness tolerance (usually ±0.05mm or more) and concentricity deviation of ordinary copper tubes are relatively large, resulting in poor sealing when assembled with refrigeration components (such as condensers and evaporators), which easily leads to refrigerant leakage and affects refrigeration efficiency;

[0004] 2. Limited heat exchange efficiency: The inner wall of traditional circular cross-section copper tubes is smooth, the refrigerant flows in a laminar flow state, the heat exchange area is small, and the heat exchange efficiency is low.

[0005] 3. Insufficient pressure resistance: When the refrigeration system is running, the copper pipes need to withstand the pressure fluctuations of the refrigerant and the vibration of the equipment. Ordinary copper pipes are prone to micro-cracks due to fatigue stress, and there is a risk of leakage after long-term use.

[0006] 4. Corrosion and durability issues: The outer wall of copper pipes is prone to oxidation and corrosion in humid or salt spray environments, while the inner wall may be chemically corroded when it comes into contact with acidic refrigerants or impurities, affecting the service life of the pipeline.

[0007] Therefore, we propose a high-precision copper tube for refrigeration equipment. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] To address the shortcomings of existing technologies, this utility model provides a high-precision copper tube for refrigeration equipment. Through the synergistic effect of high-precision wall thickness and concentricity control, enhanced heat transfer through micro-threaded turbulence on the inner wall, corrugated pressure-resistant structure on the outer wall, and double anti-corrosion coating, it achieves improved sealing performance, increased heat exchange efficiency, and enhanced pressure resistance and corrosion resistance of the refrigeration pipeline, effectively solving the problems in the background technology.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-precision copper tube for refrigeration equipment, comprising: a copper tube body, the wall thickness tolerance of which is controlled within ±0.02mm, and the concentricity deviation between the inner diameter and the outer diameter is ≤0.05mm; the cross-section of the copper tube body is a non-circular structure, including micro-threads on the inner wall and a corrugated structure on the outer wall; the corrugated structure is composed of periodically undulating annular protrusions, the spacing between adjacent protrusions is 3~5mm, and the protrusion height is 0.5~1mm; the outer surface of the micro-threads is fully covered with a passivation layer, the passivation layer thickness is 5~10μm; the surface of the micro-threads on the inner wall is covered with a thermally conductive protective film, the protective film thickness is ≤2μm, and the thermal conductivity is ≥50W / (m·K).

[0012] Preferably, the micro-thread is a continuous helical groove with a groove depth of 0.1~0.3mm, a pitch of 1~2mm, and a helix angle of 15°~30°.

[0013] Preferably, the spacing between adjacent protrusions of the corrugated structure is 3~5mm, the height of the protrusion is 0.5~1mm, and the width of the top of the protrusion is ≥0.3mm.

[0014] Preferably, the end of the copper tube body is provided with a connecting flare.

[0015] Preferably, the flaring angle of the connecting flare is 45°±2°, and the length of the flared section is ≥10mm.

[0016] Preferably, the passivation layer is a chromate or molybdate conversion film; the thermally conductive protective film is a graphene composite coating.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a high-precision copper tube for refrigeration equipment, which has the following advantages:

[0019] 1. This type of refrigeration equipment uses high-precision copper tubing with a wall thickness tolerance of ±0.02mm and a concentricity of ≤0.05mm to ensure a tight fit between the tubing and the refrigeration components, reducing assembly gaps and lowering refrigerant leakage rates (compared to traditional copper tubing). The flared connection structure (45°±2° standardized angle) avoids port deformation caused by on-site adjustments.

[0020] 2. This refrigeration equipment uses high-precision copper tubes with micro-threads on the inner wall (groove depth 0.1~0.3mm, pitch 1~2mm) to break the laminar flow state of the refrigerant. The turbulence effect improves the heat exchange efficiency. The thermally conductive protective film (graphene composite coating, thermal conductivity ≥50W / (m·K)) reduces thermal resistance loss under the premise of corrosion prevention, ensuring efficient heat exchange between the inner wall and the refrigerant.

[0021] 3. The high-precision copper tube used in this refrigeration equipment has a corrugated outer wall structure (protrusion height 0.5~1mm, top width ≥0.3mm) to improve radial compressive strength (≥8MPa) and absorb equipment vibration energy. The passivation layer (chromate / molybdate conversion film, thickness 5~10μm) fully covers the corrugated surface to improve corrosion resistance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a high-precision copper tube for refrigeration equipment according to this utility model.

[0023] Figure 2 This is a schematic cross-sectional view of one end of a high-precision copper tube for a refrigeration device according to the present invention.

[0024] In the diagram: 1. Copper tube body; 2. Corrugated structure; 3. Micro-thread; 4. Connecting flare; 5. Thermally conductive protective film; 6. Passivation layer. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] like Figure 1-2 As shown, this embodiment provides a high-precision copper tube for refrigeration equipment, including a copper tube body 1, which is made of TP2 grade copper through a precision cold rolling process. Its wall thickness tolerance is controlled within ±0.02mm, and the concentricity deviation between the inner and outer diameters is ≤0.05mm. The cross-section of the copper tube body 1 is a non-circular structure, and a near-elliptical design can be adopted in specific implementations.

[0027] Outer wall structure: The outer surface of the copper tube body 1 is provided with a corrugated structure 2, which is composed of periodic annular protrusions. The spacing between adjacent protrusions is 4mm (preferably within the range of 3~5mm), the height of the protrusion is 0.8mm (preferably within the range of 0.5~1mm), and the top width of the protrusion is designed to be 0.4mm (meeting the requirement of ≥0.3mm). The corrugated structure is processed by hydroforming process.

[0028] Inner wall structure: The inner wall of the copper tube body 1 is machined with a continuous spiral groove micro thread 3, with a groove depth of 0.2 mm (preferably 0.1~0.3 mm), a pitch of 1.5 mm (preferably 1~2 mm), and a helix angle of 20° (preferably 15°~30°). The surface of the micro thread 3 is electrochemically treated to form a chromate passivation layer 6 with a thickness of 8 μm (controlled within the range of 5~10 μm). A graphene composite coating is coated on top of the passivation layer 6 as a thermally conductive protective film 5 with a thickness of 1.5 μm (≤2 μm).

[0029] Connection structure: The two ends of the copper tube body 1 are connected to the flared end 4 by a flaring forming machine. The flaring angle is precisely controlled at 45° (tolerance ±2°), and the length of the flared section is 12mm (≥10mm) to ensure the sealing of the connection with the refrigeration component.

[0030] Through the synergistic effect of high-precision wall thickness and concentricity control, enhanced heat transfer through micro-threaded turbulence on the inner wall, corrugated pressure-resistant structure on the outer wall, and double anti-corrosion coating, the sealing performance of the refrigeration pipeline is improved, the heat exchange efficiency is increased, and the pressure resistance and corrosion resistance are enhanced.

[0031] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-precision copper tube for refrigeration equipment, characterized in that... ,include: The copper tube body (1) has a wall thickness tolerance controlled within ±0.02mm, and the concentricity deviation between the inner and outer diameters is ≤0.05mm; The cross-section of the copper tube body (1) is a non-circular structure, including micro-threads (3) on the inner wall and corrugated structure (2) on the outer wall. The corrugated structure (2) is composed of periodically undulating annular protrusions, with a spacing of 3~5mm between adjacent protrusions and a protrusion height of 0.5~1mm; The outer surface of the micro-thread (3) is fully covered with a passivation layer (6), the thickness of which is 5~10μm; The micro-threads (3) on the inner wall are covered with a thermally conductive protective film with a thickness of ≤2μm and a thermal conductivity of ≥50W / (m·K).

2. The high-precision copper tube for refrigeration equipment according to claim 1, characterized in that: The micro-thread (3) is a continuous spiral groove with a groove depth of 0.1~0.3mm, a pitch of 1~2mm, and a spiral angle of 15°~30°.

3. The high-precision copper tube for refrigeration equipment according to claim 1, characterized in that: The corrugated structure (2) has an adjacent protrusion spacing of 3~5mm, a protrusion height of 0.5~1mm, and a protrusion top width ≥0.3mm.

4. The high-precision copper tube for refrigeration equipment according to claim 1, characterized in that: The copper tube body (1) has a connecting flared end (4).

5. A high-precision copper tube for refrigeration equipment according to claim 4, characterized in that: The flaring angle of the connecting flare (4) is 45°±2°, and the length of the flared section is ≥10mm.

6. The high-precision copper tube for refrigeration equipment according to claim 5, characterized in that: The passivation layer (6) is made of chromate or molybdate conversion film; the thermally conductive protective film (5) is a graphene composite coating.

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