Heat exchanger and air conditioner
By setting protective layer and internal threaded teeth on the heat exchange pipe, the existing heat exchanger has been solved, which has achieved lightweight, reduced costs and improved recyclability, and improved heat exchange performance.
Patent Information
- Application Number
- CN202421589627.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-05
AI Technical Summary
The existing tube fin heat exchangers have heavy mass, poor recyclability and high manufacturing cost because they use copper pipes with good corrosion resistance in the external environment.
The main pipe layer is covered with a protective layer. The cross-sectional area ratio between the main pipe layer and the protective layer is 90:10~98:2. The protective layer is made of zinc-aluminum alloy. An alloy layer is formed by arc thermal spraying technology, etc. The main pipe layer is made of aluminum or aluminum alloy, and the internal threaded teeth are designed to increase the heat exchange area.
It achieves lightweight, reduces manufacturing costs, improves the recyclability and service life of the heat exchanger, and enhances the heat exchange performance.
Smart Images
Figure CN223122023U_ABST
Abstract
Description
Technical Field
[0001] This application relates to, but is not limited to, the technical field of household appliances, and specifically refers to a heat exchanger and an air conditioner. Background Art
[0002] The existing finned tube heat exchanger, also known as the finned tube heat exchanger, includes heat exchange fins and heat exchange tubes passing through the heat exchange fins. The heat exchange tubes usually use copper tubes with good corrosion resistance to the external environment, and the heat exchange fins usually use aluminum foil sheets. This finned tube heat exchanger has poor recyclability, heavy weight, and high manufacturing cost. Summary of the Utility Model
[0003] An embodiment of this application provides a heat exchange tube, including: a main tube layer; and a protective layer located on the outer peripheral surface of the main tube layer, and the ratio of the cross-sectional area of the main tube layer to the cross-sectional area of the protective layer is 90:10 to 98:2.
[0004] In some exemplary embodiments, the thickness of the protective layer is 50 μm to 300 μm.
[0005] In some exemplary embodiments, the protective layer is an alloy layer formed on the outer peripheral surface of the main tube layer by using an arc thermal spraying process, a powder spraying process, a solution coating process, an electroless plating process, or an electroplating process, and the electrode potential of the alloy layer is lower than the electrode potential of the main tube layer.
[0006] In some exemplary embodiments, the material of the protective layer is zinc aluminum alloy.
[0007] In some exemplary embodiments, the material of the main tube layer is aluminum or aluminum alloy.
[0008] In some exemplary embodiments, the outer diameter of the heat exchange tube is 3 mm to 15 mm, and the wall thickness of the heat exchange tube is 0.3 mm to 2 mm.
[0009] In some exemplary embodiments, internal thread teeth are provided on the inner peripheral surface of the main tube layer.
[0010] In some exemplary embodiments, the internal thread teeth are triangular teeth, trapezoidal teeth, high-low teeth, or cross teeth.
[0011] In some exemplary embodiments, the helix angle of the internal thread teeth is 10 degrees to 30 degrees, the tooth tip angle of the internal thread teeth is 15 degrees to 60 degrees, the tooth height of the internal thread teeth is 0.05 mm to 0.5 mm, and the number of the internal thread teeth is 35 to 60.
[0012] An embodiment of this application also provides a heat exchanger, including heat exchange fins and the heat exchange tube according to any one of the above embodiments, and the heat exchange tube passes through the heat exchange fins and is in interference fit with the heat exchange fins.
[0013] The embodiment of the present application also provides an air conditioner, including the heat exchanger described in any of the above embodiments.
[0014] For the heat exchange tube provided by the embodiment of the present application, the protective layer is provided on the outer peripheral surface of the main pipe layer, and the ratio of the cross-sectional area of the main pipe layer to the cross-sectional area of the protective layer is 90:10 to 98:2. The main pipe layer and the external environment are isolated by the protective layer with a certain thickness, so as to protect the main pipe layer for a long time and prevent the main pipe layer from being corroded and damaged by the external environment during use. In this solution, the material of the main pipe layer can be aluminum or aluminum alloy with poor corrosion resistance to the external environment and low price. In this way, the heat exchange tube is not only lighter in weight but also lower in manufacturing cost.
[0015] Furthermore, the heat exchange tube is applied to a heat exchanger, and the heat exchange fins of the heat exchanger are made of aluminum foil, so that the recyclability of the heat exchanger is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a three-dimensional structural schematic diagram of a heat exchange tube in some embodiments of the present application;
[0017] Figure 2 is Figure 1 a schematic cross-sectional view of the front view structure of the heat exchange tube shown;
[0018] Figure 3 is Figure 1 a schematic cross-sectional view of the left view structure of the heat exchange tube shown.
[0019] In the drawings, the list of components represented by each reference numeral is as follows:
[0020] 200 main pipe layer, 210 internal thread teeth, 300 protective layer. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The principles and features of the present application will be described below with reference to the accompanying drawings. The examples given are only for explaining the present application and are not intended to limit the scope of the present application.
[0022] The air conditioner provided by the embodiment of the present application includes a heat exchanger. The heat exchanger includes heat exchange fins and a heat exchange tube. The heat exchange tube passes through the heat exchange fins and is in interference fit with the heat exchange fins. The heat exchange tube includes: a main pipe layer 200; and a protective layer 300. The protective layer 300 is located on the outer peripheral surface of the main pipe layer 200, and the ratio of the cross-sectional area of the main pipe layer 200 to the cross-sectional area of the protective layer 300 is 90:10 to 98:2. Among them, the cross-section of the heat exchange tube is perpendicular to the axis of the heat exchange tube.
[0023] The protective layer 300 is disposed on the outer peripheral surface of the main pipe layer 200, and the ratio of the cross-sectional area of the main pipe layer 200 to the cross-sectional area of the protective layer 300 is 90:10 to 98:2. The main pipe layer 200 and the external environment are isolated by the protective layer 300 with a certain thickness, so as to provide long-term protection for the main pipe layer 200 and prevent the main pipe layer 200 from being corroded and damaged by the external environment during use. In this solution, the material of the main pipe layer 200 can be aluminum or aluminum alloy with poor corrosion resistance to the external environment and low price. In this way, the heat exchange tube is not only lighter in weight but also lower in manufacturing cost. The heat exchange tube is applied to a heat exchanger, and the heat exchange fins of the heat exchanger are made of aluminum foil, so that the heat exchanger has better recyclability.
[0024] It can be that the ratio of the cross-sectional area of the main pipe layer 200 to the cross-sectional area of the protective layer 300 is 90:10; or it can be that the ratio of the cross-sectional area of the main pipe layer 200 to the cross-sectional area of the protective layer 300 is 95:5; or it can be that the ratio of the cross-sectional area of the main pipe layer 200 to the cross-sectional area of the protective layer 300 is 98:2, etc.; the above can all achieve the purpose of this application, and its gist does not deviate from the design idea of the present utility model, so it will not be elaborated here and should all fall within the protection scope of this application.
[0025] Among them, the thickness of the protective layer 300 is set to 50μm to 300μm, so that the protective layer 300 can better provide long-term protection for the main pipe layer 200.
[0026] It can be that the thickness of the protective layer 300 is set to 50μm; or it can be that the thickness of the protective layer 300 is set to 175μm; or it can be that the thickness of the protective layer 300 is set to 300μm, etc.; the above can all achieve the purpose of this application, and its gist does not deviate from the design idea of the present utility model, so it will not be elaborated here and should all fall within the protection scope of this application.
[0027] In some examples, the protective layer 300 is an alloy layer made on the outer peripheral surface of the main pipe layer 200 by using arc thermal spraying process, powder spraying process, solution coating process, electroless plating process or electroplating process. The above process technologies for making the alloy layer are mature and the made alloy layer has good uniformity. The electrode potential of the alloy layer is lower than that of the main pipe layer 200, and the alloy layer is a sacrificial anode protective layer relative to the main pipe layer 200, so that the salt spray test performance of the heat exchange tube can be improved.
[0028] The joint surface of the main pipe layer 200 and the protective layer 300 is metallurgically bonded, has good mechanical properties, and can be used for processing such as expansion joint, tube expansion, tube bending, and upsetting of the heat exchange tube, and the phenomenon of separation and cracking between the main pipe layer 200 and the protective layer 300 will not occur. Among them, the heat exchange tube is connected with the heat exchange fins in an interference fit by using an expansion joint process, and this process is simple and easy to operate.
[0029] In some examples, the material of the protective layer 300 is zinc aluminum alloy, which has better resistance to atmospheric corrosion and salt spray corrosion. The material of the main pipe layer 200 is aluminum or aluminum alloy, which is light in weight, low in cost and good in recyclability. Using zinc aluminum alloy as the sacrificial anode and closely covering the outer surface of the main pipe layer 200 provides excellent corrosion protection for the main pipe layer 200; compared with a heat exchanger with an aluminum heat exchange tube, the heat exchanger using the heat exchange tube of the present application has a longer service life.
[0030] Among them, the protective layer 300 formed by zinc aluminum alloy undergoes uniform planar corrosion, while aluminum or aluminum alloy undergoes perforation corrosion (i.e., pitting corrosion). When using the heat exchange tube of the present application in an external corrosion environment, the sacrificial anode zinc aluminum alloy as the protective layer 300 will first undergo uniform corrosion under the electrochemical reaction. Theoretically, when the protective layer 300 is corroded completely, the main pipe layer 200 with a relatively higher electrode potential can be corroded. This solution can prevent the heat exchange tube from generating through-corrosion holes along the wall thickness direction in a short time. And when the protective layer 300 is completely corroded and the main pipe layer 200 begins to corrode, the air conditioner equipped with this heat exchanger has already far exceeded its designed service life.
[0031] In some examples, the outer diameter of the heat exchange tube is 3 mm to 15 mm, and the wall thickness of the heat exchange tube is 0.3 mm to 2 mm. The heat exchange tube with a smaller wall thickness can better meet the heat exchange efficiency of the heat exchanger, and compared with an existing heat exchanger with a copper heat exchange tube, the heat exchanger using the heat exchange tube of the present application has a lower manufacturing cost.
[0032] It can be that the outer diameter of the heat exchange tube is 3 mm; or it can be that the outer diameter of the heat exchange tube is 9 mm; or it can be that the outer diameter of the heat exchange tube is 12 mm, etc.; it can be that the wall thickness of the heat exchange tube is 0.3 mm; or it can be that the wall thickness of the heat exchange tube is 1.2 mm; or it can be that the wall thickness of the heat exchange tube is 2 mm, etc.; the above can all achieve the purpose of the present application, and its gist does not deviate from the design concept of the present utility model, so it will not be elaborated here and all should fall within the protection scope of the present application.
[0033] In some examples, internal thread teeth 210 are provided on the inner peripheral surface of the main pipe layer 200, and the internal thread teeth 210 increase the area of the inner surface of the heat exchange tube, thereby improving the heat exchange performance of the heat exchange tube.
[0034] It can be that the internal thread teeth 210 are made by machining (such as extrusion or spinning) on the inner surface of the main pipe layer; or it can be that the internal thread teeth 210 are integrally formed with the main pipe layer during the casting of the heat exchange tube, etc.; the above can all achieve the purpose of the present application, and its gist does not deviate from the design concept of the present utility model, so it will not be elaborated here and all should fall within the protection scope of the present application.
[0035] In some examples, the internal thread teeth 210 are one or more of triangular teeth, trapezoidal teeth, high-low teeth, or cross teeth, all of which can achieve the purpose of this application. The gist thereof does not depart from the design concept of the present utility model, and will not be elaborated herein, and all should fall within the protection scope of this application.
[0036] In some examples, the helix angle of the internal thread teeth 210 is from 10 degrees to 30 degrees. The helix angle refers to the included angle between the inclination direction of the internal thread teeth 210 and the axis direction of the heat exchange tube. The helix angle enables the refrigerant to be guided and travel along the spiral direction.
[0037] In this solution, a part of the fluid in the heat exchange tube flows along the axis of the heat exchange tube, and another part flows along the spiral direction of the internal thread teeth 210. This solution increases the turbulence intensity of the fluid in the heat exchange tube, so that the convective heat transfer effect of the refrigerant in the evaporation condition and condensation condition of the air conditioner is enhanced, and the heat transfer performance of the heat exchange tube will be further improved. Among them, there are multiple heat exchange tubes, and there are also multiple heat exchange fins. Each heat exchange tube is disposed through multiple heat exchange fins. The heat exchanger includes at least one of an indoor heat exchanger and an outdoor heat exchanger.
[0038] It can be that the helix angle of the internal thread teeth 210 is 10 degrees; or it can be that the helix angle of the internal thread teeth 210 is 20 degrees; or it can be that the helix angle of the internal thread teeth 210 is 30 degrees, etc.; the above can all achieve the purpose of this application. The gist thereof does not depart from the design concept of the present utility model, and will not be elaborated herein, and all should fall within the protection scope of this application.
[0039] In some examples, the tooth apex angle α of the internal thread teeth 210 is from 15 degrees to 60 degrees, so that the heat transfer performance of the heat exchange tube is better. At this time, the cross-section of the internal thread teeth 210 can be trapezoidal or triangular, which is easy to manufacture.
[0040] Among them, the tooth apex angle α of the internal thread teeth 210 is the included angle between two sides of the internal thread teeth 210. It can be that the tooth apex angle α of the internal thread teeth 210 is 15 degrees; or it can be that the tooth apex angle α of the internal thread teeth 210 is 30 degrees; or it can be that the tooth apex angle α of the internal thread teeth 210 is 45 degrees; or it can be that the tooth apex angle α of the internal thread teeth 210 is 60 degrees, etc.; the above can all achieve the purpose of this application. The gist thereof does not depart from the design concept of the present utility model, and will not be elaborated herein, and all should fall within the protection scope of this application.
[0041] In some examples, the tooth height h of the internal thread teeth 210 is from 0.05 mm to 0.5 mm. The tooth height h is the distance from the tooth top to the tooth root of the internal thread teeth 210. When the tooth height h is relatively large, the contact area between the refrigerant and the heat exchange tube can be increased, thereby improving the heat transfer effect.
[0042] It can be that the tooth height h of the internal thread teeth 210 is 0.05 mm; or it can be that the tooth height h of the internal thread teeth 210 is 0.1 mm; or it can be that the tooth height h of the internal thread teeth 210 is 0.2 mm; or it can be that the tooth height h of the internal thread teeth 210 is 0.3 mm; or it can be that the tooth height h of the internal thread teeth 210 is 0.4 mm; or it can be that the tooth height h of the internal thread teeth 210 is 0.5 mm, etc.; the above can all achieve the purpose of this application, and its gist does not deviate from the design concept of the present utility model, so it will not be elaborated here and all should fall within the protection scope of this application.
[0043] In some examples, the number of the internal thread teeth 210 is 35 to 60. It can be that the number of the internal thread teeth 210 is 35; or it can be that the number of the internal thread teeth 210 is 40; or it can be that the number of the internal thread teeth 210 is 45; or it can be that the number of the internal thread teeth 210 is 50; or it can be that the number of the internal thread teeth 210 is 55; or it can be that the number of the internal thread teeth 210 is 60, etc.; the above can all achieve the purpose of this application, and its gist does not deviate from the design concept of the present utility model, so it will not be elaborated here and all should fall within the protection scope of this application.
[0044] In some examples, the density of the heat exchange tube is 16 g / m to 22 g / m, so that the weight of the heat exchange tube is relatively small. It can be that the density of the heat exchange tube is 16 g / m; or it can be that the density of the heat exchange tube is 19 g / m; or it can be that the density of the heat exchange tube is 22 g / m, etc.; the above can all achieve the purpose of this application, and its gist does not deviate from the design concept of the present utility model, so it will not be elaborated here and all should fall within the protection scope of this application.
[0045] In an embodiment, the density of the heat exchange tube is 18.5 g / m. Compared with the heat exchange tube with a density of 32.5 g / m and a material of copper, the weight of the heat exchange tube of this application is approximately reduced by 43%, achieving the light weight and low cost of the heat exchanger.
[0046] In summary, for the heat exchange tube provided by the embodiment of this application, the protective layer is arranged on the outer peripheral surface of the main pipe layer, and the ratio of the cross-sectional area of the main pipe layer to the cross-sectional area of the protective layer is 90:10 to 98:2. The main pipe layer and the external environment are isolated by the protective layer with a certain thickness, so as to protect the main pipe layer for a long time and prevent the main pipe layer from being corroded and damaged by the external environment during use. The material of the main pipe layer in this solution can be aluminum or aluminum alloy, etc. with poor corrosion resistance to the external environment and low price. In this way, the heat exchange tube is not only lighter in weight, but also lower in manufacturing cost.
[0047] Furthermore, the heat exchange tube is applied to a heat exchanger, and the heat exchange fins of the heat exchanger adopt aluminum foil sheets, so that the recyclability of the heat exchanger is better.
[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.
[0050] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0051] In the present application, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0052] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0053] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0054] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A heat exchanger, characterized in that, It includes heat exchange fins and heat exchange tubes, and the heat exchange tubes are composed of a main pipe layer and a protective layer; the heat exchange tubes are inserted through the heat exchange fins and are in interference fit with the heat exchange fins; The heat exchange fins are made of aluminum foil sheets; The material of the main pipe layer is aluminum or aluminum alloy; The material of the protective layer is zinc aluminum alloy; The protective layer is located on the outer peripheral surface of the main pipe layer, and the ratio of the cross-sectional area of the main pipe layer to the cross-sectional area of the protective layer is 90:10 to 98:2; Among them, the protective layer is an alloy layer made on the outer peripheral surface of the main pipe layer by using an arc thermal spraying process, a powder spraying process, a solution coating process, an electroless plating process or an electroplating process; The density of the heat exchange tube is 16 g / m to 22 g / m.
2. The heat exchanger according to claim 1, characterized in that, The thickness of the protective layer is 50 μm to 300 μm.
3. The heat exchanger according to claim 1, characterized in that, The outer diameter of the heat exchange tube is 3 mm to 15 mm, and the wall thickness of the heat exchange tube is 0.3 mm to 2 mm.
4. The heat exchanger according to any one of claims 1 to 3, characterized in that, Internal thread teeth are provided on the inner peripheral surface of the main pipe layer.
5. The heat exchanger according to claim 4, wherein The helix angle of the internal thread teeth is 10 degrees to 30 degrees, the tooth tip angle of the internal thread teeth is 15 degrees to 60 degrees, the tooth height of the internal thread teeth is 0.05 mm to 0.5 mm, and the number of the internal thread teeth is 35 to 60.
6. An air conditioner, characterized in that, It includes a heat exchanger according to any one of claims 1 to 5.