Heat exchange fin, heat exchanger and air conditioner

Abstract

The present invention discloses a heat exchange fin, a heat exchanger and an air conditioner. The heat exchange fin comprises: at least one fin unit, the fin unit has a plate-like body, the plate-like body is a curved plate; the plate-like body is provided with a tube hole at its convex top and forms a flange around the tube hole, the convex extension direction of the flange is the same as the convex direction of the plate-like body; the plate-like body forms a first hollow structure around the tube hole, which extends toward the periphery with the tube hole as the center; the plate-like body forms a first guide groove on one side or both sides of the tube hole along the radial direction of the tube hole, one end of the first guide groove extends to the edge of the plate-like body, and the other end extends to the flange; wherein the first hollow structure is distributed on both sides of the first guide groove.

Description

Technical Field

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

[0002] At present, fin-tube heat exchangers are the most widely used heat exchangers in the field of refrigeration and air conditioning. The thermal resistance of this type of heat exchanger is concentrated on the air side outside the tube, which can reach about 70-80% of the total thermal resistance. Therefore, improving the heat transfer performance on the fin side is an important means to improve the capacity of the heat exchanger. At present, fin-tube heat exchangers are gradually developing in the direction of miniaturization and compactness, which is specifically reflected in the gradual reduction of the heat exchange tube diameter, but the heat transfer performance of the heat exchanger is also attenuated. The thinning of the heat exchanger reduces the heat transfer area inside the single copper tube, and it needs to be used in conjunction with fins with higher heat transfer performance. Summary of the invention

[0003] In view of this, the present invention discloses a heat exchange fin, a heat exchanger and an air conditioner, which are used to at least solve the problem of low heat exchange efficiency of the existing heat exchange fins.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical solution:

[0005] A first aspect of the present invention discloses a heat exchange fin, comprising: at least one fin unit,

[0006] The fin unit has a plate-shaped body, and the plate-shaped body is a curved plate;

[0007] The plate-like body is provided with a tube hole at its convex top and a flange is formed around the tube hole, and the convex extending direction of the flange is the same as the convex direction of the plate-like body;

[0008] The plate-like body forms a first hollow structure around the tube hole, which extends radiating outward from the tube hole as the center;

[0009] The plate-like body is provided with a first guide groove on one side or both sides of the tube hole along the radial direction of the tube hole, wherein one end of the first guide groove extends to the edge of the plate-like body and the other end extends to the flange;

[0010] The first hollow structure is distributed on both sides of the first guide groove.

[0011] Further optionally, a guide gap is formed at one end of the first guide groove away from the tube hole, and the first guide gap is used to prevent the water layer in the guide groove from gathering to form a bridge liquid.

[0012] Further optionally, the plate-shaped body is also formed with a second guide groove;

[0013] The second guide groove is transversely opened on the upper side and / or the lower side of the fin unit plate body, and the second guide groove runs through the left and right sides of the fin unit plate body.

[0014] Further optionally, a second guide gap is formed at one end or both ends of the second guide groove, and the second guide gap is used to prevent the water layer in the guide groove from gathering to form a bridge liquid.

[0015] Further optionally, the upper and lower parts of the fin unit body are bent toward the same side at a preset angle with the tube hole as the center so that the tube hole opening portion protrudes toward a direction perpendicular to the fin unit body.

[0016] The preset angle is 5°-30°.

[0017] Further optionally, the plate-like body is further formed with a second hollow structure.

[0018] The second hollow structure is opened on the plate-like body along the vertical direction and is distributed on the upper part and / or the lower part of the plate-like body.

[0019] Further optionally, a plate area expansion structure is formed on the plate-shaped body, including:

[0020] A protrusion and / or a groove formed on the upper part of the fin unit plate;

[0021] and / or, a protrusion and / or a groove formed on the lower part of the fin unit plate body.

[0022] Further optionally, there are two or more fin units, and the upper part of the nth fin unit and the lower part of the (n+1)th fin unit are connected, wherein n is a positive integer.

[0023] A second aspect of the present invention discloses a heat exchanger, comprising the heat exchange fins described in any one of the above.

[0024] A third aspect of the present invention discloses an air conditioner, comprising the heat exchange fins as described in any one of the above; or, the heat exchanger as described above.

[0025] Beneficial effects: The present invention improves the heat exchange fins by designing the main structure of the heat exchange fins as flat sheets with hollow structures on the fins, thereby enhancing air flow disturbance and reducing the increase in wind resistance, thereby effectively improving the air side heat exchange coefficient; the fin structure has a plate area expansion structure (protrusion or groove arrangement) at the fin away from the tube hole, which effectively increases the heat exchange area and improves the air flow disturbance effect on both sides of the plate body, thereby further improving the heat exchange effect; under frosting conditions, it can avoid water bridge accumulation and frost layer blockage, and can improve the year-round performance coefficient of the room air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present invention will become more apparent by describing in detail its exemplary embodiments with reference to the accompanying drawings. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0027] Figure 1 A schematic diagram of a heat exchange fin according to an embodiment is shown;

[0028] Figure 2 A top view of a heat exchange fin according to an embodiment is shown;

[0029] Figure 3 A side view of a heat exchange fin according to an embodiment is shown;

[0030] Figure 4 A schematic diagram showing the flow direction of airflow at the protrusions and grooves of an embodiment is shown;

[0031] Figure 5 A front view of a fin unit according to an embodiment is shown;

[0032] Figure 6 A side view of a heat exchanger is shown according to one embodiment.

[0033] In the figure: 1. tube hole; 2. first hollow structure; 3. second hollow structure; 4. groove; 5. first guide groove; 6. second guide groove; 7. first guide notch; 8. second guide notch; 9. heat exchange tube; 10. heat exchange fin; A. fin unit length; B. first guide groove width; C. second guide groove width; D. fin unit width. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0035] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" 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 other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0036] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0038] In order to illustrate the technical solution in the present invention, Figure 1-Figure 6 As shown, the following specific embodiments are provided.

[0039] Example 1

[0040] In this embodiment, a heat exchange fin is provided, the heat exchange fin comprising: at least one fin unit,

[0041] The fin unit has a plate-shaped body, and the plate-shaped body is a curved plate;

[0042] The plate-like body is provided with a tube hole 1 at its convex top and a flange is formed around the tube hole 1, and the convex extension direction of the flange is the same as the convex direction of the curved plate;

[0043] The plate-like body is formed with a first hollow structure 2 around the tube hole, which extends outward in a divergent manner with the tube hole 1 as the center;

[0044] The plate-like body is provided with a first guide groove 5 on one or both sides of the tube hole 1 along the radial direction of the tube hole, and one end of the first guide groove 5 extends to the edge of the plate-like body, and the other end extends to the flange;

[0045] The first hollow structures 2 are distributed on both sides of the first guide groove 5 .

[0046] The hollow structure can disturb and mix the heat exchange airflow between the heat exchange fins; a plate area expansion structure is formed on the fin unit, and the plate area expansion structure is used to expand the heat exchange area on both sides of the plate-shaped body (plate body) and disturb the heat exchange airflow on both sides of the plate body. In addition, the design of the guide groove and the flange can also enhance the heat conduction between the fin and the copper tube, and at the same time have a certain disturbing effect on the airflow. After the guide groove is connected to the flange, the condensed droplets at the flange can be quickly discharged with the airflow. The improved fin unit not only meets the requirements of lightness, thinness and miniaturization based on the hollow structure, guide groove and flange, and plate area expansion structure, but also has a good heat exchange effect.

[0047] In this embodiment, the main body of the heat exchange fin is designed as a plate-like structure, and a certain number of hollow structures are arranged on the surface of the fin, which significantly enhances the airflow disturbance at the inlet section and between the fins. The addition of the plate area expansion structure effectively increases the heat exchange area on the fin side, and at the same time generates lateral and longitudinal airflow disturbances, effectively improving the heat exchange coefficient on the fin side.

[0048] In some optional embodiments, a guide groove is provided on the fin unit, and the guide groove is used to collect condensation droplets generated during the heat exchange process. The guide groove has two functions: first, it increases the path of airflow through the fins and enhances airflow disturbance; second, this structure is conducive to the accumulation of defrost water and condensation water on the second guide groove 6 and the first guide groove 5, and then discharged from the fins along the guide groove.

[0049] The diversion trough includes:

[0050] The first guide groove 5 is transversely opened on one side or both sides of the tube hole 1, and the transverse opening direction of the first guide groove 5 coincides with the radial direction of the tube hole 1. Based on the fact that the plate body of the heat exchange fin has a certain protrusion at the tube hole 1, the first guide groove 5 in the middle of the fin can be protruded in the flange direction, which is more conducive to collecting condensation droplets. Preferably, a guide notch is opened at one end of the first guide groove 5 away from the tube hole 1, and the first guide notch 7 is used to prevent the water layer in the guide groove from gathering to form a bridge liquid.

[0051] The diversion channel also includes:

[0052] The second guide groove 6 is transversely opened on the upper side and / or lower side of the fin unit plate body, and the second guide groove 6 runs through the left and right sides of the fin unit plate body. Preferably, a second guide notch 8 is opened at one or both ends of the second guide groove 6, and the second guide notch 8 is used to prevent the water layer in the guide groove from gathering to form a bridge liquid.

[0053] In this embodiment, by arranging guide grooves parallel to the airflow direction at the upper and lower ends of the fin unit and the tube hole 1, the first guide groove of the fin protrudes in the flange direction and cooperates with the guide groove, which is conducive to the condensation droplets flowing into the guide grooves in the middle and at the upper and lower ends, and being carried away from the fin surface by the airflow, thereby improving the drainage efficiency of the fin surface. In addition, notches are set at both ends of the guide groove, and the fins with poor heat exchange effects on both sides of the guide groove are cut off to improve the heat exchange efficiency of the fin side; the overall structure prevents the water layer from gathering to form a liquid bridge, effectively improving the performance of the heat exchanger under frosting conditions.

[0054] In some optional modes, the heat exchange fins are bent at a preset angle to the same side with the tube hole 1 as the center, so that the tube hole opening portion protrudes in a direction perpendicular to the fin unit body. Preferably, the preset angle is 5°-30°.

[0055] In some optional ways, a hollow structure is arranged in the radial direction of the tube hole 1 and in the direction perpendicular to the airflow on the side away from the tube hole 1. Specifically, the hollow structure includes:

[0056] A first hollow structure 2 is provided on the fin unit plate body along the radial direction of the tube hole 1 around the tube hole 1; and / or,

[0057] A second hollow structure 3 is opened on the fin unit plate body along the vertical direction and distributed on the upper part and / or the lower part of the fin unit plate body.

[0058] In this embodiment, in order to ensure the strength and service life of the fin, the length of the hollow structure on the fin shall not be greater than 1 / 3 of the fin unit length A, the first guide groove width B shall not be greater than 1.25 times the diameter of the tube hole 1, the second guide groove width C shall generally not be greater than 1 / 5 of the fin unit length A, and the distance between the first guide groove and the second guide groove shall not be greater than the fin unit width D. It should be noted that in this embodiment, in order to facilitate the description of the heat exchange fin, the following is used. Figure 4 In the description, the left and right directions are width and the top and bottom directions are length.

[0059] In some optional modes, a plate area expansion structure is provided at a location far away from the tube hole 1 where the heat exchange effect is low. Preferably, the plate area expansion structure adopts a discontinuous protrusion or groove structure.

[0060] Specifically, the board area expansion structure includes:

[0061] The protrusions and / or grooves 4 are formed on the upper part of the fin unit plate;

[0062] And / or, protrusions and / or grooves 4 formed at the lower part of the fin unit plate body.

[0063] It should be noted that when there are two or more fin units, the upper part of the nth fin unit is connected to the lower part of the n+1th fin unit, where n is a positive integer. Figure 1 As shown, after continuous extension and connection, it becomes a long strip-shaped plate-like structure.

[0064] The heat exchange fin can avoid low heat exchange efficiency due to increased wind resistance on the fin side of the heat exchanger; it can also avoid the problem of condensation water on the fin surface forming a liquid bridge between the fins and reducing the heat exchange effect due to untimely drainage in wet conditions.

[0065] Example 2

[0066] Based on the heat exchange fins in Example 1, a heat exchanger is provided in this embodiment, and the heat exchanger includes any one of the above heat exchange fins. The heat exchange fins are arranged in layers and copper tubes are passed through the tube holes 1. The heat exchanger can be used for heat exchange in an air conditioner.

[0067] Furthermore, this embodiment further illustrates the heat exchanger in combination with the specific structure of the heat exchange fins in Embodiment 1.

[0068] As shown in FIG. 1 , a tube hole 1 , a first hollow structure 2 , a second hollow structure 3 , a protrusion or groove 4 , a first guide groove 5 and a first guide notch 7 , a second guide groove 6 and a second guide notch 8 are formed on the heat exchange fin.

[0069] Since the heat exchange fin body used in the heat exchanger is a plate-like structure, the first guide groove 5 protrudes in the direction of the tube hole flange ( Figure 3 ), which enhances the air flow at the inlet section. A certain number of first hollow structures 2 are arranged along the radial direction of the tube holes on both sides of the first guide groove 5. The heat exchange is enhanced by breaking the air boundary layer, which can significantly improve the air side heat transfer coefficient under non-frosting conditions and increase the wind resistance slightly. At the same time, the hollow structure has the effect of guiding flow. Under frosting conditions, it can prevent droplets from gathering between the fins to form liquid bridges and block air circulation. It can also avoid double-layer blockages, thereby improving the heat transfer and annual performance coefficient of the air conditioner under frosting conditions. In addition, a number of second hollow structures 3 are arranged on the fins adjacent to the second guide groove in a direction perpendicular to the incoming flow, and their functions are the same as those of the hollow structures mentioned above. A protrusion or groove 4 is provided between two adjacent hollow structures 3 perpendicular to the incoming flow direction. The airflow will move against the wall at the groove, and a local vortex will be generated, which enhances the airflow disturbance at that location on the fin surface and improves the heat exchange capacity. Figure 3As shown. The second guide groove 6 is located on the upper and lower sides of the fin unit, which has the same function as the middle guide 5. Under frosting conditions, the defrost water flows into the guide groove along the fin, and is then carried away from the fin surface by the drag of the airflow, effectively improving the efficiency of the defrost water discharged from the fin surface. The cooperation between the second guide groove 6 and the first guide groove 5 is conducive to the defrost water staying and gathering at the connection between the fin body and the guide groove, and flowing out of the fin surface along the gas flow direction, reducing the retention of condensation droplets on the fin surface, thereby reducing wind resistance and improving the heat exchange effect of the heat exchanger. Notches are set on both sides of the first guide groove 5 and the second guide groove 6, namely the first guide notch 7 and the second guide notch 8. The notch part is the fin with poor heat exchange effect, and the part with poor heat exchange on both sides of the guide groove is cut off, which effectively improves the heat exchange efficiency on the fin side and accelerates the drainage process.

[0070] like Figure 5 As shown, the heat exchanger of this embodiment is mostly used in outdoor heat exchangers. The length of the hollow structure on the fin shall not be greater than 1 / 3 of the fin unit length A, the first guide groove width B shall not be greater than 1.25 times the tube hole diameter, the second guide groove width C shall generally not be greater than 1 / 5 of the fin unit length A, and the distance between the first guide groove and the second guide groove shall not be greater than the fin unit width D.

[0071] like Figure 5 As shown, the heat exchanger of this embodiment is a row, consisting of a heat exchange tube 9 and a heat exchange fin 10. There are a number of tube holes on the fin, and the same fin structure is symmetrically arranged on the upper and lower sides of each tube hole. The diameter of the tube hole is the same as the outer diameter of the heat exchange tube. The heat exchange fin 10 is tightly sleeved on the outside of the heat exchange tube 9, and the inside of the heat exchange tube is refrigerant. There are a number of fins and they are arranged in parallel along the heat exchange tube. The shape and arrangement structure of each row of fins are the same.

[0072] It should be noted that the number of hollow structures in the above embodiment is not limited to 6 as shown in the drawings, but can be determined according to actual conditions; the number of rows of heat exchange tubes 9 (such as copper tubes) of the heat exchanger is not limited to one row as shown in the drawings, but can be determined according to actual conditions; the number of protrusions or grooves of the heat exchanger is not limited to 3 as shown in the drawings, but can be adjusted according to actual conditions; the guide notch is not limited to the trapezoidal shape shown in the drawings, but can be determined according to actual conditions.

[0073] The heat exchange fins and heat exchanger in this embodiment can not only effectively improve the air side heat exchange coefficient under non-frosting conditions, but also solve the drainage problem under frosting conditions and improve the heat exchange effect.

[0074] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A heat exchange fin, It is characterized in that The heat exchange fin comprises: at least one fin unit, The fin unit has a plate-shaped body, and the plate-shaped body is a curved plate; The plate-like body is provided with a tube hole at its convex top and a flange is formed around the tube hole, and the convex extending direction of the flange is the same as the convex direction of the plate-like body; The upper and lower parts of the fin unit body are bent toward the same side at a preset angle with the tube hole as the center so that the tube hole opening portion protrudes toward a direction perpendicular to the fin unit body; The plate-like body forms a first hollow structure around the tube hole, which extends radiating outward from the tube hole as the center; The plate-like body is provided with a first guide groove on one side or both sides of the tube hole along the radial direction of the tube hole, wherein one end of the first guide groove extends to the edge of the plate-like body and the other end extends to the flange; The first hollow structure is distributed on both sides of the first guide groove; The plate-shaped body is also formed with a second guide groove; The second guide groove is transversely opened on the upper side and / or the lower side of the fin unit plate body, and the second guide groove runs through the left and right sides of the fin unit plate body.

2. The heat exchange fin according to claim 1, It is characterized in that A flow guiding notch is formed at one end of the first flow guiding groove away from the tube hole.

3. The heat exchange fin according to claim 1, It is characterized in that A second guide gap is formed at one end or both ends of the second guide groove.

4. The heat exchange fin according to claim 1, It is characterized in that The preset angle is 5°-30°.

5. The heat exchange fin according to claim 1, It is characterized in that The plate-like body is also formed with a second hollow structure. The second hollow structure is opened on the plate-like body along the vertical direction and is distributed on the upper part and / or the lower part of the plate-like body.

6. The heat exchange fin according to claim 1, It is characterized in that The plate-shaped body is also provided with a plate area expansion structure, including: A protrusion and / or a groove formed on the upper part of the fin unit plate; and / or, a protrusion and / or a groove formed on the lower part of the fin unit plate body.

7. The heat exchange fin according to any one of claims 1 to 6, It is characterized in that There are two or more fin units, and the upper part of the nth fin unit is connected to the lower part of the n+1th fin unit, wherein n is a positive integer.

8. A heat exchanger, It is characterized in that The heat exchanger comprises the heat exchange fins according to any one of claims 1 to 7.

9. An air conditioner, It is characterized in that The air conditioner comprises the heat exchange fins described in any one of claims 1 to 7; or the heat exchanger described in claim 8.

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