Micro-channel heat exchange main body, micro-channel heat exchanger and air conditioner

Abstract

The invention relates to a micro-channel heat exchange main body, a micro-channel heat exchanger and an air conditioner in the technical field of micro-channel heat exchangers, and the micro-channel heat exchange main body comprises a plurality of heat exchange flat pipes which are arranged side by side up and down; each fin is vertically connected between the adjacent heat exchange flat tubes; the fins are provided with airflow guide structures, and the airflow guide structures form a plurality of first airflow channels which are continuously folded and inclined downwards from the air inlet sides to the air outlet sides of the fins. The airflow guiding structure guides airflow, under the blocking effect of the first airflow channels which are continuously folded and inclined downwards, the sections, where the airflow circulates, of the airflow on the fins are shrunk, the flowing speed of the airflow is further increased, the airflow can effectively scour and purge the root positions of the fins at the speed and in the upward direction, and the heat dissipation efficiency of the fins is improved. Therefore, the possibility of condensation water gathering, frosting and freezing at the root positions of the fins is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a microchannel heat exchange main body, a microchannel heat exchanger and an air conditioner. Background Art

[0002] In the field of air conditioning related technology, microchannel heat exchangers are widely used in air conditioning, refrigeration systems, heat pumps and other fields due to their high heat exchange efficiency, compact structure, light weight, low cost and other advantages. When the microchannel heat exchanger is used as an air-cooled evaporator, the refrigerant evaporates and absorbs heat in the flat tubes, making the surface temperature of the flat tubes and fins low. When air flows through the heat exchanger, the water vapor in the air condenses. Since the flat tubes of the microchannel heat exchanger are generally placed in parallel and the fins are placed vertically, condensed water accumulates at the root of the upper fins of the flat tubes, reducing the heat exchange efficiency of the heat exchanger. In addition, frost and ice will occur, further reducing the heat exchange efficiency of the heat exchanger. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the fin roots of the existing microchannel heat exchanger are prone to water accumulation, frost and ice formation, resulting in low heat exchange efficiency of the heat exchanger. A microchannel heat exchange body, a microchannel heat exchanger and an air conditioner are provided.

[0004] The present invention aims to design a microchannel heat exchange main body, comprising:

[0005] A plurality of heat exchange flat tubes, wherein the plurality of heat exchange flat tubes are arranged side by side vertically;

[0006] A plurality of fins, each of the fins being vertically connected between adjacent heat exchange flat tubes;

[0007] Among them, an airflow guiding structure is provided on the fin, and the airflow guiding structure forms a plurality of first airflow channels that are continuously bent and inclined downward along the air inlet side to the air outlet side of the fin.

[0008] In some embodiments, the heat exchange flat tube includes a first flat tube portion located on the windward side and a second flat tube portion located on the leeward side;

[0009] The first flat tube portion guides the windward airflow upwards, and the second flat tube portion guides the leeward airflow downwards.

[0010] The first flat tube portion and the second flat tube portion are connected together to form an inverted V-shaped structure.

[0011] In some embodiments, the length of the first flat tube portion is less than the length of the second flat tube portion;

[0012] An included angle between the first flat tube portion and the horizontal direction is greater than an included angle between the second flat tube portion and the horizontal direction.

[0013] In some embodiments, an angle between the air inlet side of the first air flow channel and the horizontal direction is smaller than an angle between the air outlet side and the horizontal direction.

[0014] In some embodiments, the flow area of ​​the first air flow channel on the air inlet side is larger than the flow area on the air outlet side.

[0015] In some embodiments, the first airflow channel continuously bends and tilts downward along the air inlet side to the air outlet side of the fin, and the flow area continuously decreases.

[0016] In some embodiments, the airflow guiding structure is discontinuously arranged, and the first airflow channel is a non-enclosed channel.

[0017] In some embodiments, the airflow guiding structure and / or the fin portion where the airflow guiding structure is provided is formed with one or more openings, and the one or more openings constitute a second airflow channel.

[0018] In some embodiments,

[0019] The airflow guiding structure comprises:

[0020] a plurality of guide vanes, wherein the plurality of guide vanes form the first air flow channel;

[0021] The first air flow channel includes a first air flow channel A and a first air flow channel B, and the first air flow channel A and the first air flow channel B are arranged in sequence from bottom to top along the height direction of the fin;

[0022] The plurality of guide vanes include a first guide vane, a second guide vane, a third guide vane and a fourth guide vane;

[0023] The fin is located at the lower side of the first guide plate and the third guide plate to form the first airflow channel A;

[0024] The first air flow channel B is formed by the fin and the area between the first guide vane and the second guide vane and the area between the third guide vane and the fourth guide vane.

[0025] In some embodiments, the first guide fin and the second guide fin are arranged in parallel and have the same extension direction, and two ends of the first guide fin in the extension direction are located between two ends of the second guide fin in the extension direction;

[0026] The third guide plate is arranged in parallel with the fourth guide plate and has the same extension direction, and two ends of the third guide plate in the extension direction are located between two ends of the fourth guide plate in the extension direction.

[0027] In some embodiments, the first guide vane, the second guide vane, the third guide vane and the fourth guide vane are all formed by folding a portion of the side wall of the fin, and a window structure is formed at the folded portion of the side wall of the fin.

[0028] In some embodiments, connecting pieces are connected between adjacent fins;

[0029] The connecting piece comprises a first connecting piece and a second connecting piece, and the first connecting piece and the second connecting piece are alternately arranged in the height direction of the fin;

[0030] Wherein, the first connecting piece is connected between the tops of the adjacent fins, and the second connecting piece is connected between the bottoms of the adjacent fins;

[0031] The first connecting plate and the second connecting plate are respectively connected to adjacent heat exchange flat tubes.

[0032] In some embodiments, a microchannel heat exchanger is provided, comprising:

[0033] The above-mentioned microchannel heat exchange body;

[0034] A header group, the header group is provided with a refrigerant inlet pipe and a refrigerant outlet pipe, and the header group includes a first header and a second header;

[0035] Wherein, the microchannel heat exchange body is arranged between the first header and the second header, and is communicated with the first header and the second header.

[0036] In some embodiments, an air conditioner is provided, comprising:

[0037] The above-mentioned microchannel heat exchanger is used as an air-cooled evaporator.

[0038] The solution provided by the present invention has the following beneficial effects compared with the prior art:

[0039] A plurality of fins play a role in enhancing heat exchange between adjacent heat exchange flat tubes. An airflow guiding structure is provided on the fin. The airflow guiding structure forms a plurality of first airflow channels that are continuously bent and inclined downward along the air inlet side to the air outlet side of the fin. By designing the plurality of first airflow channels to be continuously bent and inclined downward along the air inlet side to the air outlet side of the fin, when the airflow passes through the fin, the airflow guiding structure guides the airflow, and the first airflow channel disturbs and divides the airflow. The direction of the airflow after disturbance and division by the first airflow channel is rapidly converted. Under the blocking effect of the first airflow channel that continuously turns and tilts downward, the cross-section of the airflow flowing on the fin will shrink, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0041] Figure 1 is a schematic diagram of a microchannel heat exchanger shown in an embodiment of the present invention;

[0042] Figure 2 is a side view of a heat exchange flat tube and a fin shown in an embodiment of the present invention;

[0043] Figure 3 is a side view of a fin shown in an embodiment of the present invention;

[0044] Figure 4 is a side view of a heat exchange flat tube shown in an embodiment of the present invention;

[0045] Figure 5 is a schematic diagram of the structure of fins and guide vanes shown in an embodiment of the present invention;

[0046] Figure 6 is a schematic diagram showing an embodiment of the present invention in which fins are located between adjacent heat exchange flat tubes;

[0047] In the figure: 1-first collecting pipe, 2-second collecting pipe, 3-heat exchange flat tube, 301-first flat tube part, 302-second flat tube part, 303-microchannel, 4-fin, 5-refrigerant inlet pipe, 6-refrigerant outlet pipe, 7-guide vane, 701-first air flow channel A, 702-first air flow channel B, 703-first guide vane, 704-second guide vane, 705-third guide vane, 706-fourth guide vane, 707-window structure, 8-connecting plate, 801-first connecting plate, 802-second connecting plate, 9-baffle.

[0048] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In the description of the present invention, it should be noted that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "contacted", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] When the microchannel heat exchanger is used as an air-cooled evaporator, the refrigerant evaporates and absorbs heat in the flat tubes, resulting in low surface temperatures of the flat tubes and fins. When air flows through the heat exchanger, water vapor in the air condenses. Since the flat tubes of the microchannel heat exchanger are generally placed in parallel and the fins are placed vertically, condensed water accumulates at the roots of the fins on the upper part of the flat tubes, reducing the heat exchange efficiency of the heat exchanger. In addition, frost and ice will occur, further reducing the heat exchange efficiency of the heat exchanger.

[0052] Based on this, the following embodiments are proposed.

[0053] Embodiment 1:

[0054] like Figure 1-3 As shown in , 6, this embodiment provides a microchannel heat exchange body, including:

[0055] A plurality of heat exchange flat tubes 3, wherein the plurality of heat exchange flat tubes 3 are arranged side by side vertically;

[0056] A plurality of fins 4, each fin 4 is vertically connected between adjacent heat exchange flat tubes 3;

[0057] Among them, an airflow guiding structure is provided on the fin 4, and the airflow guiding structure forms a plurality of first airflow channels that are continuously bent and inclined downward along the air inlet side to the air outlet side of the fin 4.

[0058] In this embodiment, multiple fins 4 play a role in enhancing heat exchange between adjacent heat exchange flat tubes 3. The multiple fins 4 can be a split structure or an integrated structure. An airflow guiding structure is provided on the fin 4. The airflow guiding structure forms multiple first airflow channels that are continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4. By designing the multiple first airflow channels to be continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4, when the airflow passes through the fin 4, the airflow guiding structure guides the airflow, and the first airflow channel disturbs and divides the airflow. The direction of the airflow after disturbance and division by the first airflow channel is quickly changed. Under the blocking effect of the first airflow channel that continuously turns downward, the cross-section of the airflow flowing on the fin 4 will shrink, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin 4 in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin 4.

[0059] like Figure 6 As shown, the distribution of two heat exchange flat tubes 3 and the fins 4 therebetween is shown. The spacing between the upper and lower flat tubes 3 is set to 10mm-20mm, the fins 4 are evenly distributed between the two heat exchange flat tubes 3, and the spacing between the fins 4 is set to 1.3mm-1.8mm. Under this spacing setting, the overall heat exchange area and air flow resistance of the heat exchanger are relatively suitable, further achieving a better heat exchange effect.

[0060] Optionally, in an implementation of this embodiment, as Figure 2 , 4 As shown,

[0061] The heat exchange flat tube 3 includes a first flat tube portion 301 located on the windward side and a second flat tube portion 302 located on the leeward side;

[0062] The first flat tube portion 301 guides the windward airflow obliquely upward, and the second flat tube portion 301 guides the leeward airflow obliquely downward.

[0063] The first flat tube portion 301 and the second flat tube portion 301 are connected together to form an inverted V-shaped structure.

[0064] In this embodiment, the airflow channel formed by the first flat tube portions 301 of adjacent heat exchange flat tubes 3 has a tendency to make the airflow flow obliquely upward; the airflow channel formed by the second flat tube portions 302 of adjacent heat exchange flat tubes 3 has a tendency to make the airflow flow obliquely downward.

[0065] The heat exchange flat tube 3 composed of the first flat tube portion 301 and the second flat tube portion 302 is in an asymmetric V-shape as a whole. In the asymmetric V-shaped heat exchange flat tube 3, the first flat tube portion 301 serves as the windward side. When the airflow flows on the heat exchange flat tube 3, it first moves upward at a certain inclination angle. The second flat tube portion 302 serves as the leeward side. When the airflow flows to the second flat tube portion 302, it moves downward at a certain inclination angle. Through the asymmetric V-shaped design, the condensed water on the heat exchange flat tube 3 can naturally flow out of the heat exchange flat tube 3 under the action of gravity. The asymmetric V-shaped heat exchange flat tube 3 has an inflection point. When the fluid flows through the heat exchange flat tube 3, it is easier to form a vortex, thereby increasing the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3. The inflection point of the asymmetric V-shaped heat exchange flat tube 3 has the function of destroying the boundary layer, thereby effectively increasing the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3, and improving the overall heat exchange efficiency of the microchannel heat exchange body.

[0066] Furthermore, the gravity effect brought about by the asymmetric V-shaped design of the heat exchange flat tube 3 combined with the multiple first airflow channels formed by the airflow guide structure cooperates with the airflow disturbance and guiding effect to achieve the purpose of removing condensed water accumulated at the roots of the fins 4 on the heat exchange flat tube 3 and preventing frost and ice.

[0067] During the interaction between the main body of the microchannel heat exchanger and the airflow, the airflow first makes it easier for the condensed water to slide down under the action of gravity due to the inclination angle of the asymmetric V-shaped heat exchange flat tube 3. Secondly, the asymmetric V-shaped heat exchange flat tube 3 induces the airflow to move upward at a certain inclination angle on the windward side and flow downward at a certain inclination angle on the leeward side, and the condensed water accumulated at the root of the fin 4 on the upper part of the heat exchange flat tube 3 is swept by the airflow. In addition, when the airflow passes through the fin 4, the airflow guide structure guides the airflow, and the multiple first airflow channels disturb and divide the airflow. The direction of the airflow after disturbance and division by the first airflow channel is quickly changed. The cross-section of the airflow flowing on the fin 4 will shrink under the blocking effect of the first airflow channel that continuously turns to the downwardly inclined first airflow channel, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin 4 in terms of speed and direction.

[0068] Therefore, through the design of the asymmetric V-shaped heat exchange flat tube 3, condensed water is easy to slide down under the action of gravity and is not easy to gather. When the airflow flows on the asymmetric V-shaped heat exchange flat tube 3, eddy currents are easily formed, which increases the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3. At the same time, the inflection point has the effect of destroying the boundary layer, thereby effectively increasing the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3. In addition, the multiple first airflow channels formed by the airflow guide structure cooperate with the airflow disturbance and guidance, which can further achieve the purpose of removing the condensed water accumulated at the root of the upper fin 4 of the heat exchange flat tube and preventing frost and ice.

[0069] Optionally, in an implementation of this embodiment, as Figure 2 , 4 As shown,

[0070] The length of the first flat tube portion 301 is smaller than the length of the second flat tube portion 302;

[0071] The angle between the first flat tube portion 301 and the horizontal direction is greater than the angle between the second flat tube portion 302 and the horizontal direction.

[0072] In this embodiment, the heat exchange flat tube 3 has a length of 15 to 25 mm and a thickness of 2 to 3 mm. Figure 4 As shown, the angle α2 on the windward side is 20° to 30°, and the angle α1 on the leeward side is 10° to 20°. The airflow enters from the windward side, flows upward first and then flows downward. The length of the second flat tube portion 302 is limited to be greater than the first flat tube portion 301, so that the airflow relatively quickly reaches the inflection point of the asymmetric V-shaped heat exchange flat tube 3, quickly forms a vortex, and quickly increases the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3. At the same time, the inflection point has the effect of destroying the boundary layer, thereby effectively increasing the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube 3.

[0073] In addition, the length of the first flat tube portion 301 and the specific length of the second flat tube portion 302 can be designed according to actual conditions, and the inflection points can be rounded or non-rounded.

[0074] Optionally, in an implementation of this embodiment, as Figure 2 As shown,

[0075] The angle between the air inlet side of the first air flow channel and the horizontal direction is smaller than the angle between the air outlet side and the horizontal direction.

[0076] In the present embodiment, during the process of the airflow flowing on the fin 4, it is first disturbed, divided, and guided once by the air inlet side of the first airflow channel, and then guided for the second time by the air outlet side of the first airflow channel. The airflow after the second guidance can sweep different positions of the heat exchange flat tube 3, thereby improving the heat exchange effect. The first airflow channel as a whole continuously bends and tilts downward from the air inlet side to the air outlet side of the fin 4, so that the air outlet side suppresses the airflow after the first guidance on the air inlet side, that is, the secondary guidance is suppressive relative to the primary guidance, thereby making the airflow direction quickly changed when the airflow passes through the air outlet side, and the cross-section of the airflow flowing on the fin 4 suddenly shrinks, further increasing the flow rate of the airflow, so that the airflow effectively flushes the root position of the fin 4, thereby reducing the possibility of condensation water accumulation, frost and ice formation at the root position of the fin 4.

[0077] Optionally, in an implementation of this embodiment, as Figure 2 As shown,

[0078] The flow area of ​​the first air flow channel on the air inlet side is larger than the flow area of ​​the air outlet side.

[0079] Furthermore, as the first airflow channel continuously bends and tilts downward from the air inlet side to the air outlet side of the fin 4, the flow area continuously decreases.

[0080] By designing the flow area on the air inlet side of the first air flow channel to be larger than the flow area on the air outlet side, the flow area of ​​the first air flow channel is continuously reduced during the process of bending and tilting downward from the air inlet side to the air outlet side of the fin 4. This increases the flow velocity of the air flow in the first air flow channel, and has a better sweeping and flushing effect on the condensed water at the root position of the fin 4, which can further avoid the possibility of condensed water accumulation, frost and ice.

[0081] Optionally, in an implementation of this embodiment, as Figure 2 , 3 As shown,

[0082] The airflow guide structure is discontinuously arranged, and the first airflow channel is a non-enclosed channel.

[0083] In this embodiment, the airflow guiding structure is designed to be discontinuous, and the first airflow channel is a non-closed channel, which can achieve the turbulence effect of the first airflow channel itself to a greater extent. The gap of the non-closed first airflow channel further increases the disturbance, guidance, and segmentation effect of the first airflow channel as a whole on the airflow, so that the airflow is more divergent on the fin 4, the sweeping area is wider, and the heat exchange effect is better.

[0084] Optionally, in an implementation of this embodiment, as Figure 3 , 5 As shown,

[0085] The airflow guiding structure and / or the portion of the fin 4 where the airflow guiding structure is provided is formed with one or more openings, and the one or more openings constitute a second airflow channel.

[0086] In this embodiment, one or more windows constitute the second air flow channel to further increase the effect of the fin 4 on the air flow disturbance, which can not only increase the heat exchange effect, but also enable the air flow to blow the fin 4 more comprehensively, avoiding the possibility of accumulation, frost and ice of condensed water on the fin 4.

[0087] Optionally, in an implementation of this embodiment, as Figure 2 , 3 As shown,

[0088] The airflow guide structure includes:

[0089] A plurality of guide vanes 7, wherein the plurality of guide vanes 7 form a first air flow channel;

[0090] The first airflow channel includes a first airflow channel A701 and a first airflow channel B702, and the first airflow channel A701 and the first airflow channel B702 are arranged in sequence from bottom to top along the height direction of the fin 4;

[0091] The plurality of guide vanes 7 include a first guide vane 703 , a second guide vane 704 , a third guide vane 705 and a fourth guide vane 706 ;

[0092] The fin 4 is located at the lower area of ​​the first guide plate 703 and the third guide plate 705 to form a first air flow channel A701;

[0093] The fin 4 and the area between the first guide vane 703 and the second guide vane 704 and the area between the third guide vane 705 and the fourth guide vane 706 form a first airflow channel B702.

[0094] In this embodiment, a plurality of fins 4 play a role in enhancing heat exchange between adjacent heat exchange flat tubes 3. A plurality of guide vanes 7 are provided on the fins 4. The plurality of guide vanes 7 form a plurality of first airflow channels. The first airflow channel A701 and the first airflow channel B702 are arranged in sequence from bottom to top along the height direction of the fins 4. By designing that the angle between the air inlet side of the first airflow channel A701 and the first airflow channel B702 and the horizontal direction is smaller than the angle between the air outlet side and the horizontal direction, when the airflow passes through the fins 4, it first passes through the air inlet side of the first airflow channel A701 and the first airflow channel B702, disturbs and divides the airflow, and the airflow after disturbance and division is continuously turned to the downward inclined Under the blocking effect of the first air flow channel A701 and the first air flow channel B702, the cross-section of the air flow flowing on the fin 4 will shrink, further increasing the flow rate of the air flow, so that the air flow can effectively flush and purge the root position of the fin 4 in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin 4. Furthermore, the first air flow channel B702 located on the upper side has a further guiding and suppressing effect on the air flow passing through the first air flow channel A701 on the lower side, so that the air flow after secondary guidance and suppression can purge different positions of the heat exchange flat tube 3, which not only effectively prevents the accumulation of condensed water, but also improves the heat exchange effect.

[0095] Multiple first airflow channels are formed by multiple guide vanes, which have a simple structure and are easy to form. When the airflow flows on the fin 4, the first airflow channel A701 is first formed by the fin 4 and the lower area of ​​the first guide vane 703 and the third guide vane 705. The first airflow channel B702 is formed by the fin 4 and the area between the first guide vane 703 and the second guide vane 704 and the area between the third guide vane 705 and the fourth guide vane 706. The airflow is disturbed, divided, and guided at the same time. The first airflow channel B702 located on the upper side has a further guiding and suppressing effect on the airflow passing through the first airflow channel A701 on the lower side, so that the airflow that has been guided and suppressed for the second time can purge different positions of the heat exchange flat tube 3, which not only effectively prevents the accumulation of condensed water, but also improves the heat exchange effect.

[0096] The shapes, sizes and angles of the first guide plate 703 , the second guide plate 704 , the third guide plate 705 and the fourth guide plate 706 can be changed according to actual usage.

[0097] By reasonably setting the position and angle of each guide vane on the fin 4, the first airflow channel B702 on the upper side has a further guiding and suppressing effect on the airflow passing through the first airflow channel A701 on the lower side, so that the airflow after secondary guidance and suppression can purge different positions of the heat exchange flat tube 3, which not only effectively prevents the accumulation of condensed water, but also improves the heat exchange effect.

[0098] Optionally, in an implementation of this embodiment, as Figure 2 , 3 As shown,

[0099] The first guide fin 703 and the second guide fin 704 are arranged in parallel and extend in the same direction, and two ends of the first guide fin 703 in the extending direction are located between two ends of the second guide fin 704 in the extending direction;

[0100] The third guide plate 705 and the fourth guide plate 706 are arranged in parallel and extend in the same direction. Two ends of the third guide plate 705 in the extending direction are located between two ends of the fourth guide plate 706 in the extending direction.

[0101] In this embodiment, the second guide vane 704 is designed to cover the first guide vane 703, and the fourth guide vane 706 is designed to cover the third guide vane 705. This design enables the first airflow channel B702 to have a more obvious suppressive guiding effect on the airflow guided by the first airflow channel A701, thereby further increasing the flow surface and flow rate of the airflow, so that the airflow can effectively flush the large-area root position of the fin 4, thereby reducing the possibility of condensation water accumulation, frost and ice formation at the root position of the fin 4.

[0102] Optionally, in an implementation of this embodiment, as Figure 5 As shown,

[0103] The first guide vane 703 , the second guide vane 704 , the third guide vane 705 and the fourth guide vane 706 are all formed by folding a portion of the side wall of the fin 4 , and a window structure 707 is formed at the folded portion of the side wall of the fin 4 .

[0104] In the present embodiment, a window structure 707 is provided on the fin 4, and four guide vanes are formed by folding the fin at the window structure 707. While the forming is convenient, the setting of the window structure 707 further increases the effect of the fin 4 on the airflow disturbance, which can not only increase the heat exchange effect, but also enable the airflow to blow the fin 4 more comprehensively, thereby avoiding the possibility of accumulation, frost and ice of condensed water on the fin 4.

[0105] Optionally, in an implementation of this embodiment, as Figure 5 , 6 As shown,

[0106] Connecting pieces 8 are connected between adjacent fins 4;

[0107] The connecting piece 8 includes a first connecting piece 801 and a second connecting piece 802, and the first connecting piece 801 and the second connecting piece 802 are alternately arranged in the height direction of the fin 4;

[0108] The first connecting piece 801 is connected between the tops of adjacent fins 4, and the second connecting piece 802 is connected between the bottoms of adjacent fins 4;

[0109] The first connecting plate 801 and the second connecting plate 802 are respectively connected to adjacent heat exchange flat tubes 3 .

[0110] In this embodiment, the connection sheet 8 is provided to facilitate the connection between the multiple fins 4, so that the multiple fins 4 form a whole, which is convenient for the whole to be connected to the heat exchange flat tube 3. The connection sheet 8 includes a first connection sheet 801 and a second connection sheet 802. The first connection sheet 801 and the second connection sheet 802 are staggered in the height direction of the fin 4 by design; the first connection sheet 801 is connected between the tops of adjacent fins 4, and the second connection sheet 802 is connected between the bottoms of adjacent fins 4; the first connection sheet 801 and the second connection sheet 802 are respectively connected to the adjacent heat exchange flat tube 3. In this way, the multiple fins 4 are firmly connected between the two heat exchange flat tubes 3 in an integrally connected manner. On this basis, the staggered arrangement between the first connection sheet 801 and the second connection sheet 802 makes the connection sheet material relatively less.

[0111] Preferably, the top of the fin 4 has a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the corresponding heat exchange flat tube 3;

[0112] The bottom of the fin 4 has a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the corresponding heat exchange flat tube 3 .

[0113] In this embodiment, the top of the fin 4 is designed to have a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the corresponding heat exchange flat tube 3; the bottom of the fin 4 is designed to have a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the corresponding heat exchange flat tube 3, so that the connection length between the fin 4 and the heat exchange flat tube 3 is relatively longer, and the connection is more convenient and firm. Specifically, the top of the fin 4, the first connecting piece 801, can be designed to have a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the heat exchange flat tube 3, and the bottom of the fin 4, the second connecting piece 802, can be designed to have a shape that matches the inclination trend of the first flat tube portion 301 and the second flat tube portion 302 in the heat exchange flat tube 3.

[0114] Embodiment 2

[0115] like Figure 1 As shown, this embodiment provides a microchannel heat exchanger, comprising:

[0116] The microchannel heat exchange body in the first embodiment;

[0117] A header group, on which a refrigerant inlet pipe 5 and a refrigerant outlet pipe 6 are arranged, and the header group includes a first header 1 and a second header 2;

[0118] The microchannel heat exchange body is disposed between the first header 1 and the second header 2 , and is communicated with the first header 1 and the second header 2 .

[0119] In this embodiment, the refrigerant inlet pipe 5 is connected to the upper end of the first header 1, and the refrigerant outlet pipe 6 is connected to the lower end of the first header 1. The first header 1 is provided with a baffle 9 for separation at the upper side of the refrigerant outlet pipe 6. The refrigerant enters the first header 1 from the refrigerant inlet pipe 5, and the part on the baffle 9 evenly flows to the multiple heat exchange flat tubes for heat exchange, and is collected to the second header 2. From the lower position of the second header 2, it flows back to the lower part of the first header 1, and finally discharged from the refrigerant outlet pipe 6, completing a heat exchange cycle.

[0120] During the heat exchange cycle, multiple fins 4 play a role in enhancing heat exchange between adjacent heat exchange flat tubes 3. An airflow guiding structure is provided on the fin 4. The airflow guiding structure forms multiple first airflow channels that are continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4. By designing multiple first airflow channels to be continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4, when the airflow passes through the fin 4, the airflow guiding structure guides the airflow, and the first airflow channel disturbs and divides the airflow. The direction of the airflow after disturbance and division by the first airflow channel is quickly converted. Under the blocking effect of the first airflow channel that continuously turns downward, the cross-section of the airflow flowing on the fin 4 will shrink, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin 4 in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin 4.

[0121] Preferably, a plurality of microchannels 303 for circulating the refrigerant are formed in the heat exchange flat tubes 3. The plurality of microchannels 303 can make the refrigerant circulate more evenly in the heat exchange flat tubes 3, thereby increasing the overall heat exchange effect of the microchannel heat exchanger.

[0122] Embodiment 3

[0123] This embodiment provides an air conditioner, including:

[0124] The microchannel heat exchanger in the second embodiment is used as an air-cooled evaporator.

[0125] In the present embodiment, in the microchannel heat exchanger in the air conditioner, a plurality of fins 4 play a role in enhancing heat exchange between adjacent heat exchange flat tubes 3. An airflow guiding structure is provided on the fin 4. The airflow guiding structure forms a plurality of first airflow channels that are continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4. By designing the plurality of first airflow channels to be continuously bent and tilted downward along the air inlet side to the air outlet side of the fin 4, when the airflow passes through the fin 4, the airflow guiding structure guides the airflow, and the first airflow channel disturbs and divides the airflow. The direction of the airflow after disturbance and division by the first airflow channel is rapidly converted. Under the blocking effect of the first airflow channel that is continuously bent and tilted downward, the cross-section of the airflow flowing on the fin 4 will shrink, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin 4 in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin 4.

[0126] In summary, the ingenious concept of the microchannel heat exchanger is:

[0127] First, multiple fins play a role in enhancing heat exchange between adjacent heat exchange flat tubes. An airflow guiding structure is provided on the fin. The airflow guiding structure forms multiple first airflow channels that are continuously bent and tilted downward along the air inlet side to the air outlet side of the fin. By designing multiple first airflow channels to be continuously bent and tilted downward along the air inlet side to the air outlet side of the fin, when the airflow passes through the fin, the airflow guiding structure guides the airflow, and the first airflow channel disturbs and divides the airflow. The direction of the airflow after disturbance and division by the first airflow channel is quickly converted. Under the blocking effect of the first airflow channel that continuously turns and tilts downward, the cross-section of the airflow flowing on the fin will shrink, further increasing the flow rate of the airflow, so that the airflow can effectively flush and sweep the root position of the fin in terms of speed and direction, thereby reducing the possibility of accumulation, frost and ice of condensed water at the root position of the fin.

[0128] Second, the heat exchange flat tube composed of the first flat tube portion and the second flat tube portion is designed to be an asymmetric V-shape as a whole. In the asymmetric V-shaped heat exchange flat tube, the first flat tube portion serves as the windward side. When the airflow flows on the heat exchange flat tube, it first moves upward at a certain inclination angle. The second flat tube portion serves as the leeward side. When the airflow flows to the second flat tube portion, it moves downward at a certain inclination angle. Through the asymmetric V-shaped design, condensed water on the heat exchange flat tube can naturally flow out of the heat exchange flat tube under the action of gravity. The asymmetric V-shaped heat exchange flat tube has an inflection point. When the fluid flows through the heat exchange flat tube, it is easier to form a vortex, which increases the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube. The inflection point of the asymmetric V-shaped heat exchange flat tube has the function of destroying the boundary layer, thereby effectively increasing the contact area and heat exchange efficiency between the fluid and the wall of the heat exchange flat tube, and improving the overall heat exchange efficiency of the microchannel heat exchange body. The gravity effect brought by the asymmetric V-shaped design of the heat exchange flat tubes combined with the multiple first airflow channels formed by the multiple guide vanes on the fins work together to disturb and guide the airflow, so as to achieve the purpose of removing condensed water accumulated at the roots of the fins on the heat exchange flat tubes and preventing frost and ice.

[0129] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0130] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0131] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0132] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0133] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A microchannel heat exchange body, characterized in that: include: A plurality of heat exchange flat tubes (3), wherein the plurality of heat exchange flat tubes (3) are arranged side by side in an upper and lower direction; A plurality of fins (4), each of the fins (4) being vertically connected between adjacent heat exchange flat tubes (3); Wherein, the fin (4) is provided with an airflow guiding structure, and the airflow guiding structure forms a plurality of first airflow channels that are continuously bent and inclined downward along the air inlet side to the air outlet side of the fin (4).

2. The microchannel heat exchange body according to claim 1, characterized in that: The heat exchange flat tube (3) comprises a first flat tube portion (301) located on the windward side and a second flat tube portion (302) located on the leeward side; The first flat tube portion (301) guides the windward side airflow obliquely upward, and the second flat tube portion (301) guides the leeward side airflow obliquely downward; The first flat tube portion (301) and the second flat tube portion (301) are connected together to form an inverted V-shaped structure.

3. The microchannel heat exchange body according to claim 2, characterized in that: The length of the first flat tube portion (301) is smaller than the length of the second flat tube portion (302); The angle between the first flat tube portion (301) and the horizontal direction is greater than the angle between the second flat tube portion (302) and the horizontal direction.

4. The microchannel heat exchange body according to any one of claims 1 to 3, characterized in that: The angle between the air inlet side of the first air flow channel and the horizontal direction is smaller than the angle between the air outlet side and the horizontal direction.

5. The microchannel heat exchange body according to claim 4, characterized in that: The flow area of ​​the first air flow channel on the air inlet side is larger than the flow area of ​​the air outlet side.

6. The microchannel heat exchange body according to claim 5, characterized in that: The first airflow channel is continuously bent and tilted downward along the air inlet side to the air outlet side of the fin (4), and the flow area is continuously reduced.

7. The microchannel heat exchange body according to claim 6, characterized in that: The airflow guide structure is discontinuously arranged, and the first airflow channel is a non-closed channel.

8. The microchannel heat exchange body according to claim 4, characterized in that: The airflow guiding structure and / or the fin (4) where the airflow guiding structure is arranged are formed with one or more openings, and the one or more openings constitute a second airflow channel.

9. The microchannel heat exchange body according to claim 4, characterized in that: The airflow guiding structure comprises: A plurality of guide vanes (7), wherein the plurality of guide vanes (7) form the first air flow channel; The first airflow channel comprises a first airflow channel A (701) and a first airflow channel B (702), wherein the first airflow channel A (701) and the first airflow channel B (702) are arranged in sequence from bottom to top along the height direction of the fin (4); The plurality of guide vanes (7) include a first guide vane (703), a second guide vane (704), a third guide vane (705) and a fourth guide vane (706); The fin (4) is located at the lower area of ​​the first guide plate (703) and the third guide plate (705) to form the first airflow channel A (701); The fin (4) and the area between the first guide plate (703) and the second guide plate (704) and the area between the third guide plate (705) and the fourth guide plate (706) form the first airflow channel B (702).

10. The microchannel heat exchange body according to claim 9, characterized in that: The first guide fin (703) and the second guide fin (704) are arranged in parallel and have the same extension direction, and two ends of the first guide fin (703) in the extension direction are located between two ends of the second guide fin (704) in the extension direction; The third guide plate (705) and the fourth guide plate (706) are arranged in parallel and have the same extension direction, and the two ends of the third guide plate (705) in the extension direction are located between the two ends of the fourth guide plate (706) in the extension direction.

11. The microchannel heat exchange body according to claim 9, characterized in that: The first guide plate (703), the second guide plate (704), the third guide plate (705) and the fourth guide plate (706) are all formed by folding part of the side wall of the fin (4), and a window structure (707) is formed at the folded part of the side wall of the fin (4).

12. The microchannel heat exchange body according to claim 1, characterized in that: A connecting piece (8) is connected between adjacent fins (4); The connecting piece (8) comprises a first connecting piece (801) and a second connecting piece (802), wherein the first connecting piece (801) and the second connecting piece (802) are arranged alternately in a height direction of the fin (4); Wherein, the first connecting piece (801) is connected between the tops of adjacent fins (4), and the second connecting piece (802) is connected between the bottoms of adjacent fins (4); The first connecting plate (801) and the second connecting plate (802) are respectively connected to adjacent heat exchange flat tubes (3).

13. A microchannel heat exchanger, characterized in that: include: The microchannel heat exchange body according to any one of claims 1 to 12; A header group, the header group being provided with a refrigerant inlet pipe (5) and a refrigerant outlet pipe (6), the header group comprising a first header (1) and the second header (2); Wherein, the microchannel heat exchange body is arranged between the first header (1) and the second header (2), and is in communication with the first header (1) and the second header (2).

14. An air conditioner, characterized in that: include: The microchannel heat exchanger according to claim 13, wherein the microchannel heat exchanger is used as an air-cooled evaporator.

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