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1、 Copper and aluminum (or aluminum and steel) composite column radiator Airfoil Technology Abstract The copper and aluminum (or aluminum and steel) composite wing radiator is a column within the copper (or steel) outside the new aluminum radiator, its capacity of water, parts of copper (or steel) pip
2、e, pipe outside the cooling components for the aluminum alloy wing tube. It is fully engaged in their own different metal materials, corrosion, or ease of processing advantages of forming, etc., can satisfy our requirements of modern architecture on the radiator. This article related to the heat sin
3、k to make a study technical issues, the basic structure of products and technical features to make the necessary analysis, and engineering to make the necessary selection of the main points set out, for the engineering design of the product selection and product development to provide some reference
4、. Keywords: copper and aluminum composite wing column radiator 1 Overview China is a vast and populous developing country, the task of building a huge, annual needs of about 300 million heating radiator, has the worlds unique huge market. For decades, Chinas radiator has made great progress in produ
5、ction has changed the dominance of cast-iron radiators. However, due to Chinas development process, some limitations of their own conditions, although the heating heat medium in the implementation of the centralized hot water heating, but the heat medium itself, water quality, oxygen content and wat
6、er loss (overtime pay) the amount is difficult to effectively control, thermal coal is a high oxygen content of water leading to corrosion of steel radiator major factor, of course, materials, processing, and maintenance reasons. With thin steel plate as the raw material produced the most serious co
7、rrosion problems radiator. Any subsequent aluminum radiator, although a strong ability to engage in oxygen corrosion, but poor corrosion resistance sensibility, suitable for Ph = 5 8.5 used in heating water. However, water quality mostly depends on the steel heating boiler water quality standards, P
8、h = 10 12 (heat exchanger system, the water Ph = 8.5). Therefore, in previous years, the alkaline corrosion of aluminum radiator exposed a serious problem, leading to the market is back to cast iron radiator-based situation. That is, age is advancing, with the building standards and raise the level
9、of the corresponding require to adapt to supporting construction equipment, as well as heating by the welfare system to enter the market and become a commodity, while raising the level of measurement and control of neckties at a much more sophisticated equipment and instrumentation, these are the pr
10、oduction of cavity sticky sand cast iron radiators too difficult to adapt to. Based on the above, copper and aluminum (or aluminum and steel) radiator came into being, its basic structural forms, one horizontal structure of copper tube aluminum convection radiator, there are bar, box-shaped and non-
11、jacket of the closed - Fold in three forms; the other is the vertical column airfoil structure to brass (or steel) to allow the water components, while the aluminum wing tube is a combination of copper and aluminum heat sink (or aluminum and steel) composite column wing radiator. The latter with its
12、 safe and reliable, thin and light after the advent of the new U.S. stance is very compelling, and in their own potential, and is expected to become the new century, the development of our country in the amount of new varieties has become the representation of products with Chinese characteristics.
13、2 copper and aluminum (or aluminum and steel) composite column radiator airfoil and technical analysis of the basic structure 2.1 Basic Construction Shown in Figure 1: 1,2, respectively, on the second line boxes, for larger diameter thin-walled copper pipe or standard pipe (according to nozzle size
14、selection of welding required, G3 / 4 diameter outlet box when the Alliance may choose DN40), were welded into the ends, outlet pipe mouth (5,6) (outlet pipe thread tends to be used within the G3 / 4, also has G1) and exhaust valve seat (7);. To pass the water riser for a smaller diameter thin-walle
15、d copper pipe or standard pipe (generally DN15 25), its upper and lower ends, respectively, under, on the second line box (1,2) welding; 4 for aluminum heat wing tube, and the riser (3) Set after the expansion joint, to the two closely integrated to ensure good heat transfer. A group of the number o
16、f radiator columns calling for a decision according to orders. After welding by pressure test, surface treatment (painting or spray), and packaged factory. Figure 1 Schematic structure As can be seen from Figure 1, the water volume of the product components as 1,2,3 (master piece), and 5,6,7 (access
17、ories), when the structure of these components for both copper and aluminum bronze; as for steel and aluminum structure, these parts corresponding to steel (carbon steel or stainless steel) 2.2 Technical Analysis 2.2.1 corrosion resistance: At present, the basic requirements of life on the radiator
18、is equivalent to the heating system used in the life of welded steel pipes. For copper and aluminum radiator structure, since the water capacity are all components of copper, its corrosion resistance is much higher than steel, can adapt to the common types of heating the water quality requirements,
19、according to GB50050-95 “industrial cooling water treatment design specifications “requirement,” the annual corrosion rate of carbon steel wall should be less than 0.125mm / a, copper, copper alloy and stainless steel wall of the annual corrosion rate should be less than 0.005 mm / a “, can be seen,
20、 copper Pipe corrosion rate of carbon steel tube 25 times, which is a brass wall thickness of 0.5mm length of its corrosion-resistant steel pipe wall thickness that is equivalent to 12.5mm, apparently to meet the useful life of the radiator of the aforementioned requirements. Stainless steel structu
21、re of the radiator can also achieve this effect (see article 4.1). For the steel and aluminum structure of the radiator, its common to use a standard steel pipe welded steel pipe and general two kinds of seamless steel tubes. The former minimum wall thickness of 2.7mm, pipe itself is used in pipe he
22、ating system; the latter may use in the selection of pipe wall thickness of 2.5mm or more, the basic equivalent to ordinary welded steel pipe wall thickness can also be used to ensure radiator seniority requirements. 2.2.2 Carrying Capacity: Due to the capacity of the water of this type of product c
23、omponents (that is, confined parts) are the standard brass or steel, according to the corresponding provisions of national standards, the production tubing used in radiators, its factory test increasing pressure up to 2.0MPa or more (see article section 4.1), while the radiators working pressure is
24、generally set at 1.0 MPa, test pressure 1.5 MPa. So long as it can ensure the welding quality, we can ensure that the entire radiator pressure requirements, can be used safely. 2.2.3 Thermal Performance: The type radiator cooling function was undertaken by the aluminum wing tube, up and down togethe
25、r accounted for less part of the box. Can give full play to the advantages of aluminum alloy extrusion easy, according to modeling of thermal and aesthetic requirements, processing into a variety of beginning and sizes, and then with copper (or steel) riser of the expansion joint to achieve close in
26、tegration, reducing the thermal resistance to ensure good heat transfer. 2.2.4 Usage: The products of the inner and outer smooth surface, internal and will not cause water pollution or heat medium sand is conducive to a high precision equipment and instruments to work; outside can improve product th
27、e extent and grade of aesthetics. Radiator and its width can be greatly reduced. Integrated said that the industry can achieve the “safe and reliable, thin-US new” basic requirements. Reposted elsewhere in the paper for free download 3 aluminum wing tube heat pipe analysis 3.1 The basic requirements
28、: the radiator pipes used in aluminum wing tube, and the existing aluminum radiator basically the same. However, lined with brass (or steel) and tube expander needs, airfoil tube bore (column) can only use round, should not use the rectangle to form a circular string in the form of peripheral fins.
29、Must be lined with a round column tube diameter pipe with a reasonable tolerance, both to ensure there is no difficulty when the string of pipe, but also ensure that the amount of inner tubes tube expander is not much. Average volume of 0.4 0.6mm Expander within the framework of, and make aluminum w
30、ing tube micro-expansion, to closely. Aluminum wing tube cross-section shape and fin set up, we must meet the following basic requirements. 3.1.1 within the diameter circular column to be used with the liner tube (copper or steel) complexes. Section 3.1.2 determines the size of the width of the thic
31、kness of the radiator, from top to bottom should be considered in conjunction with the size of box to ensure the radiator storage, transport, use wing from operating. Wing length of pipe section when the decision to form a radiator spacing (film length), should take into account the convenience and
32、selection of project selection radiator when the heat dissipation with Chip-Level Differential requirements. 3.1.3-wing tube peripheral fin height (specifically, the outer edge to the center fin distance from the wall) Do not too much, to not more than 60mm is appropriate to ensure a reasonable heat
33、 transfer temperature difference (with the best value requires in-depth studies). Number of fins set to fully meet the requirements of enhanced heat transfer to ensure a smooth flow of hot air, as well as cleaning possible. Fin outer end can not be sharp, the best作成”T”-shaped, to prevent the body bu
34、mps. 3.1.4 Fin and central circular column wall thickness should be thin as far as possible in order to save material. Want to fin thickness is 0.5 0.6mm, so that the radiator heat intensity of the metal reached a high level, which is beneficial to future development. 3.2 cross-section shape: tubula
35、r aluminum wing tube, broadly separated type, closed, mixed-type three kinds. Figure 2 shows a schematic of several tube-shaped. “a” as a closed structure, benefits based on the formation of natural convection of air fin channel, using the chimney effect of enhanced effect of heat transfer. “b” for
36、the open structure, the advantage of increased heat transfer area increased by single-column radiator of heat dissipation, but also to achieve a higher thermal strength of the metal to save material. “c” for the hybrid structure. It combines closed and open style of some of the features formed in th
37、e shape, thermal, and all aspects of installation has its own characteristics-wing tube cross-section shape. For the wing tube cross-section size of the control, wing tube cross-section size of the B and thus for the thickness of the radiator, aluminum radiator has been the standard reference to the
38、 requirements, generally 50 60mm; film length L (also equal to 2 piece radiator center distance) values to be considered two combinations gap, and in order to use and installation aspects, any check Integer (cm). Shown in Figure 2: L = L1 C, L1 is the length of the aluminum wing tube cross-section;
39、C as a combination of space, usually 5 10mm. Based on the wing tube processing, thermal, and have a variety of sizes of radiators, film length L more than the 60 100mm range. Aluminum wing tube set high, the main consideration riser (3) and, on the second line box (1,2) welding and air circulation t
40、o facilitate the smooth. Aluminum wing tube upper and lower surfaces at both ends, respectively, on the second line distance from the outer box, generally 10 15mm. Decorative cover for the top of the set of products, decorative hood designed to ensure that thermal requirements, so that airflow fluen
41、t, without reducing the cooling effect. Figure 2 aluminum wing tube-shaped diagram (A) closed; (b) Type; (c) Hybrid 4 copper and aluminum (or aluminum and steel) column radiator pressure airfoil capability and thermal properties 4.1 Strength: As the capacity of this type of radiator water, the major
42、 components are standard copper or steel, corresponding to the time of manufacture of this type commonly used radiator pipe specifications, according to standard requirements of the factory test pressure may be more than the radiator pressure requirements. So, as long as the selected strictly in acc
43、ordance with standard pipe, we can guarantee the radiator pressure capabilities, you can do a good job as long as the quality of welding. Steel and aluminum structure, the modifications used in radiators welded steel pipes, cold-rolled seamless tubes and stainless steel factory air test pressure of
44、Table 1; for copper and aluminum structure products, which they used copper, code-named T2, T3. , On the second line box due to the need for drilling, have to use hard copper tube (indicated by Y): Li-channel semi-rigid copper pipe (as indicated Y2), general supply can be cut to length brass factory
45、. Pipe wall thickness in accordance with predetermined diameter and work pressure according to Table 2 and Table 3 Selected. The technical parameters of several standard steel pipe Table 1 General welded steel pipe Cooling seamless steel pipe Cooled stainless steel seamless pipe DN OD (Mm) Thickness (Mm) Singlet (Kg / m) OD Thickness Singlet OD Thickness Range Radiator wall thickness range of Mm In 10 3 / 8 17.0 2.25 0.82 14 2.0 0.59 15 0.5 3.5 0.5 1.5 15 1 / 2 21.3 2.75 1.26 22 2.5 1.20 17 0.5 4.0 0.5 1.5 20 3 / 4 26.8 2.75 1.63 27 2.5 1.51 22 0.5 4.5 0.5 1.5 25 1 33.5 3.25 2.42