A heat pipe fin air cooling system for bearing cooling on high temperature molten salt pump

Abstract

The present invention relates to a high-temperature molten salt pump, and in particular to a heat pipe type fin air cooling system for cooling bearings on a high-temperature molten salt pump. The present invention is provided with a U-shaped heat pipe, whose heat conductivity exceeds that of any known metal, and can quickly transfer the heat on the bearing box from the evaporation end to the condensation end, thereby improving the heat exchange efficiency; the condensation end of the U-shaped heat pipe is provided with an umbrella-shaped annular fin, which not only increases the heat transfer area, but also interrupts the continuous development of its boundary layer, improves the degree of turbulence, and thus improves the heat exchange performance of the U-shaped heat pipe; the upper wind wheel, the lower wind wheel and the spiral guide vane on the inner wall of the cover tube form a channel, which realizes the controllable air flow path and further improves the heat dissipation effect of the umbrella-shaped annular fin.

Description

Technical Field

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

[0002] High-temperature molten salt pump is a chemical pump mainly used in alumina, aluminum hydroxide and organic chemical processes. It can also be used as a main coolant circulation pump in solar thermal power generation processes. How to improve the life of the upper bearing of the molten salt pump in a high temperature environment has become one of the main difficulties in the research of this pump. Optimizing the cooling system of the upper bearing is of great help in solving the problem of short bearing life. Therefore, it is of great significance and engineering application value to propose a molten salt pump upper bearing cooling device with significant effect, moderate cost and space intensiveness.

[0003] A heat pipe is a heat transfer element that fully utilizes the principle of heat conduction and the rapid heat transfer properties of phase change media. Its thermal conductivity exceeds that of any known metal. It can be used in radiators to improve heat dissipation efficiency and reduce equipment space, but it is relatively expensive. Fins are often used in heat exchange equipment. The use of fins has the benefits of increasing the heat transfer area and reducing the thermal resistance of convective heat transfer. Its heat transfer efficiency is lower than that of heat pipes, but it is cheaper.

[0004] At present, patents have been proposed for cooling devices for molten salt pumps. Utility model CN201721091310.4 proposes a molten salt pump cooling device combining air cooling and water cooling, which has a good cooling effect, but the equipment is large in size and the spatial concentration is not high, which is not conducive to the optimization of the installation space. Utility model CN201721129289.2 proposes a new high-efficiency molten salt pump bearing air cooling system, which optimizes the air cooling structure, has a good spatial concentration and improved heat dissipation efficiency, but its heat sink design is relatively simple, the heat dissipation effect is general, and the optimization of the cooling effect cannot be achieved even with the optimized air cooling structure. Summary of the invention

[0005] The purpose of the present invention is to provide a heat pipe fin air cooling system for cooling bearings on a high-temperature molten salt pump to solve the above technical problems.

[0006] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is: a heat pipe fin air cooling system for cooling the upper bearing of a high-temperature molten salt pump, comprising a motor seat, a pump shaft and a bearing box, a hole is opened at the center of the top of the bearing box, a bearing is installed in the bearing box, a U-shaped heat pipe is installed on the outer surface of the bearing box, an umbrella-shaped annular fin is arranged on the outer side of the U-shaped heat pipe condensation section, a cover cylinder is arranged on the outer side of the bearing box, and a spiral guide plate is arranged on the inner wall of the cover cylinder to form a continuous spiral groove; the top end of the pump shaft extends out of the cover cylinder, an upper wind wheel is installed on the upper end of the pump shaft, and the upper wind wheel is located in the cover cylinder, the middle end of the pump shaft is installed in the center hole of the top end of the bearing box and is transitionally connected with it, the bearing and the middle end of the pump shaft are matched 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 seat and is transitionally connected with it, the lower end of the pump shaft is installed on the lower end of the pump shaft, and the lower wind wheel is located in the motor seat; the upper surface of the motor seat is provided with a ring array of wind holes and is connected with the internal space formed by the cover cylinder and the bearing box; the rotation of the pump shaft drives the upper wind wheel and the lower wind wheel to rotate without the need for an external power supply.

[0007] The number and position of the annular array air holes are consistent with those of the U-shaped heat pipe.

[0008] The spiral guide vane has an inclination angle of 5° with the horizontal direction;

[0009] 1 / 3 of the U-shaped heat pipe is the evaporation end, 1 / 3 is the middle end, and 1 / 3 is the condensation end; the part of the U-shaped heat pipe that contacts the bearing box is the evaporation end; the middle end that occupies 1 / 3 of the total length of the U-shaped heat pipe and is connected to the evaporation end is the middle end, which occupies 1 / 3 of the total length of the U-shaped heat pipe, and the condensation end is the remaining 1 / 3.

[0010] The beneficial effects of the present invention are as follows: a heat pipe type fin air cooling system for cooling bearings on a high-temperature molten salt pump, compared with the traditional structure: a U-shaped heat pipe is provided, whose thermal conductivity exceeds the thermal conductivity of any known metal, and can quickly transfer the heat on the bearing box from the evaporation end to the condensation end, thereby improving the heat exchange efficiency; the condensation end of the U-shaped heat pipe is provided with an umbrella-shaped annular fin, which not only increases the heat transfer area, but also interrupts the continuous development of its boundary layer, increases the degree of turbulence, and thereby improves the heat exchange performance of the U-shaped heat pipe; the upper wind wheel, the lower wind wheel and the spiral guide vanes on the inner wall of the cover tube form a channel, which realizes the controllable air flow path and further improves the heat dissipation effect of the umbrella-shaped annular fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure and cooling air flow path of the present invention.

[0012] Figure 2 It is a top view schematic diagram of the heat pipe position distribution of the present invention.

[0013] Figure 3 It is a schematic diagram of the assembly of the U-shaped heat pipe and the bearing box of the present invention.

[0014] Figure 4 It is a schematic diagram of the U-shaped heat pipe and umbrella-shaped annular fin structure of the present invention.

[0015] Figure 5 Schematic diagram of the pump shaft structure.

[0016] Figure 6 This is a top view of the motor base.

[0017] In the figure: 1. upper wind wheel; 2. spiral guide vane; 3. continuous spiral groove; 4. cover tube; 5. umbrella-shaped annular ribs; 6. U-shaped heat pipe; 7. motor base; 8. lower wind wheel; 9. bearing box; 10. bearing; 11. pump shaft; 12. air hole; 13. air path entering the upper wind wheel; 14. air path in the continuous spiral groove; 15. air path entering the lower wind wheel after passing through the heat sink; 16. air path outflowing from the lower wind wheel; 17. bolt; 18. threaded hole; 19. circular groove; 20. semicircular groove; 21. top end of the pump shaft; 22. upper end of the pump shaft; 23. middle end of the pump shaft; 24 lower end of the pump shaft. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail 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.

[0019] like Figure 1 As shown: a heat pipe fin air cooling system for cooling bearings on a high-temperature molten salt pump, which includes a motor base 7, a pump shaft 11 and a bearing box 9, wherein a bearing 10 is installed in the bearing box 9, an upper wind wheel 1 is arranged at the upper end of the bearing 10, and a lower wind wheel 8 is arranged at the lower end of the bearing 10, a U-shaped heat pipe 6 is installed on the outer surface of the bearing box 9, and an umbrella-shaped annular fins 5 are arranged on the outer side of the condensation section of the U-shaped heat pipe 6; an annular array of air holes 12 are opened on the surface of the motor base 7; a cover tube 4 is arranged on the outer side of the bearing box 9, the cover tube 4 is installed on the motor base 7, and a spiral guide vane 2 is arranged on the inner wall of the cover tube 4 to form a continuous spiral groove 3. The upper wind wheel 1 introduces cold air from the outside, see the air path 13 entering the upper wind wheel, which is the air path entering the upper wind wheel vertically downward. Under the action of the cover tube 4 and the spiral guide vane 2, a part of the air can move downward along the rotation direction of the continuous spiral groove 3, see the air path 14 in the continuous spiral groove, which is the air path spiraling downward along the continuous spiral groove; the contact time between the air and the umbrella-shaped annular ribs 5 is increased, and the heat exchange efficiency is improved; the other part of the air is blown down vertically to blow out the residual heat and enhance the heat exchange effect, see the air path 15 entering the lower wind wheel after passing through the heat sink, which is the air path entering the lower wind wheel vertically after passing through the heat sink; enter the motor base 7 through the air hole 12, and be discharged through the lower wind wheel 8, see the lower wind wheel outflow air path 16, which is the air path flowing out horizontally through the lower wind wheel; the air can be as follows Figure 1 Path flow.

[0020] like Figure 2 As shown: 12 to 20 U-shaped heat pipes 6 are arranged on the outer surface of the bearing box 9, and the specific number can be determined according to the outer diameter of the bearing box.

[0021] like Figure 3 As shown: the outer surface of the bearing box 9 is provided with 12 to 20 semicircular grooves 20 matching the diameter of the U-shaped heat pipe 6, and the specific number can be determined according to the number of heat pipes. The bearing box extends at the top of the semicircular groove to form a circular groove 19, which wraps the top of the evaporation end of the U-shaped heat pipe 6. At the same time, two vertically arranged threaded holes 18 are provided and screwed in with bolts 17. The semicircular groove 20 structure and the bolts 17 simultaneously fix the position of the U-shaped heat pipe, and at the same time facilitate the assembly and replacement of the U-shaped heat pipe 6.

[0022] like Figure 4 As shown: the U-shaped heat pipe 6 and the umbrella-shaped annular fins 5 are integrally cast, and 8 umbrella-shaped annular fins 5 are evenly distributed from top to bottom at the condensation end of the U-shaped heat pipe 6. The inclination angle of the umbrella-shaped annular fins 5 to the horizontal direction is between 12° and 18°, and the outer diameter is three times the diameter of the U-shaped heat pipe 6.

[0023] like Figure 5 As shown, the pump shaft 11 can be divided into four parts: a pump shaft top end 21, a pump shaft upper end 22, a pump shaft middle end 23, and a pump shaft lower end 24.

[0024] like Figure 6 As shown: a circular array of air holes 12 is provided on the surface of the motor base 7, and the number and positions of the circular array of air holes are consistent with those of the U-shaped heat pipe.

[0025] Further explain below in conjunction with the working process of the present invention:

[0026] During specific implementation, the present invention adopts heat pipe fins installed outside the bearing box for heat transfer and heat dissipation. The evaporation end of the U-shaped heat pipe 6 is close to the bearing box to absorb heat, the liquid wick evaporates, and the heat is transferred to the condensation end through the middle end. The liquid wick condenses and releases heat, and returns to the evaporation end under the capillary action. The heat is transferred to the umbrella-shaped annular fins 5 for heat dissipation, thereby achieving an efficient heat transfer effect; the upper wind wheel 1 introduces cold air from the outside, and under the action of the cover tube 4 and the spiral guide vane 2, a part of the air can move downward along the rotation direction of the continuous spiral groove 3, thereby increasing the contact time between the air and the umbrella-shaped annular fins 5 and improving the heat exchange efficiency; the other part of the air is blown down vertically to blow out the residual heat, thereby enhancing the heat exchange effect, and enters the lower wind wheel 8 chamber through the wind hole 12 for output, thereby realizing a controllable air flow path, and a reasonable flow path is conducive to improving the air cooling effect.

[0027] 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 fin air cooling system for high temperature molten salt pump bearing cooling, characterized in that: The system comprises a motor seat, a pump shaft and a bearing box; a hole is opened at the center of the top of the bearing box, a bearing is installed in the bearing box, a U-shaped heat pipe is installed on the outer surface of the bearing box, an umbrella-shaped annular rib is arranged on the outer side of the condensing section of the U-shaped heat pipe, a cover cylinder is arranged on the outer side of the bearing box, and a spiral guide vane is arranged on the inner wall of the cover cylinder to form a continuous spiral groove; the top end of the pump shaft extends out of the cover cylinder, an upper wind wheel is installed on the upper end of the pump shaft, and the upper wind wheel is located in the cover cylinder, the middle end of the pump shaft is installed in the center hole at the top end of the bearing box and is transitionally connected thereto, the bearing and the middle end of the pump shaft are matched with a base hole system, the lower end of the pump shaft is installed in the center hole on the upper surface of the motor seat and is transitionally connected thereto, the lower end of the pump shaft is installed on the lower end of the pump shaft, and the lower wind wheel is located in the motor seat; the motor An annular array of wind holes is provided on the upper surface of the base and is connected to the internal space formed by the cover tube and the bearing box; the rotation of the pump shaft drives the upper wind wheel and the lower wind wheel to rotate; 1 / 3 of the U-shaped heat pipe is the evaporation end, 1 / 3 is the middle end, and 1 / 3 is the condensation end; the contact part of the U-shaped heat pipe with the bearing box is the evaporation end, accounting for 1 / 3 of the total length of the U-shaped heat pipe; the middle end is connected to the evaporation end, accounting for 1 / 3 of the total length of the U-shaped heat pipe; the condensation end is the remaining 1 / 3; the U-shaped heat pipe and the umbrella-shaped annular fins are integrally cast, and 8 umbrella-shaped annular fins are evenly distributed from top to bottom at the condensation end of the U-shaped heat pipe, the inclination angle of the umbrella-shaped annular fins to the horizontal direction is between 12° and 18°, and the outer diameter is three times the diameter of the U-shaped heat pipe.

2. A heat pipe fin air cooling system for high temperature molten salt pump bearing cooling according to claim 1, characterized in that: The number and position of the annular array air holes are consistent with those of the U-shaped heat pipe.

3. A heat pipe fin air cooling system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The spiral guide vane has an inclination angle of 5° with the horizontal direction.

4. A heat pipe fin air cooling system for high temperature molten salt pump upper bearing cooling according to claim 1, characterized in that: The outer surface of the bearing box is arrayed with 12 to 20 U-shaped heat pipes; the outer surface of the bearing box is provided with 12 to 20 semicircular grooves matching the diameter of the U-shaped heat pipes, and the bearing box extends over the top of the semicircular grooves to form a circular groove, which wraps the top of the evaporating end of the U-shaped heat pipe, and has two vertically arranged threaded holes which are screwed in with bolts. The semicircular groove structure and the bolts simultaneously fix the position of the U-shaped heat pipe, and are convenient for assembling and replacing the U-shaped heat pipe.

5. A heat pipe fin air cooling system for high temperature molten salt pump bearing cooling according to claim 1, characterized in that: Heat pipe fins are installed outside the bearing box for heat transfer and heat dissipation. The evaporating end of the U-shaped heat pipe is close to the bearing box to absorb heat, and the liquid wick evaporates and transfers the heat to the condensing end through the middle end. The liquid wick condenses and releases heat, and returns to the evaporating end under the capillary action. The heat is transferred to the umbrella-shaped annular fins for heat dissipation, thereby achieving an efficient heat transfer effect; the upper wind wheel introduces cold air from the outside, and under the action of the cover tube and the spiral guide vane, a part of the air can move downward along the rotation direction of the continuous spiral groove, thereby increasing the contact time between the air and the umbrella-shaped annular fins and improving the heat exchange efficiency; the other part of the air is blown down vertically to blow out the residual heat, thereby enhancing the heat exchange effect, and enters the lower wind wheel chamber through the annular array wind holes for output, thereby realizing a controllable air flow path and improving the air cooling effect.

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