High-flow low-lift high-temperature molten salt pump

Abstract

The utility model relates to a high-flow low-lift high-temperature molten salt pump which comprises a pump cover assembly, a lower guide shaft sleeve, a double-suction impeller, a pump body, a pump shaft, a liquid discharge pipe assembly, a sleeve coupling, a liquid throwing disc, a sealing part, a foundation plate assembly, a rolling bearing and the like. The pump body volute is a double-volute, the double-suction impeller is matched with the pump body, and high-temperature fused salt is sucked from the two sides of the double-suction impeller, boosted through the impeller and then discharged from an outlet of the pump body. The liquid discharging pipe assembly comprises a liquid discharging pipe and a supporting protection pipe; the suction inlet of the pump body is used for axial two-side suction, the discharge outlet is spirally ascended to be eccentric and then is used for axial discharge, the center line of the outlet of the pump body is concentric with a liquid discharge pipe of the liquid discharge pipe assembly, and the centers of the pump body and the liquid discharge pipe coincide with the operation center line of the pump rotor component. Due to the adoption of the double-volute spiral pump body and the liquid discharge pipe assembly, the pump effectively solves the prominent problems of an existing product, is safe and reliable in operation and small in failure risk, improves the operation economic benefits of a power station, and effectively avoids safety accidents such as shutdown and molten salt leakage.

Description

Technical Field

[0001] The utility model relates to a high-temperature molten salt pump, in particular to a large-flow and low-lift high-temperature molten salt pump with safe and reliable operation, small failure risk, improved economic benefits of power station operation, and effective avoidance of safety accidents such as shutdown and molten salt leakage. Background Technique

[0002] A high-temperature molten salt pump is a submerged pump in high-temperature and corrosive molten salt, and is widely used in molten salt energy storage power generation systems for solar thermal applications and other high-temperature molten salt transportation fields such as chemical industry.

[0003] As one of the most critical equipment in the molten salt energy storage power generation system for solar thermal applications, the molten salt pump has stringent requirements for pump design, material selection, technology, etc. due to its need to operate under high-temperature conditions for a long time. In actual operation, if the molten salt pump fails and causes a shutdown accident, it will cause significant economic losses or serious safety accidents to the overall operation of the power station. With the increasing requirements for sustainable development and the development of high-tech solar thermal energy storage technology towards large-capacity, the development of large-flow molten salt pumps is imperative.

[0004] Most of the existing large-flow and low-lift high-temperature molten salt pumps adopt the design of direct discharge long-shaft submerged pumps or single-stage side discharge submerged suspended pumps. Due to the harsh and dangerous operating conditions of such pumps, involving high-temperature and corrosive media, there are various problems in the design of main shaft seals and rotor stability.

[0005] Due to the single-suction structure of the existing large-flow and low-lift high-temperature molten salt pumps, the areas of the front and rear covers of the impeller are different, resulting in axial force. Although there are various axial force balance methods for pumps with single-suction impeller mechanisms, these measures are all achieved by increasing production and processing costs or reducing pump performance.

[0006] Due to the single-suction structure of the existing large-flow and low-lift high-temperature molten salt pumps, due to the large flow rate required by the pump design, at the same flow rate, the volume of the pump body of the single-suction structure pump increases significantly, which in turn leads to a significant increase in the volume of other related structure designs, and a significant increase in the pump shaft load, a decrease in efficiency, potential safety hazards in operation, and a significant increase in the processing and manufacturing costs of the customer's molten salt storage tank.

[0007] Under the same parameters, the existing large-flow and low-lift high-temperature molten salt pumps have a relatively large specific speed and a small blade inlet area, and there is a potential risk of cavitation in the impeller, resulting in a decrease in the operating reliability of the molten salt pump and potential safety hazards.

[0008] The existing large-flow, low-lift, high-temperature molten salt pumps basically adopt the traditional outlet-connected independent discharge pipe structure design. Since the discharge pipe is far away from the rotor running centerline and there is a large quality gap between the two, the thermal deformation state is unstable under high temperature conditions, the pump pipeline stress and load increase, resulting in rotor center deflection, which in turn leads to a deterioration of the rotor steady-state effect, wear of the bearings and sealing components, and the installation space is large, which is not conducive to the on-site layout design and increases the customer's infrastructure investment, resulting in poor economic efficiency.

[0009] The existing large-flow, low-lift, high-temperature molten salt pump, when using a long-axis pump solution, has its rotor components in contact with the high-temperature molten salt. The high-temperature and corrosive molten salt directly contacts the hydraulic rotor components and is transmitted to the sealing assembly and the end of the bearing component through the pump shaft. Although a variety of cooling measures are adopted in the design project, these are all achieved in the form of increasing the heat dissipation space distance and the heat dissipation area or adding other structures. In addition, due to its low head and large flow, and the short underwater depth in the application occasions, the pump liquid outlet pressure directly acts on the sealing part. Although pressure reduction and throttling methods such as throttling bushings are used, it is impossible to effectively avoid the pressure difference between the main shaft sealing part and the atmospheric side, which leads to sealing difficulties, and the risk of leakage of high-temperature corrosive molten salt is greatly increased.

[0010] The existing high-flow, low-lift, high-temperature molten salt pumps use a single-suction structure, and the areas of the front and rear cover plates of the impeller are different, which causes axial force. Although there are many ways to balance the axial force of the existing single-suction impeller mechanism pumps, these measures are all achieved by increasing production and processing costs or reducing pump performance. In order to solve the above problems, it is usually solved by machining balance holes or rear rings on the impeller to increase the blade inlet area. Although the machining balance holes and rear rings have better axial force balancing capabilities, due to their own leakage and backflow problems, they will cause the impeller efficiency to decrease, thereby increasing the unit power and significantly increasing costs.

[0011] The existing high-flow, low-lift, high-temperature molten salt pumps use a single-suction structure. Since the pump design requires a large flow rate, under the same flow rate, the volume of the single-suction pump body increases significantly, which in turn causes the volume of other associated structural designs to also increase significantly. In addition, the pump shaft load increases significantly, the efficiency decreases, there are hidden dangers to safe operation, and the processing and manufacturing costs of customers' molten salt storage tanks increase significantly.

[0012] Under the same parameters, the specific speed of existing high-flow, low-head, high-temperature molten salt pumps is relatively large and the blade inlet area is relatively small. There is a potential risk of cavitation in the impeller, which reduces the operating reliability of the molten salt pump and poses a safety hazard. Increasing the blade inlet area can improve the cavitation resistance performance. However, under the same parameters, to achieve this goal, the radial size of the impeller will inevitably increase significantly, the overall size of the impeller will become larger, and the mass will increase, resulting in an increase in manufacturing costs and potential operating risks. Summary of the Invention

[0013] Aiming at the above problems, the main purpose of the present invention is to provide a high-flow, low-head, high-temperature molten salt pump with safe and reliable operation, low failure risk, improved economic benefits of power station operation, and effective avoidance of safety accidents such as shutdown and molten salt leakage.

[0014] The present invention solves the above technical problems through the following solutions: A high-flow, low-head, high-temperature molten salt pump, which includes: a pump cover assembly, a lower guide shaft sleeve, a double-suction impeller, a pump body, a pump shaft, a drain pipe assembly, a sleeve coupling, a liquid slinger, a sealing component, a base plate assembly, and a rolling bearing.

[0015] The pump body volute is a double volute. The double-suction impeller is fixed on the pump shaft. The double-suction impeller, the lower guide shaft sleeve, the sleeve coupling, the liquid slinger, the lower fan, the upper fan, the pump shaft, and the rolling bearing together form the rotor component of the pump.

[0016] The double-suction impeller cooperates with the pump body. High-temperature molten salt is sucked from both sides of the double-suction impeller and discharged from the pump body outlet after being pressurized by the impeller. The drain pipe assembly includes a drain pipe and a support protection pipe.

[0017] The support protection pipe of the drain pipe assembly and the pump shaft are both of segmented structures. The support protection pipes are connected by flanges. The pump shaft is connected by a sleeve coupling. The sleeve coupling and the guide bearing together form the guide bearing assembly of the pump.

[0018] The suction port of the pump body is axially sucked from both sides, and the discharge port is spirally lifted eccentrically and then discharged axially. The center line of the pump body outlet is concentric with the drain pipe of the drain pipe assembly, and the centers of both coincide with the operating center line of the pump rotor component. The drain pipe assembly is fixed on the pump body.

[0019] The liquid slinger is installed below the sealing component, and the sealing component is installed on the base plate assembly.

[0020] In a specific embodiment of the present invention, one end of the double-suction impeller is positioned by the shaft shoulder of the pump shaft, and the other end is fixed on the pump shaft by the lower guide shaft sleeve and the locking nut.

[0021] In a specific embodiment of the present invention, the drain pipe assembly is connected to the pump body by flanges and bolts.

[0022] In a specific embodiment of the present utility model, the pump cover assembly includes an intake end cover and a lower guide bearing. The intake of the intake end cover is designed as a trumpet-shaped tapered type, and a flow disturbance partition is provided at the intake of the trumpet-shaped tapered type.

[0023] In a specific embodiment of the present utility model, the sealing assembly is connected to the upper side of the base plate assembly by studs.

[0024] In a specific embodiment of the present utility model, the upper and lower parts of the rolling bearing are respectively provided with the upper fan and the lower fan. The lower fan is located between the upper bearing component and the sealing component; an air guiding channel is designed on the base plate assembly, and a large-area heat sink for increasing the heat dissipation efficiency is provided on the upper bearing assembly.

[0025] The positive and progressive effects of the present utility model are as follows: Compared with common similar technologies, the large-flow, low-head, high-temperature molten salt pump provided by the present utility model has the following advantages:

[0026] 1. The integrated design of the drain pipe and the support pipe separates the high-temperature and corrosive molten salt from the running center line of the pump rotor, effectively preventing the contact between the high-temperature and corrosive molten salt and the rotor, reducing the corrosion of the molten salt on the main shaft, reducing the transfer of high-temperature heat through the main shaft to the packing and bearing components, and effectively reducing the risk of bearing component failure.

[0027] 2. The design of separating the drain pipe from the pump shaft enables the high-temperature, high-pressure and corrosive molten salt medium not to directly act on the main shaft sealing part, reducing the risk of leakage of the high-temperature and corrosive molten salt medium from the main shaft end, reducing the difficulty of main shaft sealing and reducing the operation and maintenance risks.

[0028] 3. The center of gravity of the pump unit coincides with the running center line of the pump running rotor, making the operation of the pump more stable, reducing the operation risk, reducing the installation space, and reducing the customer's infrastructure construction cost.

[0029] 4. The highly efficient double-volute spiral pump body cooperates with the double-suction impeller. While ensuring the same working parameters, it improves the operation efficiency and operation stability, greatly reduces the volume of the pump unit, improves the operation stability of the pump unit, reduces the processing and manufacturing cost, and also reduces the customer's infrastructure construction and maintenance costs.

[0030] 5. The present utility model has good heat dissipation performance. A forced air-cooled lower fan is installed at the sealing assembly of the pump, and an air guiding channel is designed on the base plate assembly to prevent high temperature from being transferred from the main sealing assembly to the upper bearing assembly. The upper fan forcibly air-cools the shaft upper bearing assembly, and a large-area heat sink for increasing the heat dissipation efficiency is designed on the upper bearing assembly.

[0031] 6. The liquid-throwing disc in the present utility model prevents the molten salt from leaking axially to the atmosphere side.

[0032] 7. The spoiler partition in the present utility model also provides support for the lower guide bearing housing, with excellent water performance and effectively reducing the impact and vortex losses of the liquid flow before entering the impeller, avoiding the risk of vibration and noise generated by the design. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0034] Figure 2 is Figure 1 an enlarged view of the upper half of

[0035] Figure 3 is Figure 1 an enlarged view of the lower half of

[0036] The following are the names corresponding to the reference numerals in the present utility model:

[0037] Pump cover assembly 1, lower guide bushing 2, double-suction impeller 3, pump body 4, drain pipe assembly 5, pump shaft 6, sleeve coupling 7, guide bearing 8, rotor assembly 9, liquid-throwing disc 10, sealing assembly 11, base plate assembly 12, lower fan 13, upper bearing assembly 14, upper fan 15, rolling bearing 16, air guiding channel 1201, suction end cover 101, lower guide bearing 102, spoiler partition 103, lower guide bearing housing 104, drain pipe 502, support pipe 501. Detailed Embodiment

[0038] The following presents a preferred embodiment of the present utility model in conjunction with the drawings to elaborate in detail on the technical solution of the present utility model.

[0039] Figure 1 is a schematic diagram of the overall structure of the present utility model, Figure 2 is Figure 1 an enlarged view of the upper half of Figure 3 is Figure 1 an enlarged view of the lower half of, as Figure 1-3 shown: The large-flow low-head high-temperature molten salt pump provided by the present utility model includes pump cover assembly 1, suction end cover 101, lower guide bearing 102, spoiler partition 103, lower guide bearing housing 104, lower guide bushing 2, double-suction impeller 3, pump body 4, drain pipe assembly 5, pump shaft 6, sleeve coupling 7, guide bearing 8, rotor assembly 9, liquid-throwing disc 10, sealing assembly 11, base plate assembly 12, air guiding channel 1201, lower fan 13, upper bearing assembly 14, upper fan 15. The volute of the pump body 4 is a double volute, the double-suction impeller 3 is fixed on the pump shaft 6, and the double-suction impeller 3, lower guide bushing 2, sleeve coupling 7, liquid-throwing disc 10, lower fan 13, upper fan 15, pump shaft 6 and rolling bearing 16 together form the rotor assembly 9 of the pump.

[0040] One end of the double-suction impeller 3 is positioned by a shaft shoulder, and the other end is fixed by a lower guide bushing 2 and a lock nut. The flat key transmits the working torque for the impeller. The double-suction impeller 3, the lower guide bushing 2, the sleeve coupling 7, the liquid-throwing disc 10, the lower fan 13, the upper fan 15, the pump shaft 6 and the rolling bearing 16 together form the rotor component 9 of the pump. The double-suction impeller 3 cooperates with the pump body 4. High-temperature molten salt is inhaled from both sides of the double-suction impeller 3, pressurized by the impeller, and discharged from the outlet of the pump body 4. The liquid-throwing disc 10 in the present invention prevents the molten salt from leaking axially to the atmosphere side.

[0041] The suction port of the pump body 4 is axially inhaled from both sides, and the discharge port is spirally rising and eccentric and then discharged axially. The drain pipe assembly 5 includes a drain pipe 502 and a support and protection pipe 501. The center line of the outlet of the pump body 4 is concentric with the drain pipe 502 of the drain pipe assembly 5, and the design centers of both coincide with the running center line of the pump rotor component 9. The volute of the pump body 4 adopts a special double-volute design, which can not only ensure the high efficiency of the hydraulic design but also balance the radial force and the uneven characteristics of the high-temperature deformation of the pump body in terms of structure. The pump body 4 is connected to the drain pipe assembly 5 through a flange and bolts.

[0042] The suction end cover 101 and the lower guide bearing 102 together form the pump cover assembly 1. The inlet of the suction end cover 101 is designed as a flared and tapered shape, and a flow-disturbing partition plate is provided at the inlet of the flared and tapered shape. The flow-disturbing partition plate 103 also provides support for the lower guide bearing seat 104. It has excellent water performance and effectively reduces the impact and vortex losses of the liquid flow before entering the impeller, avoiding the risk of vibration and noise generated by the design.

[0043] One end of the double-suction impeller 3 is positioned by a shaft shoulder, and the other end is fixed by a lower guide bushing 2 and a lock nut. The flat key transmits the working torque for the impeller. The double-suction impeller 3 cooperates with the pump body 4. High-temperature molten salt is inhaled from both sides of the double-suction impeller 3, pressurized, and discharged from the outlet of the pump body 4.

[0044] The support and protection pipe 501 of the drain pipe assembly 5 and the pump shaft 6 are both of segmented structures. The support and protection pipes 501 are connected through flanges, and the pump shaft 6 is connected through a sleeve coupling 7. The sleeve coupling 7 and the guide bearing 8 together form the guide bearing assembly of the pump, providing running support for the rotor component 9.

[0045] A forced-air-cooled lower fan 13 is installed at the seal assembly 11 of the pump, and an air guiding channel 1201 is designed on the base plate assembly 12, preventing high temperature from being transmitted from the main seal assembly 11 to the upper bearing assembly 14. The upper fan 15 forcibly air-cools the shaft upper bearing assembly 14, and a large-area heat sink for increasing the heat dissipation efficiency is designed on the upper bearing assembly 14.

[0046] The present invention solves the following technical problems:

[0047] 1. The existing high-flow, low-lift, high-temperature molten salt pumps basically adopt the traditional outlet-connected independent discharge pipe structure design. Since the discharge pipe is far away from the rotor running center line and there is a large quality gap between the two, the thermal deformation state is unstable under high temperature conditions, the pump pipeline stress and load increase, resulting in rotor center deflection, which in turn leads to a deterioration of the rotor steady-state effect, wear of the bearings and sealing components, and the installation space is large, which is not conducive to the on-site layout design and increases the customer's infrastructure investment, resulting in poor economic efficiency.

[0048] Solution: The utility model effectively increases the distance between the discharge pipe and the pump rotor center through the spiral double volute pump body, so that the overall center of gravity of the pump returns to the vicinity of the pump rotor centerline, the pump runs more smoothly, reduces the risk of failure of the sealing assembly bearing components, and greatly reduces the installation space of the pump, reducing the customer's infrastructure investment cost. The spiral double volute pump body design makes the axial and radial thermal expansion of the pump body more uniform, and also makes the radial force autonomously balanced and controllable when the pump is running, fundamentally solving the radial instability factor and increasing the reliability of the pump operation.

[0049] 2. The existing high-flow, low-lift, high-temperature molten salt pump, when using the long-axis pump solution, has its rotor components in contact with the high-temperature molten salt. The high-temperature and corrosive molten salt directly contacts the hydraulic rotor components and is transmitted to the sealing assembly and the end of the bearing component through the pump shaft. Although a variety of cooling measures are adopted in the design project, these are all achieved by increasing the heat dissipation space distance and the heat dissipation area or adding other structures. In addition, due to its low head and large flow rate, and the use occasions are often short in the liquid depth, the pump liquid outlet pressure directly acts on the sealing part. Although the throttling bushing and other pressure reduction and throttling methods are adopted, it is impossible to effectively avoid the pressure difference between the main shaft sealing part and the atmospheric side, which leads to sealing difficulties, and the risk of leakage of high-temperature corrosive molten salt is greatly increased.

[0050] Solution: The utility model adopts a spiral double volute pump body. After the pump sucks in the medium from the axial direction, it passes through the spiral section and is discharged from the axial eccentric side of the pump body through an independent discharge pipe, so that the high-temperature and corrosive medium is effectively separated from the pump main shaft sealing component, so that the pressure acting on the main shaft sealing part is greatly reduced, fundamentally eliminating the risk of high-temperature and corrosive media leaking from the main shaft end, effectively eliminating high-temperature corrosive molten salt and reducing operation and maintenance risks.

[0051] The utility model adopts a spiral double volute pump body. After the pump sucks the medium axially and passes through the spiral section, the medium is discharged from the axially eccentric side of the pump body through an independent drain pipe, so that the high-temperature and corrosive medium is effectively separated from the main shaft seal assembly of the pump, greatly reducing the pressure acting on the main shaft seal part. Fundamentally, the risk of leakage of high-temperature and corrosive medium from the main shaft end is eliminated, effectively preventing high-temperature corrosive molten salt and reducing the operation and maintenance risks.

[0052] 3. Existing large-flow and low-head high-temperature molten salt pumps adopt a single-suction structure. The different areas of the front and rear covers of the impeller result in axial force. Although there are various axial force balance methods for pumps with a single-suction impeller structure, these measures are all achieved by increasing production and processing costs or reducing the pump performance. To solve the above problems, methods such as machining balance holes or rear mouth rings on the impeller are usually adopted to increase the blade inlet area. Although machining balance holes and rear mouth rings have good axial force balance ability, due to their own leakage and reflux problems, the impeller efficiency will be reduced, resulting in an increase in the unit power and a significant increase in cost.

[0053] Solution: Through the spiral pump body and the compact drain pipe, the spiral-designed pump body effectively increases the distance between the drain pipe and the pump operation center, making the overall center of gravity of the pump return to near the pump operation center line. The pump runs more smoothly, reducing the risk of bearing component failure and greatly reducing the installation foundation space. The drain pipe and the main shaft protection pipe are integrally connected and manufactured through special-shaped flanges, effectively solving the problem of instability in the split design of the existing structure. And its built-in guide bearing lubrication and flushing structure effectively reduces the risk of high-temperature deformation and failure of the external connecting pipes, while reducing the number of components and the processing and manufacturing costs.

[0054] 4. Existing large-flow and low-head high-temperature molten salt pumps adopt a single-suction structure. Due to the large flow requirement in the pump design, at the same flow rate, the volume of the pump body of the single-suction structure pump increases significantly, which in turn leads to a significant increase in the volume of other related structure designs, and a significant increase in the pump shaft load, a decrease in efficiency, there are potential safety hazards in operation, and it also leads to a significant increase in the processing and manufacturing costs of the customer's molten salt storage tank.

[0055] Solution: Adopt a double-suction impeller with the same parameters. The two suction ports divide the total flow of the pump equally. Without changing the head, the cavitation specific speed is reduced, reducing the risk of cavitation generated by the pump, and the radial size of the water pump is significantly reduced, effectively reducing the processing and manufacturing costs.

[0056] 5. In existing high-flow, low-head, high-temperature molten salt pumps, under the same parameters, their specific speed is relatively large and the blade inlet area is relatively small. There is a potential risk of cavitation in the impeller, which reduces the operating reliability of the molten salt pump and thus poses a safety hazard. Increasing the blade inlet area can increase the cavitation resistance performance. However, under the same parameters, to achieve this goal, it is inevitable that the radial dimension of the impeller will increase significantly, the overall size of the impeller will become larger, and the mass will increase, resulting in an increase in manufacturing cost and an increase in potential operating risks.

[0057] Solution: A double-suction impeller with the same parameters is used to match a newly designed spiral double-volute pump body. Compared with the traditional single-suction structure, the two suction inlets increase the inlet area without changing the radial dimension of the impeller, greatly improving the cavitation resistance performance of the pump, reducing the volume, significantly reducing the floor area of the pump unit, and greatly reducing the space occupancy ratio. It has a wide range of applications and can flexibly meet working conditions such as high flow and low head.

[0058] The application of the double-volute spiral pump body and the drain pipe assembly in the present utility model effectively avoids the prominent problems of existing products. Compared with existing products, it is compact in design, has a small installation space, is easy to operate, is safe and reliable in operation, has a small failure risk, improves the economic benefits of power station operation, and effectively avoids safety accidents such as shutdown and molten salt leakage.

[0059] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A high-flow and low-head high-temperature molten salt pump, characterized in that: The high-flow low-head high-temperature molten salt pump includes: a pump cover assembly, a lower guide bushing, a double-suction impeller, a pump body, a pump shaft, a drain pipe assembly, a sleeve coupling, a liquid-throwing disc, a sealing component, a base plate assembly, and a rolling bearing; The pump body volute is a double volute. The double-suction impeller is fixed on the pump shaft. The double-suction impeller, the lower guide bushing, the sleeve coupling, the liquid-throwing disc, the lower fan, the upper fan, the pump shaft, and the rolling bearing together form the rotor component of the pump; The double-suction impeller cooperates with the pump body. High-temperature molten salt is sucked in from both sides of the double-suction impeller and discharged from the pump body outlet after being boosted by the impeller. The drain pipe assembly includes a drain pipe and a support protection pipe; The support protection pipe of the drain pipe assembly and the pump shaft are both of sectional structures. The support protection pipes are connected by flanges. The pump shaft is connected by a sleeve coupling. The sleeve coupling and the guide bearing together form the guide bearing component of the pump; The suction port of the pump body is axially sucked from both sides, and the discharge port is spirally lifted eccentrically and then discharged axially. The center line of the pump body outlet is concentric with the drain pipe of the drain pipe assembly, and the centers of both coincide with the operating center line of the pump rotor component. The drain pipe assembly is fixed on the pump body; The liquid-throwing disc is installed below the sealing component, and the sealing component is installed on the base plate assembly.

2. The high-flow low-head high-temperature molten salt pump according to claim 1, wherein: One end of the double-suction impeller is positioned by the shaft shoulder of the pump shaft, and the other end is fixed on the pump shaft by the lower guide bushing and the locking nut.

3. The high-flow low-head high-temperature molten salt pump according to claim 1, wherein: The drain pipe assembly is connected to the pump body by flanges and bolts.

4. The high-flow low-head high-temperature molten salt pump according to claim 1, characterized in that: The pump cover assembly includes a suction end cover and a lower guide bearing. The inlet of the suction end cover is designed as a trumpet-shaped tapered type, and a spoiler partition is provided at the inlet of the trumpet-shaped tapered type.

5. The high-flow low-head high-temperature molten salt pump according to claim 1, wherein: The sealing assembly is connected to the upper side of the base plate assembly by studs.

6. The high-flow low-head high-temperature molten salt pump according to claim 1, characterized in that: The upper and lower parts of the rolling bearing are respectively provided with the upper fan and the lower fan mentioned above. The lower fan is located between the upper bearing component and the sealing component. An air guiding channel is designed on the base plate assembly, and large-area heat dissipation fins for increasing the heat dissipation efficiency are provided on the upper bearing assembly.

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