Fin type air heat exchanger
By employing a dual design of internal and external fins in the finned air heat exchanger, combined with an array-type modular structure, the problems of large weight and low heat transfer efficiency of finned heat exchangers are solved, achieving more efficient heat distribution and easier maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA BAOGANGXIN ENERGY CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-28
AI Technical Summary
Existing finned heat exchangers have a large number of external fins on the outside of the heat exchange tubes, resulting in an overall heavy weight, low heat transfer efficiency, and inconvenient maintenance.
It adopts a dual design of internal and external fins. The internal fins are spirally inclined and the spiral line is parallel to the pipe axis. Combined with the array-distributed heat exchanger module structure, the heat transfer process is optimized and the heat exchange area is increased.
It significantly improves heat exchange efficiency by 10% to 30%, ensures uniform heat distribution, reduces maintenance costs and difficulty, reduces flow dead zones, and enhances heat transfer efficiency.
Smart Images
Figure CN224175699U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange equipment technology, specifically a finned air heat exchanger. Background Technology
[0002] Finned heat exchangers are a widely used type of heat exchange device in gas-liquid heat exchangers. They enhance heat transfer by adding fins to the base tubes and are primarily used for heating air in drying systems, serving as a key component of hot air units. In practical applications, ordinary finned heat exchangers typically only have external fins on the outside of the heat exchange tubes to increase the heat exchange area. Furthermore, to improve the heat transfer coefficient, the spacing between fins is often reduced and the fin height is increased to improve the fin ratio. This indirectly adds a large number of external fins, resulting in problems such as overall weight imbalance in the finned heat exchanger. Utility Model Content
[0003] The purpose of this invention is to provide a finned air heat exchanger to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a finned air heat exchanger, comprising a cylindrical body and multiple sets of heat exchanger modules, wherein an inlet and an outlet are formed on the outer side of the cylindrical body, the inlet and outlet including an inlet for air entry and an outlet for air exhaust; the heat exchanger modules are disposed within the cylindrical body, and each pair of adjacent heat exchanger modules are detachably connected and fixed together, each heat exchanger module including two tube sheets and a heat exchange tube bundle, the heat exchange tube bundle being fixed between the two tube sheets, the heat exchange tube bundle being composed of multiple parallel heat exchange tubes; the heat exchange tubes include pipes, inner fins and outer fins, wherein the pipes are circular pipes with hollow fluid channels, the inner fins are concentrically nested in the inner wall of the pipes and allow fluid to pass through the hollow fluid channels, the outer fins are concentrically nested in the outer wall of the pipes; the inner fins adopt a helical inclined structure, and the helix is parallel to the axial direction of the pipes, the inclination of the ribs of the inner fins relative to the helix does not exceed 25°.
[0005] Based on the above technical features, the finned air heat exchanger provided in this utility model significantly increases the heat exchange area of the inner and outer walls of the heat exchange tubes through a dual design of internal and external fins. Compared to ordinary finned heat exchangers of the same mass, the overall heat exchange efficiency is improved by 10% to 30%. Furthermore, the dual design of internal and external fins not only optimizes the heat transfer process but also allows heat to be distributed more evenly and quickly throughout the entire air heat exchanger. The tube sheet and heat exchange tube bundle are combined into independent heat exchanger modules, and multiple heat exchanger modules are combined into a complete finned air heat exchanger. This allows for convenient repair or replacement of individual faulty heat exchanger modules during operation, eliminating the need to shut down the entire air heat exchanger for maintenance, greatly reducing maintenance costs and difficulty.
[0006] In this preferred embodiment, the inlet and outlet are formed at opposite ends of the cylinder, and the two tube sheets are located at the inlet and outlet positions of the cylinder, respectively.
[0007] Based on the above technical features, the tube sheet is set at the air inlet and outlet positions, which can guide air and gas to enter or flow out of the heat exchanger evenly, reduce the flow dead zone, and improve the heat transfer efficiency.
[0008] In this preferred embodiment, the projections of multiple parallel heat exchange tubes onto the tube sheet are arranged in an array.
[0009] Based on the above technical features, the heat exchange tube bundles in a single heat exchanger module are evenly distributed in an array, which can ensure the uniform distribution of heat, avoid local overcooling or overheating, and improve the overall heat exchange efficiency.
[0010] In this preferred embodiment, the inclination of the ribs of the inner fins relative to the helix is 15° to 20°.
[0011] Based on the above technical features, the design of the fins inside the tube takes into account the characteristics of fluid flow, reduces the resistance to fluid flow, and indirectly improves the heat exchange efficiency of the heat exchanger.
[0012] In this preferred embodiment, the ratio of the fin height of the inner tube to the pipe diameter is in the range of 0.2 to 0.4, and the inner tube fin has a flow port along the spiral direction.
[0013] In this preferred embodiment, the outer fins of the tube adopt a spiral structure, and the spiral line is parallel to the axial direction of the tube. Attached Figure Description
[0014] Figure 1 This is a front view of a single heat exchanger module in the finned air heat exchanger of this utility model embodiment;
[0015] Figure 2This is a side view of a single heat exchanger module in an embodiment of the present invention;
[0016] Figure 3 This is a cross-sectional view of the heat exchange tube in an embodiment of this utility model;
[0017] Figure 4 This is a longitudinal cross-sectional view of the heat exchange tube according to an embodiment of the present invention.
[0018] In the diagram: 1. Tube sheet; 2. Heat exchange tube; 21. Pipe; 22. Inner fins of the tube; 23. Outer fins of the tube. Detailed Implementation
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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 discussed or described in detail in the description of the subsequent figures.
[0023] like Figures 1 to 4 As shown, the present invention provides a technical solution: a finned air heat exchanger, wherein the finned air heat exchanger includes a cylinder and multiple sets of heat exchanger modules.
[0024] The outer side of the shell has inlets and outlets, including an inlet for air intake and an outlet for air exhaust. Heat exchanger modules are housed within the shell, with each pair of adjacent modules detachably connected and fixed. Each heat exchanger module includes two tube sheets 1 and a heat exchange tube bundle, which is fixed between the two tube sheets 1. The heat exchange tube bundle consists of multiple parallel heat exchange tubes 2. The projections of the multiple parallel heat exchange tubes 2 onto the tube sheets 1 form an array.
[0025] In this invention, the tube sheet 1 and the heat exchange tube bundle are combined to form an independent heat exchanger module. Multiple heat exchanger modules are combined to form a complete finned air heat exchanger. This allows for convenient repair or replacement of individual faulty heat exchanger modules during operation, without the need to shut down the entire air heat exchanger for maintenance, thus greatly reducing maintenance costs and difficulty.
[0026] Furthermore, both tube sheets 1 are provided with through holes, and the two ends of the heat exchange tubes 2 are inserted into the corresponding through holes, and the heat exchange tubes 2 are fixedly connected to the tube sheets 1 by welding or other means.
[0027] like Figure 1 and Figure 2 As shown, each of the two tube sheets 1 of a single heat exchanger module has nine through holes arranged in a 3x3 array. The heat exchange tube bundle includes nine heat exchange tubes 2, with both ends of the tubes 2 passing through their corresponding through holes and fixed to the tube sheet 1 by welding. In the above embodiment, the through holes are arranged in a square pattern. In other embodiments, the through holes can also be arranged in equilateral triangles, rectangles, rhombuses, hexagons, etc., as long as they meet the requirements of convenient maintenance and good heat dissipation.
[0028] Furthermore, the inlet and outlet are formed at opposite ends of the cylinder, and the two tube sheets 1 are located at the inlet and outlet positions of the cylinder, respectively, to guide air and gas to enter or flow out of the heat exchanger uniformly, reduce the flow dead zone, and improve the heat transfer efficiency.
[0029] like Figure 3 and Figure 4 As shown, the heat exchange tube 2 includes a pipe 21, inner fins 22, and outer fins 23. The pipe 21 is a circular pipe with a hollow fluid channel. The inner fins 22 are concentrically nested in the inner wall of the pipe 21, allowing fluid to pass through the hollow fluid channel. The outer fins 23 are concentrically nested in the outer wall of the pipe 21. The inner fins 22 have a helical inclined structure, and the helix is parallel to the axis of the pipe 21. The inclination of the ribs of the inner fins 22 relative to the helix does not exceed 25°.
[0030] The finned air heat exchanger provided in this utility model significantly increases the heat exchange area of the inner and outer walls of the heat exchange tube 2 by adopting a dual design of inner fins 22 and outer fins 23. Under the same mass, the overall heat exchange efficiency is improved by 10% to 30% compared with ordinary finned heat exchangers. At the same time, the dual design of inner and outer fins not only optimizes the heat transfer process, but also enables the heat to be distributed more evenly and quickly throughout the air heat exchanger.
[0031] Furthermore, the inclination angle of the ribs of the inner fin 22 relative to the helix is 15° to 20°. Within this range, the balance between fluid disturbance and pressure drop can be effectively optimized. At the same time, a moderate helical inclination angle can also enhance fluid turbulence and improve heat exchange efficiency. Specifically, the inclination angle can be selected as 15°, 16°, 17°, 18°, 19°, or 20°.
[0032] Furthermore, the ratio of the fin height of the inner tube 22 to the diameter of the pipe 21 ranges from 0.2 to 0.4. Within this range, it not only improves the heat exchange capacity of the heat exchange tube 2 but also effectively reduces the resistance to fluid flow. The inner tube fins 22 have flow openings along the helical direction to minimize the influence of the inner tube fins 22 on fluid flow. The flow openings can be slots or holes provided on the fins.
[0033] Specifically, the external fins 23 can adopt a helical structure, with the helix parallel to the axial direction of the pipe 21. In other embodiments, the external fins 23 can also be longitudinally continuous straight fins or corrugated fins, etc.
[0034] In this invention, the inner fins 22 and the outer fins 23 can be made of various materials, such as steel strip, stainless steel strip, copper strip and aluminum strip, etc., and the connection between the inner fins 22 and the outer fins 23 and the pipe 21 can be expansion joint or brazing joint; the fluid used for heat exchange can be steam, hot water or heat transfer oil, etc.
[0035] 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 finned air heat exchanger, characterized in that, include: A cylindrical body, wherein an inlet and an outlet are formed on the outer side of the cylindrical body, the inlet and an outlet including an inlet for air to enter and an outlet for air to exit; Multiple heat exchanger modules are provided in the cylinder. Each pair of adjacent heat exchanger modules is detachably connected and fixed. Each heat exchanger module includes two tube sheets (1) and a heat exchange tube bundle. The heat exchange tube bundle is fixed between the two tube sheets (1). The heat exchange tube bundle is composed of multiple parallel heat exchange tubes (2). The heat exchange tube (2) includes a pipe (21), inner fins (22) and outer fins (23). The pipe (21) is a circular pipe with a hollow fluid channel. The inner fins (22) are concentrically nested in the inner wall of the pipe (21) and allow fluid to pass through the hollow fluid channel. The outer fins (23) are concentrically nested in the outer wall of the pipe (21). The fins (22) inside the tube adopt a spiral inclined structure, and the spiral line is parallel to the axial direction of the pipe (21). The inclination of the ribs of the fins (22) inside the tube relative to the spiral line does not exceed 25°.
2. A finned air heat exchanger according to claim 1, characterized in that, The inlet and outlet are respectively formed at opposite ends of the cylinder, and the two tube sheets (1) are respectively located at the inlet and outlet positions of the cylinder.
3. A finned air heat exchanger according to claim 1, characterized in that, The projections of multiple parallel heat exchange tubes (2) onto the tube sheet (1) are arranged in an array.
4. A finned air heat exchanger according to claim 1, characterized in that, The ribs of the tube fins (22) are inclined at an angle of 15° to 20° relative to the helix.
5. A finned air heat exchanger according to claim 1, characterized in that, The ratio of the fin height of the inner tube (22) to the diameter of the pipe (21) is in the range of 0.2 to 0.4, and the inner tube (22) has a flow port along the spiral direction.
6. A finned air heat exchanger according to claim 1, characterized in that, The outer fins (23) of the tube adopt a spiral structure, and the spiral line is parallel to the axial direction of the pipe (21).