Closed, finless cooling oil immersion cooling system

Abstract

A closed, finless, immersion cooling oil system comprises a first heat exchanger box, a second heat exchanger box, and a refrigeration unit, wherein the refrigerant line of the refrigeration unit extends into the second heat exchanger box and is immersed in the cooling oil, and the refrigeration unit circulates a refrigerant through the refrigerant line, so that the cooled refrigerant exchanges heat with the cooling oil in the second heat exchanger box via the refrigerant line, wherein the cooled cooling oil is introduced into the first heat exchanger box to perform a heat exchange with the heat-generating body to absorb the heat, wherein the cooling oil at an elevated temperature is returned to the second heat exchanger box to perform a heat exchange to lower the temperature, and this cycle continues.

Description

State of the art

[0001] Heat dissipation is a topic frequently addressed in the current age of Industry 4.0 and information technology. Every device or apparatus that performs mechanical work generates heat. If this heat cannot be effectively dissipated in a timely manner, it will, at the very least, impair operational efficiency and, at the very worst, lead to a work stoppage.

[0002] Wind turbines are typically located in areas with sufficient wind. The main shaft of a wind turbine's fan blades is connected to a generator via a gearbox. When the wind drives and rotates the fan blades, the gearbox causes the generator to rotate, producing electricity. During the conversion of wind energy into mechanical power and the subsequent conversion of mechanical power into electricity, a certain amount of mechanical energy is lost due to friction between the gearbox and other components, reducing the efficiency of wind power generation. To address this, the inventor previously provided Taiwanese patent 1800422, "Complete High-Speed ​​Magnetic Levitation Generator Set," which includes a main shaft housed within the casing.wherein the upper and lower ends of the main shaft are suspended by magnetic levitation supports, the main shaft is laterally supported by magnetic levitation bearings, the main shaft is further equipped with at least one turntable serving as the generator's rotor, several induction magnets are arranged along the circumference of the turntable, several coils serving as stators are fixedly arranged along the circumference of the main shaft in the housing and connected to a power transmission line, a transmission mechanism serving as an energy source is arranged at the upper end of the main shaft and connected to a fan unit or motor, and the main shaft is driven to rotate by the fan unit or motor, thereby driving the turntable to rotate and rotating the induction magnets relative to the coils to generate an induced current. The main shaft is supported by a complete magnetic levitation method.so that the lowest impedance is present when the main shaft rotates, in order to achieve high output power.

[0003] The complete magnetic levitation wind turbine is a green energy device with higher power generation efficiency. However, the generator still suffers from coil heating during operation. To solve this problem, several cooling fins are typically attached to the generator housing.

[0004] The cooling fins serve to increase the heat absorption and heat dissipation area of ​​the housing. Combined with air cooling, this allows for heat dissipation. However, this heat dissipation method using cooling fins in combination with air cooling is becoming increasingly unsuitable for high-performance devices.

[0005] In an era of rapidly improving AI computing power, higher-quality, high-end chips generate more heat during operation. Conventional cooling and heat dissipation methods can no longer meet these demands, leading to a recent boom in liquid cooling technology. Traditional liquid cooling technology relies on immersing heat-generating elements in a non-conductive coolant within a container, with a chiller positioned above the coolant. As the heat-generating elements produce heat, the low-boiling-point coolant evaporates. The vapor produced during evaporation condenses into liquid through a condenser tube and then falls to the bottom, repeating this cycle. Object of the invention

[0006] The main objective of the present invention is to provide a cooling system that does not require cooling fins and provides a more efficient heat dissipation effect.

[0007] The technical means of the closed, finless cooling oil immersion cooling system according to the invention comprise the following: a first heat exchanger box, which serves to hold a heat-generating body and is provided with a first cooling oil inlet and a first cooling oil outlet; a second heat exchanger box, which serves to hold a cooling oil and is provided with a second cooling oil inlet and a second cooling oil outlet, wherein the second cooling oil inlet and the first cooling oil outlet are connected to each other via a first pipe, the second cooling oil outlet and the first cooling oil inlet are connected to each other via a second pipe, and the second pipe is provided with a pump; and a refrigeration machine, which is connected to a refrigerant line, wherein the refrigerant line extends into the second heat exchanger box and is immersed in the cooling oil;wherein the refrigeration machine circulates a refrigerant through the refrigerant line, so that the cooled refrigerant exchanges heat via the refrigerant line with the cooling oil located in the second heat exchanger box, wherein the cooled cooling oil is drawn off by the pump and introduced via the second pipe into the first heat exchanger box to carry out a heat exchange with the heat-generating body in order to absorb the heat, wherein the cooling oil at an increased temperature is returned via the first pipe to the second heat exchanger box to carry out a heat exchange to lower the temperature, wherein this cycle continues.

[0008] Preferably, the cooling oil is a non-conductive coolant. This allows the coils of a generator and the circuit boards on which electronic components and circuits are arranged to be immersed without damage.

[0009] In one embodiment of the present invention, the first heat exchanger box can be cylindrical, with the axis of the first cooling oil inlet running along the tangential direction of the arcuate side wall, such that when the cooling oil flows into the first heat exchanger box, it can flow along the cylindrical circumference to completely absorb the heat generated by the heat-generating body. The cooling oil then flows back to the second heat exchanger box.

[0010] In one embodiment of the present invention, the first cooling oil outlet can be designed such that its axis is perpendicular to the direction of the arc-shaped side wall. In this way, the cooling oil can flow out with a slight delay along the cylindrical circumference of the first heat exchanger box in order to fully absorb the heat generated by the heat-generating body.

[0011] In one embodiment of the present invention, a main shaft hole can be provided in the cylindrical central region of the first heat exchanger box. In this way, the first heat exchanger box can be used to house the generator of the magnetic levitation wind turbine, wherein the coils of the generator are completely immersed in the cooling oil located in the first heat exchanger box and the main shaft of the generator can pass through the main shaft hole.

[0012] In one embodiment of the present invention, the first heat exchanger box can be rectangular and serve to accommodate the circuit boards equipped with chips.

[0013] The cooling system of the present invention offers the advantages that no oil or gas escapes and the cooling oil provides a better cooling effect in the internal circuit. Brief description of the drawings Fig. Figure 1 shows a schematic top view of the cooling system according to the invention; Fig. Figure 2 shows a cross-sectional view of the cylindrical structure of the first heat exchanger box along section line II-II; Fig. Figure 3 shows a schematic top view according to an embodiment of the present invention, in which the cylindrical first heat exchanger box is housed in a magnetic levitation wind turbine; Fig. Figure 4 shows a schematic top view according to an embodiment of the present invention, in which the circuit boards are immersed in the rectangular first heat exchanger box. Detailed description of preferred embodiments

[0014] It will be on Fig. 1 Reference is made to the invention. The closed, finless cooling oil immersion cooling system according to the invention comprises a first heat exchanger box 1, a second heat exchanger box 2 and a refrigeration machine 3, wherein the first heat exchanger box 1 has an interior 13 for receiving a heat-generating body and is provided with a first cooling oil inlet 11 and a first cooling oil outlet 12, wherein the second heat exchanger box 2 serves for receiving a cooling oil 5 and is provided with a second cooling oil inlet 21 and a second cooling oil outlet 22, wherein the second cooling oil inlet 21 and the first cooling oil outlet 12 are connected to each other via a first pipe 23, the second cooling oil outlet 22 and the first cooling oil inlet 11 are connected to each other via a second pipe 24 and the second pipe 24 is provided with a pump 4.wherein the refrigeration unit 3 is arranged outside the second heat exchanger box 2 and is connected to a refrigerant line 31, the refrigerant line 31 extending into the second heat exchanger box 2 and immersed in the cooling oil 5. More precisely, a low-temperature refrigerant flows through the refrigeration unit 31 immersed in the cooling oil 5 and thus circulates continuously.

[0015] In a preferred embodiment of the present invention, the cooling oil 5 is a non-conductive cooling oil.

[0016] In the cooling system according to the invention, a suitable shape is selected for the first heat exchanger box 1 depending on the intended use. For example, the first heat exchanger box 1 can have a cylindrical shape when used for magnetic levitation wind turbines (as in Fig. 2 shown), the first cooling oil inlet 11 is provided with an axis along the tangential direction of the arcuate side wall, the first cooling oil outlet 12 is provided with an axis perpendicular to the arcuate side wall and the main shaft hole 14 is provided in the cylindrical central area.

[0017] It will be on Fig. 3. Reference is made to the magnetic levitation wind turbine. In the housing, a lower magnetic levitation support 71A is arranged on the lower surface of the interior and an upper magnetic levitation support 71B on the upper surface of the interior. A first magnetic levitation bearing 72A and a second magnetic levitation bearing 72B are arranged in the interior along the vertical direction. A main shaft S is arranged perpendicular to the first and second magnetic levitation bearings 72A and 72B, respectively, with the upper and lower ends of the main shaft S being connected to the upper magnetic levitation support 71B and the lower magnetic levitation support 71A, respectively. The upper end of the main shaft S extends outwards from the housing and is then connected to the fan blades via a transmission mechanism such as a gear.A generator 6 is mounted on the main shaft S located between the first magnetic levitation bearing 72A and the second magnetic levitation bearing 72A, the generator 6 comprising several coils 63 serving as stator and a first turntable 61A and a second turntable 61B serving as rotor, the coils 63 being fixedly arranged in the housing along the circumference of the main shaft S and connected to a power transmission line, and the first turntable 61A and the second turntable 61B being attached to the main shaft S and each being provided with several first induction magnets 62A and second induction magnets 62B arranged along their circumference, an induced current being generated and output via the power transmission line when the first induction magnets 62A and the second induction magnets 62B are rotated relative to the coils 63.When the fan blades rotate, the main shaft S is set in motion by driving the transmission mechanism, which in turn drives the first and second turntables 61A, 61B of the generator 6 to rotate in order to generate electricity.

[0018] In the cooling system according to the invention, the first heat exchanger box 1 serves to hermetically house the generator 6. When the first heat exchanger box 1 is filled with cooling oil 5, the coils 63 of the generator 6 are completely immersed in the cooling oil 5 located in the first heat exchanger box 1.

[0019] The coils 63 generate heat through the operation of the generator 6. After the cooling system according to the invention is started, the refrigerant circulates through the refrigerant line 31 due to the operation of the refrigeration machine 3, so that the cooled refrigerant exchanges heat with the cooling oil 5 located in the second heat exchanger box 2 via the refrigerant line 31. The cooled cooling oil 5 is drawn off by the pump 4 and introduced into the first heat exchanger box 1 via the second pipe 24 to perform a heat exchange with the generator 6 in order to absorb the heat. The cooling oil 5, whose temperature has increased in the first heat exchanger box 1, is returned to the second heat exchanger box 2 via the first pipe 23 and then exchanges heat in the refrigerant line 31 to lower the temperature.After cooling, the cooling oil 5 is introduced into the first heat exchanger box 1 to perform a heat exchange with the generator 6, and this cycle continues. In this way, the heat from the generator can be effectively reduced without the need for air cooling using cooling fins.

[0020] It will be on Fig.4. When operating high-end chips, which generate large amounts of heat, the conventional heat dissipation method achieved through air cooling can no longer meet the requirements. Therefore, several printed circuit boards 8, each equipped with chips 81, can be inserted into the rectangular first heat exchanger box 1A. The power cable on the printed circuit boards 8 is connected to the first heat exchanger box 1A, and the printed circuit boards are electrically connected to an external controller 9 to control the operation of the circuit. Subsequently, non-conductive cooling oil 5 is filled into the first heat exchanger box 1A and the second heat exchanger box 2, thus immersing the printed circuit boards 8, equipped with chips 81, in the cooling oil 5 located in the first heat exchanger box 1A.After the refrigeration unit 3 is started, the refrigerant circulates through the refrigerant line 31, so that the cooled refrigerant exchanges heat with the cooling oil 5 located in the second heat exchanger box 2 via the refrigerant line 31. The cooled cooling oil 5 is drawn off by the pump 4 and introduced via the second pipe 24 into the first heat exchanger box 1 to absorb heat by exchanging heat with the chips 81 of the circuit boards 8 or other heat-generating elements. The cooling oil 5, whose temperature has increased in the first heat exchanger box 1, is returned to the second heat exchanger box 2 via the first pipe 23 and then exchanges heat in the refrigerant line 31 to lower its temperature. After cooling, the cooling oil 5 is introduced into the first heat exchanger box 1 to exchanging heat with the chips 81 and other heat-generating elements, and this cycle continues.

[0021] With the cooling system according to the invention, a cooling oil can flow in a sealed environment and circulate in the first heat exchanger box 1, 1A and in the second heat exchanger box 2. The present invention thus has the advantages that no oil or gas escapes and the cooling oil offers a better cooling effect in the internal circuit.

Claims

[1] A closed, finless cooling oil immersion cooling system, comprising: a first heat exchanger box (1) which serves to accommodate a heat-generating body and is provided with a first cooling oil inlet (11) and a first cooling oil outlet (12); a second heat exchanger box (2) which serves to hold a cooling oil (5) and is provided with a second cooling oil inlet (21) and a second cooling oil outlet (22), wherein the second cooling oil inlet (21) and the first cooling oil outlet (12) are connected to each other via a first pipe (23), the second cooling oil outlet (22) and the first cooling oil inlet (11) are connected to each other via a second pipe and the second pipe (24) is provided with a pump (4); and a refrigeration machine (3) connected to a refrigerant line (31), wherein the refrigerant line (31) extends into the second heat exchanger box (2) and is immersed in the cooling oil (5); wherein the refrigeration machine (3) circulates a refrigerant through the refrigerant line (31) so that the cooled refrigerant exchanges heat via the refrigerant line (31) with the cooling oil (5) located in the second heat exchanger box (2), wherein the cooled cooling oil (5) is drawn off by the pump (4) and introduced via the second pipe (24) into the first heat exchanger box (1) to carry out heat exchange with the heat-generating body to absorb the heat, wherein the cooling oil (5) at an increased temperature is returned via the first pipe (23) to the second heat exchanger box (2) to carry out heat exchange to lower the temperature, wherein this cycle continues, wherein a main shaft hole (14) is provided in the cylindrical central region, characterized by, that the first heat exchanger box (1) serves to accommodate the generator (6) of a magnetic levitation wind power plant, wherein the coils (63) of the generator (6) are completely immersed in the cooling oil (5) located in the first heat exchanger box (1) and the main shaft (S) of the generator (6) is passed through the main shaft hole (14). [2] Closed, finless cooling oil immersion cooling system according to claim 1, wherein the cooling oil (5) is a non-conductive coolant. [3] Closed, fin-free cooling oil immersion cooling system according to claim 2, wherein the first heat exchanger box (1) is cylindrical, the axis of the first cooling oil inlet (12) running along the tangential direction of the arc-shaped side wall. [4] Closed, fin-free cooling oil immersion cooling system according to claim 3, wherein the first cooling oil outlet (12) is designed such that its axis is perpendicular to the direction of the arc-shaped side wall.

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