Heat exchange assembly and micro-channel heat exchanger

Abstract

The utility model discloses a heat exchange component and microchannel heat exchanger relates to heat exchanger technical field, including a plurality of flat tubes and a plurality of fin that are arranged between the adjacent flat tubes at interval, the both sides of fin are respectively fixed on the corresponding flat tubes, the fin includes a plurality of crest part and a plurality of trough part, the crest part is fixed on the corresponding flat tube, and the trough part is fixed on the crest part. The wave crest parts and the wave trough parts are alternately arranged, the length direction of the wave crest parts is consistent with the length direction of the flat pipes, and a water outlet penetrating through the fin in the thickness direction of the fin is formed in one end of the fin. According to the heat exchange assembly, condensate water can be discharged conveniently, and the heat exchange effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchange component and a microchannel heat exchanger. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid. It is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used.

[0003] A microchannel heat exchanger is a heat exchanger with multiple microchannels in a flat tube. It has made great progress in replacing condensers in single-cooling products, but its application in heat pump air conditioners is still very rare and is still in the research stage. The main reason is that the condensed water in the microchannel heat exchanger in the related technology is not easy to discharge, resulting in frequent frost and defrosting of the outdoor heat exchanger during the winter heating process, which seriously affects the heating effect of the air conditioner. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a heat exchange component and a heat exchanger, which have the advantages of convenient condensed water discharge and good heat exchange effect.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A heat exchange component includes a plurality of flat tubes and a plurality of fins arranged at intervals between adjacent flat tubes, the two sides of the fins are respectively fixed to the corresponding flat tubes, the fins include a plurality of crests and a plurality of troughs, the crests and troughs are alternately arranged, the length direction of the crests is consistent with the width direction of the flat tubes, and a water outlet is formed at one end of the fin and penetrates the fin along the thickness direction of the fin.

[0007] In the present application, the heat exchange assembly includes a flat tube carrying a heat transfer medium and a fin for improving the heat exchange efficiency. As the heat exchanger continues to work, condensed water will appear on the fin. The fin has a plurality of corrugations extending along the ventilation direction, and the corrugations include alternately arranged crests and troughs. The troughs form a straight water collection tank along the ventilation direction. The condensed water on the crests slides down to the troughs with lower terrain under the action of gravity, and finally the condensed water on the fins is collected in the water collection tank. The fin includes a windward side and a leeward side close to the water outlet. The wind blows from the windward side of the fin to the leeward side and blows the condensed water to the leeward side. The leeward side is provided with a water outlet, that is, the condensed water is finally collected to the water outlet under the action of wind force and discharged from the fin. The heat exchange assembly in the present application has a good condensed water discharge effect, and also improves the heat exchange efficiency of the heat exchange assembly. In addition, the heat exchange assembly improves the heat exchange performance and the energy efficiency ratio of the heat exchanger, so the overall size of the heat exchanger can be correspondingly reduced, and the cost is greatly reduced. The present application adopts the method of setting water outlets and corrugations on the fins to obtain a fin structure with better drainage effect and more practicality. Multiple fins are repeatedly arranged along the length direction of the flat tube, and the number of repetitions depends on the total length of the flat tube, which is actually adjusted according to the design of the product.

[0008] Optionally, the shortest distance between the edge of the water outlet and the inner wall of the flat tube side satisfies the following relationship:

[0009] x≥h / n

[0010] Among them, h is the width of the fin, n is the number of wave peaks, and x is the shortest distance between the edge of the water outlet and the inner wall of the flat tube side.

[0011] In the present application, the shortest distance between the edge of the water outlet and the inner wall of the flat tube side satisfies x ≥ h / n, and the number of wave peaks is the number of corrugations, that is, the shortest distance between the edge of the water outlet and the inner wall of the flat tube side is at least the width of one corrugation. In the present application, the two sides of the fin are fixed to the inner wall of the side of the flat tube, that is, the width of the fin is the straight-line distance between the two opposite side walls of adjacent flat tubes. When the width of the water outlet is too large, the strength of the fin is reduced. By reducing the width of the water outlet, the shortest distance between the edge of the water outlet and the inner wall of the flat tube side can be increased, and the structural strength of the fin can be increased.

[0012] Optionally, the water outlets of adjacent fins are arranged relative to each other.

[0013] The water outlets of adjacent fins are arranged opposite to each other, which can increase the speed of condensed water being discharged from the heat exchanger. The condensed water on the fins will not fall onto the surface of the adjacent fins, but will directly pass through the water outlets of the adjacent fins.

[0014] Optionally, the water outlet is configured as an oblong, and the water outlet is located in the middle of the width direction of the fin, and the length direction of the water outlet is consistent with the length direction of the fin.

[0015] The water outlet is located in the middle of the fin, and the distances between the two sides of the water outlet and the side wall of the flat tube are equal, so that most of the condensed water can enter the water outlet under the action of wind. A small amount of water that does not pass through the water outlet will continue to slide through the troughs on both sides of the fin and finally be discharged from the end of the fin.

[0016] Optionally, the trough portions of adjacent fins are arranged relative to each other.

[0017] The troughs and crests of adjacent fins are arranged relative to each other, thereby improving the condensed water discharge effect and the heat exchange efficiency of the heat exchange component.

[0018] Optionally, the lowest point of the trough portion is connected to the side wall of the flat tube, and the angle between the tangent line of the lowest point of the trough portion and the side wall of the flat tube is 90°.

[0019] When the lowest point of the trough is connected to the side wall of the flat tube, the connection between the flat tube and the fin is the trough of the accumulated water. The angle between the tangent line of the lowest point of the trough and the side wall of the flat tube is 90°. The accumulated water can flow and discharge from the fin under the action of wind.

[0020] Optionally, the highest point of the crest portion is connected to the side wall of the flat tube, and the angle between the tangent line of the highest point of the crest portion and the side wall of the flat tube is 90°.

[0021] When the highest point of the crest is connected to the side wall of the flat tube, the connection between the flat tube and the fin is the crest where no water accumulates, and the condensed water flows from the crest to the trough, and then flows and is discharged from the fin under the action of wind.

[0022] Optionally, the heat exchange assembly further includes a fan, and the fan is disposed at an end of the fin away from the water outlet.

[0023] The fan is arranged at the end of the fin away from the water outlet, that is, the fan is arranged close to the windward side. The airflow blown out by the fan moves from the windward side to the leeward side and helps the accumulated water in the sump to flow to the water outlet on the leeward side or be discharged from the end of the fin.

[0024] Optionally, an end of the fin away from the water outlet is higher than an end of the fin close to the water outlet.

[0025] The end of the fin away from the water outlet is higher than the end of the fin close to the water outlet, so that the condensed water can flow to the water outlet faster under the action of gravity, thereby improving the drainage efficiency. At this time, the discharge of the condensed water relies on the dual effects of gravity and wind.

[0026] In addition, the present invention also provides a microchannel heat exchanger, including a header and a heat exchange assembly, wherein the heat exchange assembly includes the aforementioned heat exchange assembly. The reasoning process of the beneficial effects of the microchannel heat exchanger provided by the present invention and the aforementioned heat exchange assembly is similar, and will not be repeated here.

[0027] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the heat exchange component of the embodiment of the utility model;

[0030] Figure 2 for Figure 1 A top view of

[0031] Figure 3 A schematic diagram of a connection method of flat tubes and fins in an embodiment of the utility model;

[0032] Figure 4 for Figure 3 The structural diagram at A in the middle;

[0033] Figure 5 This is a schematic diagram of another connection method between the flat tube and the fin in the embodiment of the utility model;

[0034] Figure 6 for Figure 5 The structural diagram at B in the middle;

[0035] Figure 7 This is a schematic diagram of the use state of the heat exchange component of the utility model after being flipped 90°.

[0036] Among them, 1, flat tube; 2, fin; 21, corrugation; 211, wave crest; 212, wave trough; 22, windward side; 23, leeward side; 24, water outlet. DETAILED DESCRIPTION

[0037] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0038] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0039] In the related art, the fins of the microchannel heat exchanger are placed in a direction perpendicular to the flat tubes. When the flat tubes are horizontal, they hinder the condensed water from flowing down. When the flat tubes are placed vertically, the fins are placed horizontally, and the tension between the fins and the condensed water is small. In addition, the surface roughness of the microchannel heat exchanger after brazing is large, and the contact angle with the condensed water is large, so it is very difficult to drain. At present, there are generally two ways to improve the condensed water drainage and heat exchange effect:

[0040] 1. The fin adopts a column rib structure, which can reduce the contact angle between condensed water and the fin and eliminate the capillary effect. However, the column rib strength also decreases with the decrease of diameter, the processing difficulty increases, the process is complicated, the production cost is high, and it is difficult to achieve a breakthrough improvement;

[0041] 2. The fins adopt a plug-in structure. The fin monomer is integrated from top to bottom. Slots are made on the fins and the flat tubes are inserted into the slots. The fins are placed vertically and the flat tubes are placed horizontally. However, this structure has a large number of fins and needs to be inserted one by one, which makes the production process complicated. In addition, the fins are a continuous structure, which has requirements for the strength and thickness of a single fin. And because the flat tubes are placed horizontally, defrosting water or condensed water will be retained. Therefore, it has not been widely adopted in the market yet.

[0042] Example:

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a heat exchange component is provided, including a plurality of flat tubes 1 and a plurality of fins 2 arranged at intervals between adjacent flat tubes 1, the two sides of the fins 2 are respectively fixed to the corresponding flat tubes 1, the fins 2 include a plurality of crests 211 and a plurality of troughs 212, the crests 211 and the troughs 212 are alternately arranged, the length direction of the crests 211 is consistent with the width direction of the flat tubes 1, and a water outlet 24 is formed at one end of the fin 2 and penetrates the fin 2 along the thickness direction of the fin 2.

[0044] The flat tube 1 carries a heat transfer medium, and both sides of the fin 2 are fixed to the side inner wall of the flat tube 1, that is, the distance between adjacent flat tubes 1 is the same as the width of the fin 2. Multiple fins 2 are arranged up and down between adjacent flat tubes 1, and a fluid channel is formed between adjacent fins 2 to allow cooling gas or condensed water to pass through. The gas passes through the fluid channel and exchanges heat with the fin 2 and the flat tube 1. When the temperature of the fin 2 is lower than the dew point temperature of the environment, condensed water will be formed. In order to prevent the condensed water on the fin 2 from freezing, the condensed water needs to be discharged as soon as possible, thereby improving the heat exchange effect of the heat exchanger. In this embodiment, the corrugation 21 on the fin 2 includes a higher crest portion 211 and a lower trough portion 212. The trough portion 212 forms a straight water collection trough along the ventilation direction. The condensed water on the crest portion 211 slides down to the lower trough portion 212 under the action of gravity, and finally the condensed water on the fin 2 is collected in the water collection trough. The fin 2 includes a windward side 22 and a leeward side 23. The wind blows from the windward side 22 of the fin 2 to the leeward side 23 and blows the condensed water to the leeward side 23. A water outlet 24 is provided at the leeward side 23, that is, the condensed water is finally gathered to the water outlet 24 under the action of wind force and discharged from the fin 2.

[0045] In this embodiment, the fin 2 is formed with 6 corrugations 21, and one corrugation 21 includes a crest portion 211 located at a high position and a trough portion 212 located at a low position. In other embodiments, the number of corrugations 21 of the fin 2 may also be 7, 8, etc. In this embodiment, the fin 2 with corrugations 21 is formed by bending a flat fin 2 multiple times, and the fin 2 is an aluminum part. Of course, in other embodiments, it can also be made by other processes such as casting, and the material of the fin 2 can also be other metals with good thermal conductivity such as stainless steel.

[0046] The shortest distance between the edge of the water outlet 24 and the inner wall of the flat tube 1 satisfies the following relationship:

[0047] x≥h / n

[0048] Wherein, h is the width of the fin 2 , n is the number of the wave crests 211 , and x is the shortest distance between the edge of the water outlet 24 and the inner wall of the flat tube 1 .

[0049] In this embodiment, n is 6, and the shortest distance between the edge of the water outlet 24 and the inner wall of the flat tube 1 satisfies x≥h / 6, that is, the shortest distance between the edge of the water outlet 24 and the inner wall of the flat tube 1 is at least the width of a corrugation 21. In this application, the two sides of the fin 2 are fixed to the inner wall of the flat tube 1, that is, the width of the fin 2 is the straight-line distance between the two opposite walls of the adjacent flat tubes 1. When the width of the water outlet 24 is too large, the strength of the fin 2 is reduced. By reducing the width of the water outlet 24, the shortest distance between the edge of the water outlet 24 and the inner wall of the flat tube 1 can be increased, and the structural strength of the fin 2 can be increased.

[0050] The water outlets 24 of adjacent fins 2 are arranged opposite to each other.

[0051] The water outlets 24 of adjacent fins 2 are arranged opposite to each other, which can increase the speed of condensed water being discharged from the heat exchanger, and the condensed water on the fins 2 will not fall onto the surface of the adjacent fins 2, but will directly pass through the water outlets 24 of the adjacent fins 2. Of course, in other embodiments, the water outlets 24 of adjacent fins 2 can also be arranged in a staggered manner.

[0052] The water outlet 24 is configured to be an oblong shape and is located in the middle of the fin 2 in the width direction. The length direction of the water outlet 24 is consistent with the length direction of the fin 2 .

[0053] The water outlet 24 is arranged in the middle of the width direction of the fin 2, and the distances between the two sides of the water outlet 24 and the side walls of the flat tube 1 are equal, so that most of the condensed water can enter the water outlet 24 under the action of wind. A small amount of water that does not pass through the water outlet 24 continues to slide toward the leeward side 23 through the troughs 212 on both sides of the fin 2, and is finally discharged from the end of the fin 2.

[0054] The troughs 212 of adjacent fins 2 are arranged opposite to each other.

[0055] The troughs 212 and crests 211 of adjacent fins 2 are arranged opposite to each other, which improves the condensate discharge effect and the heat exchange efficiency of the heat exchange assembly. Of course, in other embodiments, the troughs 212 of adjacent fins 2 can also be arranged alternately, and the crests 211 of adjacent fins 2 can also be arranged alternately.

[0056] like Figure 3 and Figure 4 As shown, in this embodiment, the lowest point of the trough portion 212 is connected to the side wall of the flat tube 1 and the angle between the tangent line of the lowest point of the trough portion 212 and the side wall of the flat tube 1 is 90°.

[0057] When the lowest point of the trough 212 is connected to the side wall of the flat tube 1, the connection between the flat tube 1 and the fin 2 is the trough 212 where the water accumulates, and the angle a between the tangent line of the lowest point of the trough 212 and the side wall of the flat tube 1 is 90°, the accumulated water can flow to the leeward side 23 under the action of wind and be discharged from the fin 2. The bad situation that the driving force of the wind cannot overcome the resistance of the water due to the small angle and the accumulated water will not occur.

[0058] In other embodiments, Figure 5 and Figure 6 As shown, the highest point of the wave crest portion 211 is connected to the side wall of the flat tube 1 and the angle between the tangent line of the highest point of the wave crest portion 211 and the side wall of the flat tube 1 is 90°.

[0059] When the highest point of the crest part 211 is connected to the side wall of the flat tube 1, the connection between the flat tube 1 and the fin 2 is the crest part 211 where no water accumulates, and the angle b between the tangent line of the highest point of the crest part 211 and the side wall of the flat tube 1 is 90°. Condensed water flows from the crest part 211 to the trough part 212, and then flows to the leeward side 23 under the action of wind force and is discharged from the fin 2.

[0060] The heat exchange assembly also includes a fan, which is arranged at one end of the fin 2 away from the water outlet 24.

[0061] The end of the fin 2 away from the water outlet 24 is the windward side 22, and the end of the fin 2 close to the water outlet 24 is the leeward side 23. That is, the fan is arranged close to the windward side 22, and the airflow blown by the fan moves from the windward side 22 to the leeward side 23 and helps the accumulated water in the water collection tank flow to the water outlet 24 on the leeward side 23 or be discharged from the end of the fin 2.

[0062] An end of the fin 2 away from the water outlet 24 is higher than an end of the fin 2 close to the water outlet 24 .

[0063] In the present embodiment, the end of the fin 2 away from the water outlet 24 is the windward side 22, and the end of the fin 2 close to the water outlet 24 is the leeward side 23. The flat tube 1 is placed vertically, and the fin 2 is placed perpendicular to the flat tube 1. At this time, the windward side 22 is flush with the leeward side 23, and the discharge of condensed water relies on the drive of wind force. In other embodiments, the windward side 22 can also be set higher than the leeward side 23, so that the condensed water can flow to the water outlet 24 faster under the action of gravity, thereby improving the drainage efficiency. If the flat tube 1 is placed vertically, the fin 2 is placed at an angle so that the windward side 22 is higher than the leeward side 23, and the discharge of condensed water relies on the dual drive of wind and gravity. The choice of these two installation methods mainly depends on the use scenario and installation angle of the fin 2.

[0064] When implementing this solution, the airflow direction in the heat exchange component is generally perpendicular to the gravity direction. Figure 7 As shown, the heat exchange component is turned over 90 degrees to make the gravity direction consistent with the airflow direction. At this time, only a very small wind speed is needed as an auxiliary effect to drain the condensed water.

[0065] The utility model also provides a microchannel heat exchanger, comprising a header and a heat exchange component, wherein the heat exchange component comprises the aforementioned heat exchange component.

[0066] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A heat exchange component, comprising a plurality of flat tubes (1) and a plurality of fins (2) arranged at intervals between adjacent flat tubes (1), wherein two sides of the fins (2) are respectively fixed to corresponding flat tubes (1), It is characterized in that The fin (2) comprises a plurality of wave crests (211) and a plurality of wave troughs (212), the wave crests (211) and the wave troughs (212) being arranged alternately, the length direction of the wave crests (211) being consistent with the width direction of the flat tube (1), and a water outlet (24) penetrating the fin (2) along the thickness direction of the fin (2) is formed at one end of the fin (2).

2. The heat exchange assembly according to claim 1, It is characterized in that The shortest distance between the edge of the water outlet (24) and the inner wall of the flat tube (1) satisfies the following relationship: x≥h / n Wherein, h is the width of the fin (2), n is the number of wave crests (211), and x is the shortest distance between the edge of the water outlet (24) and the inner wall of the flat tube (1).

3. The heat exchange assembly according to claim 2, It is characterized in that The water outlets (24) of adjacent fins (2) are arranged opposite to each other.

4. The heat exchange assembly according to claim 2, It is characterized in that The water outlet (24) is constructed in an oblong shape and is located in the middle of the width direction of the fin (2), and the length direction of the water outlet (24) is consistent with the length direction of the fin (2).

5. The heat exchange assembly according to claim 1 or 4, It is characterized in that The trough portions (212) of adjacent fins (2) are arranged opposite to each other.

6. The heat exchange assembly according to claim 1 or 4, It is characterized in that The lowest point of the trough portion (212) is connected to the side wall of the flat tube (1), and the angle between the tangent line of the lowest point of the trough portion (212) and the side wall of the flat tube (1) is 90°.

7. The heat exchange assembly according to claim 1 or 4, It is characterized in that The highest point of the wave crest portion (211) is connected to the side wall of the flat tube (1), and the angle between the tangent line of the highest point of the wave crest portion (211) and the side wall of the flat tube (1) is 90°.

8. The heat exchange assembly according to claim 1 or 4, It is characterized in that The heat exchange component also includes a fan, which is arranged at an end of the fin (2) away from the water outlet (24).

9. The heat exchange assembly according to claim 8, It is characterized in that An end of the fin (2) away from the water outlet (24) is higher than an end of the fin (2) close to the water outlet (24).

10. A microchannel heat exchanger, comprising a header and a heat exchange component, It is characterized in that The heat exchange component comprises the heat exchange component according to any one of claims 1 to 9.

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