阅读说明：本技术 用于换热器的散热翅片、散热组件和制冷设备 (Cooling fin for heat exchanger, cooling assembly and refrigeration equipment ) 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换热器的散热翅片、散热组件和制冷设备,所述散热翅片包括：基片,所述基片上设置有多个在垂直于空气流向的方向上间隔开的翅片管孔；多个桥片组,多个所述桥片组设置在相邻的两个所述翅片管孔之间,且相邻的两个所述桥片组间隔设以限定出第一空气流路。根据本发明实施例的用于换热器的散热翅片,利用桥片组破坏流动边界层,提高了空气侧对流传热系数,增强了传热效果,使换热器具有更好的换热性能。(The invention discloses a radiating fin, a radiating assembly and refrigeration equipment for a heat exchanger, wherein the radiating fin comprises: a substrate having a plurality of fin tube holes spaced apart in a direction perpendicular to a flow direction of air; the plurality of bridge plate groups are arranged between two adjacent fin tube holes, and the two adjacent bridge plate groups are arranged at intervals to define a first air flow path. According to the radiating fin for the heat exchanger, the bridge fin group is utilized to destroy the flowing boundary layer, so that the convection heat transfer coefficient of the air side is improved, the heat transfer effect is enhanced, and the heat exchanger has better heat exchange performance.)

1. A fin for a heat exchanger, comprising:

a substrate having a plurality of fin tube holes spaced apart in a direction perpendicular to a flow direction of air;

the plurality of bridge plate groups are arranged between two adjacent fin tube holes, and the two adjacent bridge plate groups are arranged at intervals to define a first air flow path.

2. The fin for a heat exchanger as claimed in claim 1, wherein each of the bridge piece groups comprises: a plurality of bridges spaced in an air flow direction.

3. The fin for a heat exchanger according to claim 2, wherein in each of the groups of fins, the width of the fins on the downstream side is not smaller than the width of the fins on the upstream side.

4. The fin according to claim 2, wherein a gap between adjacent two of the fins in each of the fin groups is not less than 1 mm.

5. The fin for a heat exchanger according to claim 2, wherein each of the fins includes:

a first side wall and a second side wall formed on the substrate and facing each other in a direction perpendicular to an air flow direction;

a top wall connected between the free ends of the first and second side walls; wherein

A first opening is defined between one end of the first side wall, the second side wall and the top wall on the same side and the substrate, and a second opening is defined between the other end of the first side wall, the second side wall and the top wall on the same side and the substrate.

6. The fin for a heat exchanger of claim 5, wherein the first sidewall and the second sidewall are gradually closer together in a direction away from the base sheet.

7. The fin according to claim 5, wherein the included angle between the first sidewall and the base sheet and the included angle between the second sidewall and the base sheet are β, the length of the top wall is S, and β satisfies: beta is more than or equal to 30 degrees and less than or equal to 60 degrees, and S satisfies the following conditions: s is more than or equal to 1mm and less than or equal to 4 mm.

8. The fin for a heat exchanger as recited in claim 1 wherein the peripheral edge of the fin tube hole is spaced from the adjacent group of bridges to form a second air flow path.

9. The fin for a heat exchanger of claim 8, wherein the second air flow path is configured in an arc and at least partially surrounds the fin tube bore.

10. The fin for a heat exchanger as recited in claim 1, wherein a distance between adjacent two of the finned tube holes is 10mm to 25 mm.

11. A heat sink assembly, comprising: a plurality of the fin according to any one of claims 1 to 10, the plurality of fins being arranged in series in an air flow direction.

12. The heat dissipation assembly of claim 11, wherein the plurality of fin tube apertures of one of the substrates and the plurality of fin tube apertures of the other substrate are staggered between two adjacent substrates.

13. The heat dissipating assembly of claim 12, wherein the distance between the line connecting the centers of the plurality of fin tube holes in one of the substrates and the line connecting the centers of the plurality of fin tube holes in the other substrate is 10mm to 28mm between two adjacent substrates.

14. A refrigeration appliance comprising a heat sink assembly as claimed in any one of claims 11 to 13.

Technical Field

The invention relates to the technical field of fin heat dissipation, in particular to a heat dissipation fin for a heat exchanger, a heat dissipation assembly and refrigeration equipment.

Background

The main purpose of the heat exchanger is to exchange heat by means of temperature difference. The heat exchanger is an important component in the air conditioning system, and the heat exchange and resistance performance of the heat exchanger have important influence on the energy efficiency and the cost of the air conditioning system.

At present, an evaporator and a condenser in an air conditioning system are generally designed as a tube-fin heat exchanger, and fins with various shapes are generally sleeved outside a tube in order to improve air-side heat transfer. The development process of the enhanced heat transfer of the fins can be divided into three stages: the first generation of fins are flat fins and corrugated fins, also called surface continuous fins, and mainly increase the heat exchange amount by increasing the heat exchange area; the second generation of fins are louver and slotted fins, also called discontinuous fins, and mainly enhance heat exchange by continuously destroying the fluid boundary layer; the third generation fins are various vortex generator fins, and mainly generate longitudinal vortex secondary flow to delay boundary layer separation and strengthen heat transfer at the rear part of the tube body to enhance heat transfer. However, the first generation of fins have a weak effect of destroying the flow boundary layer to enhance heat transfer, and the heat dissipation effect is not good; the second generation of fins brings larger wind resistance, and the pump work can be increased due to the disturbance of the fluid; the third generation of fins has small heat transfer capacity in unit volume, and can not meet the large demands of evaporators and condensers for heat dissipation in air conditioners.

Bergels scholars indicate that the heat exchange performance of two or more reinforcement techniques used simultaneously is better than the heat exchange performance of one reinforcement technique used singly; the heat transfer can be enhanced by reducing the thickness of the boundary layer, the temperature gradient at the rear part of the heat exchange tube in the tube fin type heat exchanger is small, and the temperature speed synergy is poor.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

Therefore, the first objective of the present invention is to provide a heat dissipating fin for a heat exchanger, in which a bridge fin set can destroy a flow boundary layer, increase a heat transfer effect, and simultaneously introduce more fluid onto a heat exchange tube wall, delay the separation of the boundary layer, improve the temperature and speed synergy at the rear of the heat exchange tube, and further enhance the heat transfer effect.

The second objective of the present invention is to provide a heat dissipating assembly having the above heat dissipating fins.

The third purpose of the invention is to provide a refrigeration device with the heat dissipation assembly.

An embodiment according to a first aspect of the invention proposes a fin for a heat exchanger, comprising: a substrate having a plurality of fin tube holes spaced apart in a direction perpendicular to a flow direction of air; the plurality of bridge plate groups are arranged between two adjacent fin tube holes, and the two adjacent bridge plate groups are arranged at intervals to define a first air flow path.

According to the radiating fin for the heat exchanger, the bridge fin group is utilized to destroy the flowing boundary layer, so that the convection heat transfer coefficient of the air side is improved, the heat transfer effect is enhanced, and the heat exchanger has better heat exchange performance.

In addition, the heat dissipation fin for a heat exchanger according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention each said set of vanes comprises a plurality of vanes spaced apart in the air flow direction.

According to one embodiment of the present invention, in each of the bridge piece groups, the width of the bridge piece on the downstream side is not smaller than the width of the bridge piece on the upstream side.

According to one embodiment of the invention, the gap between two adjacent bridge pieces in each bridge piece group is not less than 1 mm.

According to one embodiment of the invention, each of said bridge pieces comprises: a first side wall and a second side wall formed on the substrate and facing each other in a direction perpendicular to an air flow direction; a top wall connected between the free ends of the first and second side walls; wherein a first opening is defined between one end of the first side wall, the second side wall and the top wall on the same side and the substrate, and a second opening is defined between the other end of the first side wall, the second side wall and the top wall on the same side and the substrate; the first sidewall and the second sidewall are gradually closer together in a direction away from the substrate.

According to an embodiment of the present invention, an included angle between the first sidewall and the substrate and an included angle between the second sidewall and the substrate are β, a length of the top wall is S, and β satisfies: beta is more than or equal to 30 degrees and less than or equal to 60 degrees, and S satisfies the following conditions: s is more than or equal to 1mm and less than or equal to 4 mm.

According to one embodiment of the invention, the peripheral edges of the finned tube holes are spaced from adjacent sets of the bridges to form second air flow paths.

According to one embodiment of the invention, the second air flow is configured to be arcuate and at least partially surrounds the fin tube holes.

According to one embodiment of the invention, the distance between two adjacent finned tube holes is 10mm-25 mm.

An embodiment according to a second aspect of the present invention proposes a heat dissipation assembly including the heat dissipation fins according to the embodiment of the first aspect of the present invention, the plurality of heat dissipation fins being arranged in order in an airflow direction.

According to one embodiment of the present invention, in two adjacent base sheets, the plurality of fin tube holes of one of the base sheets and the plurality of fin tube holes of the other base sheet are arranged alternately.

According to one embodiment of the invention, in two adjacent base sheets, the distance between the central connecting line of the plurality of fin tube holes on one base sheet and the central connecting line of the plurality of fin tube holes on the other base sheet is 10mm-28 mm.

According to a third aspect embodiment of the present invention, a refrigeration device is provided, which comprises the heat dissipation assembly of the second aspect embodiment of the present invention.

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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a heat dissipation assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a graph comparing the heat transfer performance of the present invention with that of a flat sheet, shutter;

FIG. 4 is a graph comparing the heat transfer performance of the present invention with that of a flat sheet and a louver under the same pumping operation.

Reference numerals:

the combination of the heat dissipating fins 100, the heat dissipating assembly 200,

the number of the substrates 1 is such that,

bridge piece set 2, bridge piece 21, first side wall 211, second side wall 212, top wall 213,

finned tube holes 3, first air flow channels 4, and second air flow channels 5.

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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A fin 100 for a heat exchanger according to an embodiment of the present invention, including a substrate 1 and a plurality of bridge plate groups 2, is described below with reference to fig. 1 to 2.

Specifically, the substrate 1 is provided with a plurality of fin tube holes spaced in a direction perpendicular to the air flow direction; a plurality of bridge plate groups 2 are arranged between two adjacent fin tube holes, and two adjacent bridge plate groups 2 are arranged at intervals to define a first air flow path 4.

According to the heat dissipation fin 100 for the heat exchanger, the bridge plate group 2 is utilized to destroy the flowing boundary layer, so that the convection heat transfer coefficient of the air side is improved, the heat transfer effect is enhanced, and the heat dissipation fin 100 has better heat exchange performance; the two bridge plate groups are separated to form the first air flow path, so that more fluid on the upstream side flows to the downstream side through the first air flow path.

Note that, with respect to one heat dissipation fin 100, a local region where the fluid enters the heat dissipation fin 100 is an upstream side; the local region where the fluid flows out of the heat radiation fin 100 is the downstream side.

In one embodiment of the invention, each bridge piece set 2 comprises a plurality of bridge pieces 21 spaced apart in the air flow direction; specifically, three bridge piece groups 2 are arranged on a horizontal line vertical to the air flow direction, and a plurality of bridge pieces 21 are arranged in each bridge piece group 2; the width of the bridge piece 21 on the downstream side of the heat dissipation fin 100 is larger than the width of the bridge piece 21 on the upstream side. According to the fluid principle, the thickness of the boundary layer is gradually increased from zero to the beginning along the flowing direction from the head of the flowing object; since the boundary layer on the downstream side of the air flow of the heat dissipation fin 100 is thick, in order to enhance heat transfer, increase the heat transfer area and fluid boundary layer disturbance; therefore, in the plurality of the bridge piece groups 2, the width of the plurality of the bridge pieces 21 on the upstream side is smaller than that of the last bridge piece 21 on the downstream side, and the width of the last bridge piece 2 is wider than that of the upstream side, so that on one hand, the heat transfer area of the tail part of the heat exchange tube can be increased, on the other hand, the disturbance of the tail part on a fluid boundary layer can be increased, and the heat dissipation effect on the downstream side is better.

Preferably, the gap between two adjacent bridge plate groups 2 in each bridge plate group is not less than 1mm according to the requirements of the processing technology. According to the relationship of properties such as stiffness strength and elastic limit of different materials, if the distance between two adjacent bridge piece groups 2 is too close, the substrate 1 is subjected to too large stretching on a local material of the substrate 1 due to too many stamping times in a unit area, the strength of a stamping part is reduced, the substrate 1 between the bridge piece groups 2 is easy to break, and material waste is caused; if the distance between two adjacent bridge plate groups 2 is too far, on one hand, the disturbance effect on the fluid boundary layer is reduced, and on the other hand, the heat transfer area is reduced, so that the heat transfer effect of the heat dissipation fin 100 is deteriorated.

Preferably, the top wall 213, the first side wall 211 and the second side wall 212 are formed like a bridge under the punching of the substrate 1 by the die. As shown in fig. 2 in particular, the first sidewall 211 and the second sidewall 212 are formed on the substrate 1 and face each other in a direction perpendicular to the air flow, and gradually approach each other in a direction away from the substrate 1; the top wall 213 defines a first opening between the free end of the first side wall 211 and the free end of the second side wall 212, the same side end of the first side wall 211, the second side wall 212 and the top wall 213 and the substrate 1, and the same side other end of the first side wall 211, the second side wall 212 and the top wall 213 and the substrate 1. The heat exchange tubes may dissipate heat from the slots due to the slots in the substrate 1 caused by the top wall 213, the first sidewall 211, and the second sidewall 212 being punched out, the location of the slots may disrupt the flow boundary layer, increasing heat transfer.

Preferably, in order to meet the requirement of the processing technology of the heat dissipation fin 100, the included angle between the first side wall 211 and the substrate 1 and the included angle β between the second side wall 212 and the substrate 1 satisfy 30 ° ≦ β ≦ 60 °; the length S of the top wall 213 satisfies that S is more than or equal to 1mm and less than or equal to 4 mm. According to the relationship between the stiffness strength, the elastic limit and other properties of different materials, if the angle beta and the length S of the top wall are too large, the substrate 1 is possibly cracked by the mold, so that the material is damaged; if the angle β and the top wall length S are too small, on the one hand, the disturbance effect on the fluid boundary layer is reduced, and on the other hand, the heat transfer area is reduced, so that the heat transfer effect of the heat dissipation fin 100 is deteriorated.

In one embodiment of the invention, the peripheral edge of the finned tube bore 3 is spaced from the adjacent set of fins 2 to form a second air flow path 5; the design of the second air flow path 5 around the heat exchange tube can not only take away a part of the fluid heated by the heat exchange tube, but also guide more fluid to the rear part of the heat exchange tube, delay the separation of the fluid boundary layer and enhance the heat transfer at the rear part of the heat exchange tube.

Specifically, in the three bridge piece groups 2, the two bridge piece groups 2 on the two sides and the middle bridge piece group 2 form two first air flow paths 4 pointing to the fin tube holes 3 to guide the fluid to flow to the periphery of the fin tube holes 3; such a design can make the fluid flow in the direction of the first air flow path 4, and the first air flow path 4 can make the resistance when the fluid flows reduced, making the fluid flow more easily to the downstream side.

Preferably, the second air flow path 5 is configured to be arcuate and at least partially surrounds the finned tube bore 3. Specifically, the edge of the bridge piece group 2 close to the fin tube hole 3 is arranged in an arc shape, and forms a second air flow path 5 with the fin tube hole 3. The upstream fluid is guided to the periphery of the finned tube hole 3 through the first air flow channels 4, and flows around from both the left and right sides of the finned tube hole 3 to continue to the downstream side. It is particularly noted that the edges of the bridge piece groups 2 close to the fin tube holes 3 are arranged in an arc shape, and because the cross section of the heat exchange tube is circular, the arc-shaped design can enable fluid to better flow around the periphery of the heat exchange tube, take away the fluid heated by the heat exchange tube, and achieve better heat dissipation effect.

Preferably, the distance between two adjacent finned tube holes 3 is 10mm to 25 mm. The fin tube holes 3 are too close to each other, so that heat of the heat exchange tubes is not easy to dissipate, and the heat dissipation effect of an evaporator or a condenser is poor, thereby causing damage to a machine due to overheating; the fin tube holes 3 are far away, so that the heat dissipation effect is good, but the size of the machine is inevitably increased, the manufacturing cost is increased, the occupied area of a refrigeration system is increased, the use is inconvenient, and the attractiveness is affected.

In the heat dissipating module 200 according to the embodiment of the present invention, the heat dissipating fins 100 for the heat exchanger as described above are used, and the plurality of heat dissipating fins 100 are sequentially arranged in the air flowing direction; the fin tube holes 3 on two adjacent substrates 1 are staggered, and the distance between the central connecting line of the fin tube holes 3 on one substrate 1 and the central connecting line of the fin tube holes 3 on the other substrate 1 is 10-28 mm. The fin tube holes 3 on the two substrates 1 are arranged in a staggered mode, so that fluid is easy to guide to flow through the first air flow path 4, the fluid flows to the fin tube holes 3 to form a second air flow path 5, more fluid can be guided into the wall surface of the heat exchange tube through the staggered arrangement, boundary layer separation is delayed, temperature and speed synergy at the rear part of the heat exchange tube is improved, and the heat transfer effect is enhanced.

In one embodiment of the invention, a certain cross-section velocity distribution vector diagram is simulated by CFD simulation under the same incoming flow velocity of 1 m/s.

In the simulation experiment, the plain film, the louver fins and the wake zone at the tube rear of the heat dissipation assembly 200 of the present invention were compared, respectively:

in the flat sheet, the heat exchange amount is improved mainly by increasing the heat exchange area, fluid flows through the finned tube holes 3 uniformly, and because the viscosity effect received by fluid particles in a boundary layer cannot be ignored, a larger tail flow area is arranged at the rear part of the finned tube holes 3, and the tail pipe at the downstream side has poor heat dissipation effect; in the louver fin, the heat exchange is enhanced mainly by continuously destroying the fluid boundary layer, the flow velocity of the fluid passing through the tube hole 3 of the fin is obviously larger than that of the flat sheet, the wake area is also smaller than that of the flat sheet, the heat dissipation effect of a tail pipe at the downstream side is improved, but the influence of poor heat dissipation of the tail pipe of the heat exchange tube caused by the wake area cannot be ignored; in the heat dissipation assembly 200, due to the wider action of the first air flow path 4, the second air flow path 5 and the tail bridge piece, fluid can be led to the tail of the heat exchange tube at the downstream side more easily, the opening seam is enlarged, the heat transfer area is increased, and the heat of the heat exchange tube at the tail is better transferred out of the opening seam; the experimental result proves that the flow speed and the flow of the fluid passing through the finned tube hole 3 are obviously larger than those of the flat fins and the louver fins, the tail flow area is almost not provided, the heat dissipation effect of the heat exchange tail tube at the downstream side is improved, and the heat transfer at the rear part of the heat exchange tube is enhanced.

In one embodiment of the present invention, as shown in FIG. 3, a graph comparing the heat transfer performance of the heat sink assembly 200 of the present invention with that of flat fins and louvered fins is shown. The abscissa is the Reynolds number Re, which represents the incoming flow rate, and the ordinate is the heat transfer factor j. As can be seen from fig. 3, the heat dissipating assembly 200 of the present invention has a heat transfer capability 49% -71% higher than that of the flat fins and a heat transfer capability 12% -16% higher than that of the louver fins at different incoming flow speeds, i.e., different reynolds numbers Re. It is proved that the heat dissipation assembly 200 of the present invention has a heat transfer performance superior to that of the flat sheet and the louver by combining various reinforcement techniques.

In one embodiment of the present invention, as shown in FIG. 4, a graph comparing the performance of the heat sink assembly 200 of the present invention with flat fins and louvered fins at the same pumping work is shown. The abscissa is the Reynolds number Re, which represents the incoming flow rate, and the ordinate is the pump work. In the range of investigation, the invention has the heat transfer performance which is 15-40% higher than that of the flat plate and 10-17% higher than that of the louver fin. Through the analysis, the invention utilizes the principle of enhanced heat transfer, and the heat transfer performance is greatly improved compared with the conventional flat sheet and louver fin.

The refrigeration apparatus of the embodiment of the present invention is briefly described below.

According to the refrigeration equipment in the embodiment of the invention, the refrigeration equipment comprises the heat dissipation assembly 200 in the embodiment, and the refrigeration equipment in the embodiment of the invention is provided with the heat dissipation assembly 200 in the embodiment, so that the refrigeration equipment has excellent heat transfer performance, and has the characteristics of high efficiency in heat dissipation and low resistance.

In the description of the present invention, it is to be understood that the terms "width", "vertical", "away", "directly opposite", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description of the present invention, "a plurality" means two or more.

Reynolds numbers, boundary layer and boundary layer thicknesses, etc. and operation according to embodiments of the invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of "one embodiment," "an embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.