Inclined convex-concave reinforced direct air-cooling heat exchanger finned tube
By setting obliquely convex and concave heat exchange ribs on both sides of the air-cooled heat exchanger fins, the problem of small fin surface contact area is solved, and efficient heat exchange between the fins and the fluid is achieved.
Patent Information
- Application Number
- CN202423314945.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The fin surface of existing air-cooled heat exchangers has a small contact area with the fluid, resulting in poor heat exchange performance.
Design a finned tube for a direct air-cooled heat exchanger with oblique convex-concave reinforcement. Multiple heat exchange ribs are arranged on both sides of the fins, and the included angle α between the ribs and the third direction is less than 50° to increase the contact area between the fin surface and the fluid.
The inclined heat exchange fins significantly improve the contact area between the fin surface and the fluid, as well as the heat exchange effect.
Smart Images
Figure CN223649778U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange equipment technology, specifically to a finned tube for a direct air-cooled heat exchanger with oblique convex-concave reinforcement. Background Technology
[0002] Wet-cooled power generation technology consumes a large amount of primary energy and water resources. Therefore, air-cooled technology, which is water-saving, has emerged. Because air-cooled heat exchangers have the advantage of water conservation, they are well-suited to my country's water-scarce national conditions and thus have a promising market prospect.
[0003] Currently, most air-cooled heat exchangers use flat base tubes with brazed aluminum fins. The fins used on the fin side are straight or corrugated, which results in a small contact area between the fin surface and the fluid, affecting the heat exchange effect. Utility Model Content
[0004] The purpose of this invention is to provide a finned tube for a direct air-cooled heat exchanger with oblique convex and concave reinforcement, in order to solve the problem in the above-mentioned finned tubes with flat base tubes and brazed aluminum fins, where the fin surface has a small contact area with the fluid and the heat exchange effect is poor.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A finned tube for a direct air-cooled heat exchanger with oblique convex-concave reinforcement includes: a flat base tube and a fin assembly. The flat base tube extends along a first direction and has a first plane and a second plane arranged and opposite to each other along a second direction. The fin assembly is respectively disposed on the first plane and the second plane. The fin assembly includes a plurality of fins arranged along the first direction, each fin being perpendicular to the first direction and parallel to the second direction. At least a portion of the fins are provided with a plurality of heat exchange ribs arranged along a third direction on both sides along the first direction. The included angle α between the heat exchange ribs and the third direction is less than 50°, and the first direction, the second direction, and the third direction are perpendicular to each other.
[0007] Furthermore, on the same fin, the pitch S between two adjacent heat exchange fins remains constant.
[0008] Furthermore, the pitch S ranges from 4.6 mm to 15 mm.
[0009] Furthermore, on the same fin, the included angle α between the heat exchange rib and the first direction remains constant, and the included angle α ranges from 20° to 40°.
[0010] Furthermore, the heat exchange ribs are oblique in shape, and the inclination direction of the heat exchange ribs located on the first plane is the same as or opposite to the inclination direction of the heat exchange ribs located on the second plane.
[0011] Furthermore, the heat exchange ribs are symmetrically provided with a first slope and a second slope along their center line. The highest sections of the first slope and the second slope are connected at the center line of the heat exchange ribs to form a peak, and the lowest sections of the first slope and the second slope respectively form a trough.
[0012] Furthermore, the heat exchange rib is zigzag-shaped, and the heat exchange rib includes a first inclined section and a second inclined section. One end of the first inclined section and one end of the second inclined section gradually approach each other, and the other end of the first inclined section and the other end of the second inclined section gradually move away from each other. The included angle α between the first inclined section and the second inclined section and a third direction is both <50°, and the included angle β between the first inclined section and the second inclined section is <90°.
[0013] Furthermore, both the first inclined segment and the second inclined segment include a first slope and a second slope. The highest segment of the first slope and the highest segment of the second slope are connected to form a peak, and the lowest segment of the first slope and the lowest segment of the second slope respectively form a trough.
[0014] Furthermore, the flat base tube has a cross-sectional length f of 209mm to 219mm, a cross-sectional width a of 16mm to 20mm, and a thickness c of 1mm to 1.5mm.
[0015] Furthermore, the length e of the fins arranged along the cross-section of the flat base tube is 160-200 mm, the height d of the fins arranged along the cross-section of the flat base tube is 16 mm-20 mm, the spacing Z between two adjacent fins is 2.3 mm-3 mm, and the thickness of the fins is 0.2 mm-0.3 mm.
[0016] This invention has the following advantages over the prior art:
[0017] 1. The obliquely reinforced direct air-cooled heat exchanger finned tube of this utility model has multiple heat exchange ribs arranged on both sides of the fins along the first direction, and the included angle α between the heat exchange ribs and the third direction is less than 50°. By the heat exchange ribs arranged obliquely on both sides of the fins, the contact area between the fin surface and the fluid can be effectively increased, thereby improving the heat exchange effect. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the obliquely reinforced direct air-cooled heat exchanger finned tube in Embodiment 1 of this utility model;
[0019] Figure 2 for Figure 1 A schematic diagram of the cross-section along direction A;
[0020] Figure 3This is a schematic diagram of the heat exchange rib arrangement in Embodiment 1 of this utility model;
[0021] Figure 4 for Figure 3 Cross-sectional view of the heat exchange rib along its centerline;
[0022] Figure 5 This is a schematic diagram of the cross-section of the flat base tube in Embodiment 2 of this utility model;
[0023] Figure 6 This is a schematic diagram of the cross-section of the flat base tube in Embodiment 3 of this utility model;
[0024] Figure 7 This is a schematic diagram of the heat exchange rib arrangement in Embodiment 3 of this utility model;
[0025] In the figure: 1. Flat base tube; 101. First plane; 102. Second plane; 2. Fin assembly; 3. Fin; 4. Heat exchange rib; 5. First slope; 6. Second slope; 7. Crest; 8. Trough; 9. First inclined section; 10. Second inclined section; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation 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.
[0028] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.
[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.
[0030] Example 1:
[0031] like Figures 1 to 2 As shown, this utility model provides a finned tube for a direct air-cooled heat exchanger with oblique convex-concave reinforcement, comprising: a flat base tube 1 and a fin assembly 2, wherein the flat base tube 1 is along a first direction (reference) Figure 1 The flat base tube 1 extends along the X direction (reference direction), and has a second direction (reference direction). Figure 1 A first plane 101 and a second plane 102 are arranged and positioned opposite each other in the Y direction. The fin assembly 2 is respectively disposed on the first plane 101 and the second plane 102. The fin assembly 2 includes a plurality of fins 3 arranged along the first direction. Each fin 3 is perpendicular to the first direction and parallel to the second direction. At least a portion of the fins 3 have fins arranged along a third direction (reference) on both sides of the first direction. Figure 2 Multiple heat exchange ribs 4 arranged in the Z direction, wherein the angle α between the heat exchange ribs 4 and the third direction is less than 50°, and the first direction, the second direction, and the third direction are perpendicular to each other.
[0032] In this embodiment, as Figure 3 and Figure 4 As shown, the third direction is parallel to the length direction of the cross-section of the flat base tube 1. The heat exchange ribs 4 are alternately protruding on both sides of the fin 3 along the first direction. When a heat exchange rib 4 is protruding on one side, its corresponding other side is recessed inward to form a corresponding protrusion. The heat exchange ribs with oblique convex-concave reinforcement on both sides of the fin in this utility model can effectively increase the contact area between the fin surface and the fluid, improve the contact time between the fluid and the fin, and achieve good heat transfer effect.
[0033] In this embodiment, the pitch S between two adjacent heat exchange ribs on the same fin remains constant. The pitch S ranges from 4.6mm to 15mm, specifically 5mm, 8mm, 10mm, 12mm, etc. The angle α between the heat exchange rib and the first direction on the same fin remains constant, ranging from 20° to 40°, specifically 25°, 30°, 35°, etc. In specific implementation, the pitch S and angle α are determined according to site requirements. Maintaining a constant pitch S and angle α between the heat exchange ribs on both sides of the same fin is sufficient.
[0034] like Figure 2 and Figure 3 As shown, the heat exchange ribs 4 are oblique in shape, and the inclination direction of the heat exchange ribs 4 located on the first plane is opposite to the inclination direction of the heat exchange ribs 4 located on the second plane. In this embodiment, the included angle α of the heat exchange ribs 4 is selected as 30°. By setting the heat exchange ribs obliquely, the heat exchange performance of the finned tube can be effectively enhanced.
[0035] Specifically, such as Figures 2-4 As shown, the heat exchange fins 4 are symmetrically arranged with a first slope 5 and a second slope 6 along their centerline. The highest points of the first slope 5 and the second slope 6 connect at the centerline of the heat exchange fins 4 to form a crest 7, and the lowest points of the first slope 5 and the second slope 6 respectively form troughs 8. Both the first slope 5 and the second slope 6 are smooth curved surfaces. This arrangement facilitates fluid flow on both sides of the fins and improves the heat exchange effect.
[0036] In this embodiment, the flat base tube 1 is made of steel-aluminum composite plate by rolling and welding. The length f of the cross section of the flat base tube 1 is 209mm to 219mm, the width a of the cross section is 16mm to 20mm, and the thickness c of the flat base tube is 1mm to 1.5mm.
[0037] In this embodiment, one end of the fin 3 is fixed to the flat base tube 1 by brazing. The length e of the fin along the cross-section of the flat base tube is 160-200 mm, and the height d of the fin along the cross-section of the flat base tube is 16-20 mm. The spacing Z between two adjacent fins is 2.3-3 mm, and the thickness of the fin is 0.2-0.3 mm. The fin 3 can be straight or coiled in a serpentine shape and fixed to the first plane 101 and the second plane 102.
[0038] In this embodiment, the fins are fixed to the flat base tube by vacuum diffusion brazing technology. The fins are made of aluminum, have a compact structure, small volume, good heat exchange performance, high temperature resistance, corrosion resistance, good sealing performance, safe and reliable operation, and the production process is simple, the investment cost is low, the maintenance is easy, the service life is long, and it is easy to promote and implement.
[0039] Example 2:
[0040] This embodiment is the same as embodiment 1 except for the following technical solutions:
[0041] like Figure 5 As shown, the heat exchange ribs 4 are oblique in shape, and the inclination direction of the heat exchange ribs 4 located on the first plane 101 is the same as the inclination direction of the heat exchange ribs 4 located on the second plane 102. This arrangement facilitates the installation of fins on the first plane 101 and the second plane 102.
[0042] Example 3:
[0043] This embodiment is the same as embodiment 1 except for the following technical solutions:
[0044] like Figure 6 and Figure 7As shown, the heat exchange rib 4 is zigzag-shaped and includes a first inclined section 9 and a second inclined section 10. One end of the first inclined section 9 gradually approaches one end of the second inclined section 10, while the other end of the first inclined section 9 gradually moves away from the other end of the second inclined section 10. The included angle α between the first and second inclined sections 9 and a third direction is both <50°, preferably 30°, and the included angle β between the first and second inclined sections is <90°, preferably 60°. By setting the heat exchange rib 4 in a zigzag shape, the residence time of the airflow on the fin surface can be increased, thereby increasing the heat exchange effect.
[0045] like Figure 6 As shown, both the first inclined section 9 and the second inclined section 10 include a first slope 5 and a second slope 6. The highest point of the first slope 5 and the highest point of the second slope 6 are connected to form a crest 7, and the lowest point of the first slope 5 and the lowest point of the second slope 6 respectively form a trough 8. Both the first slope 5 and the second slope 6 are smooth curved surfaces. This design increases the contact area between the airflow and the fins, facilitating smooth airflow across the fin surface and enhancing the heat exchange effect.
[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A type of obliquely reinforced direct air-cooled heat exchanger finned tube, characterized in that, include: A flat base tube and a fin assembly, wherein the flat base tube extends along a first direction and has a first plane and a second plane arranged and opposite to each other along a second direction, the fin assembly is respectively disposed on the first plane and the second plane, the fin assembly includes a plurality of fins arranged along the first direction, each fin being perpendicular to the first direction and parallel to the second direction; at least a portion of the fins are provided with a plurality of heat exchange ribs arranged along a third direction on both sides along the first direction, the included angle α between the heat exchange ribs and the third direction being less than 50°, and the first direction, the second direction and the third direction being perpendicular to each other.
2. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: On the same fin, the pitch S between two adjacent heat exchange fins remains constant.
3. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 2, characterized in that: The pitch S ranges from 4.6 mm to 15 mm.
4. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: On the same fin, the included angle α between the heat exchange rib and the first direction remains constant, and the included angle α ranges from 20° to 40°.
5. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: The heat exchange ribs are oblique in shape, and the inclination direction of the heat exchange ribs located on the first plane is the same as or opposite to the inclination direction of the heat exchange ribs located on the second plane.
6. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 5, characterized in that: The heat exchange ribs are symmetrically provided with a first slope and a second slope along their center line. The highest sections of the first slope and the second slope are connected at the center line of the heat exchange ribs to form a peak. The lowest sections of the first slope and the second slope respectively form a trough.
7. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: The heat exchange ribs are zigzag-shaped and include a first inclined section and a second inclined section. One end of the first inclined section and one end of the second inclined section gradually approach each other, and the other end of the first inclined section and the other end of the second inclined section gradually move away from each other. The included angle α between the first and second inclined sections and a third direction is less than 50°, and the included angle β between the first and second inclined sections is less than 90°.
8. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 7, characterized in that: Both the first inclined segment and the second inclined segment include a first slope and a second slope. The highest segment of the first slope and the highest segment of the second slope are connected to form a peak, and the lowest segment of the first slope and the lowest segment of the second slope respectively form a trough.
9. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: The flat base tube has a cross-sectional length f of 209mm to 219mm, a cross-sectional width a of 16mm to 20mm, and a thickness c of 1mm to 1.5mm.
10. The obliquely reinforced direct air-cooled heat exchanger finned tube according to claim 1, characterized in that: The length e of the fins arranged along the cross-section of the flat base tube is 160-200 mm, the height d of the fins arranged along the cross-section of the flat base tube is 16 mm-20 mm, the spacing Z between two adjacent fins is 2.3 mm-3 mm, and the thickness of the fins is 0.2 mm-0.3 mm.