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,每个所述桥片组包括多个在空气流向上间隔开的多个桥片,多个所述桥片限定出弧形的第二空气流路。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；其中限定出第二空气流路的多个桥片相当于涡发生器,可以产生与主流流动方向垂直的二次流动,强化换热管后部的传热。(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 are arranged at intervals to define a first air flow path, each bridge plate group comprises a plurality of bridge plates which are spaced in the air flow direction, and the plurality of bridge plates define an arc-shaped second air flow path. According to the radiating fin for the heat exchanger, disclosed by the embodiment of the invention, the flow boundary layer is damaged by the bridge fin group, 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; wherein the plurality of bridges defining the second air flow path act as vortex generators and can generate secondary flow perpendicular to the flow direction of the main flow to enhance heat transfer at the rear of the heat exchange tube.)

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 are arranged at intervals to define a first air flow path, each bridge plate group comprises a plurality of bridge plates which are spaced in the air flow direction, and the plurality of bridge plates define an arc-shaped second air flow path.

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

a first sidewall and a second sidewall formed on the substrate and facing each other;

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.

3. The fin for a heat exchanger of claim 2, wherein the first and second side walls are configured to be arcuate to define an arcuate shim channel with the top wall, a plurality of the shim channels defining the second air flow path.

4. The fin for a heat exchanger as claimed in claim 2, wherein a first bridge piece group, a second bridge piece group and a third bridge piece group are arranged between two adjacent fin tube holes, and the first bridge piece group and the third bridge piece group are respectively adjacent to the corresponding fin tube holes;

the first side wall and the second side wall of the bridge piece in the first bridge piece group are respectively bent towards the direction far away from the corresponding fin tube hole, and the first side wall and the second side wall of the bridge piece in the third bridge piece group are respectively bent towards the direction far away from the corresponding fin tube hole.

5. The fin for a heat exchanger according to claim 4, wherein the first air flow path between the first and second fin groups and the first air flow path between the second and third fin groups are respectively curved toward a direction away from the corresponding fin tube hole.

6. 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 third air flow path.

7. The fin for a heat exchanger of claim 6, wherein the third air flow path is configured in an arc and at least partially surrounds the fin tube bore.

8. 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.

9. A heat sink assembly, comprising: a plurality of the fin according to any one of claims 1 to 8, the plurality of fins being arranged in series in an air flow direction.

10. The heat dissipation assembly of claim 9, 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.

11. The heat dissipating assembly of claim 10, 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.

12. Refrigeration device, comprising a heat sink assembly according to any of claims 9-11.

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.

The air side convection enhanced heat transfer technology can be classified into the following physical mechanisms: disruption of boundary layers, introduction of secondary flows and enhancement of turbulent disturbances. 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.

Disclosure of Invention

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

To this end, an object of the present invention is to provide a heat dissipating fin for a heat exchanger, in which a set of fins can break a flow boundary layer to increase a heat transfer effect, wherein a plurality of fins defining a second air flow path, which corresponds to a vortex generator, can generate a secondary flow perpendicular to a flow direction of a main flow to enhance heat transfer at a rear portion of a heat exchanging pipe.

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 are arranged at intervals to define a first air flow path, each bridge plate group comprises a plurality of bridge plates which are spaced in the air flow direction, and the plurality of bridge plates define an arc-shaped second air flow path.

According to the radiating fin for the heat exchanger, disclosed by the embodiment of the invention, the flow boundary layer is damaged by the bridge fin group, 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; wherein the plurality of bridges defining the second air flow path act as vortex generators and can generate secondary flow perpendicular to the flow direction of the main flow to enhance heat transfer at the rear of the heat exchange tube.

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:

further, each of the bridge pieces includes: a first sidewall and a second sidewall formed on the substrate and facing each other; 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.

Further, the first and second side walls are configured in an arc shape to define an arc-shaped bridge channel with the top wall, the plurality of bridge channels defining the second air flow path.

Furthermore, a first bridge plate group, a second bridge plate group and a third bridge plate group are arranged between two adjacent fin tube holes, and the first bridge plate group and the third bridge plate group are respectively adjacent to the corresponding fin tube holes; the first side wall and the second side wall of the bridge piece in the first bridge piece group are respectively bent towards the direction far away from the corresponding fin tube hole, and the first side wall and the second side wall of the bridge piece in the third bridge piece group are respectively bent towards the direction far away from the corresponding fin tube hole.

Further, the first air flow path between the first bridge piece group and the second bridge piece group and the first air flow path between the second bridge piece group and the third bridge piece group are respectively bent towards a direction away from the corresponding fin tube holes.

Further, the peripheral edges of the finned tube holes are spaced from the adjacent bridge piece groups to form a third air flow path.

Further, the third air flow path is configured to be arcuate and at least partially surround the finned tube bore.

Further, 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.

Further, in two adjacent base plates, the plurality of fin tube holes on one base plate and the plurality of fin tube holes on the other base plate are arranged in a staggered mode.

Further, 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 schematic diagram of a partial structure of a heat dissipation assembly according to an embodiment of the invention;

FIG. 4 is a graph comparing the heat transfer performance of the present invention and flat-sheet, louvered heat transfer performance.

Reference numerals:

a heat dissipation fin 100, a first bridge plate group 101, a second bridge plate group 102, a third bridge plate group 103,

a first air flow path 104, a second air flow path 105, a third air flow path 106,

the heat-dissipating component 200 is provided with a heat-dissipating structure,

substrate 1, bridge plate 11

The finned tube holes 2.

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, is described below with reference to fig. 1 to 3.

Specifically, the substrate 1 is provided with a plurality of fin tube holes 3 spaced in a direction perpendicular to the air flow direction; a plurality of said bridge plate groups are disposed between adjacent two of said finned tube holes 3, and adjacent two of said bridge plate groups are spaced apart to define a first air flow path 104, each of said bridge plate groups comprising a plurality of bridge plates 11 spaced apart in an air flow direction, a plurality of said bridge plates 11 defining an arcuate second air flow path 105.

According to the heat dissipation fin 100 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; wherein the plurality of fins 11 defining the second air flow path 105 act as vortex generators and generate a secondary flow perpendicular to the main flow direction, enhancing heat transfer at the rear of the heat exchange tube. The technical characteristics of the two are combined, the heat transfer effect of a single strengthening technology can be improved again, and the heat transfer effect of 1+1>2 is realized through the combination of the strengthening heat transfer technologies.

In one embodiment of the invention, each of the bridge pieces comprises: a first sidewall and a second sidewall formed on the substrate 1 and facing each other; 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 1, 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 1; wherein the first and second side walls are configured in an arc to define with the top wall an arc-shaped bridge channel, a plurality of which define the second air flow path 105. The fluid flows in from the first opening and the second opening, and the arc-shaped bridge piece channel enables the fluid flowing into the bridge piece to rotate along the wall surface of the bridge piece more easily, so that longitudinal vortexes consistent with the main flow direction are formed, and the heat transfer of the downstream side of the heat exchange tube is enhanced.

Since the second air flow path 105 is configured in an arc shape, the fins defining the second air flow path 105 are angled with respect to the flow direction of the primary air, so that the air can impinge on the first side wall or the second side wall of the fins, and the fluid flowing into the fins can be more easily made to rotate along the wall surfaces of the fins, forming longitudinal vortices in line with the main flow direction, enhancing heat transfer on the downstream side of the heat exchange tube.

In an embodiment of the present invention, as shown in fig. 1 specifically, a first bridge piece group 101, a second bridge piece group 102, and a third bridge piece group 103 are disposed between two adjacent fin tube holes 3, where the first bridge piece group 101 and the third bridge piece group 103 are respectively adjacent to the corresponding fin tube holes 3; the first side wall and the second side wall of the bridge piece in the first bridge piece group 101 are respectively bent towards the direction away from the corresponding fin tube hole 3, and the first side wall and the second side wall of the bridge piece 11 in the third bridge piece group 103 are respectively bent towards the direction away from the corresponding fin tube hole 3. The first side wall and the second side wall of the first bridge plate group 101 and the first side wall and the second side wall of the third bridge plate group 103 are on the substrate 1, and the arc-shaped bridge plates 11 which can generate longitudinal vortex flow are punched around the adjacent fin tube holes 3 as the circle center, which is equivalent to a vortex generator, so that the heat transfer effect adjacent to the downstream side of the heat exchange tube is improved.

In an embodiment of the present invention, the first air flow path 104 between the first bridge piece group 101 and the second bridge piece group 102 and the first air flow path 104 between the second bridge piece group 102 and the third bridge piece group 103 are respectively curved in a direction away from the corresponding fin tube hole 3. The two bridge plate groups separate the first air flow path 104, so that more fluid on the upstream side flows to the downstream side through the first air flow path 104, and the design increases the fluid flow in the unit of the downstream side while taking away the fluid heated by the heat exchange tube on the upstream side, so that the heat dissipation effect on the downstream side is better.

It is to be explained that, with respect to one heat dissipating fin 100, a local region where the fluid enters the heat dissipating 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, the peripheral edges of the finned tube holes 3 are spaced from the adjacent groups of bridges to form a third air flow path 106; the third air flow path 106 is configured in an arc shape and at least partially surrounds the fin tube hole 3. The design of the third air flow path 106 around the heat exchange tube not only can carry away a portion of the fluid heated by the heat exchange tube, but also can guide more fluid to the rear of the heat exchange tube, delaying the separation of the fluid boundary layer and enhancing the heat transfer at the rear of the heat exchange tube.

In one embodiment of the invention, the distance between two adjacent finned tube holes 3 is 10mm-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 104 and then flow to the fin tube holes 3 to form a second air flow path 105.

In one embodiment of the invention, the temperature and velocity field distribution cloud chart of the heat dissipation assembly 200 of the invention is obtained when the fins are flat and when air with the wind speed of 3m/s flows across the heat exchange tube.

In the experiment, the temperature and speed of the flat fin and the wake zone at the rear of the heat exchange tube of the heat dissipation assembly 200 of the present invention were compared, respectively:

in the flat fins, the heat exchange amount is improved mainly by increasing the heat exchange area, mainly by heat conduction and diffusion, and relatively weak convection. When fluid uniformly flows through the heat exchange tube, because the viscosity effect received by fluid particles in the boundary layer is not negligible, a low-speed area and a larger wake area exist at the rear part of the heat exchange tube, and particularly, the temperature at the rear part of the heat exchange tube at the downstream side is higher, and the heat dissipation effect of a tail tube at the downstream side is poor.

In the heat dissipation assembly 200 of the present invention, when the fluid uniformly flows through the heat exchange tubes, the bridge piece group disturbs the fluid, which destroys the thermal boundary layer, and the fluid is more easily led to the tail of the heat exchange tube at the downstream side due to the action of the first air flow path 104 and the third air flow path 106; when a part of fluid passes through the second air flow path 105, because the first side wall and the second side wall form an included angle with the initial fluid direction, the fluid collides with the first side wall or the second side wall and simultaneously is accompanied by the action of pressure, so that the fluid flowing into the bridge piece rotates along the wall surface of the bridge piece, the fluid can generate a longitudinal vortex with the rotating direction consistent with the main flow direction, and the longitudinal vortex can more effectively transfer the fluid to the downstream side to enhance the heat transfer of the rear area; therefore, compared with the low-speed wake zone at the rear part of the heat exchange tube with flat fins, the low-speed wake zone at the rear part of the heat exchange tube of the heat dissipation assembly 200 of the invention is greatly reduced from the upstream side, and the temperature of the heat exchange tube at the downstream side is also reduced.

Experimental results prove that when the fluid speed is 3m/s, the heat dissipation effect of the heat dissipation assembly 200 is superior to that of a flat fin, a tail flow area is almost not formed, the heat dissipation effect of a heat exchange tail pipe positioned at the downstream side is improved, and the heat transfer of the rear part of the heat exchange pipe is enhanced.

In one embodiment of the present invention, as shown in FIG. 4, a graph comparing the heat transfer performance of the heat dissipation assembly 200 of the present invention with that of flat fins and louvered fins is shown. The abscissa is the friction factor f multiplied by the Reynolds number Re³Can represent pump work, and the ordinate is the heat transfer rate Q/Q₀(ii) a Wherein the flow rate is 1m/s-4m/s, corresponding to the incoming flow Reynolds number 908-3633.

As can be seen from FIG. 3, at different incoming flow rates, the heat dissipation assembly 200 of the present invention has a heat transfer capability that is 24.2% -44.2% higher than that of flat fins; the heat transfer quantity of the heat dissipation assembly 200 is reduced by 7.2 percent compared with that of the louver fins under the same pump work condition when the incoming flow speed is low, such as the flow speed is 1 m/s; when the incoming flow speed is within the range of 3-5m/s, the heat transfer quantity of the heat dissipation assembly 200 is 5.2% -9.6% higher than that of the louver fins under the same pump work condition.

The experiment result shows that the overall heat dissipation capability of the heat dissipation assembly 200 of the invention is superior to that of flat fins, and compared with louver fins, the heat dissipation assembly 200 of the invention is more suitable for incoming flow at a flow speed of 3m/s or above and within a range corresponding to Reynolds number 2725-3633.

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 "central", "vertical", "facing", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and 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", "the second feature", and "the third feature" may include one or more of the features.

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

In the description herein, references to the description of "one embodiment," "a specific example" or the like are intended to 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.