Liquid cooling plate with streamline fin columns and efficient heat dissipation device

Abstract

The invention discloses a liquid cooling plate with streamline fin columns and an efficient liquid cooling device, the liquid cooling plate comprises a liquid cooling plate body and a cover plate, one side of the liquid cooling plate body is provided with a liquid guide groove, one end of the liquid cooling plate body is provided with a liquid inlet pipe, the other end of the liquid cooling plate body is provided with a liquid outlet pipe, and the groove bottom of the liquid guide groove is provided with a plurality of streamline fin columns; the fin column comprises a column body, and one side of the column body is of an arc-shaped surface structure; a linear structure is formed on the other side; the parts, close to one end of the arc-shaped surface, of the two sides of the column body are formed into plane structures, and the parts close to the tip end are formed into concave curved surface structures; one side of the arc-shaped surface of the cylinder faces the liquid inlet pipe, and one side of the linear surface of the cylinder faces the liquid outlet pipe; the efficient liquid cooling device comprises the liquid cooling plate and the power module. According to the invention, a low-speed wake flow or vortex stagnant water area can be reduced, the heat dissipation efficiency of the liquid cooling plate is improved, and the flow resistance of the cooling liquid is reduced, so that the thermal reliability and thermal safety of the operation of the power module of the electronic equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation for automotive (components), and particularly to a liquid cooling plate with streamlined fin columns and an efficient heat dissipation device. Background Art

[0002] With the rapid development of new energy vehicles, as an important component of new energy vehicles, the motor controller (electric drive system) has an increasing power consumption. The traditional natural heat dissipation technology and air-cooled heat dissipation technology can no longer meet the heat dissipation requirements of the motor controller. Therefore, the liquid cooling heat dissipation technology has been widely used in the motor controller to solve the heat dissipation problem of the motor controller.

[0003] Currently, liquid cooling heat dissipation mainly dissipates heat from the motor controller (electric drive system) through a liquid cooling plate. However, the liquid cooling plates in the prior art generally have the following problems: the fin column structure of the liquid cooling flow channel will generate a low-speed wake region, and even a dead water region may appear, resulting in low heat dissipation efficiency of the liquid cooling plate, and the fin column structure has a large fluid flow resistance inside the liquid cooling plate. Due to the low heat dissipation efficiency of the liquid cooling plate, the junction temperature of the power devices in the motor controller may rise rapidly, which may lead to a decline in the performance of the power devices, and even failure or burnout, seriously affecting the thermal reliability and thermal safety of electronic devices. To solve the problem of large fluid flow resistance of the liquid cooling plate, currently, a pump with a larger power is mainly selected, but this will also cause problems such as higher product cost and larger power consumption.

[0004] Therefore, there is an urgent need to design a liquid cooling device with high heat dissipation efficiency and small flow resistance to solve the technical problems existing in the prior art. Summary of the Invention

[0005] Aiming at the above deficiencies existing in the prior art, the purpose of the present invention is to solve the problems of large coolant flow resistance and low heat dissipation efficiency of the existing liquid cooling plate, and provide a liquid cooling plate with streamlined fin columns and an efficient heat dissipation device, which can reduce the low-speed wake or eddy dead water region, improve the heat dissipation efficiency of the liquid cooling plate, reduce the flow resistance of the coolant, and thus improve the thermal reliability and thermal safety of the operation of the power module of the electronic device.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A liquid cooling plate with streamlined fin columns, comprising a liquid cooling plate body and a cover plate. One side of the liquid cooling plate body has a liquid guiding groove, and the cover plate is connected to the liquid cooling plate body and closes the liquid guiding groove. An inlet pipe is provided at one end of the liquid cooling plate body, and an outlet pipe is provided at the other end. A number of streamlined fin columns are provided at the bottom of the liquid guiding groove. It is characterized in that: the fin column includes a column body, one end of the cross-section of the column body is arc-shaped, so that one side of the column body is an arc-shaped surface structure; the other end is formed into a tip, so that the other side of the column body is formed into a straight-line structure; the parts of both sides of the column body close to the arc-shaped surface end are formed into plane structures, and the parts close to the tip are formed into concave curved surface structures. The tip side of the column body and the plane structures on both sides are transitioned through the curved surface structure; the arc-shaped surface side of the column body faces the direction of the inlet pipe, and the straight-line side faces the direction of the outlet pipe.

[0007] Further, the distance between the plane structures on both sides of the column body gradually decreases from the arc-shaped end to the tip, so that the two side surfaces of the column body are inclined surfaces.

[0008] Further, the arc-shaped end of the cross-section of the column body is circular arc-shaped or elliptical arc-shaped.

[0009] Further, the streamlined fin columns are spaced apart in several rows along the direction from the inlet pipe to the outlet pipe, and each row includes a plurality of streamlined fin columns spaced apart along the direction perpendicular to the direction from the inlet pipe to the outlet pipe.

[0010] Further, adjacent two rows of streamlined fin columns are staggeredly distributed.

[0011] Further, the radius of the circle where the arc-shaped end of the cross-section of the streamlined fin column is located is d, 0.8mm ≤ d ≤ 1.5mm, and the length of its cross-section is a, 2d ≤ a ≤ 5d; or, the minor axis diameter of the ellipse where the arc-shaped end of the cross-section of the streamlined fin column is located is b, the major axis radius is d, 1.6mm ≤ b ≤ 3mm, and 0.5b ≤ d ≤ b, and the length of its cross-section is a, 2d ≤ a ≤ 5d.

[0012] Further, the column pitch between adjacent two streamlined fin columns is s, 0.8mm ≤ s - b ≤ 1.5mm; the row pitch between adjacent two rows of the streamlined fin columns is c, 0 ≤ a - c ≤ d.

[0013] Further, the distance between the curved surface structure of the streamlined fin column and the arc-shaped surfaces of the adjacent two streamlined fin columns in the adjacent row is e, 0.5(s - b) ≤ e ≤ 0.7(s - b).

[0014] Furthermore, the depth of the guide groove is e, 4.32mm≤e≤6.6mm; the height of the streamlined fin column is h, 4mm≤h≤6mm; and there is a gap δ between the cover plate and the streamlined fin column, 0<δ≤0.4 (sb).

[0015] A high-efficiency liquid cooling device, characterized in that it includes the above-mentioned liquid cooling plate and a power module; the power module is installed on the side of the liquid cooling plate body away from the cover plate, and includes an IGBT module, a MOSFET module and a SiC module, and the power module is used to connect to a vehicle-mounted controller, an inverter or a converter.

[0016] Compared with the prior art, the present invention has the following advantages: 1. By arranging streamlined fin columns in the body of the liquid cooling plate, the low-speed wake area or dead water area after the coolant flows through the fin columns is reduced, the flow speed of the coolant around the fin columns is increased, and the convection heat transfer coefficient on the surface of the fin columns is increased; at the same time, the streamlined fin columns can increase the heat exchange area with the coolant, thereby improving the heat dissipation efficiency of the liquid cooling plate; and the pointed end of the fin column can reduce the flow resistance of the coolant, avoiding or minimizing the appearance of low-speed wake areas or dead water areas of the coolant.

[0017] 2. It can improve the heat dissipation efficiency of the heat dissipation device for vehicle-mounted controllers, inverters or converters, etc., to prevent the power module from rapidly rising in temperature due to difficulty in dissipating heat, thus affecting the normal operation of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention.

[0019] Figure 2 for Figure 1 A partial enlarged view of the .

[0020] Figure 3 It is a schematic diagram of the structure of the streamlined fin column.

[0021] Figure 4 Schematic diagram of the arrangement and dimensions of the streamlined fin structure on the liquid cooling plate body.

[0022] Figure 5 Coolant flow velocity distribution cloud diagram in the cooling channel, where (a) is the coolant flow velocity distribution around the streamlined fin column, and (b) is the coolant flow velocity distribution around the cylindrical fin column.

[0023] In the figure: 1—liquid cooling plate body, 2—cover plate, 3—liquid inlet pipe, 4—liquid outlet pipe, 5—column, 51—arc surface structure, 52—straight structure, 53—plane structure, 54—curved surface structure, 6—power module. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. 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 scope of protection of the present invention.

[0026] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined. In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; 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. 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.

[0027] Example: Refer to Figures 1 to 5, A liquid cooling plate with streamlined fin columns, comprising a liquid cooling plate body 1 and a cover plate 2. One side of the liquid cooling plate body 1 has a liquid guiding groove, and the cover plate 2 is connected to the liquid cooling plate body 1 and closes the liquid guiding groove. An inlet pipe 3 is provided at one end of the liquid cooling plate body 1, and an outlet pipe 4 is provided at the other end. A number of streamlined fin columns are provided at the bottom of the liquid guiding groove. During implementation, the liquid cooling plate body 1 and the streamlined fin columns are made of materials such as copper or aluminum alloy, and the heat conduction effect is better.

[0028] The fin column includes a column body 5. One end of the cross-section of the column body 5 is arc-shaped, so that one side of the column body 5 is an arc-shaped surface structure 51; the other end is formed into a tip, so that the other side of the column body 5 is formed into a straight-line structure 52. The parts of both sides of the column body 5 near the arc-shaped surface end are formed into a flat surface structure 53, and the parts near the tip are formed into a concave curved surface structure 54. The tip of the column body 5 (the straight-line structure 52) is connected to the flat surface structures 53 on both sides through the curved surface structure 54. During the processing process, the distance between the flat surface structures 53 on both sides of the column body 5 gradually decreases from the arc-shaped end to the tip, so that both sides of the column body 5 are inclined planes; this can improve the flow velocity of the coolant around the streamlined fin columns, avoid the occurrence of a dead water area of the coolant when the coolant flows through the fin columns, reduce the low-speed wake area, improve the heat dissipation efficiency of the liquid cooling plate, and at the same time reduce the flow resistance of the coolant.

[0029] The arc-shaped surface side of the column body 5 faces the direction of the inlet pipe 3, and the straight-line side faces the direction of the outlet pipe 4. This can effectively reduce the occurrence of a low-speed wake area or a dead water area after the coolant flows through the fin columns, and improve the flow velocity of the coolant around the fin columns; at the same time, the streamlined fin columns can increase the heat exchange area with the coolant, thereby improving the heat dissipation efficiency of the liquid cooling plate. Moreover, the pointed end of the fin column can reduce the flow resistance of the coolant, and avoid or reduce the occurrence of a low-speed wake area or a dead water area of the coolant. Among them, the streamlined fin columns are spaced in several rows along the direction from the inlet pipe 3 to the outlet pipe 4, and each row includes a plurality of streamlined fin columns spaced along the direction perpendicular to the direction from the inlet pipe 3 to the outlet pipe 4. To reduce the obstruction of the column body 5 to the coolant, adjacent rows of streamlined fin columns are staggeredly distributed. And this can improve the turbulent perturbation intensity of the coolant flowing around the streamlined fin columns, that is, increase the Reynolds number Re of the coolant flow, reduce the thickness of the coolant boundary layer on the surface of the streamlined fin columns, and enhance the convective heat transfer coefficient between the coolant and the surface of the streamlined fin columns, thereby improving the heat dissipation efficiency of the liquid cooling plate.

[0030] During actual processing, the arc-shaped end of the cross-section of the cylinder 5 is circular or elliptical arc-shaped. Among them, when the arc-shaped end of the cross-section of the cylinder 5 is circular, the radius of the circle where the arc-shaped end of the cross-section of the streamlined finned cylinder is located is d, 0.8 mm ≤ d ≤ 1.5 mm, and the length of its cross-section is a, 2d ≤ a ≤ 5d. When the arc-shaped end of the cross-section of the cylinder 5 is elliptical arc-shaped, the major axis length direction of the ellipse where the arc-shaped end of the cross-section of the streamlined finned cylinder is located is consistent with the direction from the tip to the arc-shaped end of the cross-section of the cylinder 5, and the minor axis length direction is perpendicular to the direction from the tip to the arc-shaped end of the cross-section of the cylinder 5. Among them, the minor axis diameter is b, the major axis radius is d, 1.6 mm ≤ b ≤ 3 mm, and 0.5b ≤ d ≤ b, and the length of its cross-section is a, 2d ≤ a ≤ 5d. The column spacing between two adjacent streamlined finned cylinders is s, 0.8 mm ≤ s - b ≤ 1.5 mm. This can meet the requirements of the coolant flow resistance loss and ensure the forced convection heat transfer performance of the liquid cooling plate; when the flow channel size between two adjacent rows of finned cylinders is too small, because the coolant flow channel is too narrow and the flow cross-sectional area is too small, resulting in too high a flow velocity, it will cause a significant increase in the flow resistance loss of the coolant in the liquid cooling plate; when the flow channel size between two adjacent rows of finned cylinders is too large, because the flow cross-sectional area of the coolant is too large, resulting in too low a flow velocity, it will cause a significant reduction in the heat dissipation efficiency of the liquid cooling plate.

[0031] The row spacing between two adjacent rows of the streamlined finned cylinders is c, 0 ≤ a - c ≤ d. The spacing between the curved surface structure 54 of the streamlined finned cylinder and the arc-shaped surfaces of two adjacent streamlined finned cylinders in the adjacent row is e, 0.5(s - b) ≤ e ≤ 0.7(s - b). This can meet the requirements of the coolant flow resistance loss, ensure the total heat transfer area of the streamlined finned cylinders provided on the liquid cooling plate body 1, and make the flow resistance loss of the coolant not too large when the coolant flows through the flow channel between the pointed ends and the arc-shaped ends of two adjacent streamlined finned cylinders, and at the same time the flow velocity of the coolant is not too small, so as to meet the requirements of the coolant flow resistance loss and the heat dissipation efficiency requirements of the liquid cooling plate.

[0032] During implementation, the depth of the diversion groove is e, 4.32 mm ≤ e ≤ 6.6 mm; the height of the streamlined finned cylinder is h, 4 mm ≤ h ≤ 6 mm; there is a gap δ between the cover plate 2 and the streamlined finned cylinder, 0 < δ ≤ 0.4(s - b). Thus, a better heat dissipation effect can be obtained. In this way, part of the coolant flows through the upper surface of the streamlined finned cylinder, and the upper surface of the finned cylinder can be used for convective heat transfer with the coolant, increasing the total heat transfer area between the liquid cooling plate and the coolant and improving the heat dissipation efficiency of the liquid cooling plate.

[0033] See Figure 1, this solution also discloses an efficient liquid cooling device, including the above-mentioned liquid cooling plate and a power module 6; the power module 6 is installed on the side of the liquid cooling plate body 1 facing away from the cover plate 2, and it includes an IGBT module, a MOSFET module, and a SiC module. This power module 6 is used to connect to a vehicle-mounted controller, an inverter, or a converter. By adopting this solution, the heat dissipation efficiency of the heat dissipation device for vehicle-mounted controllers, inverters, converters, etc. can be improved, and the normal operation of vehicle-mounted controllers, inverters, converters, etc. can be prevented from being affected by the difficulty of dissipating the heat inside the power module 6.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the present technical solution should be covered within the scope of the claims of the present invention.

Claims

1. A liquid cooling plate with streamlined fin columns, comprising a liquid cooling plate body and a cover plate, wherein one side of the liquid cooling plate body is provided with a liquid guide groove, the cover plate is connected to the liquid cooling plate body and closes the liquid guide groove; a liquid inlet pipe is provided at one end of the liquid cooling plate body, a liquid outlet pipe is provided at the other end, and a plurality of streamlined fin columns are provided at the bottom of the liquid guide groove; characterized in that: The wing column includes a column, one end of the cross section of the column is arc-shaped, so that one side of the column is an arc-shaped surface structure; the other end is formed into a tip, so that the other side of the column is formed into a straight structure; the parts of both sides of the column close to one end of the arc-shaped surface are formed into a plane structure, and the parts close to the tip are formed into a concave curved surface structure, and the tip side of the column transitions to the flat structures on both sides through the curved surface structure; the arc-shaped side of the column faces the direction of the liquid inlet pipe, and the straight side faces the direction of the liquid outlet pipe.

2. The liquid cooling plate with streamlined fin columns according to claim 1, characterized in that: The distance between the plane structures on both sides of the column gradually decreases from the arc end to the tip, so that the two side surfaces of the column are inclined surfaces.

3. The liquid cooling plate with streamlined fin columns according to claim 1, characterized in that: The arc-shaped end of the cross section of the column is in the shape of a circular arc or an elliptical arc.

4. The liquid cooling plate with streamlined fin columns according to claim 1, characterized in that: The streamlined fin columns are spaced apart in a plurality of rows along the direction from the liquid inlet pipe to the liquid outlet pipe, and each row includes a plurality of streamlined fin columns spaced apart in a direction perpendicular to the direction from the liquid inlet pipe to the liquid outlet pipe.

5. The liquid cooling plate with streamlined fin columns according to claim 4, characterized in that: Two adjacent rows of streamlined fins are staggered.

6. The liquid cooling plate with streamlined fin columns according to claim 5, characterized in that: The radius of the circle where the arc-shaped end of the cross section of the streamlined fin column is located is d, 0.8mm≤d≤1.5mm, and the length of its cross section is a, 2d≤a≤5d; or, the minor axis diameter of the ellipse where the arc-shaped end of the cross section of the streamlined fin column is located is b, the major axis radius is d, 1.6mm≤b≤3mm, and 0.5b≤d≤b, and the length of its cross section is a, 2d≤a≤5d.

7. The liquid cooling plate with streamlined fin columns according to claim 6, characterized in that: The column spacing between two adjacent streamlined fin columns is s, 0.8mm≤sb≤1.5mm; the row spacing between two adjacent rows of streamlined fin columns is c, 0≤ac≤d.

8. The liquid cooling plate with streamlined fin columns according to claim 7, characterized in that: The distance between the curved surface structure of the streamlined fin column and the arc-shaped surfaces of two adjacent streamlined fin columns in an adjacent row is e, 0.5 (sb) ≤ e ≤ 0.7 (sb).

9. The liquid cooling plate with streamlined fin columns according to claim 7, characterized in that: The depth of the guide groove is e, 4.32mm≤e≤6.6mm; the height of the streamlined fin column is h, 4mm≤h≤6mm; there is a gap δ between the cover plate and the streamlined fin column, 0<δ≤0.4 (sb).

10. A high-efficiency liquid cooling device, characterized in that: It comprises a liquid cooling plate as claimed in any one of claims 1 to 9 and a power module; the power module is installed on the side of the liquid cooling plate body away from the cover plate, and comprises an IGBT module, a MOSFET module and a SiC module, and the power module is used to connect to a vehicle-mounted controller, an inverter or a converter.

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