Copper tube and heat exchanger

Abstract

The application discloses a copper pipe containing copper and a first rare earth element; the content of the copper is greater than 99.8 parts by weight; the content of the first rare earth element is 0.005 to 0.035 parts by weight; and the first rare earth element comprises one or both of a mixture of neodymium and yttrium. The application also discloses a heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and more particularly to a copper tube and a heat exchanger. Background Technology

[0002] Due to the high sulfur content in the air, in environments with severe air pollution, such as tropical rainforests, humid environments, areas with poor air quality, and areas affected by vehicle exhaust and volcanic gases, the heat exchangers in air conditioners or refrigeration equipment, which contain copper pipes, are more susceptible to corrosion, leading to localized damage or leaks. Existing solutions include:

[0003] Solution 1: Allow for a larger corrosion allowance; however, this method will increase the amount of raw materials used, increase material costs, and increase the weight of the whole machine.

[0004] Solution 2: Apply a corrosion-resistant layer to the surface of the copper tube by spraying or electroplating. This could involve spraying a corrosion-resistant material or electroplating a protective metal layer such as tin. However, this method significantly increases production costs, and it's difficult to control the formation location of the corrosion-resistant layer during spraying. Often, the corrosion-resistant layer is sprayed onto surrounding components of the copper tube during manufacturing. For example, when spraying a corrosion-resistant layer onto the heat exchanger's heat pipes, the material is often sprayed onto the fins, reducing heat exchange efficiency. Furthermore, the uniformity of the sprayed and electroplated protective layers is poor, frequently resulting in missed areas and plating, leading to poor manufacturing reliability, low yield, and further increased production costs for air conditioners or refrigeration equipment. Summary of the Invention

[0005] This application aims to provide a copper tube and a heat exchanger using the same, achieving low cost, high uniformity, excellent corrosion resistance, long service life, and high reliability of the manufacturing process for copper tubes or heat exchangers using copper tubes.

[0006] The technical solution of this application embodiment is implemented as follows:

[0007] On the one hand, embodiments of this application provide a copper tube containing copper and a first type of rare earth element;

[0008] The copper content is greater than 99.8 parts by weight;

[0009] The first type of rare earth element has a weight part of 0.005 to 0.035; the first type of rare earth element includes one or a mixture of neodymium and yttrium.

[0010] On the other hand, embodiments of this application provide a heat exchanger, including:

[0011] Multiple fins, the multiple fins being arranged side by side;

[0012] A heat pipe, wherein the heat pipe is inserted into the plurality of fins, and at least a portion thereof is the aforementioned copper pipe.

[0013] This application provides an embodiment of a copper tube and a heat exchanger, wherein the copper tube contains copper and a first type of rare earth element; the copper content is greater than 99.8 parts by weight; the first type of rare earth element is 0.005 to 0.035 parts by weight; the first type of rare earth element includes one or a mixture of neodymium and yttrium. The copper tube or heat exchanger using the copper tube in this application embodiment has low cost, high uniformity, high tensile strength, excellent elongation, excellent corrosion resistance, long service life, high reliability of manufacturing process, and high production yield. Attached Figure Description

[0014] Figure 1 A schematic diagram of an optional structure of a copper tube provided in an embodiment of this application;

[0015] Figure 2 A schematic diagram of an optional structure of a copper tube provided in an embodiment of this application;

[0016] Figure 3 A schematic diagram of an optional structure of a copper tube provided in an embodiment of this application;

[0017] Figure 4 A schematic diagram illustrating the optional relationship between thread angle and stress provided for embodiments of this application;

[0018] Figure 5 A schematic diagram illustrating the optional relationship between the number of racks and stress provided in an embodiment of this application;

[0019] Figure 6 A schematic diagram illustrating the optional relationship between tooth root width and stress provided in an embodiment of this application;

[0020] Figure 7 A schematic diagram illustrating the optional relationship between tooth height and stress provided for embodiments of this application;

[0021] Figure 8 A schematic diagram illustrating the optional relationship between tooth tip angle and stress provided in an embodiment of this application;

[0022] Figure 9 A schematic diagram illustrating the optional relationship between thickness and stress provided for embodiments of this application;

[0023] Figure 10 A schematic diagram illustrating the optional effects of different internal thread parameters on stress, provided for embodiments of this application;

[0024] Figure 11 A schematic diagram illustrating the optional relationship between thread angle and weight provided for embodiments of this application;

[0025] Figure 12 A schematic diagram illustrating the optional relationship between the number of racks and their weight, provided for an embodiment of this application;

[0026] Figure 13 A schematic diagram illustrating the optional relationship between tooth root width and weight provided in an embodiment of this application;

[0027] Figure 14 A schematic diagram illustrating the optional relationship between tooth height and weight provided in an embodiment of this application;

[0028] Figure 15 A schematic diagram illustrating the optional relationship between tooth tip angle and weight provided in an embodiment of this application;

[0029] Figure 16 A schematic diagram illustrating the optional relationship between thickness and weight provided for embodiments of this application;

[0030] Figure 17 A schematic diagram illustrating the optional effects of different internal thread parameters on weight, provided in an embodiment of this application.

[0031] Figure 18 A schematic diagram illustrating the optional effects of different internal thread parameters on heat transfer performance, provided in the embodiments of this application.

[0032] Figure 19 A schematic diagram illustrating the optional effects of different internal thread parameters on the machining process, provided in an embodiment of this application.

[0033] Figure 20 This is a schematic diagram showing the optional distribution of the effects of different internal thread parameters on copper tubes, provided for embodiments of this application. Detailed Implementation

[0034] The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

[0035] This application provides a copper tube comprising copper (Cu+) and a first type of rare earth element, wherein the copper content is greater than 99.8 parts by weight; the first type of rare earth element is 0.005 to 0.035 parts by weight; the first type of rare earth element includes one or a mixture of two of neodymium (Nd) and yttrium (Y).

[0036] In one example, the first type of rare earth element is 0.005 parts by weight.

[0037] In one example, the first type of rare earth element is 0.02 parts by weight.

[0038] In one example, the first type of rare earth element is 0.032 parts by weight.

[0039] In one example, the first type of rare earth element is 0.035 parts by weight.

[0040] In this embodiment of the application, the first type of rare earth element is composed of one or a mixture of neodymium and yttrium. In one example, the first type of rare earth element is neodymium. In another example, the first type of rare earth element is yttrium. In yet another example, the first type of rare earth element is a mixture of neodymium and yttrium.

[0041] In some embodiments, the neodymium is present in parts by weight of 0.01 to 0.025.

[0042] Taking neodymium, a rare earth element of the first category, as an example, the copper tube contains the following parts by weight of neodymium: 0.01, 0.012, 0.02, 0.023, or 0.025.

[0043] In some embodiments, the yttrium is present in parts by weight of 0.005 to 0.01.

[0044] Taking yttrium, a rare earth element of the first category, as an example, the copper tube contains the following parts by weight of yttrium: 0.005, 0.008, 0.009, or 0.01.

[0045] Taking the first category of rare earth elements, including neodymium and yttrium, as an example, the weight percentages of neodymium and yttrium in a copper tube may include:

[0046] 0.012 parts by weight of neodymium and 0.005 parts by weight of yttrium;

[0047] 0.02 parts by weight of neodymium and 0.008 parts by weight of yttrium;

[0048] 0.023 parts by weight of neodymium and 0.009 parts by weight of yttrium;

[0049] 0.025 parts by weight of neodymium and 0.01 parts by weight of yttrium.

[0050] It should be noted that, after extensive verification, the inventors found that a neodymium weight ratio of 0.01 to 0.025 and a yttrium weight ratio of 0.005 to 0.01 can result in copper tubes with higher uniformity, higher tensile strength, better elongation, better corrosion resistance, and significantly longer service life, while also having lower costs.

[0051] In some embodiments, the copper tube further includes phosphorus (P); the phosphorus is present in a fraction of less than 0.003 parts by weight.

[0052] Here, the phosphorus in the copper tube can be a phosphorus mixture, such as deoxidized copper phosphorus (TP2). In this embodiment, no limitation is made on the phosphorus mixture.

[0053] In one example, the weight of phosphorus is 0.001.

[0054] In one example, the weight of phosphorus is 0.003.

[0055] In the case where the phosphorus in the copper tube is a phosphorus mixture, the weight of the phosphorus mixture is less than 0.003.

[0056] In some embodiments, the copper tube further includes a second type of rare earth element, wherein the second type of rare earth element has a weight ratio of 0.005 to 0.02.

[0057] The weight parts of the second rare earth element may include one of the following: 0.005, 0.01, 0.012, 0.015, or 0.02.

[0058] In some embodiments, the total weight of the first type of rare earth element and the second type of rare earth element is less than 0.05.

[0059] When the copper tube contains both Class I and Class II rare earth elements, and the weight percentage of Class I rare earth elements is 0.005 to 0.035 and the weight percentage of Class II rare earth elements is 0.005 to 0.02, the total weight percentage of Class I and Class II rare earth elements is less than 0.05.

[0060] In some embodiments, the second type of rare earth element includes lanthanum (La).

[0061] In this embodiment of the application, the second rare earth element may also include other rare earth elements besides neodymium, yttrium, and lanthanum.

[0062] In some embodiments, where the first type of element comprises a mixture of neodymium and yttrium, the copper tube comprises one of the following:

[0063] Composition 1: 0.005 parts by weight of lanthanum, 0.012 parts by weight of neodymium, and 0.005 parts by weight of yttrium;

[0064] Composition 2: 0.012 parts by weight of lanthanum, 0.02 parts by weight of neodymium, and 0.008 parts by weight of yttrium;

[0065] Composition 3: 0.016 parts by weight of lanthanum, 0.023 parts by weight of neodymium, and 0.009 parts by weight of yttrium;

[0066] Composition 4: 0.02 parts by weight of lanthanum, 0.025 parts by weight of neodymium, and 0.01 parts by weight of yttrium.

[0067] Here, the rare earth element content in the copper tube is any one of the above-mentioned configurations 1 to 4, and it has excellent mechanical properties such as tensile strength and elongation.

[0068] The copper tube provided in this application embodiment has superior mechanical properties compared to copper tubes that use rare earth element content as a comparison method. Specifically, in the comparison method, the weight parts of lanthanum are less than 0.005 or greater than 0.02, the weight parts of neodymium are less than 0.01 or greater than 0.025, and the weight parts of yttrium are less than 0.005 or greater than 0.01.

[0069] The mechanical properties of the four configuration methods and the comparison methods are shown in Table 1.

[0070] Table 1. Comparison of mechanical properties between the configurations and comparative methods provided in this application.

[0071]

[0072] In Table 1, in Comparative Method 1 and Comparative Method 2, the weight parts of lanthanum are less than 0.005, neodymium are less than 0.01, and yttrium are less than 0.005. In Comparative Method 3, the weight parts of neodymium are greater than 0.025, and the weight parts of the first rare earth element are 0.04. As can be seen from Table 1, when the weight parts of lanthanum are 0.005 to 0.02, neodymium are 0.01 to 0.025, and yttrium are 0.005 to 0.01, the copper provided in the embodiments of this application has excellent tensile strength and elongation.

[0073] In some embodiments, the diameter (outer diameter) of the copper tube is 4.9 mm to 5.05 mm.

[0074] The diameter of a copper pipe refers to the diameter of the circle formed by the outer surface of the copper pipe.

[0075] The diameter of the copper tube is one of the following: 4.9 mm, 4.95 mm, 4.98 mm, 5.0 mm, and 5.05 mm.

[0076] In some embodiments, the copper tube is provided with an internal thread, the internal thread having a helix angle.

[0077] like Figure 1 and Figure 2 As shown, the inner diameter of the copper tube is provided with multiple internal threads, and the internal threads are set with a helix angle β.

[0078] The inner surface of the copper tube 100 is provided with an internal thread 101 with a helix angle β.

[0079] In some embodiments, the helix angle ranges from 18 to 25 degrees.

[0080] In this application, the helix angle may include 18 degrees (°), 19°, 19.5°, 20°, and 25°. This application does not limit the specific value between 18 and 25.

[0081] In some embodiments, the internal thread is formed by alternating grooves and racks, the racks having a cross-section that is a triangle with an arc at the top, and adjacent racks having grooves that are inverted trapezoidal in shape.

[0082] like Figure 3 As shown, the internal thread is formed by the spaced tooth grooves 104 and racks 103. The cross-section of the rack 103 is a triangle with an arc at the top. The adjacent racks 103 have inverted trapezoidal tooth grooves 104.

[0083] In some embodiments, the threaded transition 105 where the rack 103 connects to the toothed groove 104 is a curved section with an arc.

[0084] In this embodiment of the application, the internal thread parameters of the copper tube include: tooth tip angle α, tooth root width L, tooth groove width W, tooth height H, thickness T, number of teeth N, and tooth-to-groove ratio δ; wherein, as shown in the example... Figure 3 As shown, the tooth tip angle α is the arc of the top of the rack 103, the tooth base width L is the width of the bottom of the rack 103, the tooth groove width W is the width of the bottom of the tooth groove 104, the tooth height H is the height of the rack 103, the thickness T is the thickness between the bottom of the tooth groove 104 and the outer diameter of the copper tube, the number of racks N is the number of racks 103 inside the copper tube, and the rack-groove ratio δ is the ratio of the tooth base width L to the tooth groove width W, i.e., δ = L / W.

[0085] In some embodiments, the thickness between the groove and the outer diameter of the copper tube is 0.18 mm to 0.21 mm.

[0086] Here, the thickness T may include 0.18 mm, 0.19 mm, 0.2 mm or 0.21 mm.

[0087] In some embodiments, the width of the bottom of the rack is the tooth base width, the width of the bottom of the tooth groove is the tooth groove width, and the ratio of the tooth base width to the tooth groove width is 0.6 to 0.85.

[0088] Here, the ratio of the tooth root width to the tooth groove width, i.e., the groove ratio δ, may include 0.6, 0.7, 0.75, or 0.85.

[0089] In this embodiment of the application, the internal thread parameters of the copper tube may also be set to at least one of the following:

[0090] The tooth height ranges from 0.11 mm to 0.14 mm;

[0091] Tooth tip angle is 8 to 20 degrees;

[0092] The number of racks ranges from 39 to 52.

[0093] The embodiment of this application provides the following performance advantages: heat exchange efficiency is increased by more than 15%, cost is reduced by more than 10%, stress is reduced by 10%, and corrosion rate is reduced.

[0094] Here, Tables 2 to 5 are different examples of copper tubes provided in the embodiments of this application.

[0095] Table 2. Examples of Copper Pipes

[0096] Thickness (mm) 0.2 Helix angle (°) 22 Tooth width (mm) 0.129 δ 0.68

[0097] The performance test results of the copper tubes in Table 2 are as follows: weight 32.2 grams per meter, stress 115 MPa, and internal thermal conductivity 7542 watts per square meter per kWh (W / (m)). 2 The anthill corrosion perforation rate was 24.8%, and the uniform corrosion current density was 2.85 microamps per square centimeter (μA / cm²). 2 ).

[0098] Table 3. Examples of Copper Pipes

[0099] Thickness (mm) 0.18 Helix angle (°) 22 Tooth width (mm) 0.129 δ 0.78

[0100] The performance test results of the copper tubes in Table 3 are as follows: weight 30.3 grams per meter, stress 124 MPa, and internal thermal conductivity 7682 W / (m). 2 • K), the ant hole corrosion perforation rate was 24.2%, and the uniform corrosion current density was 2.78 μA / cm. 2 .

[0101] Table 4. Examples of Copper Pipes

[0102]

[0103] The performance test results of the copper tubes in Table 4 are as follows: weight 31.3 grams per meter, stress 120 MPa, and internal thermal conductivity 7712 W / (m). 2 • K), the ant hole corrosion perforation rate is 25.3%, and the uniform corrosion current density is 2.95 μA / cm. 2 .

[0104] Table 5. Examples of Copper Pipes

[0105] Thickness (mm) 0.21 Helix angle (°) 18 Tooth width (mm) 0.18 δ 1.07

[0106] The performance test results of the copper tubes in Table 5 are as follows: weight 35 grams per meter, stress 139 MPa, and internal thermal conductivity 6408 W / (m²). 2 • K), the ant hole corrosion perforation rate was 48.9%, and the uniform corrosion current density was 4.38 μA / cm. 2 .

[0107] Based on the comparison of copper tubes shown in Tables 2 to 5 above, it can be seen that when the copper tube contains Class I rare earth elements and δ does not exceed 0.85, the performance of the copper tube is significantly better than that of the copper tube that does not contain Class I rare earth elements and δ exceeds 0.85.

[0108] As can be seen from the experimental data shown in Tables 2 to 5, the copper tubes provided in this application have low cost, high uniformity, high tensile strength, excellent elongation, excellent corrosion resistance, long service life, high reliability of manufacturing process, and high production yield.

[0109] In this embodiment, different values ​​of the internal thread parameters result in different performance characteristics of the copper tube. Therefore, the value of the internal thread parameters can affect the performance of the copper tube. Performance parameters reflecting the copper tube's performance may include: stress, weight, heat transfer performance, and processing technology. The processing technology includes manufacturing reliability, processing speed, and yield rate, among other processing performance characteristics.

[0110] Below, using a 70mm long copper pipe as an example, the relationship between different internal thread parameters and stress and weight is explained. The relationships between different internal thread parameters and stress and weight are as follows: Figures 4 to 9 , Figures 11 to 16 As shown.

[0111] Taking the helix angle as the internal thread parameter and stress as the performance parameter as an example, the correspondence between the helix angle and stress is as follows: Figure 4 As shown, here, all copper tube parameters except the helix angle remain unchanged. For example... Figure 4As shown, the stress is 172.34 when the helix angle is 10°, 172.45 when the helix angle is 11.45°, 172.56 when the helix angle is 12.91°, 172.67 when the helix angle is 14.37°, 172.79 when the helix angle is 15.83°, 172.97 when the helix angle is 17.29°, 173.2 when the helix angle is 18.75°, 173.45 when the helix angle is 20.2°, 173.7 when the helix angle is 21.66°, 173.9 when the helix angle is 23.12°, 173.9 when the helix angle is 24.58°, 174.05 when the helix angle is 26.04°, 174.11 when the helix angle is 27.5°, and 174.07 when the helix angle is 17.5°. The stress is 173.92 when the helix angle is 28.95°, 173.67 when the helix angle is 30.41°, 173.33 when the helix angle is 31.875°, 172.98 when the helix angle is 33.33°, 172.69 when the helix angle is 34.79°, 172.51 when the helix angle is 36.25°, 172.43 when the helix angle is 37.7°, 172.45 when the helix angle is 39.16°, 172.53 when the helix angle is 40.62°, 172.58 when the helix angle is 42.08°, 172.54 when the helix angle is 43.54°, and 172.40 when the helix angle is 45°. The unit for the helix angle is °, and the unit for the stress is megapascal (MPa). Figure 4 It can be determined that when the helix angle is less than 25.7, the stress increases with the increase of the helix angle, and when the helix angle is greater than 25.7, the stress decreases with the increase of the helix angle.

[0112] Taking the number of rack teeth as the internal thread parameter and stress as the performance parameter as an example, the relationship between the number of rack teeth and stress can be expressed as follows: Figure 5 As shown, here, all copper tube parameters except for the number of racks remain unchanged. For example... Figure 5As shown, the stress is 160.3 when the number of racks is 49, 160.1 when the number of racks is 50, 159.8 when the number of racks is 51, 160.1 when the number of racks is 52, 160.9 when the number of racks is 53, 162.1 when the number of racks is 54, 164.3 when the number of racks is 55, 167.2 when the number of racks is 56, 169.8 when the number of racks is 57, 171.8 when the number of racks is 58, and 174 when the number of racks is 59. The stress is 176 MPa when the number of racks is 60; 177.9 MPa when the number of racks is 61; 179.7 MPa when the number of racks is 62; 181.7 MPa when the number of racks is 63; 182.7 MPa when the number of racks is 64; 182.8 MPa when the number of racks is 65; 181.5 MPa when the number of racks is 66; 179.1 MPa when the number of racks is 67; 176.5 MPa when the number of racks is 68; and 174.3 MPa when the number of racks is 69. The number of racks is per rack, and the stress is in MPa. Figure 5 It can be determined that when the number of racks is less than 51 or greater than 65, the stress decreases as the number of racks increases; when the number of racks is between 51 and 65, the stress increases as the number of racks increases.

[0113] Taking the tooth root width as the internal thread parameter and the stress as the performance parameter as an example, the correspondence between the tooth root width and the stress is as follows: Figure 6 As shown, here, all copper tube parameters except for the tooth root width remain unchanged. For example... Figure 6As shown, when the tooth root width is 0.1, the stress is 162.98; when the tooth root width is 0.103, the stress is 164.21; when the tooth root width is 0.106, the stress is 165.96; when the tooth root width is 0.11, the stress is 168; when the tooth root width is 0.113, the stress is 170; when the tooth root width is 0.116, the stress is 171.74; and when the tooth root width is 0.12, the stress is... 173. When the tooth root width is 0.123, the stress is 173.74; when the tooth root width is 0.126, the stress is 174.05; when the tooth root width is 0.13, the stress is 174.17; when the tooth root width is 0.133, the stress is 174.19; when the tooth root width is 0.136, the stress is 174.15; when the tooth root width is 0.14, the stress is 174.07; when the tooth root width is... The stress is 173.96 when the tooth root width is 0.143, 173.87 when the tooth root width is 0.15, 173.84 when the tooth root width is 0.153, 173.95 when the tooth root width is 0.156, 174.41 when the tooth root width is 0.16, and 175.66 when the tooth root width is 0.1633. The stress is 177.73 when the tooth root width is 0.166, 180.44 when the tooth root width is 0.17, 183.38 when the tooth root width is 0.173, 186.07 when the tooth root width is 0.176, 188.09 when the tooth root width is 0.18, and 189.08 when the tooth root width is 0.18. The unit for tooth root width is mm, and the unit for stress is MPa. Based on... Figure 6 It can be determined that when the tooth root width is less than 0.133 or greater than 0.15, the stress increases with the increase of the tooth root width. When the tooth root width is between 0.133 and 0.15, the stress decreases slightly with the increase of the tooth root width.

[0114] Taking the tooth height as the internal thread parameter and the stress as the performance parameter as an example, the correspondence between tooth height and stress is as follows: Figure 7 As shown, here, all copper tube parameters except for the tooth height remain unchanged. For example... Figure 7As shown, the stress is 173.31 when the tooth height is 0.09, 173.52 when the tooth height is 0.094, 173.71 when the tooth height is 0.098, 173.88 when the tooth height is 0.102, 174.02 when the tooth height is 0.106, 174.14 when the tooth height is 0.111, 174.22 when the tooth height is 0.119, 174.28 when the tooth height is 0.123, 174.30 when the tooth height is 0.127, 174.30 when the tooth height is 0.131, 174.25 when the tooth height is 0.135, 174.18 when the tooth height is 0.14, and 174 when the tooth height is 0.14. 07. When the tooth height is 0.144, the stress is 173.93; when the tooth height is 0.148, the stress is 173.75; when the tooth height is 0.152, the stress is 173.54; when the tooth height is 0.156, the stress is 173.30; when the tooth height is 0.16, the stress is 173.04; when the tooth height is 0.165, the stress is 172.75; when the tooth height is 0.169, the stress is 172.43; when the tooth height is 0.173, the stress is 172.1; when the tooth height is 0.177, the stress is 171.75; when the tooth height is 0.181, the stress is 171.38; when the tooth height is 0.185, the stress is 171; when the tooth height is 0.19, the stress is 170.61. The unit for tooth height is mm, and the unit for stress is MPa. Based on... Figure 7 It can be determined that when the tooth height is less than 0.123, the stress increases with the increase of the tooth height, and when the tooth height is less than 0.123, the stress decreases with the increase of the tooth height.

[0115] Taking the tooth tip angle as the parameter of an internal thread and stress as the performance parameter as an example, the correspondence between the tooth tip angle and stress is as follows: Figure 8 As shown, here, all copper tube parameters except for the tooth tip angle remain unchanged. For example... Figure 8As shown, the stress is 171.64 when the tooth tip angle is 10°, 171.92 when the tooth tip angle is 11.5°, 172.19 when the tooth tip angle is 13°, 172.45 when the tooth tip angle is 14.5°, 172.69 when the tooth tip angle is 16°, 172.92 when the tooth tip angle is 17.5°, 173.13 when the tooth tip angle is 19°, 173.33 when the tooth tip angle is 20.5°, 173.51 when the tooth tip angle is 22°, 173.68 when the tooth tip angle is 23.5°, 173.82 when the tooth tip angle is 25°, 173.96 when the tooth tip angle is 26.5°, and 174.07 when the tooth tip angle is 28°. When the tooth tip angle is 29.5°, the stress is 174.16 MPa; when the tooth tip angle is 31°, the stress is 174.24 MPa; when the tooth tip angle is 32.5°, the stress is 174.3 MPa; when the tooth tip angle is 34°, the stress is 174.34 MPa; when the tooth tip angle is 35.5°, the stress is 174.37 MPa; when the tooth tip angle is 37°, the stress is 174.38 MPa; when the tooth tip angle is 38.5°, the stress is 174.37 MPa; when the tooth tip angle is 40°, the stress is 174.34 MPa; when the tooth tip angle is 41.5°, the stress is 174.30 MPa; when the tooth tip angle is 43°, the stress is 174.24 MPa; when the tooth tip angle is 44.5°, the stress is 174.17 MPa; and when the tooth tip angle is 46°, the stress is 174.08 MPa. The unit for tooth tip angle is °, and the unit for stress is MPa. Figure 8 It can be determined that when the tooth tip angle is less than 37°, the stress increases with the increase of the tooth tip angle, and when the tooth tip angle is greater than 37°, the stress decreases with the increase of the tooth root width.

[0116] Taking the thickness as the parameter of the internal thread and the stress as the performance parameter as an example, the correspondence between the tooth tip angle and the stress is as follows: Figure 9 As shown, here, all copper tube parameters except thickness remain unchanged. Figure 9As shown, the stress is 164.07 when the thickness is 0.212 mm, 164.93 mm when the thickness is 0.210 mm, 165.8 mm when the thickness is 0.209 mm, 166.67 mm when the thickness is 0.208 mm, 167.54 mm when the thickness is 0.206 mm, 168.411 mm when the thickness is 0.205 mm, 169.27 mm when the thickness is 0.203 mm, 170.12 mm when the thickness is 0.202 mm, 170.95 mm when the thickness is 0.201 mm, 171.77 mm when the thickness is 0.199 mm, 172.56 mm when the thickness is 0.198 mm, 173.33 mm when the thickness is 0.196 mm, and 174.07 mm when the thickness is 0.195 mm. When the thickness is 0.193 mm, the stress is 174.77 MPa; when the thickness is 0.192 mm, the stress is 175.45 MPa; when the thickness is 0.191 mm, the stress is 176.08 MPa; when the thickness is 0.189 mm, the stress is 176.68 MPa; when the thickness is 0.188 mm, the stress is 177.23 MPa; when the thickness is 0.186 mm, the stress is 177.74 MPa; when the thickness is 0.185 mm, the stress is 178.21 MPa; when the thickness is 0.184 mm, the stress is 178.64 MPa; when the thickness is 0.182 mm, the stress is 179.03 MPa; when the thickness is 0.181 mm, the stress is 179.37 MPa; when the thickness is 0.179 mm, the stress is 179.67 MPa; and when the thickness is 0.1783 mm, the stress is 179.948 MPa. The thickness units are mm and the stress units are MPa. Figure 9 It can be determined that the stress increases with the increase of thickness.

[0117] based on Figures 4 to 9 The relationship between different internal thread parameters and stress shown can be used to determine the distribution of the influence of each internal thread parameter on the stress of the copper tube. Figure 10 As shown, the internal thread parameters are sorted according to their influence on stress as follows: tooth root width, number of teeth, thickness, tooth height, tooth tip angle, and helix angle. Among them, tooth root width has the greatest impact on stress, while helix angle has the least impact.

[0118] Taking the helix angle as the internal thread parameter and weight as the performance parameter as an example, the relationship between the helix angle and weight is as follows: Figure 11 As shown, here, all copper tube parameters except the helix angle remain unchanged. For example... Figure 11As shown, the weight is 2.39 when the helix angle is 10°, 2.39 when the helix angle is 11.45°, 2.39 when the helix angle is 12.91°, 2.39 when the helix angle is 14.37°, 2.39 when the helix angle is 15.83°, 2.39 when the helix angle is 17.29°, 2.39 when the helix angle is 18.75°, 2.39 when the helix angle is 20.20°, 2.39 when the helix angle is 21.66°, 2.39 when the helix angle is 23.12°, 2.39 when the helix angle is 24.58°, 2.39 when the helix angle is 26.04°, and 2.39 when the helix angle is 27.5°. 39. When the helix angle is 28.95°, the weight is 2.39g; when the helix angle is 30.41°, the weight is 2.39g; when the helix angle is 31.87°, the weight is 2.39g; when the helix angle is 33.33°, the weight is 2.39g; when the helix angle is 34.79°, the weight is 2.39g; when the helix angle is 36.25°, the weight is 2.39g; when the helix angle is 37.70°, the weight is 2.39g; when the helix angle is 39.1°, the weight is 2.39g; when the helix angle is 40.62°, the weight is 2.39g; when the helix angle is 42.08°, the weight is 2.39g; when the helix angle is 43.54°, the weight is 2.39g; when the helix angle is 45°, the weight is 2.39g. The unit of helix angle is °, and the unit of weight is grams (g). According to... Figure 11 It can be determined that the weight of the copper tube does not change with the change of the helix angle.

[0119] Taking the number of racks as the internal thread parameter and weight as the performance parameter as an example, the relationship between the number of racks and weight is as follows: Figure 12 As shown, here, all copper tube parameters except for the number of racks remain unchanged. For example... Figure 12As shown, the weight is 2.336 when the number of racks is 49, 2.344 when the number of racks is 50, 2.35 when the number of racks is 51, 2.35 when the number of racks is 52, 2.356 when the number of racks is 53, 2.362 when the number of racks is 54, 2.368 when the number of racks is 55, 2.374 when the number of racks is 56, 2.379 when the number of racks is 57, 2.388 when the number of racks is 58, 2.394 when the number of racks is 59, and 2.4 when the number of racks is 59. The weight is 2.406 when the number of racks is 60, 2.412 when the number of racks is 61, 2.418 when the number of racks is 62, 2.425 when the number of racks is 63, 2.431 when the number of racks is 64, 2.437 when the number of racks is 65, 2.443 when the number of racks is 66, 2.45 when the number of racks is 67, 2.45 when the number of racks is 68, 2.456 when the number of racks is 69, and 2.462 when the number of racks is 60. The unit for the number of racks is racks, and the unit for the weight is grams. Figure 12 It can be determined that the weight of the copper tube increases with the increase of the number of racks.

[0120] Taking the tooth root width as the internal thread parameter and the weight as the performance parameter as an example, the relationship between the tooth root width and the weight is as follows: Figure 13 As shown, here, all copper tube parameters except for the tooth root width remain unchanged. For example... Figure 13As shown, the weight is 2.33 when the tooth root width is 0.1; 2.335 when the tooth root width is 0.103; 2.341 when the tooth root width is 0.106; 2.347 when the tooth root width is 0.113; 2.353 when the tooth root width is 0.116; 2.359 when the tooth root width is 0.12; 2.364 when the tooth root width is 0.123; 2.37 when the tooth root width is 0.126; 2.376 when the tooth root width is 0.13; 2.382 when the tooth root width is 0.133; 2.388 when the tooth root width is 0.136; 2.393 when the tooth root width is 0.14; and 2.3 when the tooth root width is 0.14. The following tooth widths are given: 0.143 mm and 2.405587 g; 0.146 mm and 2.411 g; 0.15 mm and 2.417 g; 0.153 mm and 2.423 g; 0.156 mm and 2.428 g; 0.16 mm and 2.434 g; 0.163 mm and 2.44 g; 0.166 mm and 2.446 g; 0.17 mm and 2.452 g; 0.173 mm and 2.457 g; 0.176 mm and 2.463 g; 0.18 mm and 2.469 g. All tooth widths are in mm and weights are in g. Figure 13 It can be determined that the weight of the copper tube increases with the increase of the tooth root width.

[0121] Taking the tooth height as the internal thread parameter and the weight as the performance parameter as an example, the relationship between tooth height and weight is as follows: Figure 14 As shown, here, all copper tube parameters except for the tooth height remain unchanged. For example... Figure 14As shown, the weight is 2.288 when the tooth height is 0.09, 2.298 when the tooth height is 0.094, 2.308 when the tooth height is 0.098, 2.318 when the tooth height is 0.106, 2.328 when the tooth height is 0.11, 2.337 when the tooth height is 0.115, 2.347 when the tooth height is 0.119, 2.356 when the tooth height is 0.123, 2.365 when the tooth height is 0.127, 2.374 when the tooth height is 0.131, 2.382 when the tooth height is 0.135, 2.391 when the tooth height is 0.14, and 2. 3. When the tooth height is 0.144, the weight is 2.4; when the tooth height is 0.148, the weight is 2.415; when the tooth height is 0.152, the weight is 2.423; when the tooth height is 0.156, the weight is 2.431; when the tooth height is 0.16, the weight is 2.439; when the tooth height is 0.165, the weight is 2.44; when the tooth height is 0.169, the weight is 2.453; when the tooth height is 0.173, the weight is 2.46; when the tooth height is 0.177, the weight is 2.467; when the tooth height is 0.181, the weight is 2.474; when the tooth height is 0.185, the weight is 2.48; when the tooth height is 0.19, the weight is 2.487. The unit for tooth height is mm, and the unit for weight is g. According to... Figure 14 It can be determined that the weight of the copper tube increases with the increase of the tooth height.

[0122] Taking the tooth tip angle as the internal thread parameter and weight as the performance parameter as an example, the relationship between the tooth tip angle and weight is as follows: Figure 15 As shown, here, all copper tube parameters except for the tooth tip angle remain unchanged. For example... Figure 15As shown, the weight is 2.441 when the tooth tip angle is 10°, 2.438 when the tooth tip angle is 11.5°, 2.434 when the tooth tip angle is 13°, 2.431 when the tooth tip angle is 14.5°, 2.427 when the tooth tip angle is 16°, 2.424 when the tooth tip angle is 17.5°, 2.424 when the tooth tip angle is 19°, 2.42 when the tooth tip angle is 20.5°, 2.417 when the tooth tip angle is 22°, 2.413 when the tooth tip angle is 22°, 2.413 when the tooth tip angle is 23.5°, 2.41 when the tooth tip angle is 25°, 2.406 when the tooth tip angle is 26.5°, 2.403 when the tooth tip angle is 28°, and 2.3 when the tooth tip angle is 28°. The weight is 2.396g when the tooth tip angle is 29.5°, 2.392g when the tooth tip angle is 31°, 2.389g when the tooth tip angle is 32.5°, 2.385g when the tooth tip angle is 34°, 2.382g when the tooth tip angle is 35.5°, 2.382g when the tooth tip angle is 37°, 2.3787g when the tooth tip angle is 38.5°, 2.375g when the tooth tip angle is 40°, 2.371g when the tooth tip angle is 41.5°, 2.368g when the tooth tip angle is 43°, 2.364g when the tooth tip angle is 44.5°, 2.361g when the tooth tip angle is 46°, and 2.357g when the tooth tip angle is 46°. The unit for tooth tip angle is °, and the unit for weight is g. Figure 15 It can be determined that the weight of the copper tube increases with the increase of the tooth apex angle.

[0123] Taking the thickness as the internal thread parameter and the weight as the performance parameter as an example, the relationship between the tooth tip angle and the weight is as follows: Figure 16 As shown, here, all copper tube parameters except thickness remain unchanged. Figure 16As shown, the weight is 2.53 when the thickness is 0.212mm; 2.519mm when the thickness is 0.21mm; 2.508mm when the thickness is 0.209mm; 2.497mm when the thickness is 0.208mm; 2.487mm when the thickness is 0.206mm; 2.476mm when the thickness is 0.205mm; 2.465mm when the thickness is 0.203mm; 2.454mm when the thickness is 0.202mm; 2.443mm when the thickness is 0.201mm; 2.432mm when the thickness is 0.199mm; 2.421mm when the thickness is 0.198mm; 2.41mm when the thickness is 0.196mm; and 2.3mm when the thickness is 0.195mm. The thickness is 0.193 mm and the weight is 2.388 g; the thickness is 0.192 mm and the weight is 2.377 g; the thickness is 0.191 mm and the weight is 2.367 g; the thickness is 0.189 mm and the weight is 2.356 g; the thickness is 0.188 mm and the weight is 2.345 g; the thickness is 0.186 mm and the weight is 2.334 g; the thickness is 0.185 mm and the weight is 2.323 g; the thickness is 0.184 mm and the weight is 2.312 g; the thickness is 0.182 mm and the weight is 2.301 g; the thickness is 0.181 mm and the weight is 2.29 g; the thickness is 0.179 mm and the weight is 2.279 g; the thickness is 0.178 mm and the weight is 2.268 g. The units for thickness are mm and the units for weight are g. Figure 16 It can be determined that the weight of the copper tube increases with the increase of its thickness.

[0124] In this embodiment, the influence of each internal thread parameter on the weight of the copper tube is as follows: Figure 17 As shown, the different thread parameters are ordered from largest to smallest in terms of their impact on weight as follows: thickness, tooth height, tooth tip angle, helix angle, and number of racks.

[0125] The influence of various internal thread parameters on the heat transfer performance of copper tubes is as follows: Figure 18 As shown, the different thread parameters, in descending order of their impact on heat exchange performance, are: tooth height, helix angle, rack, tooth tip angle, and thickness.

[0126] The influence of various internal thread parameters on the processing technology of copper tubes is as follows: Figure 19 As shown, the different thread parameters, ranked from largest to smallest in terms of their impact on the machining process, are: helix angle, tooth height, tooth tip angle, number of racks, and thickness.

[0127] based on Figure 10 , Figures 17 to 19 The analysis of the influence of various internal thread parameters on the different properties of copper tubes can determine the weight distribution of different internal thread parameters, such as... Figure 20 As shown, the number of racks and the tooth tip angle have relatively small effects on weight, heat transfer, and machining processes. According to... Figure 20The weighted distribution of the influence of different internal thread parameters on the performance of copper tubes is shown in Table 6. The parameters of the copper tubes in this embodiment are shown in Table 6.

[0128] Table 6. Parameter Examples of Copper Pipes

[0129]

[0130]

[0131] As shown in Table 6, the copper tube 2 provided in this application embodiment has the characteristics of low stress, strong heat exchange performance, and low weight per unit length compared to the copper tube 1. Therefore, this application embodiment can provide a copper tube with low cost and high performance. The copper tube provided in this application embodiment also has the characteristics of excellent corrosion resistance, long service life, high tensile strength, excellent elongation, high manufacturing process reliability, and high production yield.

[0132] This application also provides a heat exchanger. The heat exchanger includes: a plurality of fins arranged side by side; and a heat-conducting pipe that passes through the plurality of fins, at least a portion of which is the copper pipe described above.

[0133] The heat exchanger provided in this application embodiment has low cost, excellent corrosion resistance, long service life, high heat exchange efficiency, and all the characteristics and advantages of the copper tubes mentioned above, which will not be elaborated further here.

[0134] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0135] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A copper tube, characterized in that, The copper tube contains copper and Class I rare earth elements; The copper content is greater than 99.8 parts by weight; The first type of rare earth element has a weight ratio of 0.005 to 0.035; the first type of rare earth element includes a mixture of neodymium and yttrium; the neodymium has a weight ratio of 0.023 to 0.025; the yttrium has a weight ratio of 0.005 to 0.

01. The copper tube also includes a second type of rare earth element, which has a weight ratio of 0.005 to 0.02 and includes lanthanum.

2. The copper tube according to claim 1, characterized in that, The copper tube also includes phosphorus; the phosphorus is present in a weight fraction of less than 0.

003.

3. The copper tube according to claim 1, characterized in that, The total weight percentage of the first type of rare earth elements and the second type of rare earth elements is less than 0.

05.

4. The copper tube according to claim 1, characterized in that, When the first type of rare earth element includes a mixture of neodymium and yttrium, the copper tube comprises one of the following: 0.016 parts by weight of lanthanum, 0.023 parts by weight of neodymium and 0.009 parts by weight of yttrium; 0.02 parts by weight of lanthanum, 0.025 parts by weight of neodymium and 0.01 parts by weight of yttrium.

5. The copper tube according to claim 1, characterized in that, The diameter of the copper tube is 4.9 mm to 5.05 mm.

6. The copper tube according to claim 1 or 5, characterized in that, The copper tube is provided with an internal thread, and the internal thread has a helix angle.

7. The copper tube according to claim 6, characterized in that, The helix angle ranges from 18 to 25 degrees.

8. The copper tube according to claim 6, characterized in that, The internal thread is formed by alternating grooves and racks. The cross-section of the rack is a triangle with an arc at the top, and the grooves between adjacent racks are in the shape of an inverted trapezoid.

9. The copper tube according to claim 8, characterized in that, The thickness between the bottom of the groove and the outer diameter of the copper tube is 0.18 mm to 0.21 mm.

10. The copper tube according to claim 8, characterized in that, The width of the bottom of the rack is the tooth base width, the width of the bottom of the tooth groove is the tooth groove width, and the ratio of the tooth base width to the tooth groove width is 0.6 to 0.

85.

11. A heat exchanger, characterized in that, include: Multiple fins, the multiple fins being arranged side by side; A heat pipe, wherein the heat pipe is disposed in the plurality of fins, and at least a portion thereof is a copper pipe as described in any one of claims 1 to 10.

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