A current collection structure, a microchannel heat exchanger and an air conditioner

Abstract

The present invention discloses a current collecting structure, a microchannel heat exchanger and an air conditioner. The current collecting structure includes a substrate, and a plurality of channels are provided on one side surface of the substrate for plugging and positioning with heat exchange fins; a fluid channel is provided in the substrate, and the fluid channel is communicated with the plurality of channels and is configured to collect the fluid in the plurality of channels and lead it out of the current collecting structure or divide the fluid flowing into the current collecting structure and introduce it into the plurality of channels. The microchannel heat exchanger includes a plurality of heat exchange fins, and further includes two of the above-mentioned current collecting structures. The two current collecting structures are respectively arranged at both ends of the heat exchange fins, and the end portions of the heat exchange fins are inserted into the channels to communicate the channels with the pipelines in the heat exchange fins. The air conditioner includes the microchannel heat exchanger. The technical solution provided by the present invention aims to solve the technical problem that the densely arranged channels in the prior art are prone to damage the current collecting structure.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment, and particularly to a current collecting structure, a microchannel heat exchanger and an air conditioner. Background Art

[0002] Air conditioner heat exchangers have experienced traditional finned tube heat exchangers and new microchannel heat exchangers. With the increasing demand for high energy efficiency and environmentally friendly air conditioners, the development of the next generation of air conditioner heat exchangers towards ultra-fine tube diameters is an important direction. Currently, mass-produced microchannel heat exchangers all have multiple flat flat tubes (heat exchange fins) with multiple fine flow channels inside, and current collecting tubes for current collection and diversion are provided at both ends of the flat tubes. The current collecting tube is usually a large round tube with grooves opened on the tube side for inserting the flat tubes (heat exchange fins). The end of the flat tube is directly inserted into the current collecting tube. When the distance between the flat tubes is significantly reduced, dense grooves need to be opened on the current collecting tube. Since the tube wall itself is relatively thin, the processing difficulty increases and the current collecting tube is easily damaged. Summary of the Invention

[0003] The main object of the present invention is to provide a current collecting structure and a microchannel heat exchanger, aiming to solve the technical problem that the existing densely arranged grooves are likely to cause damage to the current collecting structure.

[0004] To achieve the above object, the current collecting structure proposed by the present invention includes a substrate. A plurality of grooves are provided on one side surface of the substrate for plugging and positioning with the heat exchange fins. A fluid channel is provided inside the substrate, and the fluid channel is communicated with the plurality of grooves and is configured to collect the fluid in the plurality of grooves and lead out the current collecting structure or divert the fluid flowing into the current collecting structure into the plurality of grooves.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows.

[0006] Preferably, the groove is set as a stepped groove extending in a first direction. The groove includes a first groove formed by inward depression from the surface of the substrate, and a second groove provided at the bottom of the first groove. The bottom of the first groove is configured to limit the heat exchange fin.

[0007] The beneficial effect of adopting the above further solution is that while limiting the heat exchange fin, the fluid passability of the groove in its length direction is ensured.

[0008] Preferably, the plurality of grooves are arranged in parallel and are spaced apart along a second direction. Both ends of each groove in the first direction are flush, forming a groove array.

[0009] Preferably, the groove includes alternately arranged circular groove segments and straight groove segments in the first direction. The circular groove segment is set as a circular groove corresponding to the tubular part of the heat exchange fin, and the straight groove segment is set as a linear groove corresponding to the plate-shaped part of the heat exchange fin.

[0010] Preferably, the fluid channel includes a first channel and a second channel. The first channel and the second channel extend along the second direction and are respectively located at two ends of the channel in the first direction. Both the first channel and the second channel communicate with the second groove.

[0011] Preferably, the fluid channel includes a third channel that communicates the first channel and the second channel.

[0012] Preferably, the substrate is provided as a single piece; or the substrate includes a cover plate and a bottom plate that are detachably connected. The cover plate covers the bottom plate, and the channel is provided on the cover plate.

[0013] The beneficial effect of adopting the above further solution is to ensure the overall strength of the current collection structure.

[0014] The present invention also provides a microchannel heat exchanger, which includes a plurality of heat exchange fins, and also includes two of the above current collection structures. The two current collection structures are respectively arranged at two ends of the heat exchange fins. The ends of the heat exchange fins are inserted into the channels, and the channels communicate with the pipes inside the heat exchange fins.

[0015] Preferably, the heat exchange fins are welded, clamped, or connected by fasteners to the substrate

[0016] The beneficial effect of adopting the above further solution is that the channels and the heat exchange fins can be further fixed to ensure stability, and various connection forms can be realized, not limited to welding.

[0017] The present invention also provides an air conditioner, which includes the above microchannel heat exchanger.

[0018] In the technical solution of the present invention, aiming at the problem that the current collection structure is vulnerable due to the dense installation of heat exchange fins, the current collection structure relies on the support of the substrate material itself to achieve stable mechanical properties between the channels, ensuring the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 Schematic diagram of the installation of the current collection structure and the heat exchange fins according to an embodiment of the present invention;

[0021] Figure 2 For Figure 1Schematic diagram of the current collection structure therein;

[0022] Figure 3 is Figure 2 Partial enlarged schematic diagram at position A in;

[0023] Figure 4 Schematic diagram of the microchannel heat exchanger according to an embodiment of the present invention;

[0024] Figure 5 is Figure 4 Partial enlarged schematic diagram at position B in;

[0025] Figure 6 is Figure 4 Schematic diagram of the first current collection structure in;

[0026] Figure 7 is Figure 6 Schematic diagram of the C-C cross-section in;

[0027] Figure 8 is Figure 7 Partial enlarged schematic diagram at position D in;

[0028] Figure 9 is Figure 4 Schematic diagram of the second current collection structure in;

[0029] Figure 10 is Figure 9 Schematic diagram of the E-E cross-section in;

[0030] Figure 11 is Figure 10 Partial enlarged schematic diagram at position F in.

[0031] Explanation of the reference numerals in the drawings:

[0032] 1 - heat exchange fin, 2 - current collection structure, 3 - substrate, 4 - channel, 5 - plate-shaped part, 6 - tubular part, 7 - microchannel, 8 - first end face, 9 - straight groove section, 10 - circular groove section, 11 - second groove, 12 - first groove, 13 - second current collection structure, 14 - first current collection structure, 15 - first pore, 16 - second pore, 17 - first shunt hole, 18 - second shunt hole, 19 - inlet / outlet pore, 20 - folded pore, 21 - first end, 22 - fourth end, 23 - second end, 24 - third end, 25 - connection hole, 26 - fifth pore, 27 - sixth pore, 28 - first connection port, 29 - second connection port.

[0033] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figures 1 to 11 , the manifold structure and the microchannel heat exchanger according to an embodiment of the present invention. The manifold structure 2 can be used for the collection or distribution of the heat exchange fins 1. As Figures 1 to 5 shown, the manifold structure 2 includes a plate-shaped substrate 3. A plurality of recessed channels 4 are provided on one side surface of the substrate 3, and the channels 4 are used for plugging and positioning with the heat exchange fins 1. Moreover, a fluid channel is provided in the substrate 3, and the fluid channel can collect the fluids in each channel 4 and lead them out of the manifold structure 2, or distribute the fluid flowing into the manifold structure 2 into each channel 4. Thus, the manifold structure 2 is plate-shaped and provided with channels 4, and has good overall strength. A plurality of heat exchange fins 1 can be densely plugged. Compared with the currently mass-produced manifold tubes, there is an obvious improvement in strength, avoiding the problem that the densely arranged channels are prone to damage the manifold structure, and ensuring the strength of the heat exchanger.

[0036] First, as Figures 1 to 3 shown, any one of the channels 4 is set as a linear groove extending in the first direction, and a plurality of channels 4 are parallel and equally spaced in the second direction, so that the channels 4 can be densely arranged. The above-mentioned first direction and second direction are perpendicular linear directions, but are not limited thereto. For example, the first direction and the second direction can also be curved directions. Moreover, the lengths of each channel 4 are equal, so that both ends of the length directions of all the channels 4 are flush, forming a neat channel array.

[0037] Secondly, for the flat heat exchange fin 1, the heat exchange fin 1 has alternately arranged tubular parts 6 and plate-like parts 5. Among them, the tubular part 6 is circular tubular, and the plate-like part 5 is flat plate-shaped. The pipeline (micro-pipeline 7) in the tubular part 6 allows fluid to pass through, and there is no pipeline in the plate-like part 5. In order to match the channel 4 with the heat exchange fin 1, the channel 4 includes alternately arranged circular groove sections 10 and straight groove sections 9 in its length direction (the first direction). The circular groove section 10 adopts a circular groove and its size corresponds to the tubular part 6 of the heat exchange fin 1 for corresponding insertion. The straight groove section 9 adopts a straight-line groove, and its size corresponds to the plate-like part 5 of the heat exchange fin 1. Thus, the heat exchange fin 1 can be accurately positioned and inserted into the channel 4, and the maximum gap between the heat exchange fin 1 and the channel 4 after insertion is less than 0.1. Among them, the outer diameter of the tubular part 6 is D, and its value can be between 0.3 - 1.2 mm. The wall thickness of the tubular part 6 is between 0.1 - 0.4 mm, and the corresponding circular groove section 10 matches its size; the thickness of the plate-like part 5 is H, and the value of H is between 0.1 - 0.6 mm, and the groove width size of the straight groove section 9 also matches H. In addition, the distance between two adjacent heat exchange fins 1 (i.e., the distance between two channels 4) L1 is between 1.0 - 2.2 mm, and it is not necessary to require that all the spacings are equal, and product differentiation design can be adapted to specific requirements; the width of the heat exchange fin 1 (i.e., the length of the channel 4 in the first direction) L2 can be 8 - 35 mm.

[0038] In addition, the channel 4 adopts a stepped groove, that is, both the circular groove section 10 and the straight groove section 9 are stepped grooves. It includes a first groove 12 formed by inward depression from the surface of the substrate 3 in the depth direction of the channel 4, and a second groove 11 at the bottom of the first groove 12. The groove width of the second groove 11 is smaller than that of the first groove 12, and the size of the first groove 12 matches the size of the heat exchange fin 1 to form a stepped groove shape. When the above heat exchange fin 1 is inserted into the channel 4, the groove width of the second groove 11 is smaller, and the heat exchange fin 1 is only inserted into the first groove 12, and the end abuts against the bottom of the first groove 12. The bottom of the first groove 12 limits the heat exchange fin 1, and the second groove 11 allows fluid to flow along the first direction. Thus, while limiting the heat exchange fin 1, the fluid passability of the channel 4 in its length direction is also ensured. The groove depth of the channel 4 is one-third of the substrate thickness, but it is not limited to this. For example, the groove depth can also be one-half, one-fourth, etc. of the thickness of the substrate 3, as long as it is not greater than one-half of the thickness of the substrate 3, which is beneficial to ensuring the overall strength of the current collecting structure.

[0039] In some exemplary embodiments, the substrate 3 is an integral part and can be processed and formed by means such as printing and injection molding. It can also be a detachable structure, that is, the substrate 3 includes a cover plate and a bottom plate that can be detachably connected. The cover plate can be covered on the bottom plate and connected by fasteners, etc. And the above channel 4 is arranged on the cover plate, and a part of the fluid channel is on the cover plate and a part is on the bottom plate, thereby reducing the processing difficulty of the substrate 3.

[0040] As Figure 4 shown, by connecting both ends of each heat exchange fin 1 to the above-mentioned current collector structure 2, a microchannel heat exchanger can be formed. The end of the heat exchange fin 1 is inserted into the channel 4 on the substrate 3, and the second groove 11 of the channel 4 is communicated with the pipeline (micro-pipeline 7) in the heat exchange fin 1, completing the construction of the fluid pipeline of the microchannel heat exchanger. It can enable the fluid to enter the microchannel heat exchanger from one current collector structure 2, and then be diverted to each heat exchange fin 1, and the fluid flowing through the heat exchange fin 1 can converge and flow out in another current collector structure. In addition, in addition to inserting into the channel 4, the heat exchange fin 1 also needs to be further fixed to the substrate 3. Welding can be used to fasten the two, but it is not limited to this. For example, clamping or connecting the two through fasteners. The plate-shaped substrate 3 provides more connection methods compared with the existing current collector tube, and will no longer be limited to welding only.

[0041] The two current collector structures 2 at both ends of the heat exchange fin can adopt two current collector structures with the same fluid channels, or two current collector structures with different fluid channels. Another example is Figure 4 shown. Due to different installation positions, the two current collector structures 2 can be divided into a second current collector structure 13 and a first current collector structure 14. The second current collector structure 13 and the first current collector structure 14 have different fluid channels. The first current collector structure 14 can be used for diversion under the evaporation condition, and the second current collector structure 13 can be used for collection under the evaporation condition. For the diversion process, currently, the existing current collector tube channels directly supply the fluid to each heat exchange fin 1 without diversion, and the distribution of the two-phase refrigerant in the current collector tube is prone to be uneven, resulting in performance degradation problems. For the collection process, the inlet of the existing current collector tube channel is the two-phase refrigerant with a low flow rate, and the outlet is the gaseous refrigerant with a high flow rate, resulting in a gradually increasing pressure difference along the outlet, so the flow rate through the heat exchange fin 1 also gradually increases, causing uneven diversion and performance degradation of the heat exchanger.

[0042] The two current collector structures 2 with different positions have the same characteristics regarding the substrate 3 and the channel 4, and the difference lies in the different fluid channels. In some exemplary embodiments, as Figures 6 to 8 shown, this current collector structure can be used for diversion, that is, dividing the fluid into multiple branches and entering the heat exchange fin 1. This current collector structure is composed of the substrate 3, and the plate surface of the substrate 3 has the above-mentioned channel 4, and a plurality of neatly arranged channels 4 form an array. The fluid channel of this current collector structure can disperse the coolant into each channel 4. This fluid channel is mainly composed of a third channel and a second channel 16, and a first channel 15. Specifically, the first channel 15 is located on one side of the channel array, and the second channel 16 is located on the other side of the channel array, that is, the first channel 15 and the second channel 16 are at both ends in the first direction of the channel 4, so that both ends of the channel 4 are close to the first channel 15 and the second channel 16 respectively, and the second groove 11 of the channel 4 is communicated with both of them. Since the above-mentioned channels 4 are all of the same length and flush, the first channel 15 and the second channel 16 both extend along the second direction.

[0043] As shown Figure 7 in the figure, the two ends of the first channel 15 are respectively the first end 21 and the third end 24, and the first end 21 is far from the first end face 8; the two ends of the second channel 16 in the second direction are respectively the second end 23 and the fourth end 22. The second end 23 is close to the third end 24 and is relatively far from the first end 21. The first end 21 and the second end 23 respectively correspond to two diagonals of the substrate 3. The two ends in the length direction of the second groove 11 of the above-mentioned channel 4 are respectively communicated with the first channel 15 and the second channel 16 through the connecting holes 25. The width of the connecting hole 25 (i.e., the dimension in the second direction) is f, and the value of f is between 0.8 and 1 times the groove width of the second groove 11. The connecting holes 25 connecting the first channel 15 and the connecting holes 25 connecting the second channel 16 not only have the same number, but also have the same stroke length and hydraulic diameter, that is, the sum of the hydraulic diameters of all the connecting holes 25 communicating with the first channel 15 is equal to the sum of the hydraulic diameters of all the connecting holes 25 communicating with the second channel 16, expressed as D5 = D6. The hydraulic diameters of the above-mentioned first channel 15 and the second channel 16 are both set to be 0.8 - 1 times of D5. If the hydraulic diameters of the first channel 15 and the second channel 16 are different, D5 and D6 are also different. As long as the hydraulic diameter of the first channel 15 is 0.8 - 1 times of D5 and the hydraulic diameter of the second channel 16 is 0.8 - 1 times of D6, it is okay.

[0044] One end of the above-mentioned third channel is on the side wall of the substrate 3 as a fluid inlet and outlet. The other end of the third channel forms a two-way branch that is connected to both the first end 21 and the second end 23 to communicate with the first channel 15 and the second channel 16. The flow collecting structure with this fluid channel constitutes the above-mentioned first flow collecting structure 14. Specifically, one side wall of the substrate 3 is the first end face 8, and the first end face 8 is perpendicular to the second direction and close to the second end 23.

[0045] The third channel can be further divided into a first shunt hole 17, a second shunt hole 18, and an access hole 19 according to its trend. Among them, all three are straight holes. One end of the access hole 19 is located on the first end face 8, and fluid can enter the third flow channel through the access hole 19 to realize fluid injection. One end of the first shunt hole 17 is connected to the end of the access hole 19, and this end is also connected to one end of the second shunt hole 18. The above-mentioned first shunt hole 17 and the second shunt hole 18 both extend along the first direction, and the access hole 19 is perpendicular to the first direction. The three form a "T"-shaped pipeline. At the same time, the other end of the first shunt hole 17 is connected to the first end 21 through a folded channel 20, and the other end of the second shunt hole 19 is connected to the second end 23.

[0046] As Figure 7As shown, the folded channel 20 is composed of connected straight channel segments and a bent portion. The straight channel segment is parallel to the first channel 15, that is, it extends along the second direction. The bent portion is located at one end of the straight channel segment away from the first diversion hole 17, and the bent portion extends along the first direction, forming a bend towards the first end 21 and connecting to the first channel 15. This makes the overall shape of the folded channel 20 L-shaped, and the folded channel 20 and the straight first channel 15 enclose a U-shaped flow channel. In addition, for the convenience of processing, the central axes of the third channel, the first channel 15, and the second channel 16 are all in the same plane, and the folded channel 20 is on the side of the first channel 15 facing away from the channel 4.

[0047] Thus, the fluid channel constitutes two shunts for the fluid to flow to the heat exchange fins 1. One is the first fluid channel, and the other is the second fluid channel. The first fluid channel is composed of the first diversion hole 17, the folded channel 20, and the first channel 15. The second fluid channel is composed of the second channel 16 and the second diversion hole 18. The tail end of the first fluid channel is the third end 23, and the tail end of the second fluid channel is the fourth end 22, further achieving shunting. When the fluid enters through the inlet channel 19, it can be shunted. Some fluid flows through the first fluid channel, and another part of the fluid flows through the second fluid channel. The fluid in the first fluid channel will first reach the first end 21 through the folded channel 20 and finally reach the third end 24, forming an injection from the left side to the right side in the second direction into the corresponding heat exchange fin 1. The fluid in the second fluid channel will first reach the second end 23 on the right side and finally reach the fourth end 22 on the left side, forming an injection from the right side to the left side in the second direction into the corresponding heat exchange fin 1. For a single heat exchange fin 1, such as the rightmost heat exchange fin 1 in the second direction, since one end is close to the second end 23, this end first contacts the fluid (refrigerant), and the other end is close to the third end 24 and is in the downstream position of the first fluid channel, so it contacts the fluid relatively later. The leftmost heat exchange fin 1 in the second direction is exactly the opposite. Thus, the current collecting structure uses two branches to supply fluid to the heat exchange fins in two opposite directions to achieve shunting. Through the pressure balance relationship at both ends of the heat exchange fin, the uniformity of refrigerant distribution can be effectively improved.

[0048] In addition, the hydraulic diameter of the above-mentioned folded channel 20 is the same as that of the second channel 16, and the first channel 15 also adopts the same hydraulic diameter, both being D4. The value of D4 is between 0.8 and 1 times that of D5, and can also be expressed as 0.8 to 1 times that of D6. This is convenient for processing and manufacturing, saving manufacturing costs, but is not limited thereto. It can also be designed that the first channel 15 and the folded channel 20 adopt the same hydraulic diameter, but different from the second channel 16, and the hydraulic diameter of the second channel 16 is smaller than the hydraulic diameters of the two, and this design can compensate for the pressure loss with a longer stroke. The first diversion hole 17 and the second diversion hole 18 adopt the same hydraulic diameter, and their values are both D1. The stroke length (i.e., the length along the first direction) of the first diversion hole 17 is L3, and the stroke length (i.e., the length along the first direction) of the second diversion hole 18 is L4. At both ends of the above-mentioned folded channel 20 in the second direction, and at both ends of the second channel 16 in the second direction. Therefore, the stroke lengths of the two in the second direction are the same, both being L5. Among them, the above-mentioned flow channels need to ensure that the following relationship is satisfied, that is wherein C2 is a proportionality coefficient related to the resistance coefficient.

[0049] In some exemplary embodiments, such as Figures 9 to 11As shown in the figure, the current collector structure is composed of the above-mentioned substrate 3, and the side surface of the substrate 3 has neatly arranged channels 4. The fluid channels of the current collector structure mainly consist of a second channel 16, a first channel 15, and a third channel. Among them, the first channel 15 is located on one side of the channel array, and the second channel 16 is located on the other side of the channel array, that is, at both ends in the first direction of the channels 4. Moreover, both ends of the channels 4 are respectively communicated with the first channel 15 and the second channel 16. In addition, since the above-mentioned channels 4 are of equal length and flush, the first channel 15 and the second channel 16 both extend in the second direction. The two ends in the length direction of the second groove 11 of the above-mentioned channels 4 are respectively communicated with the first channel 15 and the second channel 16 through connecting holes 25. The width of the connecting hole 25 (i.e., the dimension in the second direction) is f, and the value of f is between 0.8 and 1 times the groove width of the second groove 11. The connecting holes 25 connecting the first channel 15 and the connecting holes 25 connecting the second channel 16 not only have the same number, but also have the same stroke length and hydraulic diameter, that is, the sum of the hydraulic diameters of all the connecting holes 25 communicated with the first channel 15 is equal to the sum of the hydraulic diameters of all the connecting holes 25 communicated with the second channel 16, expressed as D5 = D6. The hydraulic diameters of the first channel 15 and the second channel 16 are both set to be 0.8 - 1 times of D5. If the hydraulic diameters of the first channel 15 and the second channel 16 are different, D5 and D6 are also different, as long as the hydraulic diameter of the first channel 15 is 0.8 - 1 times of D5 and the hydraulic diameter of the second channel 16 is 0.8 - 1 times of D6. In particular, the first channel 15 has a first connection port 28 in its length direction, and the second channel 16 has a second connection port 29 in its length direction. One end of the third channel is located on the side wall of the substrate 3 to form an outlet of the fluid. The third channel is also communicated with the first connection port 28 and the second connection port 29 to form the above-mentioned second current collector structure 13.

[0050] One side wall of the substrate 3 is a first end face 8. The third channel mainly consists of a first shunt hole 17, an access hole 19, and a second shunt hole 18. Among them, one end of the access hole 19 is located on the first end face 8, and the fluid can flow out of the third flow channel through the access hole 19. The third channel can be further divided into a first shunt hole 17, a second shunt hole 18, and an access hole 19 according to its direction. Among them, all three are straight holes. One end of the access hole 19 is located on the first end face 8, and the fluid can enter the third flow channel through the access hole 19 to realize fluid injection. One end of the first shunt hole 17 is connected to the end of the access hole 19, and this end also connects one end of the second shunt hole 18. The first shunt hole 17 and the second shunt hole 18 both extend in the first direction, and the access hole 19 is perpendicular to the first direction. The three form a "T"-shaped pipeline.

[0051] Different from the first current collecting structure, the other end of the second diversion hole 18 is no longer connected to the end of the second channel 16, but is connected to the second connection port 29 through the sixth channel 27. The other end of the first diversion hole 17 is also not connected to the end of the first channel 15, but is connected to the first connection port 28 through the fifth channel 26. The second connection port 29 and the first connection port 28 can be respectively centered on the second channel 16 and the first channel 15, or can be in other positions. In this example, both the second connection port 29 and the first connection port 28 are close to the centered position. The fifth channel 26 extends from the first diversion hole 17 in the second direction. The end of the fifth channel 26 far from the first diversion hole 17 extends to the corresponding position of the first connection port 28, then turns and extends to one side of the first connection port 28 until it is connected to the first channel 15. The sixth channel 27 extends from the second diversion hole 18 in the second direction. The end of the sixth channel 27 far from the second diversion hole 18 extends to the corresponding position of the second connection port 29, and does not continue to extend in the second direction, but turns to one side of the second connection port 29 until it is connected to the second channel 16. At the same time, the central axes of the third channel, the second channel 16, and the first channel 15 are also in the same plane, which is convenient for processing. The position of the fifth channel 26 in the substrate 3 is on the side of the first channel 15 facing away from the second groove 11, and the position of the sixth channel 27 in the substrate 3 is on the side of the second channel 16 facing away from the second groove 11.

[0052] Thus, as Figures 9 to 11The fluid channels shown also form two shunt paths for the fluid to flow to the heat exchange fins 1. One is the third fluid channel, and the other is the fourth fluid channel. The third fluid channel is jointly formed by the above-mentioned first shunt hole 17, fifth channel 26, and first channel 15 that are connected in sequence. The fourth fluid channel is mainly composed of the above-mentioned second shunt hole 18, sixth channel 27, and second channel 16. The above inlet and outlet channel 19 is arranged corresponding to the center of the channel, so that the travel length of the third fluid channel is the same as that of the fourth fluid channel, and the two are in a mirror image relationship. After the fluid in the heat exchange fin 1 enters the second groove 11, it can flow towards both ends in the length direction, and is divided into two branches and flows into the first channel 15 and the second channel 16, and respectively converges at the center of the first channel 15 and the center of the second channel 16 and flows into the third channel. It can be seen that among the numerous heat exchange fins 1, the fluid flow path of the heat exchange fin 1 in the middle in the second direction is the shortest, and the pressure loss is relatively small. Therefore, this second manifold structure adopts a fluid channel that converges and discharges in the middle, which can reduce the flow path, thereby reducing the pressure loss and achieving the function of balancing the flow rate. Combining with the first manifold structure, the fluid preferentially flows into the heat exchange fin 1 from both ends in the second direction. The heat exchange fin 1 in the middle in the second direction contacts the fluid relatively later, and the pressure loss is also slightly higher. This second manifold structure uses the middle liquid discharge in the second direction to reduce the pressure loss of the fluid flowing through the heat exchange fin 1, further improving the distribution uniformity of the refrigerant in the heat exchanger and enhancing the heat exchange performance.

[0053] In addition, the first channel 15 of this second manifold structure can be arranged on the windward side of the heat exchange fin 1, while the second channel 16 is on the leeward side of the heat exchange fin 1. The hydraulic diameter of the first channel 15 can be designed to be larger than the hydraulic diameter of the second channel 16. This design is because the heat exchange efficiency on the windward side is high, the total flow rate of the refrigerant will be relatively large, and the flow velocity is relatively large. By appropriately increasing the flow aperture, the pressure loss can be reduced, and the function of balancing the flow rate can also be achieved. In this example, the hydraulic diameters of the first shunt hole 17 and the second shunt hole 18 are both set to D1, the hydraulic diameters of the fifth channel 26 and the sixth channel 27 are both set to D2, the hydraulic diameters of the first channel 15 and the second channel 16 are both set to D4, the travel length of the first shunt hole 17 in the first direction is L3, the travel length of the second shunt hole 18 in the first direction is L4, the travel length of the fifth channel 26 in the second direction is L6, and the travel length of the sixth channel 27 in the second direction is set to L7, and the following relationship needs to be ensured to hold, that is This C1 is a proportional coefficient related to the resistance coefficient, and this D2 is 1.6 to 2 times of D4.

[0054] In some other exemplary embodiments, the microchannel heat exchanger may include two first manifold structures, or include two second manifold structures.

[0055] In an exemplary embodiment, an air conditioner includes the above-described microchannel heat exchanger.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation of the present invention.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A current collection structure, characterized in that, It includes a substrate, on one side surface of which there are provided a plurality of channels for plugging and positioning with heat exchange fins; a fluid channel is provided in the substrate, and the fluid channel communicates with the plurality of channels and is configured to collect the fluid in the plurality of channels and lead out a flow collecting structure or distribute the fluid flowing into the flow collecting structure into the plurality of channels. The channel is configured as a stepped channel extending in a first direction, and the channel includes a first groove formed by inward depression from the surface of the substrate, and a second groove provided at the bottom of the first groove. The bottom of the first groove is configured to limit the heat exchange fin, and the second groove of the channel communicates with the fluid channel, and the second groove of the channel communicates with the pipe in the heat exchange fin. The channel includes alternately arranged circular groove segments and straight groove segments in the first direction. The circular groove segments are configured as circular grooves and correspond to the tubular parts of the heat exchange fins, and the straight groove segments are configured as linear grooves and correspond to the plate-shaped parts of the heat exchange fins.

2. The current collecting structure according to claim 1, characterized in that, The plurality of channels are arranged in parallel and are spaced apart along a second direction. The two ends of each channel in the first direction are flush, forming a channel array.

3. The current collecting structure according to claim 2, characterized in that The fluid channel includes a first hole and a second hole. The first hole and the second hole extend along the second direction and are respectively located at the two ends of the channel in the first direction. Both the first hole and the second hole communicate with the second groove.

4. The current collection structure according to claim 3, characterized in that, The fluid channel includes a third hole that communicates the first hole and the second hole.

5. The current collecting structure according to any one of claims 1-4, characterized in that The substrate is configured as a single piece; or the substrate includes a cover plate and a bottom plate that are detachably connected. The cover plate covers the bottom plate, and the channels are provided on the cover plate.

6. A microchannel heat exchanger, comprising a plurality of heat exchange fins, characterized in that, It further includes two flow collecting structures as described in any one of claims 1-5. The two flow collecting structures are respectively provided at the two ends of the heat exchange fin. The end of the heat exchange fin is inserted into the channel, and the channel communicates with the pipe in the heat exchange fin.

7. The microchannel heat exchanger according to claim 6, characterized in that, The heat exchange fin is welded, clamped, or connected by fasteners to the substrate.

8. An air conditioner, characterized in that, It includes a microchannel heat exchanger as described in claim 6 or 7.

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