Heat exchange tube and heat exchanger

Abstract

The application provides a heat exchange tube and a heat exchanger. The heat exchange tube comprises a tube body (1), an inner tooth (2) is arranged in the tube body (1), the inner tooth (2) comprises a first inner tooth unit (21) and a second inner tooth unit (22) which are different in height and / or shape, the first inner tooth unit (21) and the second inner tooth unit (22) are arranged at intervals, and a fluid passage (3) is formed between adjacent first inner tooth units (21) and second inner tooth units (22). The heat exchanger has the heat exchange tube. The application solves the problems of excessive flow resistance of fluid, excessive pressure loss and limited heat exchange efficiency improvement caused by the continuous thread line structure in the prior art.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more specifically, to a heat exchange tube and a heat exchanger. Background Technology

[0002] Heat transfer tubes have a wide range of applications in the field of heat transfer. By using heat transfer tubes, the heat transfer performance of fluids inside and outside the tubes can be enhanced, thereby improving the heat transfer capacity of the heat exchanger used. Their application development is of great significance.

[0003] Heat exchange tubes are indirect-flow heat exchange elements. Generally, one fluid flows inside the tube, and heat is exchanged with another fluid outside the tube through the tube wall. The method to enhance the heat transfer of the fluid inside the tube is generally to add spiral-shaped internal teeth inside the tube to enhance the turbulence of the fluid, increase the heat transfer area, enhance heat transfer, and thus reduce the thermal resistance of heat transfer inside the tube; the cross-sectional shape of the internal teeth is generally triangular or trapezoidal.

[0004] However, the simple threaded internal tooth structure can only promote fluid turbulence once. Heat exchanger tube manufacturers often try to enhance turbulence and promote heat transfer by adjusting the structural parameters of the threaded internal teeth, but the enhancement effect is ultimately limited and will increase the fluid resistance inside the tube. To meet the requirements of "high-efficiency and energy-saving" heat exchanger design and further improve heat exchange efficiency, it is necessary to further enhance the heat exchange efficiency inside the tube. This requires changing the internal enhancement method to further enhance internal heat exchange and resistance reduction. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a heat exchange tube and a heat exchanger that solves the issues of excessive pressure loss due to excessive flow resistance of fluids caused by the continuous threaded structure in the prior art, as well as the limited improvement in heat exchange efficiency.

[0006] The present invention provides a heat exchange tube, including a tube body, wherein internal teeth are arranged inside the tube body, the internal teeth including first internal tooth units and second internal tooth units with different heights and / or different shapes, wherein the first internal tooth units and the second internal tooth units are arranged at intervals, and fluid channels are formed between adjacent first internal tooth units and second internal tooth units.

[0007] As a further optimization of the present invention, the first internal tooth unit and the second internal tooth unit have different heights, and both are three-dimensional with a thinner top and a thicker bottom.

[0008] As a further optimization of the present invention, the three-dimensional shape is a frustum or a cylindrical cone.

[0009] As a further optimization of the present invention, the spacing between adjacent internal teeth is 0.15mm-10mm.

[0010] As a further optimization of the present invention, the height difference between the first internal tooth unit and the second internal tooth unit is between 0.1mm and 4.85mm.

[0011] As a further optimization of the present invention, the height of the first internal tooth unit is 0.25mm to 5mm, and the height of the second internal tooth unit is 0.15mm to 4.5mm.

[0012] As a further optimization of the present invention, the first internal tooth unit and the second internal tooth unit are perpendicular to the inner wall of the tube and point towards the inside of the tube.

[0013] As a further optimization of the present invention, the internal teeth are arranged in a cross pattern.

[0014] As a further optimization of the present invention, the first internal tooth unit and the second internal tooth unit have the same height and have one of the following shapes: the first internal tooth unit is a frustum and the second internal tooth unit is a cylindrical cone; or the first internal tooth unit is a cylindrical cone and the second internal tooth unit is a frustum.

[0015] The present invention also provides a heat exchanger comprising the heat exchange tubes described in any of the above embodiments.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The heat exchange tube and heat exchanger of the present invention, by setting a spacing between the internal teeth, ensures the heat transfer area inside the tube. After the incoming fluid flows through each row of independent internal teeth arranged in a staggered pattern, it will be continuously and repeatedly turbulent and scourned. In addition, the changes in the shape and height of each row of internal teeth along the incoming flow can further turbulentize, disturb, and disrupt the boundary layer of the fluid flow, thereby forming a multi-dimensional, full-field flow. This allows the entire flow streamline inside the tube to be disturbed in all directions and fully developed, thereby enhancing the degree of turbulence and improving the heat transfer inside the tube.

[0018] Meanwhile, since crossflow occurs in the gaps when the fluid flows, the use of a three-dimensional shape that is thinner at the top and thicker at the bottom can reduce fluid resistance and greatly reduce the flow resistance of the fluid inside the pipe. Attached Figure Description

[0019] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0020] Figure 1 This is a perspective view of the heat exchange tube of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the first type of structure inside the central tube;

[0022] Figure 3 for Figure 2 Top view;

[0023] Figure 4 for Figure 2 Cross-sectional view;

[0024] Figure 5 yes Figure 1 Schematic diagram of the second type of structure inside the central tube;

[0025] Figure 6 yes Figure 5 Cross-sectional view;

[0026] Figure 7 yes Figure 1 Schematic diagram of the third type of structure inside the central tube;

[0027] Figure 8 yes Figure 7 Top view;

[0028] Figure 9 yes Figure 7 Cross-sectional view;

[0029] Figures 10a-10d This is a schematic diagram of the distribution of internal teeth.

[0030] In the above figures, 1 is the tube body; 2 is the internal tooth; 21 is the first internal tooth unit; 22 is the second internal tooth unit; and 3 is the fluid channel.

[0031] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0034] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system comprising said element. In the description of this invention, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention.

[0035] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] like Figure 1-9 As shown, the present invention provides a heat exchange tube, which includes a tube body 1, and internal teeth 2 arranged inside the tube body 1. The internal teeth 2 include a first internal tooth unit 21 and a second internal tooth unit 22 with different heights and / or different shapes. The first internal tooth unit 21 and the second internal tooth unit 22 are arranged at intervals, and a fluid channel 3 is formed between adjacent first internal tooth units 21 and second internal tooth units 22.

[0037] By setting internal teeth of different heights and / or different shapes, the fluid will be continuously and repeatedly turbulent and swept as it flows through each row of independent internal teeth, thereby enhancing the degree of turbulence and improving heat transfer inside the pipe.

[0038] Specifically, the above embodiments are as follows:

[0039] In the first embodiment, the first internal tooth unit 21 and the second internal tooth unit 22 have different shapes and different heights.

[0040] like Figure 2-4 As shown, both the first internal tooth unit 21 and the second internal tooth unit 22 are three-dimensional shapes that are thinner at the top and thicker at the bottom. The first internal tooth unit 21 is a frustum of a cone, that is, a combination of a cone at the top and a cylinder at the bottom, while the second internal tooth unit 22 is a frustum of a cone. The first internal tooth unit 21 and the second internal tooth unit 22 have different heights. For example, the height of the first internal tooth unit 21 is lower than the height of the second internal tooth unit 22.

[0041] In this embodiment, preferably, the height difference between the first internal gear unit 21 and the second internal gear unit 22 is between 0.1mm and 4.85mm. The height h1 of the first internal gear unit 21 is 0.25mm to 5mm, and the height h2 of the second internal gear unit 22 is 0.15mm to 4.5mm.

[0042] As the fluid flows through the pipe, it passes through independent rows of teeth formed by the first and second internal tooth units, which are of different heights and shapes. This causes continuous and repeated turbulence and scouring. Furthermore, the variations in the shape and height of the teeth along each row of teeth further turbulent the fluid flow, disrupting the boundary layer. This results in a multi-dimensional, full-field flow, allowing the entire flow streamline within the pipe to be disturbed and fully developed, thereby enhancing the degree of turbulence and improving heat transfer within the pipe.

[0043] As mentioned above, since crossflow occurs in the gaps during fluid flow, by selecting a three-dimensional shape that is thinner at the top and thicker at the bottom, the fluid resistance can be reduced, greatly lowering the flow resistance of the fluid inside the pipe.

[0044] In the second embodiment, the first internal tooth unit 21 and the second internal tooth unit 22 have different shapes but the same height.

[0045] like Figure 5 and Figure 6 As shown, the first internal tooth unit 21 and the second internal tooth unit 22 have different shapes. Both are three-dimensional shapes that are thinner at the top and thicker at the bottom. However, the first internal tooth unit 21 is preferably a frustum of a cone, that is, a combination of a cone at the top and a cylinder at the bottom, while the second internal tooth unit 22 is a frustum of a cone.

[0046] That is, the first internal tooth unit 21 and the second internal tooth unit 22 have the same height and one of the following shapes: the first internal tooth unit 21 is a frustum and the second internal tooth unit 22 is a cylindrical cone; or the first internal tooth unit 21 is a cylindrical cone and the second internal tooth unit 22 is a frustum.

[0047] In the third embodiment, the first internal tooth unit 21 and the second internal tooth unit 22 have different heights but the same shape.

[0048] like Figures 7-9As shown, in this embodiment, both the first internal tooth unit 21 and the second internal tooth unit 22 are three-dimensional shapes that are thinner at the top and thicker at the bottom. Optionally, both can be frustum conical, i.e., a combination of a cone at the top and a cylinder at the bottom, or both can be frustum conical. However, their heights are different. Preferably, the height h1 of the first internal tooth unit 21 is 0.25mm to 5mm, and the height h2 of the second internal tooth unit 22 is 0.15mm to 4.5mm. The height difference between the first internal tooth unit 21 and the second internal tooth unit 22 is between 0.1mm and 4.85mm.

[0049] As mentioned above, since crossflow occurs in the gaps during fluid flow, by selecting a three-dimensional shape that is thinner at the top and thicker at the bottom, the fluid resistance can be reduced, greatly lowering the flow resistance of the fluid inside the pipe.

[0050] However, in any embodiment, the spacing between adjacent internal teeth is 0.15mm-10mm.

[0051] In addition, as described above, the first internal tooth unit 21 and the second internal tooth unit 22 are perpendicular to the inner wall of the tube body 1 and point inward into the tube body 1.

[0052] like Figures 10a-10d As a preferred embodiment, the internal teeth 2 are arranged in a cross pattern, and their arrangement along the incoming flow presents a triangular, transposed triangular, or transposed square arrangement, etc. Specifically, for example... Figures 10a-10d In other words, the direction of the incoming flow and the spacing between the inner teeth form triangles, transposed triangles, squares, and transposed squares. Under this setting, the incoming flow will be continuously and repeatedly turbulent and swept as it passes through each row of inner teeth, thereby enhancing the degree of turbulence and improving heat transfer inside the tube.

[0053] Meanwhile, in the above embodiments, preferably, the number of circumferential internal teeth 2 is 6-90, and this number can be specifically determined according to the size of the pipe diameter.

[0054] The present invention also provides a heat exchanger comprising the heat exchange tubes described in any of the above embodiments.

[0055] Obviously, the embodiments described above are only some embodiments of the present invention, and not all embodiments.

[0056] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat exchange tube, characterized by, The heat exchange tube comprises a tube body (1), and an inner tooth (2) is arranged in the tube body (1), wherein the inner tooth (2) comprises first inner tooth units (21) and second inner tooth units (22) which are different in height and / or shape, the first inner tooth units (21) and the second inner tooth units (22) are arranged at intervals, and a fluid passage (3) is formed between adjacent first inner tooth units (21) and second inner tooth units (22); the first inner tooth units (21) and the second inner tooth units (22) are all in a solid shape of thin top and thick bottom, and the solid shape is a circular truncated cone or a circular cylinder cone; and the inner tooth (2) is arranged in a cross arrangement. The arrangement of the inner tooth (2) presents one or more of a triangle, a transposed triangle, a square or a transposed square in the direction of the incoming flow.

2. The heat exchange tube according to claim 1, wherein The first inner tooth units (21) and the second inner tooth units (22) are different in height.

3. The heat exchange tube according to claim 1, wherein The interval between adjacent inner teeth is 0.15mm-10mm.

4. The heat exchange tube of claim 1, wherein The height difference between the first inner tooth units (21) and the second inner tooth units (22) is 0.1mm-4.85mm.

5. The heat exchange tube of claim 1, wherein The height of the first inner tooth units (21) is 0.25mm-5mm, and the height of the second inner tooth units (22) is 0.15mm-4.5mm.

6. The heat exchange tube of claim 1, wherein The first inner tooth units (21) and the second inner tooth units (22) are perpendicular to the inner wall of the tube body (1) and point to the inside of the tube body (1).

7. The heat exchange tube of claim 1, wherein The first inner tooth units (21) and the second inner tooth units (22) are the same in height and are one of the following shapes: The first inner tooth units (21) are circular truncated cone bodies, and the second inner tooth units (22) are circular cylinder cone bodies; or the first inner tooth units (21) are circular cylinder cone bodies, and the second inner tooth units (22) are circular truncated cone bodies.

8. A heat exchanger, characterized by The heat exchange tube comprises the heat exchange tube according to any one of claims 1-7.

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