IGBT (Insulated Gate Bipolar Translator) liquid cooling radiator based on four arc streaming ribs

Abstract

The utility model discloses an IGBT liquid cooling radiator based on four arc streaming ribs. The IGBT liquid cooling radiator comprises a substrate, an inlet nozzle, an outlet nozzle, a cover plate and fins. The fins are perpendicularly connected to the first surface of the base plate to form a fin array arranged in a fork shape, the outer contour of the cross section of each fin is formed by sequentially connecting four arcs, the circle centers corresponding to the four arcs are located at the four vertexes of the same plane quadrangle respectively, and the plane quadrangle is at least symmetrical about one diagonal line of the plane quadrangle. The cover plate is a flat plate with a concave area, and the cover plate is in butt joint with the base plate so that all the fins on the first surface of the base plate can enter the concave area of the cover plate. According to the utility model, the four-arc streaming fin structure with strong manufacturability is adopted, so that the convection heat exchange area can be increased, the boundary layer can be destroyed, the heat radiation capability of the IGBT can be enhanced, the flow resistance of the liquid cooling radiator can be reduced, and the heat comprehensive performance can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold plates, in particular to a liquid cooling radiator used for IGBT heat dissipation. Background Art

[0002] With the continuous advancement of power electronics technology, IGBT, as a core component in modern power electronics systems, is widely used in industrial control, energy conversion, transportation, smart grids and other fields. The performance of IGBT directly determines the efficiency and reliability of the entire power electronics system. However, with the continuous increase in operating frequency and power density, the heat generated by IGBT during operation is also increasing. Heat dissipation performance is one of the key factors affecting IGBT performance. If the heat dissipation is poor, the junction temperature of the IGBT will increase, which will affect its electrical performance and service life. Excessive junction temperature may cause the IGBT's withstand voltage to decrease, switching loss to increase, reliability to decrease, or even damage. Therefore, improving the heat dissipation performance of the IGBT is of great significance to improving its overall performance.

[0003] The fins on the cold plate are an important part of the IGBT liquid cooling radiator. Whether the design is reasonable or not directly affects the heat dissipation performance of the cold plate. The main function of the fins is to enhance the heat dissipation effect by increasing the surface area of ​​the cold plate. The shape, size, arrangement and material of the fins will affect the heat dissipation performance of the cold plate. Therefore, optimizing the design of the fins on the cold plate is one of the effective ways to improve the heat dissipation performance of the IGBT.

[0004] The characteristics of several existing fin cooling units are as follows:

[0005] Diamond rib heat sink: In terms of manufacturing, casting process cannot be used, and machining is commonly used, which has high manufacturing cost. In terms of performance, diamond ribs have many sharp corners and large flow resistance.

[0006] Cylindrical rib heat dissipation unit: difficult to machine, easy to cast, high process production efficiency, with smaller secondary heat transfer area and larger flow resistance under the same volume as diamond ribs. Summary of the invention

[0007] The utility model aims to provide an IGBT liquid-cooled radiator based on four-arc flow-around ribs, which can effectively increase the convection heat exchange area, enhance the flow-around effect, and thus enhance the heat dissipation capacity of the liquid-cooled radiator. Furthermore, it can reduce the thermal resistance of the liquid-cooled radiator and can be mass-produced and processed using a high-efficiency die-casting process.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The IGBT liquid cooling radiator based on four arc flow fins includes:

[0010] A substrate, wherein the substrate is a flat plate, and a through hole is respectively opened at both ends of the substrate in the length direction to form an inlet and an outlet;

[0011] A rib, wherein a plurality of the ribs are vertically connected on the first surface of the substrate to form a rib array, wherein the cross-sectional outer contour of the rib is formed by four arcs connected in sequence, wherein the centers of the four arcs are respectively located at four vertices of the same plane quadrilateral, and the plane quadrilateral is symmetrical about at least one diagonal line of itself;

[0012] An inlet nozzle and an outlet nozzle, wherein the inlet nozzle and the outlet nozzle are both connected to the second surface of the substrate, and the inlet nozzle is connected to a through hole corresponding to the inlet on the substrate, and the outlet nozzle is connected to a through hole corresponding to the outlet on the substrate;

[0013] The cover plate is a flat plate with a recessed area, and the cover plate is butted against the substrate so that all the ribs on the first surface of the substrate enter the recessed area of ​​the cover plate.

[0014] As an option, the heights of the plurality of fins in a direction perpendicular to the first surface of the substrate are equal.

[0015] As an option, the fin array includes fin rows perpendicular to the length direction of the substrate, in the same fin row, multiple fins are distributed in parallel and at equal intervals, and the connection line between any two fins between two adjacent fin rows is not parallel to the length direction of the substrate.

[0016] As an option, in the cross-sectional outer contour of the fin, two adjacent arcs are tangent to each other.

[0017] As an option, ribs symmetrical with respect to the through hole are arranged on both sides of the through hole of the substrate.

[0018] As an option, the cover plate is welded to the base plate.

[0019] Compared with the prior art, the fin structure based on four arcs can also form different types of fin structures by changing its aspect ratio, where the length refers to the maximum distance between two arcs in relative position and with a larger distance among the four arcs, and the width refers to the maximum distance between the other two arcs in relative position and with a smaller distance among the four arcs, and the width and length are perpendicular to each other.

[0020] Compared with the prior art, the utility model optimizes the design of the fin structure in the IGBT liquid-cooled radiator, adopts an outer contour with a cross-section composed of four circular arcs connected in sequence and closed, and uses fork-shaped fins to form a fin array. The fins with this structural feature have strong manufacturing processability and can be integrally formed with the substrate by die-casting, with high production efficiency. The arc-shaped contour increases the convective heat exchange area while increasing the flow, reduces the flow resistance, and improves the comprehensive thermal performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the appearance diagram of the IGBT liquid cooling radiator;

[0022] Figure 2 This is an exploded view of the IGBT liquid cooling radiator;

[0023] Figure 3 is a top view of a first surface of a substrate in an IGBT liquid cooling radiator;

[0024] Figure 4 is a distribution diagram of fins on a first surface of a substrate in an IGBT liquid cooling radiator;

[0025] Figure 5 It is a schematic diagram of the cross-sectional profile of the fin;

[0026] Figure 6 It is the simulation trajectory diagram of the flow around the four arc fins;

[0027] In the figure: 1-base plate, 2-inlet nozzle, 3-outlet nozzle, 4-cover plate. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0029] like Figure 1 to Figure 5As shown, the IGBT liquid cooling radiator based on four arc flow ribs includes a substrate 1, an inlet nozzle 2, an outlet nozzle 3, a cover plate 4 and fins. The substrate 1 is a flat plate. A through hole is opened at each end of the length direction of the substrate 1 to form an inlet and an outlet. Ribs symmetrical about the through hole are arranged on both sides of the through hole of the substrate 1. A plurality of fins are vertically connected on the first surface of the substrate 1 to form a fork-shaped fin array. The cross-sectional outer contour of the fin is formed by four arcs connected in sequence. The centers of the four arcs are respectively located at the four vertices of the same rhombus DBEC (i.e., points D, B, C, and E), and the rhombus is symmetrical about its two diagonal lines (in this embodiment, the radius of the arc O1O2 is equal to the radius of the arc O3O4, and the radius of the arc O1O4 is equal to the radius of the arc O2O3, so the cross section of the fin also has two symmetry axes). The inlet nozzle 2 and the outlet nozzle 3 are both connected to the second surface of the substrate 1, and the inlet nozzle 2 is connected to the through hole corresponding to the inlet on the substrate 1, and the outlet nozzle 3 is connected to the through hole corresponding to the outlet on the substrate 1. The cover plate 4 is welded to the substrate 1 to form a whole. The cover plate 4 is a flat plate with a recessed area. The cover plate 4 is connected to the substrate 1 so that the fin array on the first surface of the substrate 1 all enters the recessed area of ​​the cover plate 4, thereby forming a liquid cooling channel in the IGBT liquid cooling radiator. Corresponding screw holes are opened on the cover plate 4 and the substrate 1, and the bolts are used for the installation of the IGBT liquid cooling radiator.

[0030] like Figure 2 As shown, the heights of the multiple fins in the direction perpendicular to the first surface of the substrate 1 are equal, forming a fin array. The fin array includes fin rows perpendicular to the length direction of the substrate 1. In the same fin row, the multiple fins are parallel and evenly spaced. The connecting line of any two fins between two adjacent fin rows is not parallel to the length direction of the substrate 1, and finally a forked fin array is formed, that is, except for the fin at the edge of the array, any other fin and the four surrounding fins form a fork structure, or in other words, two intersecting line segments form a fork (X shape), there is a fin at the intersection of the fork, and there is a fin at each of the four endpoints of the two line segments. Figure 3 In order to avoid the screw hole, the fin array has some fins removed in the area near the screw hole. When the coolant flows in from the inlet nozzle 2 and flows out from the outlet nozzle 3, the coolant flows through the cross-arranged cooling channels formed by the fin array.

[0031] like Figure 5 As shown, in the cross-sectional outer contour of the fin, two adjacent arcs are tangent to each other, that is, arc O1O2 is tangent to arc O2O3, arc O2O3 is tangent to arc O3O4, arc O3O4 is tangent to arc O4O1, and arc O4O1 is tangent to arc O1O2.

[0032] Figure 6 The simulation trajectory of the flow around the four arc fins is shown.

[0033] The above is the main concept of the present invention. Any IGBT liquid cooling radiator based on four-arc flow ribs designed according to the concept of the present invention falls within the protection scope of the present invention.

Claims

1. An IGBT liquid cooling radiator based on four arc flow ribs, characterized in that: include: A substrate (1), wherein the substrate (1) is a flat plate, and a through hole is respectively provided at both ends of the substrate (1) in the length direction to form an inlet and an outlet; A rib, wherein a plurality of the ribs are vertically connected on the first surface of the substrate (1) to form a rib array, wherein the cross-sectional outer contour of the rib is formed by four arcs connected in sequence, wherein the centers of the four arcs are respectively located at four vertices of the same plane quadrilateral, and the plane quadrilateral is symmetrical about at least one of its own diagonals; An inlet nozzle (2) and an outlet nozzle (3), wherein the inlet nozzle (2) and the outlet nozzle (3) are both connected to the second surface of the substrate (1), and the inlet nozzle (2) is connected to a through hole corresponding to the inlet on the substrate (1), and the outlet nozzle (3) is connected to a through hole corresponding to the outlet on the substrate (1); The cover plate (4) is a flat plate with a recessed area, and the cover plate (4) is butted against the base plate (1) so that all the ribs on the first surface of the base plate (1) enter the recessed area of ​​the cover plate (4).

2. The IGBT liquid cooling radiator based on four-arc flow ribs according to claim 1 is characterized in that: The heights of the plurality of fins in a direction perpendicular to the first surface of the base plate (1) are equal.

3. The IGBT liquid cooling radiator based on four-arc flow ribs according to claim 1 is characterized in that: The fin array comprises fin rows perpendicular to the length direction of the substrate (1); in the same fin row, a plurality of fins are arranged in parallel and at equal intervals; and the connecting line between any two fins in two adjacent fin rows is not parallel to the length direction of the substrate (1).

4. The IGBT liquid cooling radiator based on four-arc flow-around ribs according to claim 1 is characterized in that: In the cross-sectional outer contour of the fin, two adjacent arcs are tangent to each other.

5. The IGBT liquid cooling radiator based on four-arc flow-around ribs according to claim 1 is characterized in that: Ribs symmetrical with respect to the through hole are arranged on both sides of the through hole of the substrate (1).

6. The IGBT liquid cooling radiator based on four-arc flow ribs according to claim 1 is characterized in that: The cover plate (4) is welded to the base plate (1).

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