CN111540715A - An IGBT controller self-cooling radiator - Google Patents

Abstract

The invention discloses a self-cooling radiator for an IGBT controller, comprising a water-cooling plate, a condenser and a water-cooling pipe, the condenser is arranged above the water-cooling plate, the water-cooling plate is filled with cooling liquid, and the condenser The interior of the condenser is evacuated, a plurality of first cooling fins are installed on the upper surface of the condenser, and the two ends of the water-cooling pipe are respectively connected to the water-cooling plate and the condenser. The design is simple and scientific in structure, takes up little space, adopts the scheme of vacuuming inside the condenser, extrudes aluminum fins on the water-cooling plate to increase the heat dissipation area to allow natural convection with the air, and at the same time adds heat sinks on the surface of the condenser, using The cooling fan dissipates heat on the heat sink to achieve the effect of cooling the controller, which is suitable for popularization and application.

Description

An IGBT controller self-cooling radiator

technical field

The invention relates to the field of radiator structures, in particular to a self-cooling radiator for an IGBT controller.

Background technique

The heat dissipation performance of the insulated gate bipolar transistor (IGBT) of the motor controller has become an important factor affecting the safety, reliability and power of the motor and even the electric vehicle. Since the integration of motor controllers is getting smaller and smaller, the heat flux density is getting bigger and bigger. Therefore, the cooling of the motor controller is very important, which affects its use effect and life. At present, most of the controller radiators on the market use natural cooling, air cooling and water cooling. The natural cooling adopts the scheme that the radiator is close to the controller, and a layer of high thermal conductivity silicone grease is applied between the radiator and the controller to reduce contact heat. The controller transfers the heat to the radiator, the radiator transfers the temperature of the radiator substrate to the fins through thermal conduction, and the fins and the air carry out natural convection to take away the heat. The liquid-cooled radiator conducts the heat of the controller to the cooling liquid through the water-cooling plate, and cools the cooling liquid through the water pump or the chiller, so as to achieve the effect of circulating the cooling liquid. However, the heat dissipation efficiency of natural cooling is low, and the heat taken away is small; the water-cooled radiator needs an external circulating water pump or a chiller, although the heat dissipation effect is good, but it increases the power consumption, installation difficulty, maintenance difficulty, etc., and the integration degree is not high. , occupies a large area.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problems mentioned in the prior art, and now provides a self-cooling radiator for an IGBT controller.

The technical solution adopted by the present invention to solve the technical problem is as follows: an IGBT controller self-cooling radiator, comprising a water-cooling plate, a condenser and a water-cooling pipe, wherein the condenser is arranged above the water-cooling plate, and the water-cooling plate is arranged above the water-cooling plate. The inside is filled with cooling liquid, the inside of the condenser is evacuated, a number of first fins are installed on the upper surface of the condenser, and the two ends of the water-cooling pipe are respectively connected to the water-cooling plate and the condenser. Because the condenser evacuated inside is connected to the cooling channel of the water-cooled plate, the boiling point of the cooling liquid (water) is lowered, and the cooling liquid is easier to vaporize to take more heat to the condenser, and dissipate heat through the cooling fins of the condenser The heat is taken away, and the cooling liquid (water) flows back to the water-cooling plate to form a circulation after the condenser is dissipated and liquefied.

Further, a plurality of heat dissipation columns are formed on the upper surface of the condenser, each of the first heat dissipation fins is provided with mounting holes for matching the heat dissipation columns, and the first heat dissipation fins are installed at intervals from top to bottom. on the cooling column. Wherein, the first heat sink is in a wave shape to increase the contact area with the air; the first heat sink and the heat dissipation column adopt an interference fit, and the connection between the first heat sink and the heat dissipation column is painted There is thermal grease to reduce contact thermal resistance and increase thermal conductivity.

Further, a cooling fan is also included, and the cooling fan is mounted on the condenser through bolts and blows air to cool the first radiating fins.

Further, the water-cooled plate is composed of a water-cooled plate shell and a water-cooled plate bottom plate, the water-cooled plate shell is provided with a connection hole for connecting the igbt controller, and the water-cooled plate shell and the water-cooled plate bottom plate are welded by friction stir welding. , the bottom plate of the water-cooled plate is provided with a second heat sink, and the bottom plate of the water-cooled plate and the second heat sink are extruded integrally by an aluminum extrusion molding process, which reduces the number of welding times and reduces the welding thermal resistance; The bottom is welded on the second heat sink by brazing.

Further, the condenser is composed of a condenser shell and a condenser top plate, the condenser shell and the condenser top plate are welded by friction stir welding, and the heat dissipation column is welded on the condenser top plate by brazing.

The beneficial effects of the invention are as follows: the design structure is simple and scientific, adopts the scheme of vacuuming inside the condenser, extrudes aluminum fins on the water-cooling plate to increase the heat dissipation area to make it conduct natural convection with the air, and at the same time increases heat dissipation on the surface of the condenser The cooling fan is used to dissipate heat from the heat sink to achieve the effect of cooling the controller; at the same time, the heat sink, the water cooling plate and the condenser are integrated to reduce the occupied space.

Description of drawings

Fig. 1 is the structure exploded view of the present invention;

Fig. 2 is the structural perspective view of the present invention;

FIG. 3 is a schematic diagram of the structural connection between the first heat sink and the heat sink of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

As shown in Figures 1 to 3, an IGBT controller self-cooling radiator includes a water-cooled plate, a condenser and a water-cooled pipe 1. The water-cooled plate is composed of a water-cooled plate shell 9 and a water-cooled plate bottom plate 7. The water-cooled plate The board housing 9 is provided with a connection hole for connecting the igbt controller 8, and the igbt controller 8 is connected with the water-cooled board housing 9 by bolts; the contact between the two is smeared with high thermal conductivity silicone grease to reduce thermal resistance, and the water-cooled The plate shell 9 and the water-cooled plate bottom plate 7 are welded by friction stir welding; the condenser is composed of the condenser shell 6 and the condenser top plate 3, and the condenser shell 6 and the condenser top plate 3 are welded by friction stir welding; The condenser is arranged above the water-cooled plate, the water-cooled plate is filled with cooling liquid, the interior of the condenser is evacuated, and a number of cooling columns 2 are installed on the upper surface of the top plate 3 of the condenser. The heat dissipation column 2 is welded on the condenser top plate 3 by brazing, and a plurality of first heat dissipation fins 4 are installed on the heat dissipation column 2, and each of the first heat dissipation fins 4 is provided with a matching heat dissipation column. 2, the first heat sink 4 is installed on the heat sink 2 at intervals from top to bottom. Both ends of the water-cooling pipe 1 are respectively connected to the water-cooling plate and the condenser, and a cooling fan 5 for blowing and cooling the first radiating fins 4 is installed on the condenser. The first heat sink 4 is wave-shaped, the first heat sink 4 and the heat dissipation column 2 adopt an interference fit, and the connection between the first heat sink 4 and the heat dissipation column 2 is coated with heat conduction Silicone grease reduces contact thermal resistance and increases thermal conductivity. The bottom plate 7 of the water-cooled plate is provided with a second heat sink, and the bottom plate 7 of the water-cooled plate and the second heat sink are extruded integrally through an aluminum extrusion molding process, which reduces the number of welding times and reduces the thermal resistance of welding; the condenser The bottom of the casing 6 is welded to the second heat sink by brazing.

其中，_V为散热片附近流速，L为沿着流体运动方向，当L越小，对流换热系数越大，所以此处风扇固定在散热翅片长边处会产生更大的对流换热系数。Since the condenser evacuated inside is connected to the cooling channel of the water-cooled plate, the boiling point of the cooling liquid (water) is lowered. When the cooling liquid is water, the boiling point of water is 6.9696°C at 1000pa, and 17.495°C at 2000pa. At 101325pa, the boiling point is 100°C. When the inside of the flow channel is evacuated, the boiling point of water will decrease. The higher the vacuum degree, the lower the boiling point. When the controller heats up, the water absorbs heat and undergoes a phase change reaction to take away heat. This heat is the latent heat of evaporation of the working liquid. The water vapor will enter the condenser through the water cooling pipe. The cooling fan of the condenser and the first heat sink will reduce the temperature of the water vapor and instantly condense it into water and return to the water cooling plate, thus forming a cycle for the controller. To achieve the cooling effect, therefore, in the internal flow channel, only the inside of the water-cooled plate is filled with liquid water, which enters the condenser through the water-cooled pipe when the water is vaporized. At the same time, the second heat sink between the bottom plate of the water-cooling plate and the condenser shell will also take away a part of the heat. The fins of the second heat sink should ensure sufficient support strength and processing difficulty in terms of width. It is recommended that the height of the fins be / Thickness ≤ 8, fin gauge / fin height > 0.28 when the heat dissipation effect is the best. For top fins, the forced air convection heat transfer coefficient is

Among them, _V is the flow velocity near the heat sink, and L is the direction of fluid movement. When L is smaller, the convective heat transfer coefficient is larger, so here the fan is fixed at the long side of the heat dissipation fin, which will produce a larger convection heat transfer coefficient. .

The above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention are all It still falls within the scope covered by the patent of the present invention.

Claims (9)

1. An IGBT controller self-cooling radiator, characterized in that it comprises a water-cooling plate, a condenser and a water-cooling pipe, the condenser is arranged above the water-cooling plate, and the water-cooling plate is filled with cooling liquid, so the The interior of the condenser is evacuated, a plurality of first cooling fins are installed on the upper surface of the condenser, and the two ends of the water-cooling pipe are respectively connected to the water-cooling plate and the condenser. 2 . The self-cooling radiator of an IGBT controller according to claim 1 , wherein a plurality of radiating columns are formed on the upper surface of the condenser, and each of the first radiating fins is provided with a matching radiator. 3 . The mounting hole of the heat dissipation column, and the first heat dissipation fins are installed on the heat dissipation column from top to bottom at intervals. 3 . The IGBT controller self-cooling heat sink according to claim 1 or 2 , wherein the first heat sink is in a wave shape. 4 . The IGBT controller self-cooling heat sink according to claim 1 or 2, wherein the first heat sink and the heat sink adopt an interference fit, and the first heat sink and the Thermal grease is applied to the joints of the cooling columns. 5. The self-cooling radiator of an IGBT controller according to claim 1 or 2, further comprising a cooling fan, the cooling fan is mounted on the condenser and radiates heat to the first Sheet blast cooling. 6. The self-cooling radiator of an IGBT controller according to claim 1 or 2, wherein the water-cooled plate is composed of a water-cooled plate shell and a water-cooled plate bottom plate, and the water-cooled plate shell and the water-cooled plate bottom plate are composed of Friction stir welding is adopted, and the bottom plate of the water-cooled plate is provided with a second heat sink. 7 . The IGBT controller self-cooling radiator according to claim 6 , wherein the bottom plate of the water-cooling plate and the second heat sink are integrally extruded by an aluminum extrusion molding process. 8 . 8 . The IGBT controller self-cooling radiator according to claim 6 , wherein the bottom of the condenser is welded to the second heat sink by brazing. 9 . 9. The IGBT controller self-cooling radiator according to claim 2, wherein the condenser is composed of a condenser shell and a condenser top plate, and the condenser shell and the condenser top plate are stirred Friction welding, the heat dissipation column is welded to the top plate of the condenser by brazing.

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