A heat transfer tube
By setting notches and indentations on the spiral trapezoidal teeth of the heat transfer tube, the problem of tooth tip collapse during the expansion process of traditional heat transfer tubes is solved, achieving more efficient refrigerant turbulence and stable heat exchange effect.
Patent Information
- Authority / Receiving Office
- CN ยท China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI GANGLONG METAL CO LTD
- Filing Date
- 2025-09-04
- Publication Date
- 2026-07-31
AI Technical Summary
During the expansion process of traditional internally threaded heat transfer tubes, the tips of the spiral trapezoidal teeth are prone to plastic deformation, leading to collapse, which affects the turbulent flow of the refrigerant and the heat exchange efficiency. Furthermore, existing improvement methods suffer from high processing difficulty or high cost.
Notches and indentations are set at specific locations on the spiral trapezoidal teeth to guide irregular deformation, enhance turbulence, and improve processing stability. Specific measures include setting notches on one side of the spiral trapezoidal teeth near the top, and setting indentations and scratches on the upper end of the notches to control deformation during the tube expansion process.
By designing notches and indentations, the degree of tooth tip collapse is reduced, the effective heat transfer area is maintained, the refrigerant turbulence effect is enhanced, the heat exchange efficiency is improved, and the processing stability is guaranteed.
Smart Images
Figure CN224580792U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of components for general heat exchange or heat transfer equipment, and specifically to a heat transfer tube. Background Technology
[0002] During the expansion process of traditional internally threaded heat transfer tubes, the tips of the spiral trapezoidal teeth are prone to plastic deformation and collapse due to the compression of the core rod. This results in a reduction in tooth height and disruption of the tooth shape's regularity, thereby weakening the turbulent flow effect of the refrigerant and reducing heat exchange efficiency. In addition, conventional improvement methods (such as increasing the tooth tip thickness and optimizing the tube expansion process) have problems such as high processing difficulty, high cost, or unstable results. Utility Model Content
[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model enhances turbulence by setting notches at specific positions on the spiral trapezoidal teeth, dynamically guiding the deformation direction during tube expansion, and utilizing controllable irregular deformation to improve heat transfer efficiency and processing stability. The technical solution adopted includes: A heat transfer tube includes a tube body, the outer wall of which is provided with outer fins, and the inner wall of which is provided with a spirally distributed inner knurling pattern, the inner knurling pattern including spiral trapezoidal teeth, and a notch is provided on one side of the spiral trapezoidal teeth near its top. The technical solution adopted by one embodiment of this utility model to solve its technical problem is: an indentation is provided on the other side of the spiral trapezoidal tooth at the position corresponding to the upper end of the notch.
[0004] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the indentation is V-shaped or U-shaped.
[0005] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the distance between the notch and the tip of the spiral trapezoidal tooth is 1mm, and the depth of the indentation is 0.5mm.
[0006] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the other side of the spiral trapezoidal tooth is provided with scratches corresponding to the position of the notch.
[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the scratches are provided in multiple ways, and the multiple scratches are distributed at intervals along the spiral trapezoidal tooth surface.
[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the distance between the notch and the other side of the spiral trapezoidal tooth is 1mm, and the depth of the scratch is 0.3mm-0.4mm.
[0009] The beneficial effects of this utility model are: the notch causes the corresponding area on the other side of the spiral trapezoidal tooth to collapse preferentially during tube expansion, forming irregular protrusions or wrinkles, reducing the degree of direct collapse of the tooth tip, maintaining the effective heat transfer area, compensating for the impact of the reduction in heat exchange tooth height on the heat exchange effect, and ensuring the turbulent flow effect of the refrigerant. Attached Figure Description
[0010] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the heat transfer tube described in the embodiment of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle. Detailed Implementation
[0011] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0012] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.
[0013] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0014] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0015] Reference Figure 1-2According to an embodiment of this application, the heat transfer tube includes a tube body 10, the outer wall of the tube body 10 is provided with outer fins 20, and the inner wall of the tube body 10 is provided with an inner knurling pattern 30 in a spiral distribution. The inner knurling pattern 30 includes a spiral trapezoidal tooth 31, and a notch 32 is provided on one side of the spiral trapezoidal tooth 31 near its top.
[0016] The notch 32 causes the corresponding area on the other side of the spiral trapezoidal tooth 31 to collapse preferentially during tube expansion, forming irregular protrusions or wrinkles, reducing the degree of direct collapse of the tooth tip, maintaining the effective heat transfer area, compensating for the impact of reduced heat exchange tooth height on heat exchange effect, and ensuring the turbulent flow effect of refrigerant.
[0017] The heat exchange tube is a copper tube with an outer diameter of 200 mm, an outer fin height of 5 mm, and a helix angle of 30ยฐ. The helical trapezoidal tooth 31 has a tooth height of 6 mm and a tooth tip width of 5 mm. The notch 32 is located on the right side of the helical trapezoidal tooth 31. The distance between the top of the notch 32 and the tooth tip is 1 mm. The bottom of the notch extends to 1 / 2 of the tooth height. The distance between the side of the notch 32 and the other side of the helical trapezoidal tooth 31 is 1 mm.
[0018] Preferably, an indentation 33 is provided on the other side of the trapezoidal thread at the position corresponding to the upper end of the notch 32. The indentation 33 serves as a pre-set weak point to guide stress concentration, causing the notch 32 to form a local protrusion or wrinkle on the side of the spiral trapezoidal tooth 31, which enhances turbulence while avoiding excessive deformation; Specifically, the indentation 33 is V-shaped or U-shaped with a depth of 0.5 mm. The indentation 33 is pressed simultaneously during the trapezoidal thread forming process using a rolling die. When the depth is 0.5 mm, the indentation 33 can effectively guide stress concentration, forming a sufficiently strong disturbance structure, while avoiding excessive weakening of the tooth side leading to fracture.
[0019] Preferably, a scratch 34 is provided on the other side of the trapezoidal thread at the position corresponding to the notch 32. After the tube expands, the scratch 34 guides the deformation, causing sharp points or micro-protrusions to form on both sides, which can more effectively disrupt the fluid boundary layer and improve the turbulence effect.
[0020] Specifically, the depth of scratch 34 is 0.2mm-0.4mm, which can form a more concentrated stress path, making deformation controllable.
[0021] Preferably, the scratches 34 are provided in multiple ways, and the multiple scratches 34 are distributed at intervals along the trapezoidal thread tooth surface. Through the spaced scratches 34, multiple disturbance sources are formed on the tooth surface, so that the refrigerant repeatedly undergoes boundary layer destruction and reconstruction during the flow process, continuously enhancing the turbulence effect.
[0022] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.
Claims
1. A heat transfer tube characterized by, Includes a tube body (10), the outer wall of the tube body (10) is provided with outer fins (20), the inner wall of the tube body (10) is provided with an inner knurling pattern (30) in a spiral distribution, the inner knurling pattern (30) includes a spiral trapezoidal tooth (31), and a notch (32) is provided on one side of the spiral trapezoidal tooth (31) near its top.
2. The heat transfer tube of claim 1, wherein The spiral trapezoidal tooth (31) has an indentation (33) at the upper end of the notch (32) on the other side.
3. The heat transfer tube of claim 2, wherein The indentation (33) is V-shaped or U-shaped.
4. The heat transfer tube of claim 3, wherein The distance between the top of the notch (32) and the top of the spiral trapezoidal tooth (31) is 1 mm, and the depth of the indentation (33) is 0.5 mm.
5. The heat transfer tube of claim 1, wherein The spiral trapezoidal tooth (31) has a scratch (34) on the other side corresponding to the notch (32).
6. The heat transfer tube of claim 5, wherein The scratches (34) are provided in multiple places, and the multiple scratches (34) are distributed at intervals along the tooth surface of the spiral trapezoidal teeth (31).
7. The heat transfer tube of claim 5 wherein, The notch (32) is 1 mm away from the other side of the spiral trapezoidal tooth (31), and the depth of the scratch (34) is 0.2 mm to 0.4 mm.