Copper tube with micro-grooves on inner wall for heat transfer enhancement

Abstract

The utility model provides a kind of copper pipe of inner wall micro-groove heat transfer strengthening, belong to copper pipe technical field, it is mainly aimed at the problem that the existing air conditioner copper pipe inner wall is easy to form laminar boundary layer and pipe inner cold medium is easy to produce laminar flow to influence heat exchange efficiency, including copper pipe body, copper pipe body includes spoiler section and two groups of spiral section, spoiler section inner wall is provided with multiple groups of protrusions, spoiler section both ends are provided with fixed ring and connecting frame, rotating rod is set between two groups of connecting frames, rotating rod is provided with multiple groups of spoiler blades, two groups of spiral section inner wall are all provided with micro-groove, two groups of micro-groove are all distributed along spiral section inner wall spiral, by the setting of micro-groove and protrusion, disturb fluid layer close to copper pipe inner wall, inhibit the generation and expansion of laminar boundary layer, when cold medium flows through spoiler section, drive spoiler blade and rotating rod rotation, the rotation of spoiler blade can destroy the laminar flow of cold medium, to improve the heat exchange efficiency of cold medium and copper pipe body.

Description

Technical Field

[0001] This utility model relates to the field of copper tube technology, and more specifically, to a copper tube with microgrooves on the inner wall to enhance heat transfer. Background Technology

[0002] In refrigeration and air conditioning, copper tubes have long been used as the core heat transfer element in the evaporator and condenser of the refrigerant circulation loop due to their excellent thermal conductivity, ductility and corrosion resistance. When these devices are running, the refrigerant flows inside the copper tube and exchanges heat with the air or water outside the tube. Its heat transfer efficiency directly affects the overall energy efficiency and operating economy of the system. However, traditional smooth-walled copper tubes have heat transfer bottlenecks in practical applications, mainly manifested in the easy formation of a laminar boundary layer on the inner wall of the copper tube and the easy generation of laminar flow of the cold medium inside the tube, which affects the heat exchange efficiency.

[0003] On the one hand, when the low-temperature refrigerant flows through the inner wall of the copper pipe, due to the inherent viscosity of the fluid, the refrigerant molecules that are close to the pipe wall will have their flow velocity reduced sharply due to wall friction, forming a nearly static fluid thin layer, namely the laminar boundary layer. This layer of fluid has extremely weak fluidity, and its thermal resistance is much higher than the convective thermal resistance of the pipe wall itself or the turbulent core region, which hinders the efficient transfer of heat from the pipe wall to the refrigerant working fluid. Especially under low flow rate or low velocity conditions, the boundary layer thickness increases, and the thermal resistance effect becomes more prominent.

[0004] On the other hand, the flow of refrigerant in conventional smooth copper tubes is often in a laminar or low Reynolds number transitional state. Fluid particles move in layers along parallel streamlines, and there is a lack of effective radial mixing between the layers. This orderly but low-energy flow pattern restricts the heat exchange between fluid layers with uneven temperature distribution. The high-temperature fluid layer is difficult to mix fully with the low-temperature layer, so heat cannot diffuse rapidly from the tube wall to the flow core region. The temperature gradient of the entire cross section increases, and the effective heat exchange area is weakened.

[0005] Therefore, existing copper tubes need improvement in terms of laminar boundary layer control and cold medium flow conditions. Utility Model Content

[0006] To address the aforementioned technical problems, this invention provides a copper tube with microgrooves on the inner wall to enhance heat transfer. This solves the technical problems in the prior art where a laminar boundary layer easily forms on the inner wall of traditional air conditioning copper tubes and the cold medium inside the tube easily generates laminar flow, affecting heat exchange efficiency.

[0007] The purpose and effect of this utility model of a copper tube with microgrooves on the inner wall to enhance heat transfer are achieved by the following specific technical means:

[0008] A copper tube with enhanced heat transfer through microgrooves on its inner wall includes a copper tube body, wherein the copper tube body includes a turbulence section and two sets of spiral sections, the two sets of spiral sections being respectively disposed at both ends of the turbulence section;

[0009] The inner wall of the turbulence section is provided with multiple sets of protrusions, and both ends of the turbulence section are provided with fixing rings. Each of the two sets of fixing rings is fixedly connected with a connecting frame. A rotating rod is provided between the two sets of connecting frames, and multiple sets of turbulence blades are provided on the rotating rod.

[0010] Both sets of spiral segments have microgrooves on their inner walls, and both sets of microgrooves are distributed in a spiral shape along the inner wall of the spiral segment.

[0011] According to a preferred embodiment, each of the two sets of connecting frames is fixedly connected to a mounting base, and each of the two sets of mounting bases is equipped with a bearing.

[0012] According to a preferred embodiment, both ends of the rotating rod are respectively connected to two sets of bearings;

[0013] Multiple sets of the aforementioned baffles are fixedly connected to the outer wall of the rotating rod. The multiple sets of the aforementioned baffles are spiral-shaped and are distributed at intervals along the outer wall of the rotating rod.

[0014] According to a preferred embodiment, both sets of fixed ring circumferential sides are detachably connected to the turbulence section.

[0015] According to a preferred embodiment, the plurality of protrusions are arranged in five staggered rows along the inner wall of the turbulence section, and the plurality of protrusions are all hemispherical.

[0016] According to a preferred embodiment, both sets of connecting frames have multiple sets of perforated holes.

[0017] According to a preferred embodiment, the outer diameter of the copper tube body is 6.2-6.6 mm.

[0018] Based on the above aspects, this utility model has the following beneficial effects:

[0019] First, when the cold medium inside the copper tube flows through the microgrooves, the fluid is forced to follow the spiral trajectory of the grooves, generating a strong secondary flow that effectively scours the wall surface, thereby inhibiting the generation and expansion of the laminar boundary layer and making the heat exchange between the cold medium and the tube wall more uniform. The protrusions in the turbulence section can disrupt the fluid layer flowing close to the inner wall of the copper tube, further inhibiting the generation of the laminar boundary layer. At the same time, the microgrooves and protrusions increase the heat exchange area between the inner wall of the copper tube and the cold medium, improving the heat exchange efficiency of the copper tube.

[0020] Secondly, when the cold medium inside the copper tube flows through the turbulence section, it will drive the turbulence blades and the rotating rod to rotate. Since the rotating rod is connected to bearings at both ends, the rotating rod and the turbulence blades can rotate smoothly. The rotation of the turbulence blades will disrupt the laminar flow of the cold medium in the central area of ​​the copper tube body, promote turbulence of the cold medium, and enhance the heat exchange between the central area of ​​the cold medium and the area near the inner wall of the copper tube body, thereby improving the heat exchange efficiency between the cold medium and the copper tube body. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided in an embodiment of this utility model.

[0022] Figure 2 This is an exploded view of a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided in an embodiment of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of a turbulence blade in a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided by an embodiment of this utility model.

[0024] Figure 4 yes Figure 3 Enlarged view of region a in the middle;

[0025] Figure 5 This is a cross-sectional view of a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided in an embodiment of this utility model.

[0026] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0027] 100. Turbine section; 101. Spiral section; 102. Protrusion; 103. Fixing ring; 104. Connecting frame; 105. Rotating rod; 106. Turbine blade; 107. Microgroove; 108. Mounting base; 109. Bearing; 110. Hole. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the structure of a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided in an embodiment of this utility model. Figure 2 This is an exploded view of a copper tube with enhanced heat transfer through microgrooves on the inner wall, provided in an embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of a turbulence-reducing blade in a copper tube with microgrooves on the inner wall to enhance heat transfer, provided by an embodiment of this utility model. Figure 4 yes Figure 3 Enlarged view of region a in the middle. Figure 5 This is a cross-sectional view of a copper tube with enhanced heat transfer through internal wall microgrooves provided in an embodiment of this utility model. The following is a detailed description of this copper tube with enhanced heat transfer through internal wall microgrooves.

[0029] A copper tube with enhanced heat transfer through microgrooves on the inner wall includes a copper tube body with an outer diameter of 6.2-6.6 mm. The copper tube body includes a turbulence section 100 and two sets of spiral sections 101, which are respectively disposed at both ends of the turbulence section 100.

[0030] The inner wall of the turbulence section 100 is provided with multiple sets of protrusions 102. Both ends of the turbulence section 100 are detachably connected to fixed rings 103. The sides of the fixed rings 103 are rounded to reduce the resistance of the fixed rings 103 to the flow of the cooling medium in the copper tube body. Connecting brackets 104 are fixedly connected to both sets of fixed rings 103. Multiple sets of hollow holes 110 are opened on both sets of connecting brackets 104. The hollow holes 110 can reduce the resistance of the connecting brackets 104 to the flow of the cooling medium in the copper tube body. A rotating rod 105 is provided between the two sets of connecting brackets 104. Multiple sets of turbulence blades 106 are provided on the rotating rod 105. The turbulence blades 106 are used to disrupt the laminar flow of the cooling medium in the copper tube body.

[0031] Both sets of spiral segments 101 have microgrooves 107 on their inner walls, and both sets of microgrooves 107 are spirally distributed along the inner wall of the spiral segment 101.

[0032] Understandably, when the cold medium inside the copper tube flows through the microgroove 107, the cold medium is forced to follow the spiral trajectory of the groove, generating a strong secondary flow that continuously disturbs the low-speed fluid layer near the wall, disrupting the conditions for stable boundary layer development and hindering its natural thickening. This makes the heat exchange between the cold medium inside the tube and the tube wall more uniform, thus improving the heat exchange efficiency of the copper tube.

[0033] Mounting bases 108 are fixedly connected to both sets of connecting frames 104, and bearings 109 are installed in both sets of mounting bases 108. The two ends of the rotating rod 105 are connected to the two sets of bearings 109 respectively, so that the rotation of the rotating rod 105 is smoother. The setting of connecting frame 104 and fixing ring 103 ensures the stability of the rotating rod 105 during rotation and improves the reliability of the copper tube during use.

[0034] Multiple sets of turbulence-deflecting blades 106 are fixedly connected to the outer wall of the rotating rod 105. The multiple sets of turbulence-deflecting blades 106 are spiral in shape and are distributed at intervals along the outer wall of the rotating rod 105.

[0035] It should be noted that when the cold medium inside the copper tube flows through the turbulence section 100, since the multiple sets of turbulence blades 106 are all spiral-shaped, the cold medium will drive the turbulence blades 106 and the rotating rod 105 to rotate. Both ends of the rotating rod 105 are connected to the bearings 109, which makes the rotation of the turbulence blades 106 and the rotating rod 105 smoother. The rotation of the turbulence blades 106 will disrupt the laminar flow of the cold medium in the central area of ​​the copper tube body, promote the turbulence of the cold medium in the copper tube body, and enhance the heat exchange between the central area of ​​the cold medium and the area near the inner wall of the copper tube body, thereby improving the heat exchange efficiency between the cold medium and the copper tube body.

[0036] Multiple sets of protrusions 102 are arranged in five staggered rows along the inner wall of the turbulence section 100, and all sets of protrusions 102 are hemispherical.

[0037] Understandably, the protrusion 102 can disrupt the fluid layer flowing close to the inner wall of the copper tube body, further suppressing the generation of the laminar boundary layer. At the same time, the arrangement of the microgroove 107 and the protrusion 102 increases the heat exchange area between the inner wall of the copper tube body and the cold medium, thereby improving the heat exchange efficiency of the copper tube.

[0038] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0039] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A copper tube with enhanced heat transfer via microgrooves on its inner wall, comprising a copper tube body, wherein the copper tube body includes a turbulence section (100) and two sets of spiral sections (101), characterized in that: The two sets of spiral segments (101) are respectively disposed at both ends of the turbulence section (100); The inner wall of the turbulence section (100) is provided with multiple sets of protrusions (102), and both ends of the turbulence section (100) are provided with fixing rings (103). Each of the two sets of fixing rings (103) is fixedly connected with a connecting frame (104). A rotating rod (105) is provided between the two sets of connecting frames (104), and multiple sets of turbulence blades (106) are provided on the rotating rod (105). Both sets of spiral segments (101) have microgrooves (107) on their inner walls, and both sets of microgrooves (107) are spirally distributed along the inner wall of the spiral segment (101).

2. The copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 1, characterized in that: Both sets of connecting frames (104) are fixedly connected to mounting bases (108), and both sets of mounting bases (108) are equipped with bearings (109).

3. The copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 2, characterized in that: The two ends of the rotating rod (105) are respectively connected to two sets of bearings (109); Multiple sets of the baffle blades (106) are fixedly connected to the outer wall of the rotating rod (105). The multiple sets of baffle blades (106) are spiral in shape and are distributed at intervals along the outer wall of the rotating rod (105).

4. The copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 1, characterized in that: Both sets of fixed rings (103) are detachably connected to the turbulence section (100) around their periphery.

5. A copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 1, characterized in that: The multiple sets of protrusions (102) are arranged in five staggered rows along the inner wall of the turbulence section (100), and the multiple sets of protrusions (102) are all hemispherical.

6. The copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 1, characterized in that: Both sets of connecting frames (104) have multiple sets of perforated holes (110).

7. The copper tube with enhanced heat transfer via microgrooves on the inner wall as described in claim 1, characterized in that: The outer diameter of the copper tube body is 6.2-6.6 mm.

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