Efficient round tube heat exchanger structure with pressure pits
By setting indentations and alloy materials on the surface of the circular tube heat exchanger, and adopting a triangular forked spherical indentation and a wave-shaped structure, the problem of insufficient heat exchange efficiency of existing heat exchangers is solved, and more efficient heat transfer and flow performance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUXI FEIDONG LUBRICATION TECHNOLOGY CO LTD
- Filing Date
- 2026-04-21
- Publication Date
- 2026-05-29
Smart Images
Figure CN122107848A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of energy and heat exchanger technology, and particularly relates to a high-efficiency circular tube heat exchanger structure with a pressure pit. Background Technology
[0002] With social development and scientific and technological progress, energy issues are becoming increasingly prominent. Meanwhile, with the vigorous promotion of low-carbon and environmentally friendly concepts, energy conservation and emission reduction have taken root in people's minds. Heat is one of the most common ways of energy transfer. Controlling heat exchange efficiency is one of the indirect ways to save energy and reduce emissions, contributing to the achievement of low-carbon and environmentally friendly practices. In industry, the effects of controlling heat exchange efficiency are particularly significant. In the more precise and demanding field of aviation, controlling heat exchange efficiency can reduce fuel consumption, thereby increasing the aircraft's maximum range and reducing pollution.
[0003] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements. It is also a key component for improving energy efficiency. In the core aero-engine field of aviation, heat exchangers are generally small and lightweight, making heat exchange difficult and resulting in uncontrollable heat exchange efficiency. This negatively impacts aero-engine performance, thus making heat exchange efficiency control crucial. While circular tube structures are relatively simple and widely used in various heat exchangers, their heat exchange area is relatively small, limiting their advantages and requiring further improvement. They can be considered as a preliminary research area.
[0004] Recent domestic research has generally focused on the overall tube design, with less attention paid to local design aspects. However, the pressure-indentation process is relatively simple and easy to implement, and can be used in conjunction with other designs. Furthermore, it offers reproducibility and supplementation for certain designs. Therefore, inventing a technology with pressure indentations that can significantly improve the heat exchange efficiency of shell-and-tube heat exchangers is of great significance. Summary of the Invention
[0005] To address the problems existing in the prior art, this invention provides a high-efficiency circular tube heat exchanger structure with a pressure pit, which has the advantages of being simple, efficient and low-cost, and solves the problem of poor heat exchange efficiency in existing shell-and-tube heat exchangers.
[0006] The present invention is implemented as follows: a high-efficiency circular tube heat exchanger structure with pressure pit, comprising a circular tube heat exchanger, wherein the surface of the circular tube heat exchanger is provided with pressure pit, and the cross-section of the circular tube heat exchanger is circular.
[0007] As a preferred embodiment of the present invention, the material of the circular tube heat exchanger is an alloy, the alloy grade is 6061, the technical condition is: 134-XY-1301, the outer diameter of the circular tube heat exchanger is 2.36mm, the inner diameter is 1.75mm, and the wall thickness is 0.305mm.
[0008] As a preferred embodiment of the present invention, the circular tube heat exchanger is corrugated, the length of the circular tube heat exchanger is 9mm, the circular tube heat exchanger includes an expansion section and a contraction section, the length of the expansion section is 6mm, and the length of the contraction section is 3mm.
[0009] As a preferred embodiment of the present invention, the expansion section and the contraction section have a smooth transition.
[0010] As a preferred embodiment of the present invention, the indentations are arranged in a triangular fork pattern, with three rows of indentations per group, and the spacing between them is equal at 9 mm. The spacing between different groups of indentations is also equal at 27 mm. There are two indentations per row, with a rotation axis distance of 180°. The rotation axis distance between adjacent rows of indentations is 60°. The angle between the rotation axis of the first row of indentations in each group and the horizontal plane is 60°.
[0011] As a preferred embodiment of the present invention, the shape of the indentation is spherical with a spherical radius of 1.5 mm. The outer diameter of the spherical indentation at the cross-section of the indentation is tangent to a circle with a diameter of 1.17 mm centered on the center of the circular tube. The size and shape of each indentation are equal and symmetrical.
[0012] 1. This invention addresses the issue that recent domestic research has generally focused on the overall tube design, with limited attention paid to local design aspects. This invention employs a dented tube shell-and-tube heat exchanger, which allows for a gradual increase in the effective heat exchange area within the aero-engine, enhancing convective heat transfer, increasing pressure loss, increasing flow resistance, increasing the average Nusselt number, and improving flow heat transfer performance. The denting process is relatively simple and easy to implement, and it can be used in conjunction with other designs. Furthermore, it offers reproducibility and supplementation for certain designs. Attached Figure Description
[0013] Figure 1 A schematic diagram of the overall design of the press-in circular tube heat exchanger.
[0014] In the diagram: 1. Circular tube heat exchanger; 2. Pressure crater. Detailed Implementation
[0015] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.
[0016] The structure of the present invention will now be described in detail with reference to the accompanying drawings. Example
[0017] like Figure 1As shown in the figure, an embodiment of the present invention provides a high-efficiency circular tube heat exchanger structure with a pressure pit, including a circular tube heat exchanger 1, wherein a pressure pit 2 is provided on the surface of the circular tube heat exchanger 1, and the cross-section of the circular tube heat exchanger 1 is circular.
[0018] The circular tube heat exchanger 1 is made of alloy 6061, with technical specifications 134-XY-1301. The outer diameter of the circular tube heat exchanger 1 is 2.36 mm, the inner diameter is 1.75 mm, and the wall thickness is 0.305 mm. The circular tube heat exchanger 1 is corrugated and has a length of 9 mm. It includes an expansion section and a contraction section, with the expansion section being 6 mm long and the contraction section being 3 mm long. The expansion and contraction sections have a smooth transition. The pressure pits 2 are arranged in a triangular pattern, with three rows per group of pressure pits 2, all equally spaced at 9 mm intervals. The spacing between different groups of pressure pits 2 is also equal at 27 mm. mm, each row has two pressure pits 2, with a rotation axis distance of 180°, the rotation axis distance between adjacent rows of pressure pits 2 is 60°, the angle between the rotation axis of the first row of each group of pressure pits 2 and the horizontal plane is 60°, the shape of the pressure pit 2 is spherical, the spherical radius is 1.5mm, the outer diameter of the spherical pressure pit 2 at the cross section of the pressure pit 2 is tangent to a circle with a diameter of 1.17mm centered on the center of the circular tube, and the size and shape of each pressure pit 2 are equal and symmetrical.
[0019] The above scheme employs a triangular, staggered arrangement of pressure pits 2 on the surface of the circular tube heat exchanger 1. This arrangement creates a complex flow pattern as the fluid flows across the heat exchanger surface, increasing turbulence. Increased turbulence enhances the heat transfer efficiency between the fluid and the heat exchanger surface because it effectively disrupts the fluid boundary layer, leading to faster heat transfer. Each group of pressure pits 2 consists of three rows, with two pits 2 per row. The rotation distance between adjacent rows of pits 2 is 60°. The rotation angle between the first row of pits 2 and the horizontal plane is also 60°. All pits 2 are equal in size and shape and symmetrical. This regular and symmetrical layout ensures more uniform fluid flow across the heat exchanger surface, preventing localized flow obstruction and improving overall heat transfer efficiency. Regarding thermal performance, the pressure pit 2 is spherical with a radius of 1.5 mm. The outer diameter of the spherical pressure pit 2 is tangent to a circle with a diameter of 1.17 mm centered on the center of the circular tube. The spherical pressure pit 2 design reduces fluid flow resistance and enhances local flow velocity, facilitating heat transfer and exchange, thus improving the heat exchange efficiency of the heat exchanger. The circular tube heat exchanger 1 is corrugated, increasing its surface area. A larger surface area means a larger contact area between the fluid and the heat exchanger, allowing for more heat exchange in the same amount of time, thus improving the heat exchange capacity. The corrugated structure also generates some disturbance in the fluid flow, enhancing turbulence and promoting heat transfer. The heat exchanger comprises an expansion section and a contraction section, with the expansion section being 6 mm long and the contraction section 3 mm long. The expansion and contraction sections have a smooth transition, allowing the fluid to experience different velocity changes during flow. In the expansion section, the fluid velocity decreases and the pressure increases, facilitating efficient heat transfer; in the contraction section, the fluid velocity increases, rapidly carrying away heat and thus improving the overall heat exchange efficiency. The smooth transition design reduces energy loss during fluid flow and ensures fluid flow stability. The material of the circular tube heat exchanger 1 is an alloy, alloy grade 6061, technical condition 134-XY-1301. The alloy material possesses excellent physical and chemical properties, such as high strength, corrosion resistance, and thermal conductivity. The high strength... To ensure the heat exchanger can withstand certain pressure and temperature changes during operation, and is not easily deformed or damaged; good corrosion resistance can extend the service life of the heat exchanger and reduce failures and maintenance costs caused by corrosion; while high thermal conductivity is conducive to rapid heat transfer and improves the working efficiency of the heat exchanger. The outer diameter of the circular tube heat exchanger 1 is 2.36mm, the inner diameter is 1.75mm, the wall thickness is 0.305mm, and the length is 9mm. The reasonable design of the dimensions comprehensively considers factors such as fluid flow, heat transfer, and structural strength. The appropriate pipe diameter and wall thickness can ensure that the fluid flow resistance in the pipe is moderate and that the structural strength of the heat exchanger is guaranteed. The appropriate length can achieve a good heat exchange effect within a limited space.In addition, the 27mm spacing between each pressure pit 2 and the 9mm spacing between the inner rows of each pressure pit 2 are designed to ensure the uniformity and efficiency of fluid flow and heat exchange.
[0020] As a specific embodiment, the number of rows of pressure pits 2 in the circular tube heat exchanger 1 is 1.
[0021] Comparative Example 1: This comparative example provides a circular tube heat exchanger structure, which is basically the same as that of Example 1, except that the circular tube heat exchanger 1 does not have a pressure pit 2 and has only one circular tube.
[0022] Comparative Example 2: This comparative example provides a pressure pit heat exchanger structure, which is basically the same as that in Example 1, except that the pressure pit 2 heat exchanger has 2 rows of pressure pits.
[0023] Comparative Example 3: This comparative example provides a pressure pit heat exchanger structure, which is basically the same as that in Example 1, except that the number of pressure pits 2 in this pressure pit heat exchanger is 3.
[0024] Comparative Example 4: This comparative example provides a pressure pit heat exchanger structure, which is basically the same as that of Example 1, except that the number of pressure pits 2 in this pressure pit heat exchanger is 4.
[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0026] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A high-efficiency circular tube heat exchanger structure with a pressure pit, characterized in that: It includes a circular tube heat exchanger (1), the surface of which is provided with a pressure pit (2), and the cross-section of the circular tube heat exchanger (1) is circular.
2. The high-efficiency circular tube heat exchanger structure with pressure pit as described in claim 1, characterized in that: The material of the circular tube heat exchanger (1) is an alloy, the alloy grade is 6061, and the technical condition is 134-XY-1301. The outer diameter of the circular tube heat exchanger (1) is 2.36 mm, the inner diameter is 1.75 mm, and the wall thickness is 0.305 mm.
3. The high-efficiency circular tube heat exchanger structure with pressure pit as described in claim 1, characterized in that: The circular tube heat exchanger (1) is corrugated and has a length of 9 mm. The circular tube heat exchanger (1) includes an expansion section and a contraction section, with the expansion section having a length of 6 mm and the contraction section having a length of 3 mm.
4. The high-efficiency circular tube heat exchanger structure with pressure pit as described in claim 3, characterized in that: The expansion and contraction sections have a smooth transition.
5. The high-efficiency circular tube heat exchanger structure with pressure pit as described in claim 1, characterized in that: The pressure pits (2) are arranged in a triangular fork pattern. Each group of pressure pits (2) consists of three rows with equal spacing of 9 mm. The spacing between different groups of pressure pits (2) is also equal at 27 mm. Each row has two pressure pits (2) with a rotation axis of 180°. The rotation axis of adjacent rows of pressure pits (2) is 60°. The angle between the rotation axis of the first row of pressure pits (2) and the horizontal plane is 60°.
6. The high-efficiency circular tube heat exchanger structure with pressure pit as described in claim 1, characterized in that: The shape of the indentation (2) is spherical with a spherical radius of 1.5 mm. The outer diameter of the spherical indentation (2) at the cross section of the indentation (2) is tangent to a circle with a diameter of 1.17 mm centered on the center of the circular tube. The size and shape of each indentation (2) are equal and symmetrical.