High-temperature molten salt pump

Abstract

The utility model discloses a high-temperature molten salt pump which comprises a pump body, a pump cover, a pump shaft and a bottom plate, a supporting pipe is arranged on the pump shaft, the supporting pipe and an output pipe are arranged in a jacketed pipe, a plurality of small holes are formed in the side wall of the output pipe, a medium enters an inner cavity of the jacketed pipe through the small holes, and it is guaranteed that the supporting pipe and the output pipe are heated consistently. An outlet assembly, a filler cavity, a bearing box support and a motor support are sequentially arranged on the bottom plate, the outlet assembly comprises a hollow cavity, a high-temperature medium is introduced into the cavity, it is guaranteed that the outlet assembly cannot deform due to temperature difference, and a heat insulation layer is arranged on the upper portion of the outlet assembly to prevent high-temperature heat from being transmitted upwards. According to the utility model, the structural design is reasonable, when a medium is output from the output pipe, the medium enters the inner cavity of the jacketed pipe through the small holes, so that the inner pipe body of the whole jacketed pipe is uniformly heated, the stability of the pump structure is improved, and the service life of the pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of molten salt pumps, in particular to a high-temperature molten salt pump. Background Art

[0002] The high-temperature molten salt submerged pump is suitable for transporting high-temperature molten salt (53% KNO3, 40% NaNO2, 7% NaNO3) with a temperature of about 450°C and a specific gravity of 1.8 - 2.0. It is widely used in industries such as ion-exchange membrane caustic soda, petrochemical, alumina, and solar energy, and can also be used to transport liquids of other high-temperature special media. The working principle of the molten salt pump is that the bottom end of the pump shaft is connected to the impeller, the motor drives the pump shaft to rotate, the impeller sucks in the medium, and the medium is output through the liquid outlet pipe at the pump body. The liquid outlet pipe of the pump is continuously heated at a high temperature, while the support pipe connecting the pump body and the base is heated relatively less and has a lower temperature, resulting in uneven heating of the entire pump, deformation, affecting the structural stability during the operation of the pump, and reducing the service life of the pump. Summary of the Invention

[0003] The purpose of the utility model is to solve the above technical problems and provide a high-temperature molten salt pump.

[0004] In order to achieve the above technical purpose and meet the above technical requirements, the technical solution adopted by the utility model is: a high-temperature molten salt pump, including a pump body, a pump cover, a pump shaft, and a bottom plate. A coupling is provided at the upper end of the pump shaft, and an impeller is provided at the lower end. The impeller is locked by an impeller nut. A support pipe is provided on the pump shaft, and the support pipe and the output pipe are arranged in a jacket. A number of small holes are provided on the side wall of the output pipe, and the transported medium enters the inner cavity of the jacket through the small holes to ensure that the support pipe and the output pipe are heated uniformly. An outlet assembly, a stuffing box cavity, a bearing box bracket, and a motor bracket are sequentially arranged on the bottom plate. The outlet assembly includes a hollow cavity, and high-temperature medium passes through the cavity to ensure that the outlet assembly will not be deformed due to temperature differences. An insulating layer is provided on the upper part of the outlet assembly to prevent the upward transfer of high-temperature heat.

[0005] Preferably: The small holes are provided at the upper and lower ends of the adjacent side of the support pipe.

[0006] Preferably: The lower end of the pump shaft is connected to the pump body through a lower shaft sleeve and a bush.

[0007] Preferably: The pump shaft is connected to the stuffing box cavity through a stuffing shaft sleeve. A stuffing and a stuffing gland are provided between the stuffing shaft sleeve and the stuffing box cavity, and a cooling cavity gland is provided at the upper end of the stuffing box cavity.

[0008] Preferably: A bearing box is provided on the bearing box bracket. A bearing and a shaft sleeve are provided in the bearing box. A bearing washer and a round nut are provided on the shaft sleeve. A bearing gland is provided at the upper end of the bearing box, and a cooling water jacket is provided on the outer circle of the bearing box.

[0009] Preferably, the pump body is arranged as a symmetric double volute pump body.

[0010] Compared with the traditional structure, the beneficial effects of the present utility model are as follows:

[0011] 1. The structure of the present utility model is reasonably designed. The jacketed pipe is sleeved outside the support pipe and the output pipe. When the medium is output from the output pipe, the medium enters the inner cavity of the jacketed pipe through the small holes at the same time, ensuring that the inner pipe body of the whole jacketed pipe is uniformly heated, preventing deformation caused by inconsistent thermal expansion coefficients of the pipe bodies, improving the stability of the pump structure, and extending the service life of the pump.

[0012] 2. The double volute pump body with a symmetric volute design is adopted, which can better balance the radial force and prevent the influence of impeller eccentricity on the shaft sleeve.

[0013] 3. By introducing high-temperature medium into the cavity of the outlet assembly, on the one hand, it prevents the molten salt from solidifying due to the low temperature in the cavity, and on the other hand, it prevents deformation caused by temperature differences in the connecting pipes of the outlet assembly; the heat insulation layer of heat-insulating cotton is adopted to prevent the upward transfer of high-temperature heat, playing a good heat insulation role.

[0014] 4. The water-cooled structure is adopted to effectively reduce the working temperature of the bearing, extend the service life of the bearing, and improve the operation reliability of the pump. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model;

[0016] In the figure: 1. pump cover, 2. impeller nut, 3. impeller, 4. pump body, 5. lower shaft sleeve, 6. bushing, 7. jacketed pipe, 8. pump shaft, 9. bottom plate, 10. outlet assembly, 101. cavity, 102. heat insulation layer, 11. stuffing box cavity, 12. packing, 13. packing gland, 14. cooling cavity gland, 15. stuffing shaft sleeve, 16. bearing box support, 17. bearing box, 18. shaft sleeve, 19. cooling water jacket, 20. bearing, 21. bearing washer, 22. bearing gland, 23. round nut, 24. motor support, 25. coupling, 26. support pipe, 27. output pipe, 271. small hole. Detailed Embodiment

[0017] The present utility model will be further described below.

[0018] Refer to the attached Figure 1, a high-temperature molten salt pump, comprising a pump body 4, a pump cover 1, a pump shaft 8, and a bottom plate 9. A coupling 25 is arranged at the upper end of the pump shaft 8, and an impeller 3 is arranged at the lower end. The impeller 3 is locked by an impeller nut 2. It is characterized in that: a support pipe 26 is arranged on the pump shaft 8, and the support pipe 26 and an output pipe 27 are arranged in a jacket pipe 7. A plurality of small holes 271 are arranged on the side wall of the output pipe 27. The conveying medium enters the inner cavity of the jacket pipe 7 through the small holes 271 to ensure that the support pipe 26 and the output pipe 27 are heated uniformly. An outlet assembly 10, a stuffing box 11, a bearing box bracket 16, and a motor bracket 24 are sequentially arranged on the bottom plate 9. The outlet assembly 10 includes a hollow cavity 101, and a high-temperature medium passes through the cavity 101 to ensure that the outlet assembly 10 will not be deformed due to temperature difference. An insulating layer 102 is arranged on the upper part of the outlet assembly 10 to prevent the upward transfer of high-temperature heat.

[0019] In this preferred embodiment, the small holes 271 are arranged at the upper and lower ends of the adjacent side of the support pipe 26.

[0020] In this preferred embodiment, the lower end of the pump shaft 8 is connected to the pump body 4 through a lower shaft sleeve 5 and a bush 6.

[0021] In this preferred embodiment, the pump shaft 8 is connected to the stuffing box 11 through a stuffing shaft sleeve 15. A stuffing 12 and a stuffing gland 13 are arranged between the stuffing shaft sleeve 15 and the stuffing box 11. A cooling cavity gland 14 is arranged at the upper end of the stuffing box 11.

[0022] In this preferred embodiment, a bearing box 17 is arranged on the bearing box bracket 16. A bearing 20 and a shaft sleeve 18 are arranged in the bearing box 17. A bearing washer 21 and a round nut 23 are arranged on the shaft sleeve 18. A bearing gland 22 is arranged at the upper end of the bearing box 17. A cooling water jacket 19 is arranged on the outer circle of the bearing box 17.

[0023] In this preferred embodiment, the pump body 4 is arranged as a symmetric double volute pump body, which can better balance the radial force and prevent the impeller 3 from being eccentric and affecting the shaft sleeve.

[0024] During specific implementation, the molten salt pump is mainly composed of a motor bracket 24, a bearing box bracket 16, a bearing box 17, a stuffing cavity 11, an outlet assembly 10, a support pipe 26, an output pipe 27, a jacket pipe 7, a pump shaft 8, a pump body 4, an impeller 3, a pump cover 1 and a base plate 9. The pump body 4, the pump cover 1, the impeller 3 and the like constitute the flow-through part of the pump. The support pipe 26 is used to connect the pump body 4 and the outlet assembly 10. The medium is sucked in through the impeller 3 and output from the pump body 4 to the customer pipeline through the output pipe 27. Part of the medium enters the inner cavity of the jacket pipe 7 through the small hole 271 at the same time, ensuring that the entire jacket pipe is heated evenly, thereby improving the stability of the pump structure and extending the service life of the pump. Since the output pipe 27 conveys high-temperature medium, by passing high-temperature medium, such as high-temperature steam, into the hollow cavity 101 of the outlet component, on the one hand, the molten salt in the output pipe 27 is prevented from solidifying due to the low temperature in the cavity 101, and on the other hand, deformation caused by the temperature difference of the outlet component 10 is prevented; a heat-insulating cotton insulation layer 102 is set above the outlet component to prevent the high-temperature heat from transferring upward, which plays a good role in heat insulation. Carbon fiber filler is used for sealing, and cooling water is passed through the cooling cavity to prevent the high-temperature heat from transferring upward; the water-cooling structure is used outside the bearing box to effectively reduce the working temperature of the bearing, with good cooling effect, extend the service life of the bearing, and improve the operating reliability of the pump.

[0025] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A high-temperature molten salt pump, comprising a pump body (4), a pump cover (1), a pump shaft (8), and a base plate (9), wherein a coupling (25) is arranged at the upper end of the pump shaft (8), and an impeller (3) is arranged at the lower end, and the impeller (3) is locked by an impeller nut (2), characterized in that: A support tube (26) is arranged on the pump shaft (8), and the support tube (26) and the output tube (27) are arranged in the jacket tube (7). A plurality of small holes (271) are arranged on the side wall of the output tube (27), and the conveying medium enters the inner cavity of the jacket tube (7) through the small holes (271). An outlet assembly (10), a packing cavity (11), a bearing box bracket (16), and a motor bracket (24) are arranged in sequence on the bottom plate (9). The outlet assembly (10) includes a hollow cavity (101), and a high-temperature medium flows through the cavity (101) to ensure that the outlet assembly (10) will not be deformed due to temperature differences. A heat insulation layer (102) is arranged on the upper part of the outlet assembly (10).

2. The high temperature molten salt pump according to claim 1, characterized in that: The small holes (271) are arranged at the upper and lower ends of the side adjacent to the support tube (26).

3. The high temperature molten salt pump according to claim 1, characterized in that: The lower end of the pump shaft (8) is connected to the pump body (4) via a lower shaft protection sleeve (5) and a bushing (6).

4. The high temperature molten salt pump according to claim 1, characterized in that: The pump shaft (8) is connected to the packing cavity (11) via a packing sleeve (15); a packing (12) and a packing gland (13) are provided between the packing sleeve (15) and the packing cavity (11); and a cooling cavity gland (14) is provided at the upper end of the packing cavity (11).

5. The high temperature molten salt pump according to claim 1, characterized in that: A bearing box (17) is arranged on the bearing box bracket (16), a bearing (20) and a shaft sleeve (18) are arranged inside the bearing box (17), a bearing washer (21) and a round nut (23) are arranged on the shaft sleeve (18), a bearing pressure cover (22) is arranged at the upper end of the bearing box (17), and a cooling water jacket (19) is arranged on the outer circle of the bearing box (17).

6. The high temperature molten salt pump according to claim 1, characterized in that: The pump body (4) is configured as a symmetrical double volute pump body.

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