High temperature molten salt pump with flexible outlet tube connection

Abstract

The utility model relates to the technical field of fused salt pump provides an outlet pipe flexible connection's high temperature fused salt pump, include: shaft, upper support pipe, lower support pipe, outlet pipe, pump body, impeller and guide vane, the upper support pipe is fixedly connected with lower support pipe, the bottom of lower support pipe is connected with pump body, the axial setting shaft of upper support pipe and lower support pipe, the bottom of shaft is equipped with impeller, the output direction one side of impeller is equipped with guide vane, the outlet pipe is inserted in lower support pipe, the bottom outer wall of outlet pipe sets up multiple guide tenon groove, the lower support pipe sets up multiple groove structure in the inner wall position of corresponding guide tenon groove, the utility model utilizes the feature of tenon groove structure, effectively eliminated fluid turbulence, produces pressure pulsation dispersion, makes pressure fluctuation relative dislocation, reduces the risk of resonance, increases the service life of high temperature fused salt pump.

Description

Technical Field

[0001] This utility model relates to the field of molten salt pump technology, and in particular to a high-temperature molten salt pump with a flexible outlet pipe connection. Background Technology

[0002] In recent years, the development of high-temperature molten salt pumps has been rapid. These pumps can withstand high temperatures and pressures, and their pump bodies are made of corrosion-resistant alloy steel, enabling them to withstand high-temperature operating conditions. They are industrial equipment specifically designed for conveying molten salts at temperatures ranging from 400℃ to 700℃. They also possess high-pressure conveying capabilities, reaching up to 100 bar, and are suitable for high-viscosity molten salts, which traditional pumps struggle to meet. High-temperature molten salt pumps have numerous applications in various fields; in concentrated solar power (CSP), they serve as core equipment in molten salt energy storage systems, handling the circulation of the heat transfer medium; in nuclear power, they are used for conveying molten salt media in reactor cooling systems; and in chemical production, they are used in high-temperature molten salt chemical processes involving nitrates, fluorides, and other chemicals.

[0003] However, the existing high-temperature molten salt pump structure suffers from excessively small radial clearance between the impeller outlet and the guide vane leading edge, leading to high-frequency vibration caused by water flow impacting the tongue. Furthermore, high-temperature molten salt pumps typically employ a long shaft design, which, due to deflection, results in insufficient rigidity, causing friction between the rotor and stator components and exacerbating fluid turbulence. Fluid turbulence easily leads to cumulative fatigue damage in metal components (such as pipes and impellers), accelerating crack propagation and even fracture (especially at welded or flanged connections); vibration causes dynamic changes in the dynamic and static seal clearances, increasing seal wear and leakage risks; bearings experience abnormal temperature rises due to abnormal loads, shortening their lifespan by more than 30%; turbulent flow impacts the equipment surface, inducing cavitation and forming honeycomb-like pits, while simultaneously accelerating the wear and failure of flow-through components, among other problems. Utility Model Content

[0004] This invention primarily addresses the technical problems of existing high-temperature molten salt pumps, which are prone to fluid turbulence due to structural issues. These problems lead to pump body vibration, increased wear and leakage risks of seals, abnormal temperature rise of bearings due to abnormal loads, and shortened service life. The invention proposes a high-temperature molten salt pump with a flexible outlet pipe connection. By utilizing the characteristics of the tenon and groove structure, fluid turbulence is effectively eliminated, pressure pulsation is dispersed, pressure fluctuations are relatively misaligned, resonance risks are reduced, and the service life of the high-temperature molten salt pump is increased.

[0005] This utility model provides a high-temperature molten salt pump with flexible outlet pipe connection, including: shaft, upper support pipe, lower support pipe, outlet pipe, pump body, impeller and guide vane;

[0006] The upper support pipe and the lower support pipe are fixedly connected; the bottom end of the lower support pipe is connected to the pump body;

[0007] The upper and lower support tubes are axially arranged with shafts; an impeller is mounted at the bottom end of the shaft; and a guide vane is mounted on the output side of the impeller.

[0008] An outlet pipe is inserted into the lower support tube; multiple guide grooves are provided on the outer wall of the bottom end of the outlet pipe;

[0009] The lower support tube has a multi-groove structure on its inner wall at the position corresponding to the guide tenon groove.

[0010] Preferably, the upper support tube is fixedly connected to the lower support tube via a base plate.

[0011] Preferably, the side wall of the upper support tube has a circular hole, and the outlet tube is inserted into the upper support tube through the circular hole and welded together with the upper support tube.

[0012] Preferably, a stuffing box is provided at the top of the upper support tube for the shaft;

[0013] The packing box is filled with packing material for sealing, and the packing box is pressed tightly by a packing gland.

[0014] Preferably, a bearing bracket is provided above the stuffing box for the shaft;

[0015] The bearing bracket is provided with a pair of first bearings and a second bearing, and the shaft is supported by the first bearings and the second bearing.

[0016] Preferably, the first bearing is an angular contact ball bearing and the second bearing is a round roller bearing.

[0017] Preferably, the impeller is fixed to the bottom end of the shaft by an impeller nut.

[0018] Preferably, the multi-slot structure adopts an irregular multi-slot structure.

[0019] This invention provides a high-temperature molten salt pump with a flexible outlet pipe connection. A guide groove is machined on the outer side of the bottom of the outlet pipe, and an irregular multi-groove structure is machined on the inner side of the lower support pipe. The outlet pipe is located inside the lower support pipe, and the guide groove and multi-groove structure are flexibly connected, making installation and operation simple and convenient. This invention utilizes the characteristics of the groove structure to effectively eliminate fluid turbulence. When fluid-induced vibration occurs, the irregular groove structure avoids resonance, disperses pressure pulsations, and relatively misaligns pressure fluctuations, reducing the risk of resonance. It also prevents fatigue damage to components, slows crack propagation at welded areas and flange connections, prevents breakage, reduces the risk of seal wear and leakage, increases bearing life, eliminates cavitation induced by turbulent flow impacts on equipment surfaces, and slows wear failure of flow-through components, thus extending the service life of the high-temperature molten salt pump. Attached Figure Description

[0020] Figure 1This is an axial sectional view of the high-temperature molten salt pump with flexible outlet pipe connection provided by this utility model;

[0021] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0022] Reference numerals in the attached drawings: 1. Bearing bracket; 2. Packing gland; 3. Packing box; 4. Upper support pipe; 5. Lower support pipe; 6. Guide vane; 7. Pump body; 8. First bearing; 9. Packing seal; 10. Outlet pipe; 11. Base plate; 12. Shaft; 13. Impeller; 14. Impeller nut; 15. Guide tenon; 16. Multi-groove structure; 17. Second bearing. Detailed Implementation

[0023] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0024] like Figure 1-2 As shown in the figure, a high-temperature molten salt pump with flexible outlet pipe connection provided by this utility model embodiment includes: shaft 12, upper support pipe 4, lower support pipe 5, outlet pipe 10, pump body 7, impeller 13 and guide vane 6.

[0025] The upper support pipe 4 and the lower support pipe 5 are fixedly connected. Specifically, the upper support pipe 4 is fixedly connected to the lower support pipe 5 through a base plate 11. The upper support pipe 4 is fixed on the base plate 11, which is used to fix it to the ground. The lower support pipe 5 is fixed to the bottom of the base plate 11 with bolts. The bottom end of the lower support pipe 5 is fixedly connected to the pump body 7 with bolts, which serves to fix the pump body 7. The lower end of the pump body 7 is the pump inlet, through which the medium enters the interior of the molten salt pump.

[0026] The upper support pipe 4 and the lower support pipe 5 are axially connected to a shaft 12. An impeller 13 is mounted at the bottom end (non-driving end) of the shaft 12; specifically, the impeller 13 is fixed to the bottom end of the shaft 12 by an impeller nut 14. A guide vane 6 is mounted on the output direction side of the impeller 13; the guide vane 6 is fixed to the pump body 7. The guide vane 6 has multiple flow channels, which can reduce the flow velocity, convert kinetic energy into pressure energy, and guide the fluid out.

[0027] An outlet pipe 10 is inserted into the lower support pipe 5. Specifically, a circular hole is opened in the side wall of the upper support pipe 4, and the outlet pipe 10 is inserted into the upper support pipe 4 through the circular hole and welded to the upper support pipe 4. Multiple guide tenons 15 are provided on the outer wall of the bottom end of the outlet pipe 10; a multi-groove structure 16 is provided on the inner wall of the lower support pipe 5 at positions corresponding to the guide tenons 15. The multi-groove structure 16 adopts an irregular multi-groove structure. The outlet pipe 10 is inside the lower support pipe 5, and the guide tenons 15 and the multi-groove structure 16 are flexibly connected. The outlet pipe 10 can be made of 304 stainless steel.

[0028] Based on the above scheme, a stuffing box 3 is provided on the top of the upper support pipe 4 of the shaft 12; the stuffing box 3 is filled with a packing seal 9, and the stuffing box 3 is pressed tightly by a packing gland 2. The packing gland 2 is fixed to the stuffing box 3 with bolts, and the stuffing box 3 is fixed to the upper support pipe 4 with bolts.

[0029] Furthermore, a bearing bracket 1 is provided above the stuffing box 3 for the shaft 12; a pair of first bearings 8 and a second bearing 17 are provided inside the bearing bracket 1, and the shaft 12 is supported by the first bearings 8 and the second bearing 17. The first bearings 8 are angular contact ball bearings, and the second bearing 17 is a round roller bearing.

[0030] The working principle of a high-temperature molten salt pump with a flexible outlet pipe provided by this utility model is as follows: When the high-temperature molten salt pump is working, the fluid enters the pump through the inlet of the pump body 7, then enters the inlet of the impeller 13, and is thrown out from the outlet of the impeller 13 into the guide vane 6 by the rotation of the shaft 12, and finally flows to the outlet pipe 10 of the high-temperature molten salt pump and flows out from the outlet of the outlet pipe 10. By designing the outlet pipe 10 as a flexible connection and through the cooperation between the guide tenon 15 and the irregular multi-groove structure 16, fluid turbulence can be effectively eliminated. When the fluid induces vibration, the tenon structure can avoid resonance, disperse pressure pulsation, and make the pressure fluctuation relatively misaligned, reducing the risk of resonance.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature molten salt pump with a flexible outlet pipe connection, characterized in that, include: Shaft (12), upper support pipe (4), lower support pipe (5), outlet pipe (10), pump body (7), impeller (13) and guide vane (6); The upper support pipe (4) and the lower support pipe (5) are fixedly connected; the bottom end of the lower support pipe (5) is connected to the pump body (7); The upper support tube (4) and the lower support tube (5) are axially provided with shafts (12); the bottom end of the shaft (12) is equipped with an impeller (13); the output direction side of the impeller (13) is equipped with guide vanes (6). An outlet pipe (10) is inserted into the lower support pipe (5); multiple guide grooves (15) are provided on the outer wall of the bottom end of the outlet pipe (10). The lower support tube (5) has a multi-groove structure (16) on its inner wall at the position corresponding to the guide tenon (15).

2. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1, characterized in that, The upper support tube (4) is fixedly connected to the lower support tube (5) through the base plate (11).

3. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1 or 2, characterized in that, The upper support tube (4) has a circular hole on its side wall, and the outlet tube (10) is inserted into the upper support tube (4) through the circular hole and welded together with the upper support tube (4).

4. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1, characterized in that, The shaft (12) has a stuffing box (3) on top of the upper support tube (4); The packing box (3) is filled with packing seal (9), and the packing box (3) is pressed by the packing gland (2).

5. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1, characterized in that, The shaft (12) is provided with a bearing bracket (1) above the stuffing box (3); The bearing bracket (1) is provided with a pair of first bearings (8) and a second bearing (17), and the shaft (12) is supported by the first bearings (8) and the second bearings (17).

6. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 5, characterized in that, The first bearing (8) is an angular contact ball bearing, and the second bearing (17) is a round roller bearing.

7. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1, characterized in that, The impeller (13) is fixed to the bottom end of the shaft (12) by an impeller nut (14).

8. The high-temperature molten salt pump with flexible outlet pipe connection according to claim 1, characterized in that, The multi-slot structure (16) adopts an irregular multi-slot structure.

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