Fin assembly, heat exchanger and air conditioner

Abstract

The present application provides a fin assembly, a heat exchanger and an air conditioner. The fin assembly includes a fin base surface, and a slotted bridge piece is arranged on the fin base surface; the slotted bridge piece includes: a top piece and two support pieces, and the top piece is inclined relative to the fin base surface; the top piece is erected on the fin base surface through the two support sections. By arranging the slotted bridge piece which is inclined on the fin base surface, the flow direction of air is changed during the flow process on the fin base surface, and the flow velocity will gradually increase, so that sufficient heat exchange can be carried out with the heat exchange tube, and the heat exchange effect of the heat exchange fin is further improved.

Description

Technical Field

[0001] This application belongs to the technical field of air conditioners, and particularly relates to a fin assembly, a heat exchanger, and an air conditioner. Background Art

[0002] Finned tube heat exchangers are widely used in air conditioners, refrigeration, and HVAC equipment. The refrigerant flows inside the heat exchange tubes of the heat exchanger, and the air to be heated or cooled flows on the fin side outside the heat exchange tubes. Since the heat transfer effect of air is worse than that of the refrigerant, the air-side thermal resistance accounts for 80% - 90% of the total thermal resistance of the heat exchanger. Therefore, optimizing the heat transfer on the air side can effectively improve the overall heat transfer performance of the heat exchanger.

[0003] The fins outside the traditional heat exchange tubes include plain fins, which can only increase the heat transfer area and have no ability to disturb the air to enhance heat transfer. There are also corrugated fins, louver fins, and open-bridge fins. Although they can disturb the air and thin the boundary layer on the fin surface, the corresponding air resistance also increases. When the air passes through the heat exchange tubes, the air is blocked by the heat exchange tubes and separated. The air continues to flow along the surface of the heat exchange tubes. The flow inertia of the air makes the side of the heat exchange tube close to the leeward side become the wake area, resulting in a low heat transfer efficiency of the heat exchanger. When the fin surface temperature is lower than the dew point temperature, condensate will be generated on the fin surface. The condensate that is not discharged in time increases the air resistance and reduces the heat transfer ability of the fins, resulting in a low heat transfer efficiency of the heat exchanger. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this application is to provide a fin assembly, a heat exchanger, and an air conditioner that can improve the heat transfer efficiency.

[0005] To solve the above problems, this application provides a fin assembly, including:

[0006] A fin base surface, on which an open-slotted bridge piece is provided;

[0007] The open-slotted bridge piece includes: a top piece and two support members. The top piece is inclined relative to the fin base surface; the top piece is erected on the fin base surface through the two support sections.

[0008] Optionally, the included angle between the top piece and the fin base surface is 15° - 23°.

[0009] Optionally, through holes are provided on the fin base surface, and the through holes are directly opposite to the top piece in the thickness direction of the fin base surface.

[0010] Optionally, multiple open-slotted bridge pieces are arranged in multiple columns along the length direction of the fin base surface, and the inclination directions of the top pieces in adjacent two columns are symmetrically arranged.

[0011] Optionally, all the slotted bridge pieces on each column have the same inclination direction and inclination angle.

[0012] Optionally, along the air flow direction on the fin base surface, the spacing between adjacent slotted bridge pieces in one column is greater than the spacing between adjacent slotted bridge pieces in the next column.

[0013] Optionally, a plurality of heat exchange tube holes are provided on the fin base surface and are distributed along the length direction of the fin base surface, and each heat exchange tube hole is located between some of the slotted bridge pieces.

[0014] Optionally, the fin base surface between adjacent heat exchange tube holes is provided as a corrugated channel, and the corrugated channel is arranged in a corrugated shape along the width direction of the fin base surface.

[0015] Optionally, there are a plurality of the corrugated channels, and the length of the corrugated channels increases along the air flow direction on the fin base surface.

[0016] Optionally, the support member includes a vertical plate which is arranged perpendicular to the fin base surface; the included angle between the vertical plate and the width direction of the fin base surface increases along the air flow direction on the fin base surface.

[0017] Optionally, on the windward side along the fin base surface, one slotted bridge piece is arranged on some columns between adjacent heat exchange tube holes, and along the air flow direction on the fin base surface, the length of the slotted bridge pieces in one column is less than the length of the slotted bridge pieces in the next column.

[0018] Optionally, on the leeward side of the fin base surface, a plurality of spaced slotted bridge pieces are arranged on some columns between adjacent heat exchange tube holes.

[0019] According to another aspect of the present application, a heat exchanger is provided, including the fin assembly as described above.

[0020] According to still another aspect of the present application, an air conditioner is provided, including the fin assembly as described above or the heat exchanger as described above.

[0021] A fin assembly provided by the present application includes: a fin base surface, on which slotted bridge pieces are provided; each slotted bridge piece includes: a top piece and two support members, the top piece is inclined relative to the fin base surface; the top piece is erected on the fin base surface through the two support segments. By providing the slotted bridge pieces inclined on the fin base surface, the air flow direction is changed during the air flow on the fin base surface, and the flow rate will gradually increase, enabling full heat exchange with the heat exchange tubes, and further improving the heat exchange effect of the heat exchange fins. Description of the Drawings

[0022] Figure 1 This is a schematic structural diagram of a fin assembly according to an embodiment of the present application;

[0023] Figure 2 For the embodiments of this application Figure 1 AA section view.

[0024] The reference numerals are as follows:

[0025] 1. Fin base; 11. Through hole; 2. Straight fin area; 3. Heat exchange tube hole; 4. Slit bridge area; 5. Slit bridge; 6. Vertical plate; 7. Top plate; 8. Corrugated groove. DETAILED DESCRIPTION

[0026] See also Figures 1 to 2 As shown, according to an embodiment of the present application, a fin assembly includes:

[0027] A fin base surface 1, wherein a slotted bridge piece 5 is provided on the fin base surface 1;

[0028] The slit bridge sheet 5 comprises: a top sheet 7 and two supporting members, wherein the top sheet 7 is arranged obliquely relative to the fin base surface 1; the top sheet 7 is mounted on the fin base surface 1 via the two supporting sections.

[0029] The present application includes a straight fin on the fin base 1, on which a slit bridge piece 5 is arranged. Since the top piece 7 of the slit bridge piece 5 is inclined with respect to the fin base 1, the direction of the airflow flowing through the fin base 1 is changed, and the boundary layer on the fin base 1 is changed, the local flow velocity can be increased, the thermal resistance is reduced, and the heat exchange capacity and efficiency are improved.

[0030] When air flows over the surface of a flat plate, the air velocity increases sharply as the distance from the flat plate increases due to the viscosity of the flat plate surface. After passing through a thin layer, the velocity increases to a level close to the mainstream velocity. This thin layer is the boundary layer. The thinner the boundary layer, the more dramatic the velocity change here, which is conducive to heat transfer and better heat exchange. However, as the thickness of the boundary layer increases, the heat exchange gradually deteriorates.

[0031] In some embodiments, the angle between the top sheet 7 and the fin base surface 1 is 15° to 23°.

[0032] This angle range can improve the heat exchange capacity and efficiency without hindering the gas flow.

[0033] In some embodiments, a through hole 11 is provided on the fin base surface 1 , and the through hole 11 is directly opposite to the top sheet 7 along the thickness direction of the fin base surface 1 .

[0034] In this application, the slotted bridge piece 5 is erected relative to the fin base surface 1 after a part of it is cut, and through holes 11 are formed after cutting. The cut part is erected by a support member to form a top piece 7, in order to more conveniently promote the change of the boundary layer on the fin base surface 1, reduce the thermal resistance, and improve the heat exchange efficiency.

[0035] In some embodiments, a plurality of the slotted bridge pieces 5 are arranged in multiple columns along the length direction of the fin base surface 1, and the inclination directions of the top pieces 7 of two adjacent columns are symmetrically arranged. Optionally, the inclination directions and inclination angles of all the slotted bridge pieces 5 on each column of the slotted bridge pieces 5 are the same.

[0036] When air flows through the open-bridge fins, due to the action of a top piece 7 that slopes downward towards the base surface along the air flow direction, the flow cross-sectional area gradually decreases, the air gradually accelerates, and the heat transfer is strengthened. Under the action of flowing through the next top piece 7 that slopes upward towards the base surface along the air flow direction, the flow cross-sectional area gradually increases, reducing the air flow resistance; the air flows through this cyclic up-and-down flow, which can reduce the boundary layer and improve the heat exchange efficiency.

[0037] When the above-mentioned multiple columns of slotted bridge pieces 5 are arranged, in the air flow direction along the fin base surface 1, the inclination of the slotted bridge pieces 5 in the first column can be set downward, so that the flow-through surface of the air flow is reduced.

[0038] In some embodiments, along the air flow direction on the fin base surface 1, the spacing between adjacent slotted bridge pieces 5 in one column is greater than the spacing between adjacent slotted bridge pieces 5 in the next column.

[0039] Setting the slotted bridge pieces 5 on the air flow path has a guiding effect on the air. The change in the spacing between two adjacent columns of slotted bridge pieces 5 causes the air to change its flow direction during the flow on the plain fins, and the flow velocity will also gradually increase, thereby reducing the boundary layer phenomenon and improving the heat exchange efficiency.

[0040] In some embodiments, a plurality of heat exchange tube holes 3 are provided on the fin base surface 1 and are distributed along the length direction of the fin base surface 1, and each heat exchange tube hole 3 is located between some of the slotted bridge pieces 5.

[0041] Setting the heat exchange tube holes 3 on the fin base surface 1 without the slotted bridge pieces 5 facilitates the threading of heat exchange tubes. In this way, the air flow after being guided by the slotted bridge pieces 5 can be concentrated to fully perform heat exchange with the heat exchange tubes, improving the heat exchange effect.

[0042] In some embodiments, the fin base surface 1 between adjacent heat exchange tube holes 3 is provided with a corrugated channel 8, and the corrugated channel 8 is arranged in a corrugated shape along the width direction of the fin base surface 1. Optionally, there are a plurality of corrugated channels 8, and in the air flow direction along the fin base surface 1, the length of the corrugated channel 8 increases.

[0043] The corrugated channels 8 are arranged along the length direction of the fin base surface 1, which not only disturbs the air flow to enhance heat transfer, but also timely discharges the condensed water droplets from the fins. The length of adjacent corrugated channels 8 varies, improving the heat transfer efficiency with the heat exchange tubes.

[0044] In some embodiments, the support member includes an upright plate 6, and the upright plate 6 is arranged perpendicular to the fin base surface 1; the included angle between the upright plate 6 and the width direction of the fin base surface 1 increases in the air flow direction along the fin base surface 1.

[0045] By changing the installation angle of the upright plate 6 in the slotted bridge piece 5, it is used to better guide the air flow and promote the improvement of the heat transfer effect.

[0046] In some embodiments, on the windward side along the fin base surface 1, one slotted bridge piece 5 is arranged on some columns between adjacent heat exchange tube holes 3, and along the air flow direction on the fin base surface 1, the length of the slotted bridge piece 5 on one column is less than the length of the slotted bridge piece 5 on the next column. Optionally, on the leeward side of the fin base surface 1, a plurality of spaced slotted bridge pieces 5 are arranged on some columns between adjacent heat exchange tube holes 3.

[0047] By setting the change in the number of slotted bridge pieces 5, the air flow resistance is reduced and the heat transfer effect is improved.

[0048] According to another aspect of the present application, a heat exchanger is provided, including the fin assembly as described above.

[0049] This heat exchanger includes highly efficient heat exchange fins. The fin assembly in the heat exchange fins may include a fin base surface 1, a flat fin area 2, heat exchange tube holes 3, an open-bridge fin area, a slotted bridge piece 5, an upright plate 6, and a top piece 7; the flanged heat exchange tube holes 3 are opened on the fin base surface 1 for sleeving on the heat exchange tubes.

[0050] Since the air boundary layer on the windward side of the flat fins is thinner, the heat transfer capacity is good while the air flow resistance is low. The area close to the heat exchange tube on the windward side is called the high heat transfer area. However, in the area on the windward side far from the heat exchange tube, although the boundary layer is thin, the heat transferred from the copper tube to this fin area is less. Therefore, the heat transfer in this area is poor and it is called the low heat transfer area. The heat transfer process is radiated from the heat exchange tube to the surrounding. The high heat transfer area is closer to the heat exchange tube, so more heat is transferred to this area, the heat transfer situation is good, and the surface temperature of this area is higher, and no additional heat transfer enhancement structure needs to be added. The low heat transfer area is far from the heat exchange tube. When the heat is transferred to this area, the heat is gradually carried away by the air. Therefore, less heat can be transferred to this area, and the surface temperature is lower. If no heat transfer enhancement structure is added, the heat transfer in this area is poor.

[0051] In order to improve the overall heat transfer capacity of the fins and simultaneously reduce the air flow resistance as much as possible, plain fins are used in the high heat transfer region, and slotted bridge fins 5 are provided in the low heat transfer region.

[0052] On the fin base surface 1, there are raised slotted bridge fins 5. The slotted bridge fin 5 is composed of two vertical plates 6 and a top plate 7. The top plate 7 is connected to the fin base surface 1 through two vertical plates 6 perpendicular to the fin base surface 1. The angle between the arrangement direction of the vertical plate 6 perpendicular to the fin base surface 1 and the horizontal center line of the heat exchange tube hole 3 gradually increases, which is used to guide the air flow. The slotted bridge fins 5 on the upper and lower sides of the horizontal center line of the heat exchange tube hole 3 along the air flow direction are symmetrically distributed. And the distance between the adjacent vertical plates 6 of the slotted bridge fins 5 on the upper and lower sides gradually decreases along the air flow direction. The length of the slotted bridge fin 5 gradually increases along the air flow direction, and the last two rows of long slotted bridge fins 5 are each divided into three short slotted bridge fins 5.

[0053] Corrugated channels 8 are provided on both sides of the vertical center line of the heat exchange tube hole 3. The length of the corrugated channel 8 in the vertical direction on the windward side near the heat exchange tube hole 3 is slightly shorter than that of the corrugated channel 8 on the leeward side.

[0054] The top plate 7 of the slotted bridge fin 5 is inclined. The angle between the top plate 7 and the fin base surface 1 is 15° - 23°. And along the air flow direction, the top plates 7 of two adjacent slotted bridge fins 5 are symmetrically arranged. The top plate 7 of the first row of slotted bridge fins 5 along the air flow direction is inclined downward, and the top plate 7 of the second row of slotted bridge fins 5 is inclined upward, and so on; and the angle between the top plate 7 of each row of slotted bridge fins 5 and the fin base surface 1 is equal.

[0055] According to another aspect of the present application, an air conditioner is provided, which includes the fin assembly as described above or the heat exchanger as described above.

[0056] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned various embodiments can be freely combined and superimposed.

[0057] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A fin assembly, characterized in that, Comprising: A fin base surface (1), on which a plurality of heat exchange tube holes (3) are arranged along the length direction of the fin base surface (1), and the heat exchange tube holes (3) are used for sleeving heat exchange tubes; The fin base surface (1) includes a flat fin area (2) and a slotted fin area. The heat exchange tube holes (3) are located in the flat fin area (2). And along the flow direction of the air flow on the fin base surface (1), the windward side to the leeward side of the fin base surface (1) is the width direction of the fin base surface (1). From the windward side to the leeward side of the fin base surface (1), the distance between the outer edges of the flat fin area (2) gradually decreases, so that the flat fin area (2) forms a trapezoidal area, and the heat exchange tube holes (3) are located in the trapezoidal area; A slotted bridge piece (5) is arranged on the fin base surface (1), and the slotted bridge piece (5) is located in the slotted fin area; The slotted bridge piece (5) includes: a top piece (7) and two support members. The top piece (7) is inclined relative to the fin base surface (1); The top piece (7) is erected on the fin base surface (1) through the two support members; A plurality of the slotted bridge pieces (5) are arranged in multiple columns along the width direction of the fin base surface (1), and the inclination directions of the top pieces (7) of any two adjacent columns are symmetrically arranged.

2. The fin assembly according to claim 1, wherein The included angle between the top piece (7) and the fin base surface (1) is 15° - 23°.

3. The fin assembly according to claim 1 or 2, characterized in that A through hole (11) is arranged on the fin base surface (1), and the through hole (11) is directly opposite to the top piece (7) along the thickness direction of the fin base surface (1).

4. The fin assembly according to claim 1, wherein The inclination directions and inclination angles of all the slotted bridge pieces (5) on each column of the slotted bridge pieces (5) are the same.

5. The fin assembly according to claim 4, characterized in that, Along the air flow direction on the fin base surface (1), the distance between adjacent slotted bridge pieces (5) in one column is greater than the distance between adjacent slotted bridge pieces (5) in the next column.

6. The fin assembly according to claim 5, wherein, Each heat exchange tube hole (3) is located between some of the slotted bridge pieces (5).

7. The fin assembly according to claim 6, characterized in that, The fin base surface (1) between adjacent heat exchange tube holes (3) is provided with a corrugated channel (8), and the corrugated channel (8) is arranged in a corrugated shape along the width direction of the fin base surface (1).

8. The fin assembly according to claim 7, characterized in that, There are a plurality of the corrugated channels (8), and along the air flow direction on the fin base surface (1), the length of the corrugated channel increases.

9. The fin assembly according to claim 6, wherein The support member includes a vertical plate (6), and the vertical plate (6) is perpendicular to the fin base surface (1); The included angle between the vertical plate (6) and the width direction of the fin base surface (1) increases along the air flow direction of the fin base surface (1).

10. The fin assembly according to claim 6, characterized in that, On the windward side of the fin base surface (1) along the air flow direction, one slotted bridge piece (5) is arranged on some columns between adjacent heat exchange tube holes (3), and along the air flow direction on the fin base surface (1), the length of the slotted bridge piece (5) in one column is less than the length of the slotted bridge piece (5) in the next column.

11. The fin assembly according to claim 10, wherein, On the leeward side of the fin base surface (1), a plurality of spaced slotted bridge pieces (5) are arranged on some columns between adjacent heat exchange tube holes (3).

12. A heat exchanger, characterized in that, Comprising the fin assembly according to any one of claims 1-11.

13. An air conditioner, characterized in that, Comprising the fin assembly according to any one of claims 1-11 or the heat exchanger according to claim 12.

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