Fin, finned heat exchanger and heat pump system

Abstract

The invention relates to a fin, a fin type heat exchanger and a heat pump system, the fin is applied to the fin type heat exchanger, and the fin is provided with a first edge, a second edge, a drainage groove and a mounting through hole; the first seamed edge and the second seamed edge are sequentially distributed in the air flow direction; the drainage groove comprises a water diversion part and a drainage part, the water diversion part extends in the flow direction of the airflow, the water diversion part is provided with a first end and a second end, the first end is close to or located on the first edge, the drainage part extends downwards in an inclined mode, the drainage part is provided with a third end and a fourth end, the third end is communicated with the second end, and the fourth end is communicated with the third end. The fourth end is close to or located on the second edge; the installation through holes are formed in the positions, where the drainage grooves are not formed, of the fins. By the adoption of the heat exchanger, the drainage capacity of the fins can be improved, then the frosting speed of the fins is delayed, and the overall heat exchange performance of the heat exchanger is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat exchange, and particularly to a fin, a finned heat exchanger and a heat pump system. Background Art

[0002] Finned heat exchangers are widely used in the outdoor units of heat pump systems. A finned heat exchanger includes refrigerant pipes and a plurality of fins. Low-temperature refrigerant flows in the refrigerant pipes, and the plurality of fins are arranged at intervals, and each fin is sleeved on the outer circle of the refrigerant pipe.

[0003] To ensure the heat exchange efficiency of the fins, the type of fins is usually selected as bridge fins. During the operation of the heat exchanger, the air carrying water vapor passes through the gap between two adjacent fins to achieve heat exchange. Since the temperatures of the fins and the refrigerant pipes are relatively low, the water vapor will undergo a phase change and adhere to the fins in the form of droplets.

[0004] However, the surface of the bridge fins is relatively rough, and water retention is likely to occur, that is, the droplets are difficult to leave the fins. Therefore, the droplets will further change into frost and adhere to the fins, resulting in the narrowing of the gap between two adjacent fins, or even being completely blocked by the frost layer, seriously affecting the heat exchange performance of the heat exchanger. Summary of the Invention

[0005] Embodiments of the present disclosure provide a fin, a finned heat exchanger and a heat pump system, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present disclosure provides a fin. The fin is applied to a finned heat exchanger, and the fin has a first edge, a second edge, a drainage groove and a mounting through hole;

[0007] The first edge and the second edge are sequentially distributed in the air flow direction;

[0008] The drainage groove includes a water guiding portion and a drainage portion. The water guiding portion extends along the air flow direction. The water guiding portion has a first end and a second end. The first end is close to or located on the first edge. The drainage portion extends obliquely downward. The drainage portion has a third end and a fourth end. The third end is communicated with the second end. The fourth end is close to or located on the second edge;

[0009] The mounting through hole is arranged at a position on the fin where the drainage groove is not arranged.

[0010] In a possible implementation manner, the fin has a plurality of mounting through holes and a plurality of drainage grooves;

[0011] The plurality of mounting through holes are spaced apart along a first direction. The first direction is perpendicular to the air flow direction;

[0012] The multiple drain grooves are located between two adjacent mounting through-holes and are distributed along the first direction. A preset angle is provided between the water diversion part and the drain part in each drain groove.

[0013] In a possible implementation, the preset angles corresponding to the multiple drain grooves are equal or gradually increase along the first direction.

[0014] In a possible implementation, the drain groove further includes a connecting part;

[0015] Both ends of the connecting part are respectively communicated with the second end and the third end, and the two ends of the connecting part are in smooth transition.

[0016] In a possible implementation, the fin further includes a first flat sheet area, which is located in the second direction of the mounting through-hole, and the second direction is the reverse direction of the air flow. The surface of the first flat sheet area has a hydrophilic coating;

[0017] The surface of the drain groove has a hydrophobic coating.

[0018] In a possible implementation, the fin further includes a second flat sheet area, which is located on the side of the mounting through-hole away from the first flat sheet area. The extending direction of the second flat sheet area is the same as the extending direction of the drain part, and the surface of the second flat sheet area has a hydrophilic coating.

[0019] In a possible implementation, the fin has a first wall surface and a second wall surface, and the drain grooves are both provided on the first wall surface and the second wall surface. The first wall surface and the second wall surface are two opposite wall surfaces in the axial direction of the mounting through-hole.

[0020] In a possible implementation, the drain groove is a V-shaped groove or an arc-shaped groove.

[0021] In a second aspect, an embodiment of the present disclosure provides a finned heat exchanger, which includes a refrigerant pipe and the fin in the first aspect and its possible implementations.

[0022] In a third aspect, an embodiment of the present disclosure provides a heat pump system, which includes a refrigerant pipe and the fin in the first aspect and its possible implementations or a finned heat exchanger in the second aspect and its possible implementations.

[0023] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0024] An embodiment of the present disclosure provides a fin applied to a fin - type heat exchanger. In this fin, a first edge and a second edge are distributed in sequence along the air - flow direction. The drainage groove includes a water - guiding part and a water - discharging part. The water - guiding part extends along the air - flow direction. The water - guiding part has a first end and a second end. The first end is close to or located on the first edge. The water - discharging part extends obliquely downward. The water - discharging part has a third end and a fourth end. The third end is communicated with the second end. The fourth end is close to or located on the second edge. The mounting through - hole is arranged at a position on the fin where the drainage groove is not arranged. In this way, a drainage groove is provided on the fin. The presence of the drainage groove can increase the contact area between the fin and the air flow and locally disturb the air flow, thereby improving the heat - transfer efficiency of the heat exchanger applying this fin. Moreover, since the extending direction of the water - guiding part is the same as the air - flow direction and the water - discharging part extends obliquely downward, the water - guiding part has little obstruction to the air flow, and the water - discharging part has a small obstruction to the air flow. Overall, the obstruction of the fin to the air flow is very limited, which can make the air flow velocity faster when the air passes through the fin, thereby delaying the frosting rate. In addition, when water vapor contacts the low - temperature fin, it will condense into droplets. The droplets flow into the water - guiding part, and then under the action of the air flow, the droplets flow along the air - flow direction towards the water - discharging part. The water - discharging part converges the droplets from the water - guiding part and the droplets flowing downward from above the water - discharging part. The mass of the droplets in the water - discharging part is relatively large. Due to the downward inclination of the water - discharging part, the droplets in the water - discharging part are discharged from the fin through the second edge under the combined action of gravity and wind force, which can prevent the droplets from adhering to the fin for a long time, that is, prevent the occurrence of the phenomenon of water accumulation on the wall surface, delay the frosting rate on the fin, and thus improve the heat - transfer performance of the heat exchanger.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0028] Figure 2 is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0029] Figure 3 is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0030] Figure 4It is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0031] Figure 5 It is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0032] Figure 6 It is a schematic structural diagram of a fin shown in an embodiment of the present disclosure;

[0033] Figure 7 It is a schematic structural diagram of a fin shown in an embodiment of the present disclosure.

[0034] Legend Explanation

[0035] 100, air flow direction; 101, first direction; 102, second direction;

[0036] 10, first wall surface; 20, second wall surface;

[0037] 1, first edge;

[0038] 2, second edge;

[0039] 3, drainage groove;

[0040] 31, water diversion part; 32, drainage part; 33, connecting part;

[0041] 31a, first end; 31b, second end; 32a, third end; 32b, fourth end;

[0042] 301, first drainage groove; 302, second drainage groove;

[0043] 3011, first water diversion part; 3012, first drainage part; 3021, second water diversion part; 3022, second drainage part;

[0044] 4, installation through hole;

[0045] 5, first flat plate area;

[0046] 6, second flat plate area. Detailed Embodiment

[0047] To make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0048] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second", "third" and similar terms used in the patent disclosure specification and claims of this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationships may also change accordingly.

[0049] Nowadays, finned heat exchangers are widely used in the outdoor units of heat pump systems due to advantages such as low layout cost and relatively high heat transfer efficiency. The finned heat exchanger includes refrigerant pipes and a plurality of fins. The plurality of fins are arranged at intervals, and each fin is sleeved on the outer circle of the refrigerant pipe. Low-temperature refrigerant flows in the refrigerant pipe, and the wall temperature of the refrigerant pipe is relatively low. Since the fins are in close contact with the outer wall of the refrigerant pipe, the temperature of the fins is also relatively low. In practice, air exchanges heat with the low-temperature fins and the low-temperature refrigerant pipe through the gaps between two adjacent fins. The temperature of the refrigerant in the pipe rises. During this process, since there is a certain amount of water vapor in the air, when the water vapor encounters the low-temperature fins and the low-temperature refrigerant pipe, a phase change occurs, changing from a gaseous state to a liquid state, and adhering to the fins in the form of liquid water. In heat exchangers, common fins include flat fins, bridge fins, and corrugated fins. For a heat exchanger using flat fins, it is not easy for water to accumulate on the fins, but since the contact area between the flat fins and the air is relatively small, the overall heat transfer efficiency of the heat exchanger decreases. For a heat exchanger using bridge fins, although the contact area between the fins and the air is relatively large and the heat transfer efficiency is relatively high, due to the relatively rough surface of the bridge fins, water accumulation is likely to occur, and the frosting rate on the fins is relatively fast, seriously affecting the heat transfer performance of the heat exchanger. For a heat exchanger using corrugated fins, due to the obvious obstructive effect of the corrugations on the air flow, the gas flow rate is relatively slow, which also leads to a relatively fast frosting rate on the fins, seriously affecting the heat transfer performance of the heat exchanger. Therefore, there is an urgent need for a kind of fin that has good heat transfer efficiency, is not easy to accumulate water, and has a relatively small obstructive effect on the air flow to improve the overall performance of the finned heat exchanger.

[0050] An embodiment of the present disclosure provides a fin, which is applied to a finned heat exchanger. The fin has a first edge 1, a second edge 2, a drainage groove 3, and a mounting through hole 4.

[0051] Among them, the first edge 1 and the second edge 2 are sequentially distributed in the air flow direction 100. The drainage groove 3 includes a water guiding portion 31 and a drainage portion 32. The water guiding portion 31 extends along the air flow direction 100. The water guiding portion 31 has a first end 31a and a second end 31b. The first end 31a is close to or located on the first edge 1. The drainage portion 32 extends obliquely downward. The drainage portion 32 has a third end 32a and a fourth end 32b. The third end 32a is communicated with the second end 31b. The fourth end 32b is close to or located on the second edge 2. The mounting through hole 4 is arranged at a position on the fin where the drainage groove 3 is not arranged.

[0052] In this way, a drainage groove 3 is provided on the fin. The presence of the drainage groove 3 can increase the contact area between the fin and the air flow, and can locally disturb the air flow, thereby improving the heat exchange efficiency of the heat exchanger applying the fin. Moreover, since the extending direction of the water guiding portion 31 is the same as the air flow direction 100 and the drainage portion 32 extends obliquely downward, the water guiding portion 31 has little hindrance to the air flow, and the drainage portion 32 has a small hindrance to the air flow. Overall, the fin has a very limited hindrance to the air flow, which can make the air flow rate faster when the air passes through the fin, thereby delaying the frosting rate. In addition, in the implementation, the fin is arranged in the vertical direction. When water vapor contacts the low-temperature fin, it will condense into droplets. The droplets flow into the water guiding portion 31, and then under the action of the air flow, the droplets flow along the air flow direction 100 towards the drainage portion 32. The drainage portion 32 converges the droplets from the water guiding portion 31 and the droplets flowing downward from above the drainage portion 32. The mass of the droplets in the drainage portion 32 is relatively large. Since the drainage portion 32 is inclined downward, the droplets in the drainage portion 32 are discharged from the fin through the second edge 2 under the combined action of gravity and wind force, which can avoid the droplets adhering to the fin for a long time, that is, prevent the occurrence of water accumulation on the wall surface, delay the frosting rate on the fin, and thereby improve the heat exchange performance of the heat exchanger.

[0053] Next, the specific structure of the fin will be introduced in detail:

[0054] As Figure 1 shown, the fin has a thin plate-like structure. The fin can be a rectangular thin plate-like structure, a circular thin plate-like structure, or an elliptical thin plate-like structure. The embodiments of the present disclosure do not limit this.

[0055] In one example, the fin is a rectangular thin plate-like structure. The fin has a first edge 1 and a second edge 2. The first edge 1 and the second edge 2 are sequentially distributed in the air flow direction 100. The air flow direction 100 can be the horizontal direction.

[0056] In implementation, the fin has a rectangular thin plate-like structure. The fins can be arranged in the vertical direction, and the first edge 1 and the second edge 2 can both be parallel to the vertical direction.

[0057] The fins can be formed by a cutting process. Of course, the fins can also be formed by any other reasonable process. The embodiments of the present disclosure do not limit the processing process of the fins.

[0058] As Figure 1 shown, the fin has a drainage groove 3 and a mounting through hole 4. The drainage groove 3 includes a water guiding portion 31 and a drainage portion 32.

[0059] See Figure 1 , the extending direction of the water guiding portion 31 is the same as the air flow direction 100. The water guiding portion 31 has a first end 31a and a second end 31b. The first end 31a is located on the first edge 1 of the fin, or the first end 31a is close to the first edge 1 of the fin. The extending direction of the water guiding portion 31 is the same as the air flow direction 100. That is to say, the connection line between the first end 31a and the second end 31b of the water guiding portion 31 is parallel to the air flow direction 100, and the connection line between any position on the water guiding portion 31 and the first end 31a is parallel to the air flow direction 100.

[0060] In this way, the first end 31a of the water guiding portion 31 is close to or located on the first edge 1 of the fin. The air flow flows through the fin in a direction parallel to the fin and exchanges heat with the fin. Part of the air flow directly flows in the water guiding portion 31, and the other part of the air flow flows on the wall surface of the fin. At the same time, since the extending direction of the water guiding portion 31 is the same as the air flow direction 100, the water guiding portion 31 will not cause an obstructive effect during this process.

[0061] See Figure 1 , the drainage portion 32 extends obliquely downward. The drainage portion 32 has a third end 32a and a fourth end 32b. The third end 32a is connected to the second end 31b of the water guiding portion 31, and the fourth end 32b is located on the second edge 2 of the fin or close to the second edge 2 of the fin.

[0062] In implementation, the fins are usually arranged in the vertical direction. When the fin is arranged perpendicular to the ground, the water guiding portion 31 can extend in the horizontal direction, and the drainage portion 32 extends obliquely downward. The third end 32a of the drainage portion 31 is connected to the second end 31b of the water guiding portion 31. The so-called drainage portion 32 extends obliquely downward, that is to say, the extending direction of the drainage portion 32 forms an angle with the horizontal direction, and the extending direction of the drainage portion 32 deviates downward by a certain angle relative to the horizontal direction.

[0063] In this way, during heat exchange, the droplets formed on the fin wall surface will slide under the action of gravity into the water diversion part 31 and the drainage part 32. Moreover, under the action of wind, the droplets in the water diversion part 31 will move along the direction from the first end 31a to the second end 31b, enter the drainage part 32 after passing through the second end 31b, and the droplets converge in the drainage part 32, increasing in mass. Since the drainage part 32 is inclined obliquely downward and the fourth end 32b of the drainage part 32 is close to or located on the second edge 2 of the fin, under the combined action of wind and gravity, it slides from the third end 32a to the fourth end 32b and finally leaves the fin through the second edge 2. The droplets will not stay on the fin for a long time, thereby delaying the frosting speed.

[0064] The groove shapes of the water diversion part 31 and the groove-shaped drainage part 32 can be the same or different. For example, the groove shapes of both the water diversion part 31 and the drainage part 32 are V-shaped or arc-shaped, or the groove shape of the water diversion part 31 is V-shaped and the groove shape of the drainage part 32 is arc-shaped. The present disclosure embodiment does not limit the groove shapes of the water diversion part 31 and the drainage part 32.

[0065] See Figure 1 , the installation through hole 4 is arranged at a position on the fin where there is no drainage groove 3 arranged. That is, there is no intersection relationship between the installation through hole 4 and the drainage groove 3.

[0066] In this way, the overall strength of the fin can be improved.

[0067] Exemplarily, the installation through hole 4 is a circular through hole. Correspondingly, the outer wall shape of the refrigerant pipe in the heat exchanger is also circular.

[0068] In this way, the processing difficulty of the installation through hole 4 is reduced, and for the heat exchanger, the frosting speed on the windward side of the refrigerant pipe can be delayed, thereby improving the heat exchange performance of the heat exchanger.

[0069] The installation through hole 4 can also be through holes of various other shapes. For example, the shape of the installation through hole 4 is a rectangular or oval through hole. The present disclosure embodiment does not limit the shape of the installation through hole 4.

[0070] In some possible embodiments, the fin has a plurality of installation through holes 4 and a plurality of drainage grooves 3.

[0071] As Figure 2 shown, the plurality of installation through holes 4 are spaced apart along the first direction 101, and the first direction 101 is perpendicular to the air flow direction 100. The plurality of drainage grooves 3 are located between two adjacent installation through holes 4 and are distributed along the first direction 101.

[0072] Among them, the first direction 101 can be the vertically downward direction.

[0073] In this way, each fin can be connected to the refrigerant pipe through a plurality of mounting through holes 4. Furthermore, heat exchange with air can occur at the positions on the fin corresponding to each mounting through hole 4. On the other hand, a plurality of drainage grooves 3 are provided on the fin, which can further increase the contact efficiency between the fin and the air and improve the heat exchange efficiency of the fin.

[0074] In one example, as Figure 2 shown, the plurality of mounting through holes 4 are spaced apart along the first direction 101. In the interval area between every two adjacent mounting through holes 4, a plurality of drainage grooves 3 are provided, and these drainage grooves 3 are all distributed along the first direction 101.

[0075] In this way, a plurality of drainage grooves 3 are provided between every two adjacent mounting through holes 4. That is to say, a plurality of water guiding parts 31 are provided between every two adjacent mounting through holes 4, which can prevent liquid droplets from flowing to the water guiding part 31 and then flowing out of the water guiding part 31 again, thereby improving the drainage efficiency of the fin.

[0076] In one example, a preset angle is provided between the water guiding part 31 and the drainage part 32 in each drainage groove 3.

[0077] Optionally, the preset angles between the water guiding parts 31 and the drainage parts 32 in the plurality of drainage grooves 3 can be equal.

[0078] In this way, the processing difficulty of the plurality of drainage grooves 3 can be reduced.

[0079] Optionally, the preset angles between the water guiding parts 31 and the drainage parts 32 in the plurality of drainage grooves 3 also gradually decrease along the first direction.

[0080] In implementation, when there are a plurality of mounting through holes 4 provided on the fin, the refrigerant pipe has a plurality of contact positions with the same fin. Since the refrigerant in the refrigerant pipe usually flows from bottom to top, for the same fin, the temperature of the fin gradually increases from bottom to top. On this basis, since the temperature of the lower region of the fin is lower, condensation water is more likely to appear at the position closer to the lower part of the fin.

[0081] In this way, among the plurality of drainage grooves 3, the preset angle between the water guiding part 31 and the drainage part 32 corresponding to the drainage groove 3 closer to the bottom is smaller. That is to say, the drainage part 32 corresponding to the drainage groove 3 closer to the bottom is closer to the vertical direction, and the drainage capacity of the drainage part 32 can be gradually improved from top to bottom.

[0082] See Figure 3, between two adjacent mounting through-holes 4, a first drainage groove 301 and a second drainage groove 302 are arranged in sequence along the first direction. The first drainage groove 301 includes a first water diversion portion 3011 and a first drainage portion 3012. The second drainage groove 302 includes a second water diversion portion 3021 and a second drainage portion 3022. There is a second preset angle between the second water diversion portion 3021 and the second drainage portion 3022, and a first preset angle between the first water diversion portion 3011 and the first drainage portion 3012. The second preset angle is smaller than the first preset angle.

[0083] Exemplarily, the second preset angle can be 60°, and the first preset angle can be 65°.

[0084] In some possible embodiments, the drainage groove 3 further includes a connecting portion 33.

[0085] The groove shape of the connecting portion 33 can be the same as that of the drainage portion 32, or can be different from that of the drainage portion 32. For example, the groove shapes of both the connecting portion 33 and the drainage portion 32 are V-shaped or arc-shaped, or the groove shape of the connecting portion 33 is V-shaped and the groove shape of the drainage portion 32 is arc-shaped. The present disclosure embodiment does not limit the groove shapes of the connecting portion 33 and the drainage portion 32.

[0086] In one example, as Figure 3 shown, both ends of the connecting portion 33 are respectively communicated with the second end 31b of the water diversion portion 31 and the third end 32a of the drainage portion 32, and both ends of the connecting portion 33 are smoothly transitioned.

[0087] In this way, the smoothness of the connection position between the water diversion portion 31 and the drainage portion 32 can be improved, the phenomenon of water accumulation at the connection position between the water diversion portion 31 and the drainage portion 32 can be avoided, and thus the overall heat exchange performance of the heat exchanger can be improved.

[0088] In some possible embodiments, the fin further includes a first flat fin region 5 and a second flat fin region 6.

[0089] As Figure 4 shown, the first flat fin region 5 is located in the second direction 102 of the mounting through-hole 4, the second direction 102 is the reverse direction of the air flow direction 100, the second flat fin region 6 is located on the side of the mounting through-hole 4 away from the first flat fin region 5, and the extending direction of the second flat fin region 6 is the same as the extending direction of the drainage portion 32.

[0090] In this way, for the heat exchanger, after the condensation tube and the fin are assembled, both the positions before and after the refrigerant tube are flat fins, which can increase the flow rate in the corresponding region, delay the frosting speed, and thus improve the overall heat exchange efficiency of the heat exchanger.

[0091] In one example, the surface of the first flat sheet region 5 has a hydrophilic coating, the surface of the second flat sheet region 6 has a hydrophilic coating, and the surface of the drain groove 3 has a hydrophobic coating.

[0092] In practice, the hydrophilicity and hydrophobicity of the coating are related to the contact angle between the liquid droplet and the coating surface when the liquid droplet is located on the coating surface. That is, the larger the contact angle between the liquid droplet and the coating surface, the more the liquid droplet tends to be a complete sphere when located on the coating surface, and the greater the hydrophobicity of the coating; the smaller the contact angle between the liquid droplet and the coating surface, the flatter the liquid droplet tends to be when located on the coating surface, and the greater the hydrophilicity of the coating. By providing hydrophilic coatings on the surfaces of the first flat sheet region 5 and the second flat sheet region 6, when water vapor liquefies in the first flat sheet region 5 and the second flat sheet region 6, the liquid droplets can cover the entire first flat sheet region 5 and the second flat sheet region 6 as much as possible to form a liquid film, thereby avoiding the accumulation of liquid droplets at a certain position, which may cause rapid frosting at that position, and thus overall delaying the frosting efficiency on the fin. At the same time, by providing hydrophilic coatings on the surfaces of the first flat sheet region 5 and the second flat sheet region 6, the occurrence of "water blowing phenomenon" and "ice blowing phenomenon" can be prevented, thereby improving the heat transfer efficiency of the fin. And by providing a hydrophobic coating on the surface of the drain groove 3, the liquid droplets converging in the drain groove 3 can flow backward rapidly, improving the drainage efficiency of the drain groove 3.

[0093] Exemplarily, the above-mentioned hydrophilic coating can be a silica coating or a fluorocarbon resin coating, and the above-mentioned hydrophobic coating can be a polyamide coating or polyacrylonitrile, etc. The specific types of the hydrophilic coating and the hydrophobic coating are not limited in the embodiments of the present disclosure.

[0094] In some possible embodiments, drain grooves 3 may be provided on both the first wall surface 10 and the second wall surface 20 of the fin.

[0095] As Figure 5 shown, the fin has a rectangular thin plate structure, and a plurality of mounting through holes 4 are provided on the fin. The fin has opposite first wall surface 10 and second wall surface 20 in the axial direction of the mounting through holes 4, and drain grooves 3 are provided on both the first wall surface 10 and the second wall surface 20.

[0096] In this way, drain grooves 3 are provided on both side wall surfaces of the fin, and the heat dissipation efficiency and drainage capacity of both side wall surfaces of the fin can be improved.

[0097] For the specific structure of the drain groove 3, reference can be made to the above introduction of the drain groove 3, and no repeated description will be given here.

[0098] In one example, the drain grooves 3 on the first wall surface 10 and the second wall surface 20 of the fin can be formed by a stamping and bending process.

[0099] In implementation, the stamping machine can stamp the fins in the first direction along the axis of the mounting through-hole 4 to form the drainage groove 3 on the first wall surface 10. Moreover, the stamping machine can stamp the fins in the second direction along the axis of the mounting through-hole 4 to form the drainage groove 3 on the second wall surface 20, where the second direction is the reverse of the first direction.

[0100] In this way, the efficiency of forming the drainage groove 3 on the first wall surface 10 and the second wall surface 20 of the fins can be improved.

[0101] In one example, the drainage groove 3 on the first wall surface 10 of the fins and the drainage groove 3 on the second wall surface 20 of the fins can be arranged in an overlapping manner.

[0102] See Figure 7 , the drainage groove 3 on the first wall surface 10 of the fins can form a convex structure corresponding to the second wall surface 20, and adjacent two convex structures constitute the drainage groove 3 on the second wall surface 20. Correspondingly, the drainage groove 3 on the second wall surface 20 of the fins can also form a convex structure corresponding to the first wall surface 10, and adjacent two convex structures constitute the drainage groove 3 on the first wall surface 10.

[0103] In this way, when multiple drainage grooves 3 are provided on the fins, the density of the drainage grooves 3 can be increased, and the processing difficulty of the drainage grooves 3 can be reduced.

[0104] In implementation, see Figure 7 , the drainage groove 3 on the first wall surface 10 of the fins and the drainage groove 3 on the second wall surface 20 of the fins are arranged in an overlapping manner, and adjacent multiple drainage grooves 3 form a wavy structure. Taking the drainage groove 3 as a V-shaped groove as an example, in the first wall surface 10, the included angle formed by the two side walls of the drainage groove 3 is the outer angle β2 of the drainage groove 3, and in the second wall surface 20, the included angle formed by the two side walls of the drainage groove 3 is the inner angle β1 of the drainage groove 3. The distance from the bottom of the drainage groove 3 to the eaves is the height H1 of the drainage groove 3, and the distance between the two eaves of the drainage groove 3 is the groove pitch L1 of the drainage groove 3.

[0105] Optionally, the size of the inner angle of the drainage groove 3 can be equal to the size of the outer angle.

[0106] In this way, the processing difficulty of the drainage groove 3 can be reduced.

[0107] In implementation, the inner angle and the outer angle of the drainage groove 3 are equal in size. The size of the inner angle of the drainage groove 3 is related to the contact angle of the surface coating of the drainage groove 3. The larger the contact angle, the smaller the inner angle β1 of the drainage groove 3 is required to prevent the liquid droplets from slipping downward and leaving the drainage groove 3. Correspondingly, the larger the contact angle, the larger the height H1 of the drainage groove 3 is required to prevent the liquid droplets from slipping downward and leaving the drainage groove 3. Technicians can set the reasonable sizes of the inner angle β1 and the outer angle β2 of the drainage groove 3 and set the reasonable height H1 of the drainage groove 3 according to the contact angle size of the coating actually used on the surface of the drainage groove 3. Similarly, technicians can adjust the size of the groove spacing L1 of the drainage groove 3 according to the spacing between adjacent installation through holes 4 and the number of drainage grooves 3 to be set. The embodiments of the present disclosure do not limit the sizes of the inner angle β1 and the outer angle β2 of the drainage groove 3, the size of the groove spacing L1, and the height H1 of the drainage groove 3.

[0108] The embodiment of the present disclosure provides a fin applied to a finned heat exchanger. In this fin, the first edge 1 and the second edge 2 are sequentially distributed along the air flow direction 100. The drainage groove 3 includes a water guiding portion 31 and a drainage portion 32. The water guiding portion 31 extends along the air flow direction 100. The water guiding portion 31 has a first end 31a and a second end 31b. The first end 31a is close to or located on the first edge 1. The drainage portion 32 extends obliquely downward. The drainage portion 32 has a third end 32a and a fourth end 32b. The third end 32a is communicated with the second end 31b. The fourth end 32b is close to or located on the second edge 2. The installation through hole 4 is arranged at a position on the fin where the drainage groove 3 is not arranged. In this way, the drainage groove 3 is arranged on the fin. The presence of the drainage groove 3 can increase the contact area between the fin and the air flow and locally disturb the air flow, thereby improving the heat exchange efficiency of the heat exchanger applying this fin. Moreover, since the extending direction of the water guiding portion 31 is the same as the air flow direction 100 and the drainage portion 32 extends obliquely downward, the water guiding portion 31 has almost no obstructive effect on the air flow, and the obstructive effect of the drainage portion 32 on the air flow is relatively small. Generally speaking, the obstructive effect of the fin on the air flow is very limited, which can make the air flow velocity faster when the air passes through the fin, thereby delaying the frosting rate. In addition, when water vapor contacts the low-temperature fin, it will condense into liquid droplets. The liquid droplets flow into the water guiding portion 31, and then under the action of the air flow, the liquid droplets flow along the air flow direction 100 towards the drainage portion 32. The drainage portion 32 converges the liquid droplets from the water guiding portion 31 and the liquid droplets flowing downward from above the drainage portion 32. The liquid droplets in the drainage portion 32 have a larger mass. Since the drainage portion 32 is inclined downward, the liquid droplets in the drainage portion 32 are discharged from the fin through the second edge 2 under the combined action of gravity and wind force, which can avoid the liquid droplets from adhering to the fin for a long time, that is, prevent the occurrence of the wall surface water storage phenomenon, delay the frosting rate on the fin, and thereby improve the heat exchange performance of the heat exchanger.

[0109] An embodiment of the present disclosure provides a finned heat exchanger, which includes the above-mentioned fins and refrigerant pipes.

[0110] Referring to Figure 5 , in this finned heat exchanger, a plurality of fins are arranged at intervals, and each fin is sleeved on the outer ring of a refrigerant pipe (not shown).

[0111] An embodiment of the present disclosure provides a heat pump system, which includes the above-mentioned fins or the above-mentioned heat exchanger.

[0112] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A fin, characterized in that, The fin is applied to a fin - type heat exchanger. The fin has a first edge (1), a second edge (2), a drainage groove (3) and a mounting through - hole (4); The first edge (1) and the second edge (2) are sequentially distributed in the air - flow direction (100); The drainage groove (3) includes a water - guiding part (31) and a water - draining part (32). The water - guiding part (31) extends along the air - flow direction (100). The water - guiding part (31) has a first end (31a) and a second end (31b). The first end (31a) is close to or located on the first edge (1). The water - draining part (32) extends obliquely downward. The water - draining part (32) has a third end (32a) and a fourth end (32b). The third end (32a) is communicated with the second end (31b), and the fourth end (32b) is close to or located on the second edge (2); The mounting through - hole (4) is arranged at a position on the fin where the drainage groove (3) is not arranged; 2. The fin according to claim 1, characterized in that, The fin has a plurality of mounting through - holes (4) and a plurality of drainage grooves (3); The plurality of mounting through - holes (4) are spaced apart along a first direction (101). The first direction (101) is perpendicular to the air - flow direction (100); The plurality of drainage grooves (3) are located between two adjacent mounting through - holes (4) and are distributed along the first direction (101). A preset angle is provided between the water - guiding part (31) and the water - draining part (32) in each drainage groove (3); 3. The fin according to claim 2, wherein The preset angles corresponding to the plurality of drainage grooves (3) are equal or gradually decrease along the first direction (101); 4. The fin according to claim 1, characterized in that, The drainage groove (3) further includes a connecting part (33); Both ends of the connecting part (33) are communicated with the second end (31b) and the third end (32a) respectively, and both ends of the connecting part (33) have a smooth transition; 5. The fin according to claim 1, characterized in that, The fin further includes a first flat - plate area (5). The first flat - plate area (5) is located in a second direction (102) of the mounting through - hole (4). The second direction (102) is the reverse direction of the air - flow direction (100). The surface of the first flat - plate area (5) has a hydrophilic coating; The surface of the drainage groove (3) has a hydrophobic coating; 6. The fin according to claim 5, wherein The fin further includes a second flat - plate area (6). The second flat - plate area (6) is located on a side of the mounting through - hole (4) away from the first flat - plate area (5). The extending direction of the second flat - plate area (6) is the same as the extending direction of the water - draining part (32). The surface of the second flat - plate area (6) has a hydrophilic coating; 7. The fin according to claim 1, characterized in that, The fin has a first wall surface (10) and a second wall surface (20). The drainage groove (3) is provided on both the first wall surface (10) and the second wall surface (20). The first wall surface (10) and the second wall surface (20) are two opposite wall surfaces in the axial direction of the mounting through - hole (4); 8. The fin according to any one of claims 1 to 7, characterized in that, The groove type of the drainage groove (3) is V - shaped or arc - shaped; 9. A finned heat exchanger, characterized in that, The fin - type heat exchanger includes a refrigerant pipe and the fin according to any one of claims 1 to 8.

10. A heat pump system, characterized in that, The heat pump system includes the fin according to any one of claims 1 to 8 or the finned heat exchanger according to claim 9.

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