A heat pipe assisted cooling system for high temperature molten salt pump bearing cooling

Abstract

The present invention relates to a high-temperature molten salt pump, and in particular to a heat pipe-assisted heat dissipation system for cooling the bearings on a high-temperature molten salt pump. It includes a bearing box, a heat exchange system and an air cooling system. The heat exchange system is composed of main heat dissipation ribs, U-shaped heat pipes, and umbrella-shaped heat dissipation ribs by welding; the air cooling system includes an upper wind wheel, a lower wind wheel, a cover tube, a spiral guide vane, and a continuous spiral groove. The bearing box is equipped with a bearing, and the outer wall of the bearing box is provided with a main heat dissipation rib. The main heat dissipation ribs are vertically opened to install a pair of U-shaped heat pipes, and umbrella-shaped heat dissipation ribs are evenly arranged around the condensation end; an upper wind wheel is arranged at the upper end of the pump shaft, and a lower wind wheel is arranged at the lower end; a spiral guide vane is arranged on the inner wall of the cover tube to form a continuous spiral groove; an air hole is opened on the motor seat, and the air flow can be discharged from it, and further discharged from the system through the lower wind wheel. The present invention utilizes heat pipes to assist the fins in heat dissipation, and adds spiral guide vanes to cooperate with the cover tube to form a controllable air duct, so that the heat inside the system is discharged, thereby ensuring the service life of the bearing.

Description

Technical Field

[0001] The invention relates to a high-temperature molten salt pump, and in particular to a heat pipe assisted heat dissipation system for cooling bearings on a high-temperature molten salt pump. Background Art

[0002] The high-temperature molten salt pump is a pump used to transport high-temperature metal salts. It is mainly used for the transportation of high-temperature nitrates, nitrites, etc. It is also widely used in alumina, aluminum hydroxide and organic chemical processes. Since the temperature of the medium transported by the high-temperature molten salt pump is usually 400°C or above, the working life of the bearing will be greatly reduced at this temperature, and thus reduce the overall life of the high-temperature molten salt pump. Research on how to increase the life of the bearing on the molten salt pump in this high-temperature environment has become one of the main problems. Since optimizing the bearing cooling system has a significant gain in increasing the service life of the bearing, considering the engineering application value and market demand, a high-temperature molten salt pump bearing cooling system with good heat dissipation, reasonable structure and space intensiveness is proposed.

[0003] Both fins and heat pipes are devices with good heat transfer performance. Fins are often used in heat exchange equipment. They have many advantages such as reducing the thermal resistance of convective heat transfer, increasing the heat transfer area, and enhancing the heat transfer capacity of the equipment. However, the heat transfer efficiency of ordinary fins is low, and the use of a single fin for heat dissipation has average effect. Heat pipes are special devices with rapid temperature equalization characteristics. Due to their light weight and excellent thermal superconductivity, they are widely used in various heat exchangers. The thermal conductivity of heat pipes exceeds that of any known metal. The use of heat pipes to assist fin heat dissipation can greatly improve the overall heat exchange efficiency of the equipment.

[0004] At present, patents have been proposed for cooling devices for molten salt pumps. Utility model CN201821125040.9 proposes a molten salt pump air cooling mechanism, which has a simple structure, is not limited by geographical location, and has low cost of use. However, this mechanism mainly optimizes the air duct structure, and the overall heat dissipation capacity still has room for improvement; utility model CN201721091310.4 proposes a molten salt pump cooling device, which combines air cooling and water cooling for heat dissipation, and has a significant cooling effect, but requires the installation of a large cooling water tank, the equipment is heavy, and the space intensive effect is not achieved. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a heat pipe assisted heat dissipation system for bearing cooling on a high-temperature molten salt pump, which adopts fin heat dissipation as the main method and heat pipe heat transfer as the auxiliary method, and the wind wheel provides power to drive air turbulence to force heat exchange to enhance the overall heat dissipation effect of the system; umbrella-shaped heat dissipation ribs are provided at the condensation end of the heat pipe to enhance its condensation effect, and spiral guide vanes are provided on the inner wall of the cover tube to achieve sufficient heat exchange.

[0006] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is as follows:

[0007] A heat pipe assisted heat dissipation system for cooling bearings on a high-temperature molten salt pump comprises a bearing box, a heat exchange system and an air cooling system, wherein the heat exchange system is formed by connecting main heat dissipation ribs, U-shaped heat pipes and umbrella-shaped heat dissipation ribs by welding; the air cooling system comprises an upper wind wheel, a lower wind wheel, a cover tube, a spiral guide vane and a continuous spiral groove; a central hole is provided on the top of the bearing box to cooperate with the pump shaft, a bearing is installed inside the bearing box, main heat dissipation ribs are welded on the outer wall of the bearing box, and the main heat dissipation ribs are vertically opened to install paired U-shaped heat pipes, and the evaporation ends and condensation ends of the two paired U-shaped heat pipes are arranged oppositely and fitted, and umbrella-shaped heat dissipation ribs are evenly arranged around the condensation end, and the outer side of the bearing box is provided with parallel heat dissipation ribs on the motor seat. The cover cylinder is fitted with the surface; the cover cylinder is used for heat insulation, and its inner wall is provided with a spiral guide plate with an inclination angle of 4°-6° to the horizontal direction to form a continuous spiral groove; the top end of the pump shaft extends out of the cover cylinder, the upper wind wheel is arranged at the upper end of the pump shaft and is located inside the cover cylinder, the middle end of the pump shaft is installed in the bearing box and is transitionally matched with the center hole, the bearing and the middle end of the pump shaft are in a base hole system, the lower end of the pump shaft is installed in the center hole on the upper surface of the motor base and is transitionally matched with it, the lower wind wheel is arranged at the lower end of the pump shaft and is located inside the motor base; the upper surface of the motor base is provided with an air hole, and is connected with the internal space formed by the cover cylinder and the bearing box; the pump shaft uses its own rotation to drive the upper wind wheel and the lower wind wheel to rotate, no external power supply is required, and the air cooling system is stable and reliable.

[0008] The main heat dissipation fins are evenly distributed in an umbrella shape and have an inclination of 25°-35° with the horizontal direction;

[0009] The part of the U-shaped heat pipe that contacts the main heat dissipation fins is the evaporation end, which accounts for 1 / 3 of the total length; the part connected to the evaporation end is the middle end, which accounts for 1 / 3 of the total length; the condensation end is the remaining 1 / 3; the umbrella-shaped heat dissipation fins are evenly distributed at the condensation end and are inclined at 10°-20° to the horizontal direction;

[0010] The U-shaped heat pipe is made of copper pipe and the internal heat exchange medium is water.

[0011] The U-shaped heat pipe can be replaced by a gravity heat pipe.

[0012] Beneficial effects of the present invention:

[0013] 1) By innovatively designing the main heat dissipation fins into an umbrella shape, the heat dissipation performance can be greatly improved at an appropriate inclination angle, thereby achieving rapid cooling of the bearing box and controlling the internal bearing temperature within a reasonable range. 2) The rapid temperature equalization characteristics of the heat pipe are used to assist the main heat dissipation fins in heat dissipation, and most of the heat on the main heat dissipation fins is quickly transferred from the evaporation end to the condensation end, thereby improving the heat exchange efficiency.

[0014] 3) By setting umbrella-shaped heat dissipation fins at the condensation end of the heat pipe, the heat transfer area of ​​the condensation end can be increased; at the same time, at an appropriate inclination angle, the continuous development of the boundary layer can be interrupted and its turbulence degree can be increased, thereby quickly transferring heat from the condensation end to the air.

[0015] 4) The air cooling system can quickly transfer the heat in the internal air to the outside, thereby keeping the system temperature within a reasonable and controllable range; at the same time, the setting of the hood also makes the air flow controllable. Under the guidance of the spiral guide vane, the air can spiral downward along the inner wall of the hood, solving the problem of waste heat accumulation between the main heat dissipation fins and the umbrella-shaped heat dissipation fins, and achieving sufficient heat exchange.

[0016] 5) Copper tubes are used as the heat pipe material, and water is used as the internal heat exchange medium. The rotation of the pump shaft is used to drive the upper and lower wind wheels to rotate. No external power supply is required, which improves the reliability of the air cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention and a schematic diagram of the cold air flow path.

[0018] Figure 2 It is a top view schematic diagram of the heat pipe position distribution of the present invention.

[0019] Figure 3 It is a schematic diagram of the assembly of the bearing box, main heat dissipation fins and U-shaped heat pipes of the present invention.

[0020] Figure 4 It is a schematic diagram of the assembly of the bearing box, main heat dissipation fins and gravity heat pipes of the present invention.

[0021] Figure 5 It is a schematic diagram of assembling the U-shaped heat pipe and the umbrella-shaped heat dissipation fins of the present invention.

[0022] Figure 6 It is a schematic diagram of assembling the gravity heat pipe and the umbrella-shaped heat dissipation fins of the present invention.

[0023] Figure 7 This is a top view of the motor base of the present invention.

[0024] Figure 8 It is a schematic diagram of the pump shaft structure of the present invention.

[0025] In the figure: 1. upper wind wheel; 2. spiral guide vane; 3. continuous spiral groove; 4. main heat dissipation rib; 5. U-shaped heat pipe; 6. umbrella-shaped heat dissipation rib; 7. motor base; 8. cover cylinder; 9. bearing box; 10. bearing; 11. pump shaft; 12. air hole; 13. lower wind wheel; 14. cold air flow path of upper wind wheel; 15. cold air flow path in the continuous spiral groove; 16. air path from the end of heat transfer to the lower wind wheel; 17. air path for outflow of lower wind wheel; 18. gravity heat pipe; 19. top end of pump shaft; 20. upper end of pump shaft; 21. middle end of pump shaft; 22. lower end of pump shaft. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not limited to the present invention.

[0027] like Figure 1 As shown: a heat pipe assisted heat dissipation system for cooling the bearing on a high-temperature molten salt pump, comprising a bearing box 9, a heat exchange system and an air cooling system, wherein the heat exchange system is formed by welding the main heat dissipation fins 4, the U-shaped heat pipes 5, and the umbrella-shaped heat dissipation fins 6; the air cooling system comprises an upper wind wheel 1, a lower wind wheel 13, a cover tube 8, a spiral guide vane 2, and a continuous spiral groove 3. The bearing box 9 is provided with a pump shaft 11 inside, and a bearing 10 is installed on the pump shaft 11. The main heat dissipation fins 4 are welded on the outer wall of the bearing box 9, and the main heat dissipation fins 4 are vertically opened to install a pair of U-shaped heat pipes 5, and their two evaporation ends and condensation ends are both fitted, and umbrella-shaped heat dissipation fins 6 are arranged around the condensation end; the upper surface of the motor seat 7 is provided with air holes 12 and a cover tube 8 containing the bearing box 9, the tube 8 is used for heat insulation, and the inner wall is provided with a spiral guide vane 2 with an inclination angle of 4°-6° to the horizontal direction, forming a continuous spiral groove 3. When the heat exchange system is working, the bearing box 9 transfers most of the heat to the main heat dissipation fins 4, part of the heat is dissipated into the air through the main heat dissipation fins 4, and most of the heat is transferred to the condensation end through the evaporation end by the paired U-shaped heat pipes 5. The umbrella-shaped heat dissipation fins 6 evenly distributed at the condensation end quickly dissipate the heat into the air, thereby realizing efficient heat transfer; when the air cooling system is working, under the action of the upper wind wheel 1, the cold air flow enters the system vertically downward from the upper end of the cover tube 8, see the upper wind wheel cold air flow path 14, under the guidance of the spiral guide vane 2 and the cover tube 8, most of the heat is dissipated into the air. The cold air flow moves slowly downward along the continuous spiral groove 3, see the cold air flow path 15 in the continuous spiral groove; this part of the cold air flow moves slowly downward along the continuous spiral groove, takes away the residual heat of the main heat dissipation ribs 4 and the umbrella-shaped heat dissipation ribs 6, and enhances the heat exchange capacity; the remaining cold air flow moves vertically downward to blow out the internal residual heat, optimizes the heat dissipation effect, see the end of heat transfer to the lower wind wheel air path 16; discharged to the lower wind wheel 13 through the upper air hole 12 of the motor base 7, and further discharged to the outside, see the lower wind wheel outflow air path 17; the cold air flow can be Figure 1Path shown is circulated.

[0028] like Figure 2 As shown, the outer wall of the bearing box 9 is annularly distributed with main heat dissipation fins 4, and 14 to 18 pairs of U-shaped heat pipes 5 are evenly distributed along the circumferential direction on the main heat dissipation fins 4. The specific number can be determined according to the outer diameter of the bearing box 9.

[0029] like Figure 3 As shown, 6 to 8 layers of main heat dissipation fins 4 are evenly distributed from top to bottom on the outer wall of the bearing box 9, and the specific number can be determined according to the height of the bearing box 9 and the position of the oil pipeline opening. When the heat exchange system is working, the bearing box 9 transfers heat to the main heat dissipation fins 4 on its outer wall, part of the heat is directly dissipated into the air, and most of the heat is absorbed by the evaporation end of the U-shaped heat pipe 5 and quickly transferred to the condensation end. The umbrella-shaped heat dissipation fins 6 distributed around the condensation end further dissipate the heat into the air, thereby achieving efficient heat dissipation.

[0030] like Figure 4 As shown, the U-shaped heat pipe 5 can be replaced with a gravity heat pipe 18. In this case, not only does the system occupy less space, but the main heat sink fins 4 and the umbrella-shaped heat sink fins 6 are staggered, and the heat dissipation performance can be further improved. The gravity heat pipe 18 is connected to the main heat sink fins 4 by welding. The number of gravity heat pipes 18 is half of that of the U-shaped heat pipes 5. The evaporation end of the gravity heat pipe 18 is welded to the main heat sink fins 4. The gravity heat pipe 18 is made of copper tube, and the internal heat exchange medium is water. The condensation end is at the top and the evaporation end is at the bottom. The coolant reflux is achieved by gravity, which is more economical and efficient. When the heat exchange system is working, its working principle is basically the same as that of the U-shaped heat pipe 5.

[0031] like Figure 5 As shown, the U-shaped heat pipe 5 and the umbrella-shaped heat dissipation fins 6 are integrally cast, and five umbrella-shaped heat dissipation fins 6 in the same direction are evenly distributed from top to bottom at the condensing end of each U-shaped heat pipe 5, and the outer diameter of the umbrella-shaped annular fins 6 is three times the diameter of the U-shaped heat pipe 5.

[0032] like Figure 6 As shown, the gravity heat pipe 18 and the umbrella-shaped heat dissipation fins 6 are integrally cast, and 8 umbrella-shaped heat dissipation fins 6 in the same direction are evenly distributed from top to bottom at the condensation end of the gravity heat pipe 18. The outer diameter of the umbrella-shaped annular fins 6 is three times the diameter of the gravity heat pipe 18.

[0033] like Figure 7 As shown, the motor base 7 is provided with a circular array of air holes 12 , and the number and positions of the air holes 12 correspond to the U-shaped heat pipe 5 .

[0034] like Figure 8 As shown, the pump shaft 11 can be divided into four parts, namely a pump shaft top end 19, a pump shaft upper end 20, a pump shaft middle end 21, and a pump shaft lower end 22.

[0035] Further explain below in conjunction with the working process of the present invention:

[0036] When the system is working, the heat exchange system and the air cooling system operate simultaneously. For the heat exchange system, the bearing box 9 transfers heat to the main heat dissipation fins 4, part of the heat is dissipated into the air through the main heat dissipation fins 4, and most of the heat is transferred to the condensation end through the paired U-shaped heat pipes 5 through the evaporation end. The umbrella-shaped heat dissipation fins 6 evenly distributed at the condensation end quickly dissipate the heat into the air, realizing efficient heat transfer; for the air cooling system, no external power supply is required, the pump shaft 11 rotates automatically to drive the upper wind wheel 1 and the lower wind wheel 13 thereon to rotate, and the cold air flow above the device enters the system under the drive of the upper wind wheel 1, and part of the air flow slowly moves downward along the continuous spiral groove 3, taking away a large amount of residual heat accumulated in the main heat dissipation fins 4 and the umbrella-shaped heat dissipation fins 6, and the other part of the air flow moves vertically downward, taking away the heat in the air inside the system, and the two air flows converge at the air hole 12, and leave the system under the drive of the lower wind wheel 13 and are discharged to the outside. The heat exchange system and the air cooling system work together to continuously and efficiently dissipate and discharge the heat inside the entire system.

[0037] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A heat pipe assisted cooling system for high temperature molten salt pump bearing cooling, characterized in that: The system includes a bearing box, a heat exchange system and an air cooling system. The heat exchange system is formed by connecting main heat dissipation ribs, U-shaped heat pipes and umbrella-shaped heat dissipation ribs by welding; the air cooling system includes an upper wind wheel, a lower wind wheel, a cover tube, a spiral guide vane and a continuous spiral groove; a central hole is provided on the top of the bearing box to cooperate with the pump shaft, a bearing is installed inside the bearing box, the main heat dissipation ribs are welded on the outer wall of the bearing box, and the main heat dissipation ribs are vertically opened to install paired U-shaped heat pipes, and the evaporation ends and condensation ends of the two paired U-shaped heat pipes are arranged oppositely and fitted, umbrella-shaped heat dissipation ribs are evenly arranged around the condensation end, and the outer side of the bearing box is provided with heat dissipation ribs that are compatible with the electric A cover cylinder is fitted on the upper surface of the machine base; the cover cylinder is used for heat insulation, and its inner wall is provided with spiral guide plates to form continuous spiral grooves; the top end of the pump shaft extends out of the cover cylinder, the upper wind wheel is arranged on the upper end of the pump shaft and is located inside the cover cylinder, the middle end of the pump shaft is installed in the bearing box and is transitionally matched with the center hole of the bearing box, the bearing and the middle end of the pump shaft are in a base hole system, the lower end of the pump shaft is installed in the center hole on the upper surface of the motor base and is transitionally matched with it, the lower wind wheel is arranged on the lower end of the pump shaft and is located inside the motor base; the upper surface of the motor base is provided with air holes, which are connected with the internal space formed by the cover cylinder and the bearing box; the pump shaft drives the upper wind wheel and the lower wind wheel to rotate by its own rotation; The main heat dissipation fins are evenly distributed in an umbrella shape and have an inclination of 25°-35° with the horizontal direction; The spiral guide vane has an inclination angle of 4°-6° with respect to the horizontal direction; When the system is working, the heat exchange system and the air cooling system operate simultaneously. For the heat exchange system, the bearing box transfers heat to the main heat dissipation ribs, part of the heat is dissipated into the air through the main heat dissipation ribs, and most of the heat is transferred to the condensation end through the evaporation end by paired U-shaped heat pipes. The umbrella-shaped heat dissipation ribs evenly distributed at the condensation end quickly dissipate the heat into the air, thereby realizing efficient heat transfer; for the air cooling system, the pump shaft rotates by itself to drive the upper and lower wind wheels thereon to rotate, and the cold air flow above the device enters the system driven by the upper wind wheel. Part of the air flow slowly spirals downward along the continuous spiral groove, taking away a large amount of waste heat accumulated in the main heat dissipation ribs and the umbrella-shaped heat dissipation ribs, and the other part of the air flow moves vertically downward, taking away the heat in the air inside the system, and the two air flows converge at the wind hole, leaving the system driven by the lower wind wheel and discharged to the outside; the heat exchange system and the air cooling system work together to enable the heat inside the entire system to be continuously and efficiently dissipated and discharged.

2. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The part of the U-shaped heat pipe that contacts the main heat dissipation fins is the evaporation end, which accounts for 1 / 3 of the total length; the middle end is connected to the evaporation end, which accounts for 1 / 3 of the total length; the condensation end is the remaining 1 / 3; the umbrella-shaped heat dissipation fins are evenly distributed at the condensation end and are inclined at 10°-20° to the horizontal direction; the U-shaped heat pipe is made of copper tube, and the internal heat exchange medium is water.

3. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The outer wall of the bearing box is annularly distributed with main heat dissipation fins, which are evenly distributed in 6 to 8 layers from top to bottom; 14 to 18 pairs of U-shaped heat pipes are evenly distributed along the circumference of the main heat dissipation fins.

4. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The U-shaped heat pipe and the umbrella-shaped heat dissipation fins are integrally cast, and each U-shaped heat pipe condensation end is evenly provided with 5 umbrella-shaped heat dissipation fins in the same direction from top to bottom, and the outer diameter of the umbrella-shaped annular fins is three times the diameter of the U-shaped heat pipe.

5. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The U-shaped heat pipe is replaced by a gravity heat pipe, which is connected to the main heat dissipation fins by welding. The number of gravity heat pipes is half of that of the U-shaped heat pipes, and the evaporation end of the gravity heat pipe is welded to the main heat dissipation fins. The gravity heat pipe is made of copper pipe, and the internal heat exchange medium is water. The condensation end is at the top and the evaporation end is at the bottom, and the coolant reflux is achieved by gravity.

6. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling as claimed in claim 5, characterized in that: The gravity heat pipe and the umbrella-shaped heat dissipation fins are integrally cast. Eight umbrella-shaped heat dissipation fins in the same direction are evenly distributed from top to bottom at the condensing end of the gravity heat pipe. The outer diameter of the umbrella-shaped annular fins is three times the diameter of the gravity heat pipe.

7. A heat pipe assisted heat dissipation system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The motor base is provided with a circular array of air holes, the number and positions of which correspond to the U-shaped heat pipes.

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