阅读说明：本技术 用于管翅式换热器的翅片、管翅式换热器及空调器
(Fin for tube-fin heat exchanger, tube-fin heat exchanger and air conditioner
) 是由 李兆辉
邓建云 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种用于管翅式换热器的翅片和具有其的管翅式换热器及空调器,翅片包括：基片,基片上形成有至少一个管孔单元,管孔单元包括管孔和多个凸起,管孔沿基片的厚度方向贯通基片,多个凸起与管孔在基片上间隔开设置,其中,多个凸起均环绕管孔延伸,且多个凸起沿管孔的径向方向依次布置。根据本发明的用于管翅式换热器的翅片,通过在管孔周围的基片上形成多个沿管孔的周向延伸的凸起,并使多个凸起均沿管孔的径向方向依次布置,由此,多个凸起可以增加翅片的表面积,对经过翅片表面的气流扰流,控制气流方向,使气流环绕管孔的周沿流动,延长气流的流通路径,从而提高翅片的换热效率。(The invention discloses a fin for a tube-fin heat exchanger, the tube-fin heat exchanger with the fin and an air conditioner, wherein the fin comprises: the substrate, be formed with at least one pipe hole unit on the substrate, the pipe hole unit includes pipe hole and a plurality of arch, and the pipe hole link up the substrate along the thickness direction of substrate, and a plurality of archs set up with the pipe hole is spaced apart on the substrate, and wherein, a plurality of archs all encircle the pipe hole and extend, and a plurality of archs arrange in proper order along the radial direction of pipe hole. According to the fin for the tube-fin heat exchanger, the plurality of protrusions extending along the circumferential direction of the tube hole are formed on the substrate around the tube hole, and the plurality of protrusions are sequentially arranged along the radial direction of the tube hole, so that the surface area of the fin can be increased by the plurality of protrusions, airflow passing through the surface of the fin is disturbed, the direction of the airflow is controlled, the airflow flows around the circumferential edge of the tube hole, the flow path of the airflow is prolonged, and the heat exchange efficiency of the fin is improved.)
1. A fin for a tube fin heat exchanger, the fin comprising a substrate, at least one tube hole unit formed in the substrate, the tube hole unit comprising a tube hole and a plurality of protrusions, the tube hole penetrating through the substrate in a thickness direction of the substrate, the plurality of protrusions being spaced apart from the tube hole on the substrate, wherein the plurality of protrusions each extend around the tube hole, and the plurality of protrusions are arranged in sequence in a radial direction of the tube hole.
2. The fin for a tube and fin heat exchanger as recited in claim 1, wherein the plurality of projections comprises: first protrusions and second protrusions alternately arranged in a radial direction of the tube hole, the first protrusions being formed by the base sheet protruding toward one side of the base sheet in a thickness direction, and the second protrusions being formed by the base sheet protruding toward the other side of the base sheet in the thickness direction.
3. The fin for a tube and fin heat exchanger according to claim 2, wherein two adjacent first projections and second projections are connected in a radial direction of the tube hole.
4. The fin for a tube and fin heat exchanger according to claim 3, wherein one end of the first protrusion is disposed to be staggered from one end of the adjacent second protrusion on the same side in a circumferential direction of the tube hole, and the other end of the first protrusion is disposed to be staggered from the other end of the adjacent second protrusion on the same side.
5. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the tube hole unit includes two protrusion sets, each of the two protrusion sets includes a plurality of the protrusions, the two protrusion sets are arranged symmetrically in a radial direction of the tube hole, and the two protrusion sets are located on both sides of the tube hole in a length direction of the base sheet, respectively.
6. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the cross-sectional profile of the protrusion is semicircular, semi-elliptical or triangular.
7. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the protrusion extends along an arc in a circumferential direction of the tube hole.
8. The fin for a tube and fin heat exchanger according to claim 7, wherein the tube hole is a circular hole, the protrusion extends along a circular arc line, and the center of the protrusion coincides with the center of the tube hole.
9. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the protrusion extends from a windward side of the tube hole to a leeward side of the tube hole in a flow direction of an air flow.
10. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the protrusion is formed by protruding one side surface of the base sheet in the thickness direction toward the other side surface of the base sheet in the thickness direction, and both ends of the protrusion in the extending direction are disconnected from the base sheet.
11. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein the tube hole unit further includes a rib provided radially outside the plurality of projections, the rib extending along a straight line parallel to a flow direction of the air flow.
12. The fin for a tube and fin heat exchanger according to any one of claim 11, wherein adjacent two of the ribs of adjacent two of the tube hole units are connected in a direction perpendicular to a flow direction of the air flow.
13. The fin for a tube and fin heat exchanger according to any one of claims 1 to 4, wherein a plurality of tube hole units are formed on the base sheet,
the plurality of pipe hole units are formed in a row which is uniformly arranged at intervals along the length direction of the substrate; or
The plurality of pipe hole units are formed into two rows arranged at intervals along the width direction of the substrate, each of the two rows of pipe hole units comprises a plurality of pipe hole units evenly arranged at intervals along the length direction of the substrate, and the plurality of pipe hole units of the two rows of pipe hole units are arranged in a staggered mode along the length direction of the substrate.
14. A tube and fin heat exchanger, characterized in that it comprises a fin for a tube and fin heat exchanger according to any one of claims 1 to 13.
15. An air conditioner comprising the tube and fin heat exchanger of claim 14.
Technical Field
The invention relates to the technical field of household appliances, in particular to a fin for a tube-fin heat exchanger, the tube-fin heat exchanger with the fin and an air conditioner with the fin.
Background
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a fin for a tube fin heat exchanger, which can enhance the heat exchange performance of the surface of the tube fin heat exchanger fin.
The invention also provides a tube-fin heat exchanger with the fin.
The invention also provides an air conditioner with the tube-fin heat exchanger.
The fin according to the first aspect of the present invention includes a base sheet, at least one tube hole unit is formed in the base sheet, the tube hole unit includes a tube hole and a plurality of protrusions, the tube hole penetrates through the base sheet in a thickness direction of the base sheet, the plurality of protrusions and the tube hole are arranged on the base sheet at intervals, the plurality of protrusions each extend around the tube hole, and the plurality of protrusions are sequentially arranged in a radial direction of the tube hole.
According to the fin for the tube-fin heat exchanger, the plurality of bulges extending along the circumferential direction of the tube hole are formed on the substrate around the tube hole on the substrate and are sequentially arranged along the radial direction of the tube hole, so that the plurality of bulges can increase the surface area of the fin, disturb airflow passing through the surface of the fin, control the airflow direction, enable the airflow to flow around the circumference of the tube hole, prolong the flow path of the airflow, and improve the heat exchange efficiency of the fin.
Further, the plurality of protrusions includes: first protrusions and second protrusions alternately arranged in a radial direction of the tube hole, the first protrusions being formed by the base sheet protruding toward one side of the base sheet in a thickness direction, and the second protrusions being formed by the base sheet protruding toward the other side of the base sheet in the thickness direction.
Further, in the radial direction of the pipe hole, two adjacent first protrusions and second protrusions are connected.
According to some embodiments of the invention, in the circumferential direction of the pipe hole, one end of the first protrusion is arranged to be offset from one end of the adjacent second protrusion on the same side, and the other end of the first protrusion is arranged to be offset from the other end of the adjacent second protrusion on the same side.
In some embodiments, the pipe hole unit includes two protrusion sets, each of the two protrusion sets includes a plurality of protrusions, the two protrusion sets are symmetrically arranged in a radial direction of the pipe hole, and the two protrusion sets are respectively located on both sides of the pipe hole in a length direction of the base sheet.
In some embodiments, the cross-sectional profile of the protrusion is semi-circular, semi-elliptical, or triangular.
According to some embodiments of the invention, the projection extends along an arc in a circumferential direction of the pipe bore.
Furthermore, the pipe hole is a circular hole, the protrusion extends along an arc line, and the center of the protrusion coincides with the center of the pipe hole.
According to some embodiments of the invention, the protrusion extends from a windward side of the duct hole to a leeward side of the duct hole in a flow direction of the airflow.
In a specific embodiment, the protrusion is formed by protruding one side surface of the base sheet in the thickness direction toward the other side surface of the base sheet in the thickness direction, and both ends of the protrusion in the extending direction are disconnected from the base sheet.
According to some embodiments of the invention, the duct hole unit further includes a rib provided radially outside the plurality of protrusions, the rib extending along a straight line parallel to a flow direction of the air flow.
Further, in the direction perpendicular to the flowing direction of the air flow, two adjacent ribs of two adjacent pipe hole units are connected.
According to some embodiments of the present invention, the substrate is formed with a plurality of pipe hole units formed in a row uniformly spaced along a length direction of the substrate; or the plurality of pipe hole units are formed into two rows arranged at intervals along the width direction of the substrate, each two rows of pipe hole units comprise a plurality of pipe hole units uniformly arranged at intervals along the length direction of the substrate, and the plurality of pipe hole units of the two rows of pipe hole units are arranged in a staggered manner along the length direction of the substrate.
A tube and fin heat exchanger according to a second aspect of the invention comprises a fin for a tube and fin heat exchanger according to the first aspect of the invention.
According to the tube-fin heat exchanger disclosed by the invention, the heat exchange performance of the heat exchanger can be enhanced and the heat exchange efficiency is improved by arranging the fins in the first aspect.
An air conditioner according to a third aspect of the present invention includes the tube and fin heat exchanger according to the second aspect of the present invention.
According to the air conditioner, the tube-fin heat exchanger in the second aspect is arranged, so that the heating or cooling efficiency of the air conditioner is improved, and meanwhile, energy can be saved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic view of a fin according to a first embodiment of the present invention, wherein the fin has a semicircular convex cross section;
FIG. 2 is a schematic view of a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of a fin according to a second embodiment of the present invention having a triangular cross-section;
FIG. 4 is a schematic view of a cross-sectional view taken along line B-B of FIG. 3;
FIG. 5 is a schematic view of a fin having an array of tube hole cells;
FIG. 6 is a schematic view of a fin having two rows of tube hole cells;
FIG. 7 is a schematic diagram showing the heat transfer capacity and pressure loss of the fin and the flat fin shown in FIG. 1 in comparison with different incoming wind speeds;
FIG. 8 is a schematic diagram illustrating heat transfer and pressure loss comparison between the fins and louvers of FIG. 1 at different incoming wind speeds;
FIG. 9 is a graph showing a comparison of heat transfer performance between the fin of FIG. 1 and flat and louvered fins, with the abscissa representing the friction factor f multiplied by the Reynolds number Re3The ordinate is the heat transfer rate ratio Q/Q0;
FIG. 10 is a graph showing a comparison of heat transfer performance between the fin of FIG. 1 and flat, louvered fins, plotted on the abscissa of the friction factor f times the Reynolds number Re3Divided by the nussel number Nu, the ordinate is the area ratio;
FIG. 11 is a graph showing a comparison of heat transfer performance between the fin and flat sheet and louver shown in FIG. 3, with the abscissa representing the friction factor f multiplied by the Reynolds number Re3The ordinate is the heat transfer rate Q/Q0;
FIG. 12 is a graph showing a comparison of heat transfer performance between the fin of FIG. 3 and flat and louvered fins, with the abscissa representing the friction factor f multiplied by the Reynolds number Re3Divided by the nussel number Nu, the ordinate is the area ratio.
Reference numerals:
the fins 100 are formed in a shape of a circular ring,
the number of the substrates 1 is such that,
the pipe hole unit 2 is formed in a pipe hole unit,
pipe hole 21
The set of protrusions 22, the first protrusion 221, the first side 2211, the second side 2212, the second protrusion 222, the third side 2221, the fourth side 2222,
and a rib 23.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A fin 100 for a tube and fin heat exchanger according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 6.
As shown in fig. 1, a fin 100 according to an embodiment of the first aspect of the present invention includes: the substrate 1, specifically, the substrate 1 is formed with at least one tube hole unit 2, each tube hole unit 2 including a tube hole 21 and a plurality of protrusions (e.g., a first protrusion 221 and a second protrusion 222 described below), wherein the tube hole 21 may be used for mounting a heat exchange tube, the plurality of protrusions extend in a circumferential direction of the tube hole 21, and the plurality of protrusions are sequentially arranged in a radial direction of the tube hole 21. That is, the substrate 1 may be formed with one pore unit 2, or may be formed with two or more pore units 2, each pore unit 2 including one pore 21 and a plurality of protrusions. The tube hole 21 penetrates through the substrate 1 in the thickness direction of the substrate 1, a plurality of protrusions and the tube hole 21 are arranged on the substrate 1 at intervals, each protrusion extends around the tube hole 21, and the plurality of protrusions are sequentially arranged along the radial direction (the left-right direction shown in fig. 1) of the corresponding tube hole 21. Thus, when the airflow passes through the surface of the fin 100, the plurality of protrusions can not only improve the heat exchange efficiency by disturbing the airflow passing through the fin 100; the direction of the airflow can be controlled, so that the airflow flows around the periphery of the pipe hole 21, the flow path of the airflow is prolonged, and the heat exchange efficiency is improved; in addition, the plurality of protrusions can also increase the surface area of the fin 100, thereby increasing the heat exchange area and improving the heat exchange efficiency.
According to the fin 100 for the tube fin heat exchanger, the plurality of protrusions are arranged on the peripheral edge of the tube hole 21, extend along the peripheral edge of the tube hole 21 and are sequentially arranged along the radial direction of the tube hole 21, so that the plurality of protrusions can increase the surface area of the fin 100, disturb airflow passing through the surface of the fin 100, control the airflow direction, enable the airflow to flow around the peripheral edge of the tube hole 21, prolong the flow path of the airflow, and improve the heat exchange efficiency of the fin 100.
Further, the plurality of protrusions may include: first projections 221 and second projections 222, the first projections 221 and the second projections 222 being alternately arranged along a radial direction (a left-right direction shown in fig. 1) of the tube hole 21, the first projections 221 being formed by the substrate 1 projecting toward one side of the substrate 1 in a thickness direction (an up-down direction shown in fig. 2), the second projections 222 being formed by the substrate 1 projecting toward the other side of the substrate 1 in the thickness direction. That is, the first projection 221 and the second projection 222 on the substrate 1 are formed to project toward both sides in the thickness direction of the substrate 1, respectively. At this time, one of the first protrusion 221 and the second protrusion 222 is formed as a protrusion and the other is formed as a recess, as viewed from one side of the substrate 1 in the thickness direction. Therefore, the turbulence effect of the fins 100 on the air flow flowing through the two surfaces in the thickness direction can be further enhanced, the boundary layer of the air can be better damaged, and the heat exchange efficiency can be improved.
For example, as shown in fig. 2, the first protrusion 221 may be formed by protruding upward from the substrate 1, and the second protrusion 222 may be formed by protruding downward from the substrate 1. Therefore, the upper surface and the lower surface of the substrate 1 can exchange heat with the air flow, and the heat exchange efficiency is improved.
It is understood that a plurality of first protrusions 221 and a plurality of second protrusions 222 may be provided at the circumferential edge of each pipe hole 21, the plurality of first protrusions 221 and the plurality of second protrusions 222 are alternately arranged, that is, the plurality of first protrusions 221 and the plurality of second protrusions 222 are arranged along the circumferential edge of the same pipe hole 21, and the first protrusion 221 is formed between two second protrusions 222 and the second protrusion 222 is formed between two first protrusions 221. Thereby, both surfaces of the fin 100 in the thickness direction can be made to uniformly disturb and transfer heat.
Further, in the radial direction of the pipe hole 21, two adjacent first protrusions 221 and second protrusions 222 are connected. For example, referring to fig. 1 and 2, in a radially outward direction of the pipe hole 21, the first protrusion 221 has a first side 2211 and a second side 2212 which are oppositely arranged, the second protrusion 222 has a third side 2221 and a fourth side 2222 which are oppositely arranged, and between the adjacent first protrusion 221 and second protrusion 222, if the first protrusion 221 is located at a radially inner side of the second protrusion 222, the second side 2212 is connected to the third side 2221, in other words, the second side 2212 of the first protrusion 221 is overlapped with the third side 2221 of the second protrusion 222; if the first protrusion 221 is located radially outward of the second protrusion 222, the fourth side 2222 of the second protrusion 222 is connected to the first side 2211 of the first protrusion 221, in other words, the fourth side 2222 is coincident with the first side 2211. Thus, the plurality of first protrusions 221 and the plurality of second protrusions 222 can be jointly formed into a corrugated surface, so that the area of the substrate 1 can be saved, more protrusions are arranged, and the joint of the first protrusions 221 and the second protrusions 222 can be smoothly connected, so that the number of edges and corners on the surface of the fin 100 is reduced, and the purpose of reducing the resistance of the surface of the fin 100 to fluid is achieved. In addition, the turbulent flow effect on flowing air can be further improved, and the heat exchange efficiency is improved.
According to an embodiment of the present invention, in the circumferential direction of the pipe hole 21, one end of the first protrusion 221 is disposed to be offset from one end of the adjacent second protrusion 222 on the same side, and the other end of the first protrusion 221 is disposed to be offset from the other end of the adjacent second protrusion 222 on the same side. Therefore, the processing and forming can be facilitated, and the production cost can be reduced.
For example, as shown in fig. 5, the first protrusions 221 and the second protrusions 222 are symmetrically arranged on the substrate 1 about a central axis of the substrate 1 along the length direction (left-right direction shown in fig. 5), and an arc length formed by extending the first protrusions 221 along the circumference of the tube hole 21 may be greater than an arc length formed by extending the second protrusions 222 along the circumference of the tube hole 21, at this time, the front ends of the first protrusions 221 exceed the front ends of the plurality of second protrusions 222, and the rear ends of the first protrusions 221 exceed the rear ends of the plurality of second protrusions 222, that is, two ends of the first protrusions 221 are staggered from two ends of the adjacent second protrusions 222, respectively, so that, in the process of forming the first protrusions 221 and the second protrusions 222 by punching, the punching slits at two ends of the first protrusions 221 may not be connected with the punching slits at two ends of the second protrusions 222, thereby facilitating the processing and forming.
According to some embodiments of the present invention, referring to fig. 5, the tube hole unit 2 includes two protrusion sets 22, each of the two protrusion sets 22 includes a plurality of protrusions, the two protrusion sets 22 are symmetrically arranged in a radial direction of the tube hole 21, and the two protrusion sets are respectively located on both sides of the tube hole 21 in a length direction of the substrate (a left-right direction shown in fig. 5). Therefore, the arrangement of the protrusions on the substrate 1 can be more compact, and the turbulent flow effect is better.
For example, as shown in fig. 5, one protrusion group 22 is provided on the left side of the pipe hole 21 in the radial direction thereof (the left-right direction shown in fig. 5), another protrusion group 22 is provided on the right side of the pipe hole 21 in the radial direction thereof (the left-right direction shown in fig. 5), the two protrusion groups 22 are arranged bilaterally symmetrically with respect to the diameter of the pipe hole 21 in the direction perpendicular to the length direction of the substrate 1, each of the two protrusion groups 22 includes a plurality of first protrusions 221 and a plurality of second protrusions 222, and the first protrusions 221 and the second protrusions 222 in each protrusion group 22 are alternately arranged. Therefore, both sides of each tube hole 21 can realize turbulent flow, and the air flow field and the temperature field on the surface of the whole fin 100 can be uniformly distributed, so that the heat exchange efficiency is improved.
Further, the cross-sectional profile of the protrusion is semi-circular, semi-elliptical, or triangular. Specifically, the cross-sectional profile of the first protrusion 221 may be formed in a semicircular shape, a semi-elliptical shape, or a triangular shape, the cross-sectional profile of the second protrusion 222 may also be formed in a semicircular shape, a semi-elliptical shape, or a triangular shape, and the cross-sectional profile of the first protrusion 221 is the same as the cross-sectional profile of the second protrusion 222. Therefore, the cross section profiles of the plurality of bulges can be connected to form the corrugations with the same wave crests and wave troughs, the disturbance to airflow can be enhanced by the corrugated surfaces, the air boundary layer can be better damaged, and the heat exchange efficiency is increased. Furthermore, the cross-sectional profile of the protrusion may also be semi-elliptical or triangular.
For example, as shown in fig. 2, the cross-sectional profile of the first protrusion 221 is formed in a semicircular shape, and the cross-sectional profile of the second protrusion 222 is also formed in a semicircular shape. As also shown in fig. 4, the cross-sectional profile of the first protrusion 221 may be formed in a triangular shape, and the cross-sectional profile of the second protrusion 222 may also be formed in a triangular shape.
Preferably, the cross-sectional profile of the first protrusion 221 and the cross-sectional profile of the second protrusion 222 are both formed in a semicircular shape, so that the surface formed by the plurality of protrusions can be a smooth arc surface, thereby reducing the resistance of the surface of the fin 100 to the airflow.
Further, the protrusion extends along an arc line in the circumferential direction of the pipe hole 21. For example, the protrusion may be formed in a ring shape along an arc in the circumferential direction of the pipe hole 21, wherein the ring shape may be a circular ring shape, an elliptical ring shape, or other irregular ring shape; the protrusion may also extend along an arc to form an arc segment, wherein the arc segment may be an arc segment, an elliptical arc segment, or other irregular arc segment. Alternatively, when the protrusions extend as arc sections, both ends of the chord length corresponding to the protrusions extending along the arc lines exceed both ends of the diameter of the pipe hole 21 parallel to the chord length. Thus, when the heat exchange tube passes through the tube hole 21 and is connected with the substrate 1, if an air flow passes through the heat exchanger, the air flow is divided on the surface of the heat exchange tube, at this time, the bulge can guide the air flow flowing along the width direction of the fin 100 from the windward side of the heat exchange tube (for example, the rear side of the fin 100 shown in fig. 1) to the leeward side of the heat exchange tube (for example, the front side of the fin 100 shown in fig. 1), so that the loss of wind power is reduced, the size of a wake zone of the air flow on the leeward side of the heat exchange tube can be reduced to a certain extent, and the convective heat transfer strength between the air on the.
In a specific embodiment, as shown in fig. 5, the pipe hole 21 may be formed as a circular hole, the protrusions extend along a circular line to form a circular arc segment, the centers of the plurality of protrusions coincide with the center of the pipe hole 21, and the plurality of protrusions form concentric circular arc segments. Thereby, on the one hand, the assembly of the fin 100 with a conventional heat exchange tube can be facilitated, and on the other hand, the plurality of protrusions can be formed as a corrugated surface with high efficiency and low resistance.
In a specific example, as shown in fig. 1, among the plurality of protrusions of the orifice unit 2, the protrusion 12 farthest from the orifice 21 may be formed in a multi-stage structure. For example, as shown in fig. 1, the protrusion farthest from the tube hole 21 is a first protrusion 221, the first protrusion 221 includes two segments arranged at intervals in the circumferential direction of the tube hole 21, and the two segments of the first protrusion 221 are respectively connected to two ends in the circumferential direction of the second protrusion 222 on the secondary outer layer among the plurality of protrusions. That is, the two segments of the outermost first protrusion 221 may be formed by removing the middle arc segment from the other first protrusions 221 of the plurality of protrusions. And the distance between the arc where the two first protrusions 221 are located and the center of the pipe hole 21 is equal, and the two first protrusions 221 oppositely extend along the arc line where the two first protrusions are located to form a section of complete first protrusion 221, so that the process can be simplified, the processing is convenient, the structure of a plurality of protrusions between two adjacent pipe holes 21 is compact, and the turbulent flow effect is enhanced.
Further, the protrusions extend from the windward side of the tube hole 21 to the leeward side of the tube hole 21 in the flow direction of the airflow. Therefore, when the airflow flows through the fin 100, the bulge can guide the airflow blown from the windward side of the heat exchange tube to the leeward side of the heat exchange tube, so that the contact area between the fin 100 and the airflow is increased, the size of a wake region of the airflow on the leeward side of the heat exchange tube is reduced, the convection heat transfer strength between the airflow on the leeward side of the heat exchange tube and the surface of the fin 100 is enhanced, and the heat exchange performance is improved.
For example, as shown in fig. 1, when the flow direction of the air flow is the front-rear direction shown in fig. 1, one of the front side and the rear side of the fin 100 is a windward side, and the other side is a leeward side, that is, when the rear side of the substrate 1 is the windward side, the front side of the substrate 1 is the leeward side, and when the front side of the substrate 1 is the windward side, the rear side of the substrate 1 is the leeward side. Further, the protrusion is an arc section extending around the circumference of the tube hole 21, one end of the protrusion is close to the rear side edge of the substrate 1, and the other end of the protrusion is close to the front side edge of the substrate 1, so that when the fin 100 is assembled on the heat exchange tube, the protrusion on the fin 100 can guide the airflow along the width direction of the fin 100 from one side of the heat exchange tube (for example, the rear side of the fin 100 shown in fig. 1) to the other side (for example, the front side of the fin 100 shown in fig. 1), thereby reducing the obstruction of the heat exchange tube to the airflow, reducing the loss of wind power, increasing the contact area of the heat exchange tube and the airflow, and improving the heat exchange performance.
Further, the projection is formed by projecting one side surface of the substrate 1 in the thickness direction toward the other side surface of the substrate 1 in the thickness direction, and both ends of the projection in the extending direction are disconnected from the substrate 1. Therefore, the protrusions can be conveniently formed on the substrate 1 by stamping, and meanwhile, the airflow can conveniently flow into the airflow channel limited by the protrusions from the openings, so that the pressure drop generated when the airflow flows through the surfaces of the protrusions is reduced, and the heat exchange performance of the fin 100 is improved.
Specifically, as shown in fig. 2 in combination with fig. 1, the first protrusion 221 is formed by protruding the substrate 1 upward, and the first protrusion 221 is disconnected from the substrate 1 at both ends in the circumferential direction of the pipe hole 21 and is formed with a first slit, which may have the same shape as the cross-sectional profile of the first protrusion 221. The second protrusion 222 is formed by protruding the base sheet downward, and the second protrusion 222 is disconnected from the base sheet 1 at both ends in the circumferential direction of the tube hole 21 and is formed with a second slit having the same shape as the cross-sectional profile shape of the second protrusion 222. Therefore, the slits of the present embodiment can generate more severe disturbance to the fluid, so that the effect of the fins 100 on breaking the air boundary layer is better, which is helpful for reducing the pressure drop when the air flow flows through the surface of the protrusions, and meanwhile, the air flow can conveniently flow into the air flow channel limited by the protrusions from the slits, and the heat exchange performance of the fins 100 is improved.
In addition, of the plurality of projections extending along the peripheral edge of the same tube hole 21, the two first slits of the first projection 221 closest to the tube hole 21 in the extending direction may be both provided obliquely with respect to the longitudinal direction and the width direction of the substrate 1.
Specifically, as shown in fig. 5, a plane of the first slit located on the rear side of the first protrusion 221 is coplanar with a plane defined by the central axis of the pipe hole 21 along the rear end of the first protrusion 221, and a plane of the first slit located on the front side of the first protrusion 221 is coplanar with a plane defined by the central axis of the pipe hole 21 along the front end of the first protrusion 221.
Further, two first slits of the other first protrusions 221 of the plurality of protrusions may each extend perpendicular to the direction of the flow direction of the air flow, and two second slits of the plurality of second protrusions 222 may also each extend perpendicular to the direction of the flow direction of the air flow. Thus, when the air flow flows from one side of the fin 100 (the rear side of the fin 100 shown in fig. 5) to the other side (the front side of the fin 100 shown in fig. 5), the first protrusion 221 may guide the air flow at the windward side of the heat exchange tube to the leeward side of the heat exchange tube, and the remaining protrusions may guide the air flow between the adjacent two heat exchange tubes from the windward side of the fin 100 to the leeward side of the fin 100.
Compared with the prior art that the lantern ring is arranged on the periphery of the pipe hole, the single annular protrusion without the seam surrounding the lantern ring is formed on the fin, the annular protrusion only protrudes towards one side of the fin, the linear section type seam protrusions are arranged at intervals on the edges of the two long edges of the substrate, the seam protrusions extend perpendicular to the airflow flowing direction, and the seam direction deviates to the round hole. In addition, the circular ring-shaped bulge in the technical scheme only protrudes to one side of the fin, the effect of disturbance and drainage can be only achieved on the air flow on the single side of the fin, and the strengthening effect is limited.
In the embodiment, the first protrusion 221 and the second protrusion 222 which are connected in a concave-convex manner are arranged on the surface of the substrate 1 to form a corrugated flow guide surface to guide fluid, and no additional sleeve ring component is needed to be arranged, so that the structure is simpler, the processing is convenient, the fluid can be guided to the leeward side of the heat exchange tube by the protrusions from the windward side of the heat exchange tube, the size of an airflow wake zone on the leeward side of the heat exchange tube is reduced to a certain extent, and the convection heat exchange strength between the air on the leeward side of the heat exchange tube and the surface of the fin 100 is enhanced. Meanwhile, the two ends of each protrusion are provided with the slots facing the air flow, so that severe disturbance can be generated on the fluid, the effect of damaging the air boundary layer of the fin 100 is better, all the protrusions on the fin 100 can be punched to form the slots, and the overall turbulence effect on the air flow can be further enhanced.
According to some embodiments of the present invention, in conjunction with fig. 1 and 5, the pipe-hole unit 2 may further include: the ribs 23 are provided radially outward of the plurality of projections, and the ribs 23 may extend along a straight line parallel to the flow direction of the gas flow (e.g., the front-rear direction shown in fig. 5). Therefore, the disturbance of the surface of the fin 100 to the airflow can be further enhanced, the heat transfer is enhanced, and the heat exchange efficiency of the fin 100 is improved.
Further, referring to fig. 1 to 6, in a direction perpendicular to the flow direction of the air flow (for example, the left-right direction shown in fig. 6), two adjacent ribs 23 of two adjacent pipe hole units 2 are connected. Therefore, the structure of the plurality of pipe hole units 2 on the fin 100 can be compact, the disturbance of the fin 100 to the airflow is further enhanced, the heat transfer is enhanced, and the heat exchange efficiency is improved.
For example, as shown in fig. 6, two ribs 23 are formed in the middle of the connection line of the hole centers of the hole holes 21 of two adjacent hole units 2, and the two ribs 23 are arranged side by side left and right, wherein the rib 23 located on the left side is disposed on the right side of the rightmost arc-shaped protrusion of the hole unit 2 on the left side, the rib 23 located on the right side is located on the left side of the leftmost arc-shaped protrusion of the hole unit 2 on the right side, and the rib 23 extends along the front-back direction, and the two ribs 23 are connected in the left-right direction, the cross-sectional profiles of the two connected ribs 23 may be formed into a semi-circle, a semi-ellipse, or a triangle, and the cross-sectional profiles of the two connected ribs 23 may be the same as the cross-sectional profile of. Therefore, the arrangement of the convex ribs 23 can further enhance the disturbance of the fins 100 to the air flow, enhance the heat transfer and improve the heat exchange efficiency.
According to an embodiment of the present invention, as shown in fig. 5, the substrate 1 may have a rectangular shape, the substrate 1 may have a plurality of pipe hole units 2 formed thereon, and the plurality of pipe hole units 2 may be formed in a row uniformly spaced along a length direction (a left-right direction as shown in fig. 5) of the substrate 1.
In other embodiments of the present invention, as shown in fig. 6, the plurality of pipe hole units 2 may be formed in two rows arranged at intervals in the width direction of the substrate 1 (the front-back direction shown in fig. 6), each of the two rows of pipe hole units 2 includes a plurality of pipe hole units 2 arranged at regular intervals in the length direction of the substrate 1 (the left-right direction shown in fig. 6), and the plurality of pipe hole units 2 in the two rows of pipe hole units 2 are arranged in a staggered manner in the length direction of the substrate 1. Therefore, the heat exchange tube can connect the plurality of fins 100 conveniently, the heat transfer performance of the fins 100 can be enhanced, and the heat exchange efficiency is improved.
For example, as shown in fig. 6, the substrate 1 may be provided with two rows of pipe hole units 2: first tube hole unit group and second tube hole unit group, first tube hole unit group and second tube hole unit group set up at the interval in the front and back direction, first tube hole unit group and second tube hole unit group all include a plurality of tube hole units 2, a plurality of tube hole units 2 on the first tube hole unit group all follow the even interval arrangement of length direction of substrate 1, a plurality of tube hole units 2 on the second tube hole unit group all follow the even interval arrangement of length direction of substrate 1, every tube hole 21 on the first tube hole unit group is all on the perpendicular bisector of the hole heart line of two adjacent tube holes 21 of second tube hole unit group, every tube hole 21 on the second tube hole unit group is also all on the perpendicular bisector of the hole heart line of two adjacent tube holes 21 of first tube hole unit group, thereby the heat exchange tube of being convenient for connects a plurality of fins 100, and simultaneously, the heat exchange efficiency of fin 100 is promoted.
A tube and fin heat exchanger according to a second aspect of the invention is described below.
The tube and fin heat exchanger according to the second aspect embodiment of the present invention includes the fin 100 according to the first aspect of the present invention. For example, a heat exchange tube may be serially connected to a plurality of fins 100 according to the present invention arranged side by side in sequence, thereby forming a complete tube and fin heat exchanger, which may be an evaporator and/or a condenser.
Other constructions, such as heat exchange tubes, etc., and operations of tube and fin heat exchangers according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
According to the tube-fin heat exchanger disclosed by the embodiment of the second aspect of the invention, by arranging the fin 100 disclosed by the first invention, the heat exchange performance of the tube-fin heat exchanger can be improved, and good use experience is brought.
A tube and fin heat exchanger according to one embodiment of the present invention will be described with reference to fig. 1 to 12.
