Fin, heat exchanger and air conditioner having the same

Abstract

The present invention provides a fin, a heat exchanger, and an air conditioner having the same. The fins are formed with fin tube holes for inserting heat exchange tubes, and the fins have fin flanges on the leeward side of the fin tube holes. By forming flanges on the leeward side of the fin tube holes, the present invention reduces the thermal resistance between the copper tube and the fins. It also increases the nucleation point of water droplets on the heat exchanger surface under dehumidification conditions, thereby enhancing the heat exchange efficiency of the heat exchanger. Furthermore, the fin structure of this technical solution is simple, and the enhanced heat exchange efficiency is achieved without adding a large amount of structure.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange of air conditioners, and in particular to a fin and a heat exchanger and an air conditioner having the same. Background Art

[0002] Fins are commonly used in heat exchangers in air conditioners. Multiple fins form a fin pack, creating airflow channels between the fins to facilitate heat exchange and provide improved heat transfer performance. To enhance heat transfer, improvements are often made to the copper tube or fin structure. These improvements can include modifying the internal thread structure of the copper tube to alter the refrigerant flow and enhance heat transfer, or modifying the fin surface structure to increase turbulence on the air side.

[0003] Currently, there is a lack of methods to enhance the heat exchange effect by improving and optimizing the contact structure between fins and copper tubes to improve the heat exchange efficiency of fins and tubes, thereby improving the cooling capacity and cooling energy efficiency of air conditioners. Summary of the Invention

[0004] In view of this, the present invention provides a fin with an optimized contact structure between the fin and the copper tube, and a heat exchanger and an air conditioner having the fin, specifically:

[0005] The present invention provides a fin, on which a fin tube hole is formed for inserting a heat exchange tube. The fin is characterized in that a fin flange is formed on the leeward side of the fin tube hole.

[0006] Furthermore, the fin flange is in an arc shape.

[0007] Furthermore, the fin flange has an inner side surface that matches the shape of the outer circumferential surface of the heat exchange tube and can fit the outer circumferential surface of the heat exchange tube.

[0008] Furthermore, guide grooves are formed on the surface of the fins.

[0009] Furthermore, the fins do not have flanges on the windward side of the fin tube holes, and the heat exchange tubes are in an exposed state.

[0010] Furthermore, the central angles of the two end sides of the fin flange relative to the center of the fin tube hole are 60 degrees to 180 degrees.

[0011] Furthermore, the arc length of the fin flange is 1 / 6πR to 1 / 2πR, where R is the diameter of the fin tube hole.

[0012] The present invention further provides a heat exchanger comprising a heat exchange tube and a plurality of rows of fins formed on the heat exchange tube, wherein the fins close to the inlet side of the heat exchange tube are the fins described above.

[0013] In addition, the present invention also provides an air conditioner having the heat exchanger described above.

[0014] The present invention forms a flange on the leeward side of the fin tube hole to reduce the thermal resistance of the contact between the copper tube and the fin. At the same time, it increases the water droplet nucleation point on the surface of the heat exchanger under dehumidification conditions, thereby enhancing the heat exchange efficiency of the heat exchanger. In addition, the fin structure in this technical solution is simple, and the heat exchange efficiency can be enhanced without adding more structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings. The drawings described below are only some embodiments of the present disclosure, and it is obvious to those skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0016] Figure 1 1 is a schematic diagram of the overall structure of a heat exchanger according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a single-row AA section of a heat exchanger according to an embodiment of the present invention;

[0018] Figure 3 yes Figure 2 A partial enlarged view of the fin tube hole on the middle AA section;

[0019] Figure 4 yes Figure 3 Main view;

[0020] Figure 5 This is a front view of a fin-heat exchange tube structure with two rows of heat exchange tubes cut out in one embodiment of the present invention;

[0021] Figure 6 yes Figure 5 Bottom view.

[0022] In the picture:

[0023] 1- fin; 2- heat exchanger side plate; 3- heat exchange tube; 4- fin tube hole; 5- fin flange; D- fin width; R- fin tube hole diameter; H- fin flange height; d1- vertical fin hole pitch; h- fin thickness; L- fin length; L0- distance between the top guide groove opening and the upper edge of the fin; d2- distance between adjacent oblique guide grooves; α- angle between the oblique guide groove and the vertical direction; h1- guide groove depth; d- guide groove width; d0- distance between the edge guide groove and the left and right edges of the fin; d3- distance between vertical guide grooves DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. "A plurality" generally includes at least two, but does not exclude the inclusion of at least one.

[0026] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0027] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0028] Existing heat exchanger tubes are typically copper tubes, with the contact surface between the copper tube and the fins completely enclosed by the fin flanges. However, during the expansion process after punching the fins, residual stress from the expansion can cause some of the fin flanges to slightly arch. This phenomenon, easily visible under an electrical microscope, conforms to basic physical laws and is unavoidable. This arching of the fins allows a small amount of air to remain on the copper fin contact surface, significantly increasing the thermal resistance of the metal interface and hindering heat exchange.

[0029] Currently, the method used to enhance the heat transfer efficiency of fin heat exchangers is mostly through changing the copper tube structure or the fin structure. The present invention optimizes the contact structure at the contact point between the fin and the copper tube, thereby improving the heat transfer efficiency of the fin-tube heat exchanger and ultimately improving the user comfort of the air conditioner. To better explain the technical solution of the present invention, the following examples are used for illustration, specifically:

[0030] Example 1:

[0031] like Figure 1-6 As shown, to improve the heat exchange efficiency of the fin 1, this embodiment provides a fin 1 having a fin tube hole 4 formed thereon for inserting a heat exchange tube 3. The fin 1 has a fin flange 5 formed on the leeward side of the fin tube hole 4. Unlike existing fin flanges 5, the fin flange 5 is formed only on the leeward side of the fin tube hole 4, thereby reducing the thermal resistance of the contact surface between the heat exchange tube and the fin 1 and improving the heat exchange efficiency. The fin 1 does not have a flange on the windward side of the tube hole, leaving the heat exchange tube 3 exposed. This can reduce the contact thermal resistance between the heat exchange tube 3 and the fin 1, improve the heat exchange efficiency, and enhance the heat exchange effect.

[0032] Preferably, the fin flange 5 is arc-shaped, and conforms to the outer circumference of the cylindrical heat exchange tube 3. This shape matches the outer circumference of the cylindrical heat exchange tube 3, preventing air from being trapped between the heat exchange tube 3 and the fin flange 5, thereby reducing thermal resistance. Further preferably, the fin flange 5 has an inner surface that matches the shape of the outer circumference of the heat exchange tube 3 and can conform to the outer circumference of the heat exchange tube 3. The shape of the heat exchange tube 3 can be preset as needed, as can the shape of the fin 1 itself. The inner surface of the flange conforms to the outer circumference of the heat exchange tube 3, ensuring that the thermal resistance between the fin flange 5 and the heat exchange tube 3 is reduced, thereby improving heat exchange efficiency.

[0033] Preferably, a guide groove is formed on the surface of the fin 1 to avoid deformation of the fin flange 5 due to thermal expansion and contraction. Under dehumidification conditions, water vapor in the air condenses into nuclei on the surface of the heat exchange tube 3, which can increase the latent heat transfer and enhance the heat exchange effect. However, excessive water dew will also affect the effects of other structures of the fin 1 in actual applications. Providing a guide groove can avoid the formation of excessive water dew, which will lead to a poor heat exchange effect.

[0034] The guide grooves include vertical guide grooves and oblique guide grooves. The vertical guide grooves are formed in the area without fin holes in the vertical direction, and the oblique drainage grooves are formed in the area with fin holes.

[0035] Preferably, the present invention defines and optimizes specific size parameters as follows:

[0036] The fin length L is preferably 20 cm to 50 cm, wherein the size of L is related to the size of the heat exchanger. The length of L is preferably within this range so that the fins in this embodiment have a better surface structure;

[0037] Fin thickness h, preferably 0.105mm-0.095mm, to avoid affecting the surface structure of the fin in this example;

[0038] Fin width D, where the size of D is related to the number of rows of heat exchange tubes. This design avoids affecting the surface structure of the fins in this example;

[0039] The diameter R of the fin tube hole is preferably 6mm-10mm, where the size of R is related to the diameter of the heat exchange tube, making the fin more beautiful;

[0040] The vertical fin hole distance d1 is preferably 19mm-25mm, where the size of d1 is related to the diameter of the heat exchange tube. This design avoids affecting the surface structure of the fin in this example;

[0041] The distance L0 between the top drainage slot opening and the upper edge of the fin is preferably in the range of 0-0.5R, and the position of the fin tube hole is reasonably arranged;

[0042] The spacing d2 between adjacent oblique drainage grooves is preferably in the range of 0-0.5R, where the size of d2 is affected by the process level. This design makes the fin surface structure layout more compact;

[0043] The angle α between the oblique drainage groove and the vertical direction is preferably in the range of 30°-60°. This design makes the fin surface structure layout more compact.

[0044] The drainage groove depth h1 is preferably in the range of 0-0.5H, where the size of h1 is limited by the process level. This design avoids affecting the surface structural strength of the fin in this example;

[0045] The distance d0 between the edge drainage groove and the left and right edges of the fin is preferably in the range of 0.5H-2H. This design makes the fin surface structure layout more compact.

[0046] The drainage groove width d is preferably in the range of 0.5H-2H, which can discharge the condensed water droplets in time while ensuring the strength of the fin structure;

[0047] The distance d3 between vertical drainage grooves is preferably in the range of 1H-2H. This design makes the fin surface structure more compact.

[0048] The fin flange height H is preferably in the range of 1.3 mm to 1.4 mm to avoid affecting the spacing of multiple rows of heat exchange tubes.

[0049] It is further preferred that the central angles of the two end sides of the fin flange 5 relative to the center of the fin tube hole are 60 degrees to 180 degrees, so as to better improve the heat exchange effect and ensure the fixation of the heat exchange tube.

[0050] It is further preferred that the arc length of the fin flange 5 is 1 / 6πR to 1 / 2πR, where R is the diameter of the fin tube hole 4. The diameter R of the fin tube hole 4 is related to the diameter of the heat exchange tube 3. Preferably, the diameter R of the fin tube hole 4 is 6mm to 10mm. In addition, the vertical fin hole spacing d1 is related to the diameter of the heat exchange tube 3. Preferably, the vertical fin hole spacing d1 is 19mm to 25mm.

[0051] The fin 1 provided in this embodiment has a fin flange formed on the leeward side of the fin tube hole 4, and the fin flange 5 is in close contact with the heat exchange tube 3 to avoid a small amount of air between the fin flange 5 and the heat exchange tube 3, which would increase the thermal resistance of the contact surface. The setting of the fin flange 5 can effectively reduce the thermal resistance of the contact surface between the fin 1 and the fin flange 5, thereby improving the heat exchange efficiency.

[0052] It should be noted that:

[0053] The fin structure in the present invention is not limited to a single type of fin and is applicable to various types of fins, such as slit fins, corrugated fins, and window fins. The flange structure treatment actually optimizes the structure of the tube-fin contact surface without affecting the enhanced heat exchange structure of the fin itself.

[0054] Example 2:

[0055] The fin 1 is generally used in conjunction with the heat exchange tube 3. This embodiment provides a heat exchanger. The fin 1 in the heat exchanger includes the fin 1 described in Example 1, specifically:

[0056] This embodiment provides a heat exchanger comprising a heat exchange tube 3 and multiple rows of fins 1 formed on the heat exchange tube 3. The fins near the inlet side of the heat exchange tube 3 are the fins 1 described in the above-mentioned embodiment 1. Furthermore, heat exchanger side panels 2 are provided at both ends of the fins 1 to protect the fins 1 from damage.

[0057] Fins 1 have a certain width during production. The fin width D is uniform in the same heat exchanger and is related to the number of heat exchange tube rows. Fin thickness h is also uniform in the same heat exchanger.

[0058] The fin 1 described in this embodiment has been described in Example 1 and will not be repeated here.

[0059] Example 3:

[0060] This embodiment provides an air conditioner based on Embodiment 1 and Embodiment 2, specifically:

[0061] This embodiment provides an air conditioner having the heat exchanger described in the above-mentioned embodiment 2.

[0062] The heat exchanger structure provided in this embodiment has been described in Example 2 and will not be repeated here. The air conditioner provided in this embodiment can provide users with better heat exchange effect, improve heat exchange efficiency, and provide a better user experience.

[0063] In summary, the present invention forms a flange on the leeward side of the fin tube hole, which can reduce the thermal resistance between the fin and the heat exchange tube, improve the heat exchange efficiency of the fin and the heat exchange tube, and at the same time improve the formation of nuclei of water droplets on the surface of the heat exchanger under dehumidification conditions, thereby enhancing heat exchange. The air conditioner with the fins described in the present invention can provide better heat exchange effect and provide users with better usage experience and comfort.

[0064] While the exemplary embodiments of the present disclosure have been specifically illustrated and described above, it should be understood that the present disclosure is not limited to the detailed structures, configurations, or implementations described herein; rather, the present disclosure is intended to encompass various modifications and equivalent configurations within the spirit and scope of the appended claims.

Claims

1. A heat exchanger, characterized in that: The invention comprises a heat exchange tube (3) and a plurality of rows of fins (1) formed on the heat exchange tube (3), wherein the fins (1) are formed with fin tube holes (4) for inserting the heat exchange tube (3), and the fin tube holes (4) are circumferentially closed tube holes; wherein the fins (1) close to the inlet side of the heat exchange tube (3) are provided with fin flanges (5) located on the leeward side of the fin tube holes (4), and the fins (1) do not have flanges on the windward side of the fin tube holes (4), and the heat exchange tube (3) is in a naked state.

2. The heat exchanger according to claim 1, wherein: The fin flange (5) is in an arc shape.

3. The heat exchanger according to claim 1, wherein: The fin flange (5) has an inner side surface that matches the shape of the outer circumferential surface of the heat exchange tube (3), and the inner side surface can fit the outer circumferential surface of the heat exchange tube (3).

4. The heat exchanger according to claim 3, wherein: A guide groove is formed on the surface of the fin (1).

5. The heat exchanger according to claim 4, characterized in that: The guide grooves include vertical guide grooves and oblique guide grooves. The vertical guide grooves are formed in a region without fin holes in the vertical direction, and the oblique drainage grooves are formed in a region with fin holes.

6. The heat exchanger according to claim 1, wherein: The central angles of the two end sides of the fin flange (5) relative to the center of the fin tube hole are 60 degrees to 180 degrees.

7. The heat exchanger according to claim 6, characterized in that The arc length of the fin flange (5) is 1 / 6πR~1 / 2πR, where R is the diameter of the fin tube hole.

8. An air conditioner, characterized in that: The heat exchanger comprises the heat exchanger according to any one of claims 1 to 7.

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