High temperature molten salt continuous transfer pump

Abstract

The application discloses a high-temperature molten salt continuous conveying pump, which comprises a pump body, a pump shaft, an impeller and a bottom plate, the pump shaft comprises a first driving shaft and a second driving shaft, a magnetic drive assembly is arranged between the first driving shaft and the second driving shaft, a cooling cavity is arranged between the pump shaft and the pump body, the magnetic drive assembly is arranged in the cooling cavity, a cooling medium flows in the cooling cavity and is used for cooling the magnetic drive assembly, the magnetic drive assembly comprises an outer magnetic rotor connected with the first driving shaft and an inner magnetic rotor connected with the second driving shaft, and an isolation sleeve is arranged between the inner magnetic rotor and the outer magnetic rotor to separate them. The molten salt is driven to be conveyed through magnetic force, the traditional sealing structure is cancelled under the premise that the molten salt does not leak, the overall structure is more simple, the support assembly is made of ceramic material, the service life of the molten salt pump can be greatly improved, and the maintenance cost and time are shortened.

Description

Technical Field

[0001] This application relates to the field of high-temperature medium transportation technology, and in particular to a high-temperature molten salt continuous transport pump. Background Technology

[0002] High-temperature molten salt continuous transfer pumps are special pumps designed for transporting salt media in a high-temperature molten state (such as molten nitrate salts, fluoride salts, etc., with operating temperatures typically ranging from 200℃ to 600℃ or even higher). Their core function is to achieve continuous, stable, and leak-free transport of molten salt in industrial systems. They are widely used in solar thermal power generation (molten salt thermal storage / heat exchange systems), chemical industry (high-temperature reaction processes), metallurgy, and other fields.

[0003] The existing molten salt pump with patent number CN200420026219.0 consists of components such as a pump cover, pump body, pump shaft, and impeller. The pump shaft, which connects to the impeller, is driven by a flexible coupling. This structure requires a sealing structure between the pump shaft and the pump body, which is not only complex, but also prone to seal failure after long-term use, leading to molten salt leakage, damage to core components such as bearings, and thus affecting the service life of the molten salt pump. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a high-temperature molten salt continuous transfer pump that eliminates the need for traditional sealing structures while ensuring no leakage of molten salt. This results in a simpler overall structure and significantly extends the service life of the molten salt pump. The technical solution adopted is as follows: A high-temperature molten salt continuous transport pump includes a pump body, a pump shaft, an impeller, and a base plate. The pump shaft includes a first drive shaft and a second drive shaft, and a magnetic drive assembly is provided between the first drive shaft and the second drive shaft. A cooling chamber is provided between the pump shaft and the pump body, and the magnetic drive assembly is disposed in the cooling chamber; a cooling medium flows in the cooling chamber for cooling the magnetic drive assembly. The magnetic drive assembly includes an outer magnetic rotor connected to the first drive shaft and an inner magnetic rotor connected to the second drive shaft, with an isolation sleeve separating the inner magnetic rotor and the outer magnetic rotor.

[0005] Preferably, the isolation sleeve divides the cooling cavity into cavity one and cavity two, with the inner magnetic rotor located in cavity two and the outer magnetic rotor located in cavity one.

[0006] Preferably, a support assembly is provided between the pump body and the pump shaft for rotatable connection, and the inner magnetic rotor abuts against the support assembly; The support assembly includes a first bearing assembly for supporting the first drive shaft and a second bearing assembly for supporting the second drive shaft.

[0007] More preferably, the support component is made of ceramic material.

[0008] More preferably, both the first bearing assembly and the second bearing assembly include a bearing housing and an axial limiting structure, as well as a rotating component disposed within the bearing housing, wherein the axial limiting structure abuts against the rotating component.

[0009] Preferably, a plurality of heating zones are provided between the pump body and the pump shaft, and the heating zones are located outside the second drive shaft.

[0010] Preferably, the isolation sleeve is made of silicon carbide ceramic.

[0011] Preferably, the pump body is made of a high-nickel alloy, and the inner wall of the pump body is coated with a ceramic coating or a nickel-based corrosion-resistant coating.

[0012] Compared with the prior art, the beneficial effects of this application are as follows: This application uses magnetic force to drive the delivery of molten salt. While ensuring that the molten salt does not leak, the traditional sealing structure is eliminated. The support components are made of ceramic materials, which can achieve self-lubricating operation in the molten salt medium without the need for external lubricating oil. The overall structure is simpler, which can greatly improve the service life of the molten salt pump, while reducing maintenance costs and time. Attached Figure Description

[0013] Figure 1 This is a structural diagram of this application.

[0014] In the picture: 10. Pump body; 20. Pump shaft; 21. First drive shaft; 22. Second drive shaft; 30. Magnetic drive assembly; 31. External magnetic rotor; 32. Internal magnetic rotor; 33. Isolation sleeve; 40, Support assembly; 41, First bearing assembly; 42, Second bearing assembly; 50. Cooling chamber; 51. Chamber 1; 52. Chamber 2; 60. Heating zone; 70. Coupling; 80. Base plate; 90. Impeller. Detailed Implementation

[0015] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0016] See Figure 1The following is a further detailed description of this application: A high-temperature molten salt continuous conveying pump for conveying high-temperature molten salt includes a pump body 10, a pump shaft 20, an impeller 90, and a base plate 80. The pump body 10 is connected to the base plate 80, and the pump shaft 20 is rotatably connected inside the pump body 10. The bottom end of the pump body 10 is provided with a conveying chamber for placing the impeller 90. The impeller 90 is connected to the pump shaft 20, and the top end of the pump shaft 20 is connected to a drive assembly via a flexible coupling 70. The drive assembly can be a high-temperature resistant motor. The above parts belong to the prior art and will not be described in detail here.

[0017] In this embodiment, the pump shaft 20 includes a first drive shaft 21 and a second drive shaft 22; wherein, the first drive shaft 21 is connected to the drive assembly, the second drive shaft 22 is connected to the impeller 90, and a magnetic drive assembly 30 is provided between the first drive shaft 21 and the second drive shaft 22.

[0018] A sealed cooling chamber 50 is provided between the pump shaft 20 and the pump body 10, and the magnetic drive assembly 30 is disposed within the cooling chamber 50. A cooling medium flows within the cooling chamber 50 to cool and reduce the temperature of the magnetic drive assembly 30, preventing the magnetic drive assembly 30 from overheating and thus ensuring the reliability of the magnetic drive assembly 30's transmission. The cooling chamber 50 can be supplied with a cooling medium through a circulating pump. The cooling medium can be cooling water, as long as it can cool the magnetic drive assembly 30; there are no restrictions on this.

[0019] The magnetic drive assembly 30 includes an outer magnetic rotor 31 connected to the first drive shaft 21 and an inner magnetic rotor 32 connected to the second drive shaft 22. An isolation sleeve 33 separates the inner magnetic rotor 32 from the outer magnetic rotor 31. Contactless power transmission is achieved between the outer magnetic rotor 31 and the inner magnetic rotor 32 through magnetic field coupling. The isolation sleeve 33 is made of silicon carbide ceramic, which prevents the isolation sleeve 33 from being magnetized, ensuring stable transmission of the magnetic coupling force between the outer magnetic rotor 31 and the inner magnetic rotor 32. Compared to existing technologies, this application eliminates the traditional sealing structure while ensuring no leakage of molten salt. Therefore, the overall structure of the molten salt pump is simpler, greatly improving its service life.

[0020] In this embodiment, the isolation sleeve 33 divides the cooling chamber 50 into a first chamber 51 for housing the outer magnetic rotor 31 and a second chamber 52 for housing the inner magnetic rotor 32. The cooling medium flows within the first chamber 51. In an embodiment not shown, the cooling medium may flow within both the first chamber 51 and the second chamber 52.

[0021] The pump shaft 20 is rotatably connected to the pump body 10; wherein, a support assembly 40 is provided between the pump body 10 and the pump shaft 20 for rotatable connection, the support assembly 40 being used to support the pump shaft 20 to rotate within the pump body 10; the inner magnetic rotor 32 abuts against and seals the support assembly 40; the support assembly 40 includes at least one first bearing assembly 41 and at least one second bearing assembly 42 for supporting the rotation of the second drive shaft 22, the first bearing assembly 41 being used to support the rotation of the first drive shaft 21.

[0022] Both the first bearing assembly 41 and the second bearing assembly 42 include a bearing housing and an axial limiting structure, as well as a rotating component disposed within the bearing housing. The axial limiting structure abuts against the rotating component. The rotating component may be a bearing or a wear ring, etc. The axial limiting structure may be a limiting cover plate. In this embodiment, the support assembly 40 is made of ceramic material. Preferably, the support assembly 40 is made of silicon nitride and silicon carbide composite ceramic material, which can achieve self-lubricating operation in molten salt medium without the need for external lubricating oil. Compared with the use of traditional bearings, this application can greatly reduce maintenance costs and time.

[0023] In this embodiment, a plurality of heating zones 60 are further provided between the pump body 10 and the pump shaft 20, and the heating zones 60 are located outside the second drive shaft 22. Specifically, the heating zones 60 are located in the area between the cooling chamber 50 and the impeller 90. The heating zones 60 are used to heat the pump body 10, which can effectively prevent the molten salt in the area between the cooling chamber 50 and the impeller 90 from solidifying; heating can be achieved by arranging heating components on the outer wall of the pump body to ensure that the temperature in the heating zone is stable at 350℃–500℃.

[0024] The inner magnetic rotor 32 abuts against the support assembly 40; wherein, the inner magnetic rotor 32 abuts against the axial limiting structure in the second bearing assembly 42, so that the cavity 52 forms a sealed cavity; the inner magnetic rotor 32 can directly or indirectly abut against the axial limiting structure through a heat insulation component.

[0025] In this embodiment, the pump body 10 is made of high-nickel alloy, and the inner wall of the pump body 10 is coated with a ceramic coating or a nickel-based corrosion-resistant coating that is resistant to molten salt corrosion, so as to ensure that the pump body 10 can operate reliably for a long time in a high-temperature molten salt environment.

Claims

1. A high-temperature molten salt continuous transfer pump, comprising a pump body, a pump shaft, an impeller, and a base plate, characterized in that: The pump shaft includes a first drive shaft and a second drive shaft, and a magnetic drive assembly is provided between the first drive shaft and the second drive shaft; A cooling chamber is provided between the pump shaft and the pump body, and the magnetic drive assembly is disposed in the cooling chamber; a cooling medium flows in the cooling chamber for cooling the magnetic drive assembly. The magnetic drive assembly includes an outer magnetic rotor connected to the first drive shaft and an inner magnetic rotor connected to the second drive shaft, with an isolation sleeve separating the inner magnetic rotor and the outer magnetic rotor.

2. The high-temperature molten salt continuous conveying pump according to claim 1, characterized in that: The isolation sleeve divides the cooling cavity into cavity one and cavity two. The inner magnetic rotor is located in cavity two, and the outer magnetic rotor is located in cavity one.

3. The high-temperature molten salt continuous conveying pump according to claim 1, characterized in that: A support assembly is provided between the pump body and the pump shaft for rotatable connection, and the inner magnetic rotor abuts against the support assembly; The support assembly includes a first bearing assembly for supporting the first drive shaft and a second bearing assembly for supporting the second drive shaft.

4. The high-temperature molten salt continuous conveying pump according to claim 3, characterized in that: The support component is made of ceramic material.

5. The high-temperature molten salt continuous conveying pump according to claim 3, characterized in that: Both the first bearing assembly and the second bearing assembly include a bearing housing and an axial limiting structure, as well as a rotating component disposed within the bearing housing, wherein the axial limiting structure abuts against the rotating component.

6. The high-temperature molten salt continuous conveying pump according to claim 1, characterized in that: Several heating zones are also provided between the pump body and the pump shaft, and the heating zones are located outside the second drive shaft.

7. The high-temperature molten salt continuous conveying pump according to claim 1, characterized in that: The isolation sleeve is made of silicon carbide ceramic.

8. The high-temperature molten salt continuous conveying pump according to claim 1, characterized in that: The pump body is made of high-nickel alloy, and the inner wall of the pump body is coated with a ceramic coating or a nickel-based corrosion-resistant coating.

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