Non-equidistant multilayer micro-channel heat exchanger

Abstract

The invention discloses a non-equidistant multilayer micro-channel heat exchanger, which relates to the technical field of heat exchangers, and comprises a shell and at least three micro-channel layers, one end of the shell is provided with a main inlet and at least one outlet, the other end of the shell is a heat source contact surface, an accommodating cavity is arranged in the shell, and the main inlet and the outlet are communicated with the cavity. Each micro-channel layer sequentially comprises an outer layer, a middle layer and an inner layer micro-channel in the cavity, the inner layer is adjacent to the heat source, and the outer layer is larger than the middle layer and larger than the inner layer; middle main flow inlets which are communicated and in one-to-one correspondence are formed in the positions, corresponding to the main inlet, of the main inlet and the outer layer and between the layers, cooling working media flow into the middle main flow inlets of the outer layer from the main inlet through the flow divider, and the tail ends of the layers are connected with corresponding exhaust ports. Communicating hole groups are formed in two sides of a main flow inlet in the middle of each layer, a plurality of fusiform fins are fixed on the upper, lower and inner side walls of each layer, the fins of each layer are the same in number but different in arrangement, and the pressure drop of an outer-layer micro-channel is smaller than that of a middle-layer micro-channel. Large temperature difference with the wall surface can be maintained, disturbance is enhanced, and heat exchange efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and in particular to a non-equidistant multilayer microchannel heat exchanger. Background Technology

[0002] High-power, highly integrated electronic devices are widely used in many cutting-edge technology fields such as aerospace, transportation, medical devices, and semiconductor chips. When electronic devices operate under high loads, the rapidly increasing heat dissipation rate severely restricts their performance and even shortens their lifespan. Therefore, improving the heat dissipation efficiency of electronic devices is crucial to overcoming their power bottlenecks. Microchannel heat sinks were first proposed by Tuckerman et al. in 1981 and have been widely used in electronic device heat dissipation due to their high heat exchange efficiency and compact structure. To optimize their overall heat exchange performance, researchers have conducted extensive research on microchannels, such as designing channels with serrated, wavy, and Tesla valve shapes; and using fins with offset pin fins, rectangular fins, and triangular fins. In addition, there has been research on the overall design of heat sinks, such as double-layer, manifold, and embedded designs.

[0003] However, existing microchannel heat exchangers still have some problems that need to be solved, such as: during operation, insufficient disturbance can lead to a continuous thickening of the thermal boundary layer, causing the temperature of the condensate to rise along the flow path, resulting in a smaller temperature difference with the wall and thus reducing heat exchange efficiency; when the flow rate of the condensate increases and the pressure drop increases, the sealing performance of the heat exchanger is challenged; uneven flow distribution can lead to local high-temperature hot spots that can damage electronic equipment; and during the phase change heat transfer process of the condensate, the bubbles generated by the phase change of the liquid are too large and difficult to remove. Summary of the Invention

[0004] The purpose of this invention is to provide a non-equidistant multi-layer microchannel heat exchanger to solve the problems existing in the prior art. It can maintain a large temperature difference with the wall, enhance disturbance, promote uniform flow distribution, and promptly break up and remove bubbles generated by the phase change of the working fluid, thereby improving heat exchange efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a non-equidistant multilayer microchannel heat exchanger, comprising a shell and at least three microchannel layers; the thickness direction of the shell is a first direction, the length direction of the shell is a second direction, and the width direction of the shell is a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; in the first direction, one end of the shell has a total inlet and at least one outlet, and the other end of the shell serves as a heat source contact surface; the shell has a receiving cavity, and the total inlet and each of the outlets are connected to the receiving cavity; each of the microchannel layers is disposed within the receiving cavity; the three... The microchannel layers are an outer microchannel, a middle microchannel, and an inner microchannel arranged sequentially along the first direction, with the inner microchannel adjacent to the heat source contact surface. In the first direction, the height of the outer microchannel is greater than the height of the middle microchannel, and the height of the middle microchannel is greater than the height of the inner microchannel. Multiple interconnected central main inlets are provided at positions corresponding to the total inlet between the main inlet and the outer microchannel, between the outer microchannel and the middle microchannel, and between the middle microchannel and the inner microchannel. In the first direction, the... Each of the outer microchannel, the intermediate microchannel, and the inner microchannel has a corresponding central main flow inlet; the cooling medium flows from the main inlet through a distributor into the central main flow inlet connected to the outer microchannel; and the ends of the outer microchannel, the intermediate microchannel, and the inner microchannel are all connected to their corresponding outlets; at least one group of connecting holes for mutual communication is formed between the outer microchannel and the intermediate microchannel, and between the intermediate microchannel and the inner microchannel, on both sides of the central main flow inlet; in the first direction, the outer microchannel, the intermediate microchannel, and the inner microchannel... Multiple spindle-shaped ribs are fixed on the upper and lower sidewalls of the intermediate microchannel and the inner microchannel. The length direction of the spindle-shaped ribs is the same as that of the second direction. Multiple spindle-shaped ribs are fixed on each inner sidewall in both the second direction and the third direction. The number of spindle-shaped ribs in the outer microchannel, the intermediate microchannel, and the inner microchannel is the same, but their arrangement is different. On the flow path from the central main inlet to the outlet, the pressure drop in the outer microchannel is less than that in the intermediate microchannel, and the pressure drop in the intermediate microchannel is less than that in the inner microchannel.

[0006] Preferably, there are two outlets, and the main inlet is located between the two outlets; the accommodating cavity is divided into a central cavity and two end cavities located at both ends of the central cavity, and the two ends of the central cavity are respectively connected to the corresponding end cavities; the main inlet is connected to the central cavity, and the outlets are corresponding to and connected to the end cavities; the outer microchannel, the middle microchannel, and the inner microchannel are all located in the central cavity, and the two ends of the outer microchannel, the middle microchannel, and the inner microchannel are respectively connected to the corresponding end cavities.

[0007] Preferably, each of the spindle-shaped ribs in the outer microchannel, the middle microchannel, and the inner microchannel is symmetrically distributed around its corresponding central main inlet; the spindle-shaped ribs have a centrally convex offset structure and possess both a large and a small tip; within the outer microchannel along the path from the central main inlet to the end cavity; a plurality of first-row rib groups are fixed on the upper sidewall of the outer microchannel, each of the first-row rib groups being spaced parallel to each other along the third direction; each first-row rib group includes a plurality of spindle-shaped ribs distributed along the second direction, in which the small tip of each spindle-shaped rib in the first-row rib group is located on the side closest to the central main inlet, and the first-row rib group... The ends of two adjacent spindle-shaped ribs are connected one after another; multiple second-row rib groups are fixed on the lower sidewall of the outer microchannel, corresponding to the positions of each of the first-row rib groups. The second-row rib groups include multiple spindle-shaped ribs distributed along the second direction. The arrangement of the spindle-shaped ribs in the second-row rib groups is the same as that in the first-row rib groups. The small tips of the spindle-shaped ribs in the second-row rib groups are located on the side closer to the central main inlet; and the spindle-shaped ribs on the upper sidewall of the outer microchannel correspond one-to-one with the spindle-shaped ribs on the lower sidewall of the outer microchannel in both the second direction and the third direction; the layer height of the outer microchannel is the sum of the heights of two spindle-shaped ribs.

[0008] Preferably, within the intermediate layer microchannel along the path from the central main inlet to the end cavity; a plurality of third-row rib groups are fixedly disposed on the upper sidewall of the intermediate layer microchannel, each of the third-row rib groups being distributed parallel to each other at intervals along the third direction; each third-row rib group includes a plurality of spindle-shaped ribs distributed along the second direction, in the second direction, the small tips of each spindle-shaped rib in the third-row rib group are located on the side close to the end cavity, and the ends of each two adjacent spindle-shaped ribs in the third-row rib group are connected sequentially and closely; a plurality of fourth-row rib groups are fixed on the lower sidewall of the intermediate layer microchannel. Each of the fourth column rib groups is distributed parallel to each other along the third direction; and in the third direction, each of the fourth column rib groups is located between two adjacent third column rib groups; each fourth column rib group includes a plurality of spindle-shaped ribs distributed along the second direction, and in the second direction, the small tip of each spindle-shaped rib in the fourth column rib group is located on the side close to the central main inlet, and the ends of each two adjacent spindle-shaped ribs in the fourth column rib group are connected one after another; in the third direction, the spindle-shaped ribs of each third column rib group are aligned with the spindle-shaped ribs of each fourth column rib group.

[0009] Preferably, within the inner microchannel along the path from the central main inlet to the end cavity; a plurality of fifth-column rib groups and a plurality of sixth-column rib groups are fixedly disposed on the upper sidewall of the inner microchannel, the fifth-column rib groups and the sixth-column rib groups being arranged alternately and parallelly in the third direction; each of the fifth-column rib groups and the sixth-column rib groups includes a plurality of spindle-shaped ribs distributed along the second direction, each pair of adjacent spindle-shaped ribs in the fifth-column rib group and the sixth-column rib group being spaced apart by one spindle-shaped rib, and in the third direction, the space between each spindle-shaped rib in the sixth-column rib group and the space between adjacent pairs of spindle-shaped ribs in the fifth-column rib group are aligned with the space between adjacent pairs of spindle-shaped ribs in the fifth-column rib group; a plurality of seventh-column rib groups and a plurality of eighth-column rib groups are fixedly disposed on the lower sidewall of the inner microchannel, the seventh-column rib groups and the eighth-column rib groups being arranged alternately and parallelly in the third direction. The ribs are arranged in a staggered parallel distribution; both the seventh and eighth rib groups include multiple spindle-shaped ribs distributed along the second direction. Each pair of adjacent spindle-shaped ribs in both the seventh and second rib groups is spaced apart by one spindle-shaped rib. Furthermore, in the third direction, the space between adjacent spindle-shaped ribs in the eighth rib group is aligned with that in the seventh rib group. In the second direction, the fifth and seventh rib groups are located in the same column, and the sixth and eighth rib groups are also located in the same column. In the third direction, the space between adjacent spindle-shaped ribs in the fifth rib group is aligned with that in the seventh rib group, and the space between adjacent spindle-shaped ribs in the sixth rib group is aligned with that in the eighth rib group.

[0010] Preferably, the housing includes an upper top plate and a lower base plate; the upper top plate is provided with the main inlet and two outlets, the axis of the main inlet being parallel to the first direction; the lower base plate has a receiving groove, and the upper top plate can close the opening of the receiving groove to form the receiving cavity; the end of the lower base plate away from the upper top plate serves as the heat source contact surface; the upper top plate and the lower base plate are provided with fixing connection holes for connection around their perimeters; an outer heat dissipation plate, a middle heat dissipation plate, and an inner heat dissipation plate are sequentially arranged along the first direction in the central cavity; An outer microchannel is formed between the outer heat sink and the middle heat sink, an intermediate microchannel is formed between the middle heat sink and the inner heat sink, and an inner microchannel is formed between the inner heat sink and the inner bottom wall of the cavity. The outer heat sink, the middle heat sink, and the inner heat sink are provided with multiple corresponding central main inlets at their respective midpoints. The middle heat sink and the inner heat sink are provided with two sets of connecting holes, and the outer heat sink is provided with two sets of dispersive holes that can communicate with the main inlet.

[0011] Preferably, the distributor is a distributor plate; the upper top plate is provided with a distributor receiving groove for placing the distributor plate; a protrusion is fixed on the top of the distributor plate, the top of the protrusion has a parabolic slope, and multiple main inlets penetrating along the first direction are opened on the parabolic slope, each main inlet is arranged along the third direction, and the lower end of the distributor plate is provided with downward-opening distributor grooves corresponding to the positions of each main inlet, the two ends of the distributor grooves extending along the second direction; and the width of the distributor grooves gradually decreases from the main inlet to both ends; in the third direction, the length of each distributor groove gradually shortens from the center to both ends; the two dispersion hole groups are located on both sides of each of the central main inlets on the outer heat sink plate and are symmetrically distributed; The dispersion hole group includes multiple primary dispersion holes, each of which is arranged along an arc and corresponds one-to-one with the corresponding end of the diversion channel and is connected; the two connecting hole groups on the intermediate heat sink and the inner heat sink are respectively located on both sides of the corresponding central main inlet; the connecting hole group includes multiple connecting through holes, each of which is arranged along an arc and the arc opening of each connecting through hole faces the same direction as the arc opening of the primary dispersion holes; in the projection in the first direction, the dispersion hole group on the outer heat sink is located inside the connecting hole group on the intermediate heat sink, and the connecting hole group on the intermediate heat sink is located inside the connecting hole group on the inner heat sink.

[0012] Preferably, the highest point of the thickest part of the spindle-shaped rib is one-third of the total length of the spindle-shaped rib, and the large tip is closer to the thickest part of the spindle-shaped rib than the small tip.

[0013] Preferably, an annular primary sealing ring is provided at the joint between the upper top plate and the lower base plate; and an annular secondary sealing ring is provided between the outer side of the diversion receiving groove and the upper surface of the outer heat dissipation plate.

[0014] Preferably, each of the central main inlets and each of the connecting through holes on the intermediate heat sink are oblique openings that avoid the spindle-shaped ribs on the upper and lower surfaces of the intermediate heat sink.

[0015] The present invention achieves the following technical effects compared to the prior art: The non-equidistant multilayer microchannel heat exchanger provided by this invention features three non-equidistant microchannel layers: an outer layer, a middle layer, and an inner layer. Each layer has spindle-shaped ribs on its upper and lower sidewalls, arranged in both the second and third directions (i.e., both transverse and longitudinal). This generates strong transverse and longitudinal bidirectional disturbances to the working fluid, enhancing secondary flow disturbances. Combined with the non-equidistant multilayer microchannel design, the pressure drop resistance increases from the outer layer to the inner layer, and the transverse and longitudinal disturbances also increase from the outer layer to the inner layer. This allows the cooling working fluid in the inner microchannels to absorb as much heat as possible from the heat source, with a portion of the working fluid discharged through the end openings of the inner microchannels. A small portion of the working fluid can enter the intermediate microchannel through the connecting holes between the inner and middle microchannels. Similarly, the fluid can be rapidly transferred from the middle to the outer microchannel. The middle microchannel causes the fluid to generate strong lateral and longitudinal disturbances with a lower pressure drop, continuously absorbing heat from the inner microchannel and transporting the heat away more quickly while further transferring heat to the outer layer. The outer microchannel causes the fluid to generate strong lateral and longitudinal disturbances with the lowest pressure drop, which, combined with the high-speed fluid from the main inlet, increases the overall flow velocity and expels the heat as quickly as possible. This maintains a large temperature difference between the inner working fluid and the heat source contact surface, and the larger the temperature difference, the better the heat exchange effect. Simultaneously, the interconnected perforations allow some of the heat flowing from the inner layer into the middle layer to cool down earlier than the heat exiting from the inner layer, thus mitigating the temperature rise of the downstream working fluid in the inner layer. The cooling working fluid in the middle and outer microchannels rapidly removes the heat that cannot be dissipated from the inner layer in time, maintaining a high-efficiency heat exchange logic with a large temperature difference between the inner working fluid and the heat exchange contact surface. Furthermore, the traditional single-layer microchannel is designed as a multi-layer microchannel, significantly reducing the flow resistance of each layer under the same operating conditions, and the multi-layer microchannel design can share the total inlet pressure drop. Secondly, the use of spindle-shaped fins reduces pressure drop resistance while inducing strong secondary flow in the fluid; the internal bubble flow process... The fluid is constantly compressed by the transverse and longitudinal ribs, and impacted by the fluid, thus being continuously broken into small bubbles. When some bubbles are carried into the connecting hole group, they are discharged to the upper layer under the action of internal fluid pressure, thereby inhibiting the formation of large bubbles or even gas films to a certain extent and increasing the critical heat flux density. In addition, the spindle-shaped ribs can easily induce stronger secondary flow at the tail, destroying the flow boundary layer, thus avoiding the occurrence of an excessively thick thermal boundary layer and enhancing the heat transfer effect of the working fluid at low Reynolds numbers. Furthermore, due to its unique streamlined design, the spindle-shaped ribs greatly reduce the impact force of the working fluid and protect the shape of the ribs, making them particularly suitable for cooling working fluids containing solid particle mixtures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 2 An exploded view of the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 3 A schematic diagram of the non-equidistant multilayer microchannel heat exchanger provided by the present invention, showing the arrangement of spindle-shaped ribs in each microchannel layer in the second direction. Figure 4 A schematic diagram of the assembly of spindle-shaped ribs in each microchannel layer of the non-equidistant multilayer microchannel heat exchanger provided by the present invention. Figure 5 A schematic cross-sectional view of the total inlet in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 6 A schematic diagram of the upper top plate in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 7 A schematic cross-sectional view of the outlet in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 8 A schematic diagram of the distribution plate in the non-equidistant multilayer microchannel heat exchanger provided by the present invention (a half-sectional view and a bottom view are provided for clarity of its structure). Figure 9 A schematic diagram of the spindle-shaped fins in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 10 A longitudinal cross-sectional view of the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 11 A schematic diagram of the structure of the outer heat dissipation plate in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 12 A schematic diagram of the structure of the middle layer heat dissipation plate in the non-equidistant multilayer microchannel heat exchanger provided by the present invention; Figure 13 This is a schematic diagram of the structure of the inner heat dissipation plate in the non-equidistant multilayer microchannel heat exchanger provided by the present invention.

[0018] In the picture: 1-Top plate; 101-Main inlet; 102-Outlet; 103-Primary sealing ring; 104-Secondary sealing ring; 105-Rectangular groove; 2-Lower substrate; 201-Heat source contact surface; 202-End cavity; 203-Seventh row of ribs; 204-Eighth row of ribs; 3-Outer heat sink; 301-First row of fins; 302-Central main inlet; 303-Primary dispersion holes; 4-Intermediate layer heat sink; 401-Second row of fins; 402-Third row of fins; 403-Connecting through hole; 5 - Inner heat sink; 501 - Fourth row of fins; 502 - Fifth row of fins; 503 - Sixth row of fins; 6-Fusiform ribs; 601-Large apex; 602-Small apex; 7-Diverter plate; 701-Protrusion; 702-Parabolic slope; 703-Main main inlet; 704-Diverter channel; 801 - First direction; 802 - Second direction; 803 - Third direction. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a non-equidistant multi-layer microchannel heat exchanger to solve the problems existing in the prior art. It can maintain a large temperature difference with the wall, enhance disturbance, promote uniform flow distribution, and promptly break up and remove bubbles generated by the phase change of the working fluid, thereby improving heat exchange efficiency.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 This embodiment provides a non-equidistant multilayer microchannel heat exchanger, such as... Figures 1-13As shown, it includes a shell and at least three microchannel layers; the thickness direction of the shell is a first direction 801, the length direction of the shell is a second direction 802, and the width direction of the shell is a third direction 803, with the first direction 801, the second direction 802, and the third direction 803 being perpendicular to each other; along the first direction 801, one end of the shell has a total inlet 101 and at least one outlet 102, and the other end of the shell serves as a heat source contact surface 201; the shell has a receiving cavity, with the total inlet 101 and each outlet 102 communicating with the receiving cavity; each microchannel layer is disposed within the receiving cavity; the three microchannel layers are respectively arranged sequentially along the first direction 801. The system comprises an outer layer microchannel, an intermediate layer microchannel, and an inner layer microchannel, with the inner layer microchannel immediately adjacent to the heat source contact surface 201. In the first direction 801, the outer layer microchannel has a greater height than the intermediate layer microchannel, and the intermediate layer microchannel has a greater height than the inner layer microchannel (e.g., the outer layer microchannel has a height of 1mm in the first direction 801, the intermediate layer microchannel has a height of 0.9mm, and the inner layer microchannel has a height of 0.8mm, with a 0.1mm difference between adjacent layers). Multiple microchannels are positioned corresponding to the total inlet 101 at the locations between the total inlet 101 and the outer layer microchannel, between the outer layer microchannel and the intermediate layer microchannel, and between the intermediate layer microchannel and the inner layer microchannel. The interconnected central main inlet 302, in the first direction 801, corresponds one-to-one with the central main inlets 302 of the outer layer microchannel, the middle layer microchannel, and the inner layer microchannel; the cooling working fluid flows from the main inlet 101 into the central main inlet 302 connected to the outer layer microchannel via a distributor; and the ends of the outer layer microchannel, the middle layer microchannel, and the inner layer microchannel are all connected to the corresponding outlet 102; at least one group of connecting holes for mutual communication is opened between the outer layer microchannel and the middle layer microchannel, and between the middle layer microchannel and the inner layer microchannel, on both sides of the central main inlet 302; in the first direction 801, the outer layer microchannel, the middle layer microchannel, the middle layer microchannel, and the inner layer microchannel are connected to the central main inlet 302. Multiple spindle-shaped ribs 6 are fixed on the upper and lower sidewalls of the interlayer microchannel and the inner microchannel. The length direction of the spindle-shaped ribs 6 is the same as that of the second direction 802. Multiple spindle-shaped ribs 6 are fixed on the inner sidewalls of the second direction 802 and the third direction 803. The number of spindle-shaped ribs 6 in the outer microchannel, the intermediate microchannel and the inner microchannel is the same but the arrangement is different. In the flow path from the central mainstream inlet 302 to the outlet 102, the pressure drop in the outer microchannel is less than that in the intermediate microchannel (due to the different spacing and the different distribution of each spindle-shaped rib 6, the pressure drop is less than that in the inner microchannel).

[0023] By setting up three non-equidistant microchannel layers—an outer layer, a middle layer, and an inner layer—with spindle-shaped ribs 6 on the upper and lower sidewalls of each layer, arranged in both the second direction 802 and the third direction 803 (i.e., spindle-shaped ribs 6 are set in both the transverse and longitudinal directions), strong transverse and longitudinal bidirectional disturbances are generated on the working fluid, enhancing secondary flow disturbances. Combined with the non-equidistant multi-layer microchannel design, the pressure drop resistance of each layer increases from the outer layer to the inner layer, and the transverse and longitudinal disturbances of each layer also increase from the outer layer to the inner layer. This allows the cooling working fluid in the inner microchannel to exchange heat from the heat source as much as possible. A portion of the working fluid is discharged from the end opening of the inner microchannel to the outlet 102, and a small portion... The working fluid can enter the intermediate microchannel through the connecting holes between the inner and middle microchannels, and the same applies to the outer microchannel, rapidly transferring heat to the outer layer. The intermediate microchannel causes the fluid to generate strong lateral and longitudinal disturbances with a lower pressure drop, continuously absorbing heat from the inner microchannel and transporting the heat flow away more quickly while further transferring heat to the outer layer. The outer microchannel causes the fluid to generate strong lateral and longitudinal disturbances with the lowest pressure drop, which, together with the high-speed fluid from the main inlet 101, increases the overall flow velocity and discharges the heat flow as quickly as possible. This maintains a large temperature difference between the inner working fluid and the heat source contact surface 201. The larger the temperature difference, the better the heat exchange effect. Simultaneously, the interconnected perforation allows some of the heat flow from the inner layer to enter the middle layer and cool down earlier than the heat discharged from the inner layer, thus alleviating the temperature rise of the downstream working fluid in the inner layer. The cooling working fluid in the middle and outer microchannels quickly removes the heat that cannot be discharged from the inner layer in time, thereby maintaining a large temperature difference between the inner working fluid and the heat exchange contact surface for efficient heat exchange. Furthermore, the traditional single-layer microchannel is designed as a multi-layer microchannel, which significantly reduces the flow resistance of each layer under the same operating conditions. The multi-layer microchannel design can also share the total inlet pressure drop, thereby alleviating the sealing pressure of the entire heat exchanger without sacrificing fluid turbulence, enabling stable operation under high Reynolds number conditions. Secondly, the use of spindle-shaped fins 6 reduces pressure drop resistance while inducing... The guide fluid generates a strong secondary flow; the bubbles generated inside are constantly squeezed by the transverse and longitudinal ribs during the flow process, and are further broken into small bubbles by the impact of the fluid. When some bubbles are carried to the connecting hole group, they are discharged to the upper layer under the action of internal fluid pressure, thereby inhibiting the formation of large bubbles or even gas films to a certain extent and increasing the critical heat flux density. The spindle-shaped ribs 6 can also easily induce a stronger secondary flow at the tail of the spindle, destroying the flow boundary layer, thereby avoiding the occurrence of an excessively thick thermal boundary layer and enhancing the heat transfer effect of the working fluid at low Reynolds numbers. Moreover, due to its unique streamlined design, the spindle-shaped ribs 6 greatly reduce the impact force of the working fluid and protect the shape of the ribs, making it especially suitable for cooling working fluids containing solid particle mixtures.

[0024] The following are the specifications regarding the casing: Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 10 As shown, there are two outlets 102, and the main inlet 101 is located between the two outlets 102. The accommodating cavity is divided into a central cavity and two end cavities 202 located at both ends of the central cavity. The two ends of the central cavity are respectively connected to the corresponding end cavities 202. The main inlet 101 is connected to the central cavity, and the outlets 102 correspond one-to-one with and are connected to the end cavities 202. The outer microchannel, the middle microchannel, and the inner microchannel are all located in the central cavity, and the two ends of the outer microchannel, the middle microchannel, and the inner microchannel are respectively connected to the corresponding end cavities 202.

[0025] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 1-7 , Figures 9-13 As shown, the housing includes an upper top plate 1 and a lower base plate 2; the upper top plate 1 is provided with a main inlet 101 and two outlets 102 (the dimensions of the main inlet 101 and outlets 102 can be set according to actual conditions, such as the main inlet 101 having an inner diameter of 7mm and an outer diameter of 8mm, and the two outlets 102 being identical, with an inner diameter of 5mm and an outer diameter of 6mm), the axial direction of the main inlet 101 is parallel to the first direction 801; the lower base plate 2 has a receiving groove, and the upper top plate 1 can close the opening of the receiving groove to form a receiving cavity; the end of the lower base plate 2 away from the upper top plate 1 serves as a heat source contact surface 201; the upper top plate 1 and the lower base plate 2 are provided with fixing connection holes for connection (in a flange-like connection structure) around their perimeter. The components are fixedly connected in a form such as 26 holes in the circumferential direction. An outer heat sink 3, a middle heat sink 4, and an inner heat sink 5 are arranged sequentially along the first direction 801 in the central cavity. An outer microchannel is formed between the outer heat sink 3 and the middle heat sink 4, a middle microchannel is formed between the middle heat sink 4 and the inner heat sink 5, and an inner microchannel is formed between the inner heat sink 5 and the inner bottom wall of the cavity. Multiple central main inlets 302 are opened in the middle of the outer heat sink 3, the middle heat sink 4, and the inner heat sink 5. Two sets of connecting holes are opened on the middle heat sink 4 and the inner heat sink 5, and two sets of dispersing holes are opened on the outer heat sink 3 that can communicate with the main inlet 101.

[0026] Specifically, the lower substrate 2 has limiting grooves on both sides of the central cavity, the inner heat sink 5 is placed in the limiting grooves on both sides, and the middle heat sink 4 has vertical plates fixed at both ends. The vertical plates are located in the limiting grooves and the lower end of the vertical plates is pressed against the upper end surface of the inner heat sink 5. The outer heat sink 3 is located in the corresponding limiting grooves on both sides and is located at the upper end of the vertical plates.

[0027] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 5 , Figure 10 As shown, an annular primary sealing ring 103 is provided at the joint between the upper top plate 1 and the lower base plate 2 (an annular sealing groove is provided at the corresponding position of the lower base plate 2, and the primary sealing ring 103 is disposed in the annular sealing groove); and an annular secondary sealing ring 104 is provided between the outer side of the diversion receiving groove and the upper surface of the outer heat sink 3 (same as above, such as a groove for placing the secondary sealing ring 104 is provided circumferentially in the diversion receiving groove of the upper top plate 1). Specifically, the primary sealing ring 103 and the secondary sealing ring 104 can be rectangular silicone sealing rings with a diameter of 1mm.

[0028] The following are the settings instructions regarding multiple microchannel layers: Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 2-5 , Figure 9 As shown, the highest point of the thickest part of the spindle rib 6 is one-third of the total length of the spindle rib 6 (that is, if the total length is 1.5 mm, the highest point is the top of the large tip 601 from the starting point to 0.5 mm), and the large tip 601 is closer to the thickest part of the spindle rib 6 than the small tip 602.

[0029] Specifically, for the outer microchannel and the middle microchannel, the spacing between adjacent rib groups on the top or bottom is between one and two times the total length of a single spindle-shaped rib 6; and for the rib groups on the top or bottom of the inner microchannel, the spacing between a row (such as the first row of rib groups and the third row of rib groups) is between one and two times the total length of a single spindle-shaped rib 6; so as to effectively form a secondary flow.

[0030] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 2-5 , Figures 9-12As shown, each spindle-shaped rib 6 in the outer microchannel, middle microchannel, and inner microchannel is symmetrically distributed around its corresponding central main inlet 302. The spindle-shaped rib 6 has a centrally protruding offset structure and possesses a large tip 601 and a small tip 602. Within the outer microchannel along the path from the central main inlet 302 to the end cavity 202 (i.e., each spindle-shaped rib 6 within the outer microchannel is a double-sided aligned rectangular array), multiple first-row rib groups 301 are fixed on the upper sidewall of the outer microchannel (i.e., the lower surface of the outer heat sink 3). Each first-row rib group 301 is spaced parallel to each other along a third direction 803. Each first-row rib group 301 includes multiple spindle-shaped ribs 6 distributed along a second direction 802. In the second direction 802, the small tips 602 of each spindle-shaped rib 6 in the first-row rib group 301 are located near the central main inlet 302. On one side of 02, the ends of two adjacent spindle-shaped ribs 6 in the first column rib group 301 are connected one after another; on the lower side wall of the outer microchannel (i.e., on the upper surface of the middle layer heat sink 4), a number of second column rib groups 401 are fixed at the positions corresponding to each first column rib group 301. The second column rib group 401 includes a number of spindle-shaped ribs 6 distributed along the second direction 802. The arrangement of each spindle-shaped rib 6 in the second column rib group 401 is the same as that in the first column rib group 301. The small tip 602 of the spindle-shaped rib 6 in the second column rib group 401 is located on the side near the middle mainstream inlet 302; and the spindle-shaped ribs 6 on the upper side wall of the outer microchannel correspond one-to-one with the spindle-shaped ribs 6 on the lower side wall of the outer microchannel in the second direction 802 and the third direction 803; the layer height of the outer microchannel is the sum of the heights of two spindle-shaped ribs 6.

[0031] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 2-5 , Figures 9-13As shown, within the intermediate layer microchannel along the path from the central main inlet 302 to the end cavity 202 (i.e., each spindle-shaped rib 6 within the intermediate layer microchannel is a double-sided, bidirectional rectangular array); multiple third-row rib groups 402 are fixedly arranged on the upper sidewall of the intermediate layer microchannel (i.e., on the lower surface of the intermediate layer heat sink 4), and each third-row rib group 402 is distributed parallel to each other along the third direction 803; the third-row rib group 402 includes multiple spindle-shaped ribs 6 distributed along the second direction 802, and in the second direction 802, the small tips 602 of each spindle-shaped rib 6 in the third-row rib group 402 are all located on the side close to the end cavity 202, and the ends of each two adjacent spindle-shaped ribs 6 in the third-row rib group 402 are connected one after the other; on the lower sidewall of the intermediate layer microchannel (i.e., the inner... On the upper surface of the heat sink 5, a plurality of fourth column rib groups 501 are fixed, and each fourth column rib group 501 is distributed parallel to each other along the third direction 803; and on the third direction 803, each fourth column rib group 501 is located between two adjacent third column rib groups 402; the fourth column rib group 501 includes a plurality of spindle-shaped ribs 6 distributed along the second direction 802, and on the second direction 802, the small tip 602 of each spindle-shaped rib 6 of the fourth column rib group 501 is located on the side near the central main inlet 302, and the ends of each two adjacent spindle-shaped ribs 6 in the fourth column rib group 501 are connected one after another; on the third direction 803, the spindle-shaped ribs 6 of each third column rib group 402 are aligned with the spindle-shaped ribs 6 of each fourth column rib group 501.

[0032] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 10 , Figure 12 As shown, each central main inlet 302 and each connecting through hole 403 on the intermediate heat sink 4 are oblique openings that avoid the spindle-shaped ribs 6 on the upper and lower surfaces of the intermediate heat sink 4.

[0033] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 2-5 , Figures 9-13As shown, within the inner microchannel along the path from the central main inlet 302 to the end cavity 202 (i.e., each spindle-shaped rib 6 within the inner microchannel is arranged in a double-sided double-cross array); multiple fifth-row rib groups 502 and multiple sixth-row rib groups 503 are fixedly arranged on the upper sidewall of the inner microchannel (i.e., on the lower surface of the inner heat sink 5), the fifth-row rib groups 502 and the sixth-row rib groups 503 are sequentially and alternately distributed in parallel along the third direction 803; both the fifth-row rib groups 502 and the sixth-row rib groups 503 include multiple... The spindle-shaped ribs 6 distributed in the second direction 802 are arranged such that adjacent two spindle-shaped ribs 6 in the fifth column rib group 502 and the sixth column rib group 503 are spaced apart by one spindle-shaped rib 6. Furthermore, in the third direction 803, the space between each spindle-shaped rib 6 in the sixth column rib group 503 and the adjacent two spindle-shaped ribs 6 in the fifth column rib group 502 is aligned. Multiple seventh column rib groups 203 and multiple eighth column rib groups 204 are fixedly arranged on the lower sidewall of the inner microchannel (i.e., the inner bottom of the central cavity). The seventh and eighth rib groups 203 and 204 are arranged alternately and parallelly along the third direction 803. Both the seventh and eighth rib groups 203 and 204 include multiple spindle-shaped ribs 6 distributed along the second direction 802. In the seventh and second rib groups 203 and 201, each pair of adjacent spindle-shaped ribs 6 is spaced apart by one spindle-shaped rib 6. Furthermore, in the third direction 803, the spindle-shaped ribs 6 of the eighth rib group 204 are spaced apart from each adjacent pair of adjacent spindle-shaped ribs 6 in the seventh rib group 203. The spacing between the ribs is aligned; in the second direction 802, the fifth rib group 502 and the seventh rib group 203 are in the same column, and the sixth rib group 503 and the eighth rib group 204 are in the same column; and in the third direction 803, the spacing between each spindle-shaped rib 6 of the fifth rib group 502 and the spacing between two adjacent spindle-shaped ribs 6 in the seventh rib group 203 are aligned, and the spacing between each spindle-shaped rib 6 of the sixth rib group 503 and the spacing between two adjacent spindle-shaped ribs 6 in the eighth rib group 204 are aligned.

[0034] The following are the settings instructions for the distribution panel 7: Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 2-5 , Figure 6 , Figures 8-13As shown, the distributor is a distributor plate 7; the upper top plate 1 is provided with a distributor receiving groove for placing the distributor plate 7 (the distributor receiving groove includes a rectangular groove 105 corresponding to each main inlet 703 on the distributor plate 7 and a receiving groove for accommodating the disc of the distributor plate 7, the receiving groove is located below the rectangular groove 105, and the protrusion 701 is located inside the rectangular groove 105); the top of the distributor plate 7 is fixed with a protrusion 701, the top of the protrusion 701 has a parabolic slope 702, the parabola Multiple main inlets 703 extending along the first direction 801 are provided on the slope surface 702. Each main inlet 703 is arranged along the third direction 803. At the lower end of the diversion plate 7, corresponding to the position of each main inlet 703, downward-opening diversion channels 704 are respectively provided. The two ends of each diversion channel 704 extend along the second direction 802; and the width of the diversion channel 704 gradually decreases from the main inlet 703 towards both ends. On the third direction 803, each diversion channel 704... The length of 04 gradually shortens from the center to both ends; two groups of dispersion holes are located on both sides of the main inlet 302 in the middle of the outer heat sink 3 and are symmetrically distributed; the dispersion hole group includes multiple primary dispersion holes 303, each primary dispersion hole 303 is arranged along an arc, and each primary dispersion hole 303 corresponds to and is connected to the corresponding end of the diversion channel 704; the two groups of connecting holes on the middle heat sink 4 and the inner heat sink 5 are located on both sides of the corresponding main inlet 302 in the middle; the connecting hole group includes multiple connecting through holes 403, each connecting through hole 403 is arranged along an arc, and the arc opening of each connecting through hole 403 is oriented in the same direction as the arc opening of the primary dispersion holes 303; on the projection in the first direction 801, the dispersion hole group on the outer heat sink 3 is located inside the connecting hole group on the middle heat sink 4, and the connecting hole group on the middle heat sink 4 is located inside the connecting hole group on the inner heat sink 5.

[0035] Specifically, the working principle of the diversion plate 7 is explained as follows: After the fluid working medium enters from the main inlet 101 and impacts the top arc-shaped surface (parabolic slope 702) of the diversion plate 7, it is dispersed to both sides by the oblique force generated by the slope, which plays a primary role in diversion. Since the lengths of the diversion channels 704 on the third direction 803 are different, the pressure drop in the middle channel is high and the pressure drop on both sides is low. This again excites the fluid working medium entering the main flow inlet 703 to disperse to the main flow inlets 703 on both sides, which plays a secondary role in diversion. At the same time, each diversion channel 704 adopts a tapered setting to accelerate the fluid and flow into the outer microchannel, thereby increasing the fluid velocity in the microchannel.

[0036] Specifically, the flow distribution plate 7 can evenly distribute the flow rate to each main inlet 703. In conjunction with the flow distribution groove 704 and the primary dispersion hole 303, it can accelerate the flow of fluid into the outer microchannel, resulting in a more uniform flow rate and faster velocity in the outer layer. Each connecting through hole 403 can not only promote uniform flow distribution, but also mix the working fluid flow between two adjacent microchannel layers, further reducing the fluid temperature in the microchannel layer near the heat source contact surface 201. More importantly, the bubbles in the inner layer can be discharged to the outer layer (the middle layer opposite to the inner layer and the outer layer opposite to the middle layer) through the connecting through holes 403, and discharged from the outer layer to the outlet 102, which greatly inhibits the formation of the inner layer gas film.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A non-equidistant multilayer microchannel heat exchanger, characterized in that: Includes a shell and at least three microchannel layers; The thickness direction of the shell is a first direction, the length direction of the shell is a second direction, and the width direction of the shell is a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. In the first direction, one end of the housing has a main inlet and at least one outlet, and the other end of the housing serves as a heat source contact surface; the housing has a receiving cavity, and the main inlet and each of the outlets are in communication with the receiving cavity; Each of the aforementioned microchannel layers is disposed within the accommodating cavity; the three microchannel layers are respectively an outer microchannel, a middle microchannel, and an inner microchannel arranged sequentially along the first direction, with the inner microchannel being adjacent to the heat source contact surface; in the first direction, the height of the outer microchannel is greater than the height of the middle microchannel, and the height of the middle microchannel is greater than the height of the inner microchannel; multiple interconnected connections are provided at positions corresponding to the total inlet between the main inlet and the outer microchannel, between the outer microchannel and the middle microchannel, and between the middle microchannel and the inner microchannel. In the first direction, the central main inlet of the outer microchannel, the middle microchannel, and the inner microchannel correspond one-to-one; the cooling working fluid flows from the main inlet into the central main inlet connected to the outer microchannel via a distributor; and the ends of the outer microchannel, the middle microchannel, and the inner microchannel are all connected to the corresponding outlets; at least one group of connecting holes for mutual communication is opened between the outer microchannel and the middle microchannel, and between the middle microchannel and the inner microchannel, on both sides of the central main inlet. In the first direction, multiple spindle-shaped ribs are fixed on the upper and lower sidewalls of the outer microchannel, the middle microchannel, and the inner microchannel. The length direction of the spindle-shaped ribs is the same as that of the second direction, and multiple spindle-shaped ribs are fixed on each inner sidewall in both the second direction and the third direction. The number of spindle-shaped ribs in the outer microchannel, the middle microchannel, and the inner microchannel is the same, but their arrangement is different. In the flow path from the central main inlet to the outlet, the pressure drop in the outer microchannel is less than that in the middle microchannel, and the pressure drop in the middle microchannel is less than that in the inner microchannel.

2. The non-equidistant multilayer microchannel heat exchanger according to claim 1, characterized in that: There are two discharge outlets, and the total inlet is located between the two discharge outlets; The accommodating cavity is divided into a central cavity and two end cavities located at both ends of the central cavity. The two ends of the central cavity are respectively connected to the corresponding end cavities. The main inlet is connected to the central cavity, and the outlet is connected to each of the end cavities. The outer microchannel, the middle microchannel, and the inner microchannel are all located within the central cavity, and the two ends of the outer microchannel, the middle microchannel, and the inner microchannel are respectively connected to the corresponding end cavities.

3. The non-equidistant multilayer microchannel heat exchanger according to claim 2, characterized in that: Each of the spindle-shaped ribs in the outer microchannel, the middle microchannel, and the inner microchannel is symmetrically distributed around the corresponding central main inlet; the spindle-shaped ribs have a centrally protruding and offset structure, and each spindle-shaped rib has a large tip and a small tip; Within the outer microchannel along the path from the central main inlet to the end cavity; Multiple first-row rib groups are fixed on the upper sidewall of the outer microchannel, and each first-row rib group is distributed parallel to each other along the third direction; the first-row rib group includes multiple spindle-shaped ribs distributed along the second direction, and in the second direction, the small tip of each spindle-shaped rib in the first-row rib group is located on the side close to the central main inlet, and the ends of each two adjacent spindle-shaped ribs in the first-row rib group are connected one after the other. On the lower sidewall of the outer microchannel, a plurality of second rib groups are fixed at positions corresponding to each of the first rib groups. The second rib groups include a plurality of spindle-shaped ribs distributed along the second direction. The arrangement of the spindle-shaped ribs in the second rib groups is the same as that in the first rib groups. The small tips of the spindle-shaped ribs in the second rib groups are located on the side closer to the central main inlet. The spindle-shaped ribs on the upper sidewall of the outer microchannel correspond one-to-one with the spindle-shaped ribs on the lower sidewall of the outer microchannel in both the second direction and the third direction. The layer height of the outer microchannel is the sum of the heights of two spindle-shaped ribs.

4. The non-equidistant multilayer microchannel heat exchanger according to claim 3, characterized in that: Within the intermediate layer microchannel along the path from the central main inlet to the end cavity; Multiple third-row rib groups are fixedly disposed on the upper sidewall of the intermediate layer microchannel, and each third-row rib group is distributed parallel to each other along the third direction; each third-row rib group includes multiple spindle-shaped ribs distributed along the second direction, and in the second direction, the small tip of each spindle-shaped rib in the third-row rib group is located on the side close to the end cavity, and the ends of each two adjacent spindle-shaped ribs in the third-row rib group are connected one after the other. Multiple fourth-row rib groups are fixed on the lower sidewall of the intermediate layer microchannel, and each fourth-row rib group is distributed parallel to each other along the third direction; and in the third direction, each fourth-row rib group is located between two adjacent third-row rib groups; the fourth-row rib group includes multiple spindle-shaped ribs distributed along the second direction, and in the second direction, the small tip of each spindle-shaped rib in the fourth-row rib group is located on the side close to the central main inlet, and the ends of each two adjacent spindle-shaped ribs in the fourth-row rib group are connected one after the other; In the third direction, the spindle-shaped ribs of each of the third column rib groups are aligned with the spindle-shaped ribs of each of the fourth column rib groups.

5. The non-equidistant multilayer microchannel heat exchanger according to claim 4, characterized in that: Within the inner microchannel along the path from the central main inlet to the end cavity; Multiple fifth-column rib groups and multiple sixth-column rib groups are fixedly disposed on the upper sidewall of the inner microchannel. The fifth-column rib groups and the sixth-column rib groups are arranged alternately and parallelly in the third direction. Each of the fifth-column rib groups and the sixth-column rib groups includes multiple spindle-shaped ribs distributed along the second direction. Each pair of adjacent spindle-shaped ribs in the fifth-column rib group and the sixth-column rib group are arranged with a gap of one spindle-shaped rib size. In the third direction, the space between each spindle-shaped rib in the sixth-column rib group and the space between adjacent pairs of spindle-shaped ribs in the fifth-column rib group are aligned. Multiple seventh-column rib groups and multiple eighth-column rib groups are fixedly disposed on the lower sidewall of the inner microchannel. The seventh-column rib groups and the eighth-column rib groups are arranged alternately and parallelly in the third direction. Each of the seventh-column rib groups and the eighth-column rib groups includes multiple spindle-shaped ribs distributed along the second direction. Each pair of adjacent spindle-shaped ribs in the seventh-column rib group and the second-column rib group are spaced apart by the size of one spindle-shaped rib. In the third direction, the space between each spindle-shaped rib in the eighth-column rib group and the space between adjacent pairs of spindle-shaped ribs in the seventh-column rib group are aligned. In the second direction, the fifth column of ribs is located in the same column as the seventh column of ribs, and the sixth column of ribs is located in the same column as the eighth column of ribs; and in the third direction, the space between each spindle-shaped rib in the fifth column of ribs is aligned with the space between two adjacent spindle-shaped ribs in the seventh column of ribs, and the space between each spindle-shaped rib in the sixth column of ribs is aligned with the space between two adjacent spindle-shaped ribs in the eighth column of ribs.

6. The non-equidistant multilayer microchannel heat exchanger according to claim 2, characterized in that: The housing includes an upper top plate and a lower base plate; The upper top plate is provided with the main inlet and two outlets, and the axial direction of the main inlet is parallel to the first direction; The lower substrate has a receiving groove, and the upper top plate can close the opening of the receiving groove and form the receiving cavity; the end of the lower substrate away from the upper top plate serves as the heat source contact surface; The upper top plate and the lower base plate are provided with fixing connection holes around their perimeter for connection. An outer heat dissipation plate, a middle heat dissipation plate, and an inner heat dissipation plate are sequentially arranged in the central cavity along the first direction; an outer microchannel is formed between the outer heat dissipation plate and the middle heat dissipation plate, a middle microchannel is formed between the middle heat dissipation plate and the inner heat dissipation plate, and an inner microchannel is formed between the inner heat dissipation plate and the inner bottom wall of the cavity. The outer heat sink, the middle heat sink, and the inner heat sink are provided with a plurality of corresponding central main inlets. The middle heat sink and the inner heat sink are provided with two sets of connecting holes, and the outer heat sink is provided with two sets of dispersing holes that can communicate with the main inlet.

7. The non-equidistant multilayer microchannel heat exchanger according to claim 6, characterized in that: The distributor is a distributor plate; the upper top plate is provided with a distributor receiving groove for placing the distributor plate; The top of the diversion plate is fixed with a protrusion, the top of the protrusion has a parabolic slope, and multiple main inlets penetrating along the first direction are opened on the parabolic slope. Each main inlet is arranged along the third direction. The lower end of the diversion plate is provided with a downward-opening diversion groove corresponding to the position of each main inlet. The two ends of the diversion groove extend along the second direction. The width of the diversion groove gradually decreases from the main inlet to both ends. In the third direction, the length of each diversion groove gradually shortens from the center to both ends. The two dispersion hole groups are located on both sides of each of the central main inlets on the outer heat sink and are symmetrically distributed; the dispersion hole group includes a plurality of primary dispersion holes, each of the primary dispersion holes is arranged along an arc, and each of the primary dispersion holes corresponds one-to-one with the corresponding end of the diversion groove and is connected. The two connecting hole groups on the intermediate heat sink and the inner heat sink are respectively located on both sides of the corresponding central main inlet; the connecting hole group includes multiple through holes, each of the through holes is arranged along an arc, and the opening direction of the arc of the arrangement of the through holes is the same as the opening direction of the arc of the arrangement of the primary dispersion holes; in the projection in the first direction, the dispersion hole group on the outer heat sink is located inside the connecting hole group on the intermediate heat sink, and the connecting hole group on the intermediate heat sink is located inside the connecting hole group on the inner heat sink.

8. The non-equidistant multilayer microchannel heat exchanger according to claim 3, characterized in that: The highest point of the thickest part of the spindle-shaped rib is one-third of the total length of the spindle-shaped rib, and the large tip is closer to the thickest part of the spindle-shaped rib than the small tip.

9. The non-equidistant multilayer microchannel heat exchanger according to claim 7, characterized in that: A primary annular sealing ring is provided at the joint between the upper top plate and the lower base plate; and a secondary annular sealing ring is provided between the outer side of the diversion receiving groove and the upper surface of the outer heat dissipation plate.

10. The non-equidistant multilayer microchannel heat exchanger according to claim 7, characterized in that: The central main inlets and the connecting through holes on the intermediate heat sink are all oblique openings that avoid the spindle-shaped ribs on the upper and lower surfaces of the intermediate heat sink.

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