Vertical immersion high-temperature molten salt delivery pump with lubrication system

Abstract

The application discloses a vertical immersed high-temperature molten salt conveying pump with a lubricating system, belongs to the technical field of new energy molten salt heat storage, and comprises a driving device, the output end of the driving device is connected with a spline shaft coupling, the other end of the spline shaft coupling is connected with a screw rod, the screw rod is provided with spiral blades, the outer side of the spiral blades is sleeved with a pump shell, the pump adopts a sectional structure, axial pressure of the whole screw rod is decomposed and is borne by multiple pressure bearings, so that the axial stress of each pressure bearing is reduced. Meanwhile, the axial expansion amount of the whole screw rod is decomposed and is offset by multiple spline shaft couplings, so that the displacement amount of the sealing element at the top screw rod extension part of the pump and the bearing end cover is reduced, and the sealing performance is improved; the lubricating system controller obtains bearing temperature data and a change trend of each bearing through calculation on the basis of nitrogen temperature data of each return pipe, and then transmits control data to a graphite regulating valve to control the graphite content in nitrogen, so that the bearing can be better lubricated, bearing wear is reduced, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy molten salt heat storage, and particularly relates to a vertical immersed high-temperature molten salt conveying pump with a lubricating system. BACKGROUND

[0002] The molten salt conveyed by the high-temperature molten salt pump is in a high-temperature state, and the temperature can reach 800 DEG C. Some of the conveyed molten salts are also corrosive. Therefore, the requirements for the molten salt pump are relatively harsh. However, the existing high-temperature molten salt pump has the following four problems:

[0003] 1: High-temperature thermal expansion problem. Different materials have different thermal expansion coefficients. When the temperature changes greatly (when starting and stopping), the mutual matching parts will have a large gap or serious interference, which will deform and damage the pump body structure and affect the service life of the pump.

[0004] 2: Sealing reliability under high temperature. The sealing between the impeller and the pump shell is mainly referred to. When the gap between the impeller and the pump shell is too large due to uneven expansion, the internal leakage of the pump increases, the pump output decreases, and the pump vibration and noise increase.

[0005] 3: Lubrication of the bearing in the pump body. The high-speed rotating bearing works at high temperature and high speed for a long time and cannot be lubricated in time, which causes serious wear and reduces the service life.

[0006] 4: Inconvenient installation and disassembly. The existing system mostly uses a centrifugal pump, and the centrifugal pump body is installed at the bottom of the molten salt tank. When the pump needs to be repaired and maintained, the centrifugal pump body is large in size and is provided with a driving shaft and a driving shaft sleeve assembly and a pump outlet pipe, so that the pump disassembly and installation process is difficult.

[0007] According to the published application CN201610076520.X, a functional graphene composite molten salt and a preparation method thereof are provided.

[0008] Three series of molten salt composites were prepared by adding different amounts of graphene oxide (GO), sodium-functionalized graphene (Na-GO) and potassium-functionalized graphene (K-GO) into molten salts composed of potassium nitrate, sodium nitrate and lithium nitrate. The effects of the content of functionalized graphene and the oxidation, sodium functionalization and potassium functionalization on the melting point, thermal decomposition temperature, thermal conductivity and viscosity of the molten salt composites were investigated. The results show that, within the range of 0.1% to 5% of the added amount, the melting point of the molten salt composite gradually decreases first and then gently decreases with the increase of the added amount of functionalized graphene, and the Na-GO has the most obvious effect on the decrease of the melting point of the molten salt. The initial decomposition temperature of the molten salt composite increases with the increase of the added amount of functionalized graphene. The addition of GO, Na-GO and K-GO improves the thermal conductivity of the molten salt composite and reduces its flow performance. Considering various factors, the molten salt composite obtained by adding 0.5% to 1% of Na-GO in the molten salt has better comprehensive performance.

[0009] The application provides a functionalized graphene composite molten salt and a preparation method thereof. The functionalized graphene composite molten salt comprises functionalized graphene and molten salt, and the mass ratio of the functionalized graphene to the molten salt is 01:100-20:100. The preparation method of the functionalized graphene composite molten salt comprises the following steps: (1) adding graphene oxide into deionized water for ultrasonic dispersion, adding a hydroxide aqueous solution, and separating functionalized graphene after reaction; (2) heating and mixing molten salt and the functionalized graphene according to the mass ratio; and (3) cooling to obtain the functionalized graphene composite molten salt. The functionalized graphene composite molten salt prepared by the application has high thermal conductivity, high heat storage density, simple preparation process and low production cost.

[0010] The application provides a functionalized graphene composite molten salt, which comprises functionalized graphene and molten salt, and the functionalized graphene and the molten salt are mixed according to a certain mass ratio. The molten salt is a nitric acid mixed salt, and the functionalized graphene is graphene oxide or metal-functionalized graphene oxide. The functionalized graphene composite molten salt provided by the application has obvious improvement in molten salt performance compared with other molten salts, for example, nitrate, graphene-based molten salt and metal-based molten salt, has the advantages of high thermal conductivity, high heat storage density, good comprehensive performance and recyclability and the like. The functionalized graphene composite molten salt provided by the application can be applied to the technical fields of solar photo-thermal power generation and solar hydrogen production.

[0011] The above application shows that a small amount of graphite mixed into molten salt does not have a negative effect on the performance of the molten salt. SUMMARY

[0012] The technical problem to be solved by the application is that long-term high-speed operation of equipment causes serious wear and tear and reduces the service life.

[0013] To achieve the above object, the technical scheme adopted by the present application is:

[0014] The vertical immersed high-temperature molten salt conveying pump with a lubricating system comprises a driving device, the output end of the driving device is connected with a spline shaft coupling, the other end of the spline shaft coupling is connected with a screw rod, the screw rod is provided with helical blades, the outer side of the helical blades is sleeved with a pump shell, the screw rod comprises a high-pressure section screw rod, a medium-pressure section screw rod and a low-pressure section screw rod, the helical blades comprise high-pressure section helical blades, medium-pressure section helical blades and low-pressure section helical blades, the high-pressure section screw rod, the medium-pressure section screw rod and the low-pressure section screw rod are connected through spline shaft couplings, bearings, bearing sleeves and bearing pressing plates, the high-pressure section screw rod, the medium-pressure section screw rod and the low-pressure section screw rod are respectively provided with the high-pressure section helical blades, the medium-pressure section helical blades and the low-pressure section helical blades, the pump shell is provided with a flange, the bearings comprise axial and radial composite bearings and radial bearings, the axial and radial composite bearings are arranged at the low-pressure end, the axial and radial composite bearings are provided with graphite-nitrogen mixed lubricating material inlets and graphite-nitrogen mixed lubricating material outlets, the radial bearings are arranged at the high-pressure end, the radial bearings are provided with graphite-nitrogen mixed lubricating material inlets and graphite-nitrogen mixed lubricating material outlets, and the graphite-nitrogen mixed lubricating material inlets and the graphite-nitrogen mixed lubricating material outlets are connected with bearing lubricating systems.

[0015] The flange comprises a mounting flange, a flange plate, a high-pressure end flange plate and a low-pressure end flange plate.

[0016] The inner side of the connecting end of the pump shell is provided with a groove, an internal thread is arranged in the groove, an external thread is arranged on the outer wall of the bearing sleeve and the bearing pressing plate, the bearing sleeve and the bearing pressing plate are threadedly connected with the pump shell, one side of the bearing pressing plate is provided with a locking ring, and the locking ring is threadedly connected with the pump shell.

[0017] The inside of the bearing sleeve is provided with a bearing, one end of the bearing sleeve is provided with a sealing ring sleeve, a sealing ring mounting groove is arranged in the inside of the sealing ring sleeve, and a sealing ring is arranged in the sealing ring mounting groove.

[0018] The top end of the pump shell is provided with a flange plate, the outer side of the flange plate is provided with a cover plate, the outer side of the cover plate is fixedly connected with a bearing end cover, the inside of the bearing end cover is provided with a radial bearing, and the radial bearing is provided with a cooling liquid inlet and a cooling liquid outlet.

[0019] The bottom end of the pump shell is provided with a terminal positioning hole and a terminal positioner, the inside of the bottom end of the pump shell is provided with a radial bearing, and the radial bearing is provided with a graphite-nitrogen mixed lubricating liquid inlet and a graphite-nitrogen mixed lubricating liquid outlet.

[0020] The outer edge of the helical blade in contact with the pump shell is provided with a mounting groove, and the inside of the mounting groove is provided with a helical sealing ring.

[0021] The mounting bracket is arranged on the pump shell.

[0022] The bearing lubrication system comprises a lubrication cooling microcomputer control device, a nitrogen storage tank, an ultra-fine graphite storage device, an ultra-fine graphite filtering device, a solid-gas separation device, a nitrogen filtering device, a thermometer, a plurality of pressure regulating valves, a plurality of pressure gauges and a plurality of thermometers, wherein the plurality of pressure regulating valves, the plurality of pressure gauges and the plurality of thermometers are connected with the lubrication cooling microcomputer control device.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The pump adopts a segmented structure, the axial pressure of the whole screw rod is decomposed and shared by a plurality of pressure bearings, the axial force of a single pressure bearing is reduced, the axial expansion displacement of the whole screw rod is decomposed and shared by a plurality of spline couplings, the displacement of the part of the screw rod extending out of the pump and the sealing element at the bearing end cover is reduced, and the sealing performance is improved.

[0025] The lubrication system controller is connected to the graphite-nitrogen mixed lubricating material inlet and outlet, each bearing can be fully lubricated, the lubrication system controller calculates the temperature data of each bearing and the change trend, and then transmits the control data to the graphite adjusting valve to control the graphite content in the nitrogen, so that each bearing can be better lubricated, the bearing wear is reduced, and the service life of the equipment is prolonged.

[0026] The pump adopts a segmented structure, and the segmented construction is adopted during installation and disassembly, so that the construction difficulty is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a cross-sectional structure schematic diagram of the embodiment of the present application.

[0028] Figure 2 is an end cover structure schematic diagram of the embodiment of the present application.

[0029] Figure 3 is an axial-radial composite bearing and radial bearing structure schematic diagram of the embodiment of the present application.

[0030] Figure 4 is a spiral blade sealing ring structure schematic diagram of the embodiment of the present application.

[0031] Figure 5 is a bearing lubrication system schematic diagram of the embodiment of the present application.

[0032] Figure No. and Name: spline coupling 1, high pressure section screw 2, high pressure section spiral blade 3, pump shell 4, mounting flange 5, mounting bracket 6, axial and radial composite bearing 7, radial bearing 8, graphite and nitrogen mixed lubricant inlet 9, graphite and nitrogen mixed lubricant outlet 10, sealing ring sleeve 13, sealing ring 14, sealing ring mounting groove 15, locking ring 18, low pressure end flange plate 28, high pressure end flange plate 29, low pressure section screw 30, bearing pressing plate 42, medium pressure section screw 49, medium pressure section spiral blade 50, bearing sleeve 51, low pressure section spiral blade 52, end positioning hole 54, end positioner 55, cooling liquid inlet 56, bearing end cover 57, cooling liquid outlet 58, cover plate 59, flange plate 60, mounting groove 62, spiral sealing ring 63. DETAILED DESCRIPTION

[0033] The present application will be described in detail below with reference to the drawings and specific embodiments, which are intended to explain the present application, but not as a limitation to the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0035] Example 1

[0036] As Figures 1-5The vertical high-temperature molten salt conveying pump with a lubricating system comprises a driving device, the output end of the driving device is connected with a spline shaft coupling 1, the other end of the spline shaft coupling 1 is connected with a screw rod, the screw rod is provided with spiral blades, the outer side of the spiral blades is sleeved with a pump shell 4, the screw rod comprises a high-pressure section screw rod 2, a medium-pressure section screw rod 49 and a low-pressure section screw rod 30, the spiral blades comprise high-pressure section spiral blades 3, medium-pressure section spiral blades 50 and low-pressure section spiral blades 52, the high-pressure section screw rod 2, the medium-pressure section screw rod 49 and the low-pressure section screw rod 30 are connected through the spline shaft coupling 1, bearings, bearing sleeves 51 and bearing pressing plates 42, the high-pressure section screw rod 2, the medium-pressure section screw rod 49 and the low-pressure section screw rod 30 are respectively provided with the high-pressure section spiral blades 3, the medium-pressure section spiral blades 50 and the low-pressure section spiral blades 52, the pump shell 4 is provided with flanges, the bearings comprise axial and radial composite bearings 7 and radial bearings 8, the axial and radial composite bearings 7 are arranged at the low-pressure end, the axial and radial composite bearings 7 are provided with graphite-nitrogen mixed lubricating liquid inlets 9 and graphite-nitrogen mixed lubricating liquid outlets 10, the radial bearings 8 are arranged at the high-pressure end, the radial bearings 8 are provided with graphite-nitrogen mixed lubricating liquid inlets 9 and graphite-nitrogen mixed lubricating liquid outlets 10, the graphite-nitrogen mixed lubricating liquid inlets 9 and the graphite-nitrogen mixed lubricating liquid outlets 10 are connected with bearing lubricating systems, the flanges comprise mounting flanges 5, flange plates 60, high-pressure end flange plates 29 and low-pressure end flange plates 28, the inner side of the connecting end of the pump shell 4 is provided with a groove, the groove is provided with internal threads, the outer walls of the bearing sleeves 51 and the bearing pressing plates 42 are provided with external threads, the bearing sleeves 51 and the bearing pressing plates 42 are threadedly connected with the pump shell 4, one side of the bearing pressing plate 42 is provided with a locking ring 18, the locking ring 18 is threadedly connected with the pump shell 4, the inside of the bearing sleeve 51 is provided with a bearing, one end of the bearing sleeve 51 is provided with a sealing ring sleeve 13, the inside of the sealing ring sleeve 13 is provided with a sealing ring mounting groove 15, the sealing ring mounting groove 15 is provided with a sealing ring 14, the top end of the pump shell 4 is provided with a flange plate 60, the outer side of the flange plate 60 is provided with a cover plate 59, the outer side of the cover plate 59 is fixedly connected with a bearing end cover 57, the inside of the bearing end cover 57 is provided with a radial bearing 8, the radial bearing 8 is provided with a cooling liquid inlet 56 and a cooling liquid outlet 58, the bottom end of the pump shell 4 is provided with a terminal positioning hole 54 and a terminal positioner 55, the inside of the bottom end of the pump shell 4 is provided with a radial bearing 8, the radial bearing 8 is provided with a graphite-nitrogen mixed lubricating liquid inlet 9 and a graphite-nitrogen mixed lubricating liquid outlet 10, the outer edge of the spiral blades in contact with the pump shell 4 is provided with a mounting groove 62, the inside of the mounting groove 62 is provided with a spiral sealing ring 63, the pump shell 4 is fixedly connected with mounting brackets 6, the mounting brackets 6 are provided with the mounting flanges 5.The bearing lubrication system comprises a lubrication and cooling microcomputer control device, a nitrogen storage tank, an ultra-fine graphite storage device, an ultra-fine graphite filtering device, a solid-gas separation device, a nitrogen filtering device, a thermometer, a plurality of pressure regulating valves and a plurality of pressure gauges and a plurality of thermometers, wherein the plurality of pressure regulating valves, the plurality of pressure gauges and the plurality of thermometers are connected with the lubrication and cooling microcomputer control device.

[0037] The pump body is divided into a high-pressure section, a medium-pressure section and a low-pressure section, corresponding to the high-pressure section screw rod 2, the medium-pressure section screw rod 49, the low-pressure section screw rod 30, the high-pressure section spiral blade 3, the medium-pressure section spiral blade 50 and the low-pressure section spiral blade 52, respectively. An axial and radial composite bearing 7 is arranged in the bearing sleeve 51 on the low-pressure end side of the connection between the high-pressure section screw rod 2, the medium-pressure section screw rod 49 and the low-pressure section screw rod 30. A radial bearing 8 is arranged in the bearing sleeve 51 on the high-pressure end side. The graphite-nitrogen mixed lubricating material inlet 9 and the graphite-nitrogen mixed lubricating material outlet 10 are connected with the lubrication system controller.

[0038] The high-temperature molten salt pump is vertically installed in the molten salt tank. The driving device is connected with the shaft coupling to drive the screw rod to rotate. The blade sucks the high-temperature molten salt from the feed inlet at the bottom of the pump into the pump. The blade rotates to continuously press the molten salt on the upper blade to increase the pressure and send it to the pump outlet. After the pressure is adjusted by the pressure regulating valve, the molten salt is transported to the conveying pipeline.

[0039] The nitrogen in the nitrogen storage tank is compressed by the nitrogen compressor and enters the graphite-nitrogen mixture main pipe after being adjusted by the pressure regulating valve F. The ultra-fine graphite powder in the ultra-fine graphite storage device enters the graphite-nitrogen mixture main pipe after being adjusted by the pressure regulating valve G. The ultra-fine graphite powder and nitrogen are mixed and enter the graphite-nitrogen mixture branch pipes. After being adjusted by the branch pipe pressure regulating valves A, B, C, D and E, the graphite-nitrogen mixture enters the graphite-nitrogen mixture inlet pipe 9 of the bearing and then enters the bearing to lubricate the bearing. After that, the graphite-nitrogen mixture enters the outlet branch pipe and then enters the graphite-nitrogen mixture outlet main pipe. The graphite-nitrogen mixture in the graphite-nitrogen mixture outlet main pipe is separated by the solid-gas separation device. The graphite in the graphite-nitrogen mixture is filtered by the ultra-fine graphite filtering device and then reenters the ultra-fine graphite storage device. The nitrogen in the graphite-nitrogen mixture is filtered by the nitrogen filtering device and then reenters the nitrogen storage tank.

[0040] In the working process of the lubrication system, the lubrication cooling microcomputer control device controls the pressure of nitrogen in the graphite-nitrogen mixture inlet manifold through the measured signal of the graphite-nitrogen mixture inlet manifold pressure gauge 73 to control the pressure regulating valve F, controls the pressure and temperature of the graphite-nitrogen mixture outlet branch pipe through the pressure measuring signals 66 / 67 / 68 / 69 / 72 and the temperature measuring signals 74 / 75 / 76 / 77 / 78 of the graphite-nitrogen mixture outlet branch pipe, and controls the pressure regulating valve 7 through the pressure and temperature measuring values and change trends to control the graphite content in the graphite-nitrogen mixture inlet manifold, controls the opening degrees of the pressure regulating valves A / B / C / D / E on the graphite-nitrogen mixture inlet branch pipe, and controls the opening degrees of the pressure regulating valves H / I / J / K / L on the graphite-nitrogen mixture outlet branch pipe to adjust the nitrogen pressure and graphite content in each bearing to adjust the temperature of each bearing and make the nitrogen pressure slightly larger than the pressure of the molten salt at the position of each bearing so that the molten salt cannot enter the bearing.

[0041] The pressure sensor between the molten salt pump outlet and the pressure regulating valve transmits the pump outlet pressure data to the lubrication system controller and transmits the nitrogen temperature data of the nitrogen backflow pipe of each bearing to the lubrication system controller, the lubrication system controller calculates the pressure of the molten salt at the corresponding position of each bearing through the returned pressure data, transmits the data to the high-pressure nitrogen pressure regulating valve and the corresponding pressure regulating valve of each bearing to adjust the nitrogen pressure of each corresponding bearing and make the nitrogen pressure of each bearing slightly larger than the pressure of the molten salt at the corresponding position of the bearing, so that the molten salt cannot enter the bearing through the sealing ring. At the same time, the lubrication system controller calculates the temperature data and change trend of each bearing through the nitrogen temperature data of each backflow pipe, and transmits the control data to the graphite regulating valve to control the graphite content in the nitrogen to better lubricate the bearing.

[0042] The inner wall of the connection of the pump shell 4 is expanded in diameter, and the expanded length is equal to the thickness of the superposition of the sealing ring sleeve 13, the bearing sleeve 51, the bearing pressing plate 42 and the locking ring 18. After the expansion, a tapered inner thread is formed on the expanded length. The outer wall of the sealing ring sleeve 13, the bearing sleeve 51, the bearing pressing plate 42 and the locking ring 18 is sleeved with a tapered outer thread, and the inner and outer threads are engaged and sealed with each other. The tightening direction of the thread is the same as the rotation direction of the screw rod. Two pairs of circular closed grooves are formed on the upper and lower ends of the inner wall and the outer wall of the bearing sleeve 51 at the same plane, and the grooves in the same pair of grooves in the same plane are penetrated. The screw rod is installed at the bearing, and the bearing installation upper surface is reduced in diameter. The diameter of the screw rod after the reduction is the same as the inner diameter of the bearing. The sealing ring 14 is installed in the sealing ring installation groove 15 of the sealing ring sleeve 13. After the sealing ring sleeve 13 is installed in place, the bearing sleeve 51 is installed in place, and then the bearing is installed at the shaft shoulder. After the bearing pressing plate 42 is installed in place, the locking ring 18 is installed, and the outer side of the locking ring 18 should be in the same plane with the installation surface of the high-pressure end flange plate 29 and the low-pressure end flange plate 28 on the pump shell 4 after the locking ring 18 is installed in place. Two through holes are formed at the two ends of the bearing outer ring corresponding to the two grooves in the inner wall of the bearing sleeve 51, so that the grooves in the inner wall of the bearing sleeve 51 are communicated with the inner wall of the bearing outer ring. A through hole is formed at the corresponding position of the two grooves in the outer wall of the pump shell 4 and the bearing sleeve 51, and a graphite-nitrogen mixed lubricating material inlet 9 is installed at the upper through hole, and a graphite-nitrogen mixed lubricating material outlet 10 is installed at the lower through hole. The high-pressure end of the medium-pressure section, the low-pressure end of the medium-pressure section, the high-pressure end of the low-pressure section and the low-pressure end of the low-pressure section are installed as described above. A U-shaped positioner is installed on the outer side of the low-pressure end sealing plate of the pump end low-pressure section, and a pump fixing sleeve with a trumpet-shaped upper part is installed at the bottom of the molten salt tank. The fixing sleeve is fixedly connected with the molten salt tank through the installation support 6. When the pump is installed, the pump is vertically lifted and placed into the tank top installation hole, and then is lowered to the trumpet-shaped mouth of the fixing sleeve. The U-shaped positioner slides into the positioning sleeve along the trumpet-shaped mouth. Because the pump bottom is of a non-fixed type, the pump does not need to be put into the molten salt tank and the molten salt tank does not need to be emptied during the installation and disassembly process, so that the work of the molten salt tank is not affected. The pressure side of the helical blade is thickened along the edge and protruded, and an installation groove 62 is formed on the protruded part which is in contact with the inner wall of the pump. A helical sealing ring 63 is installed in the installation groove 62. When the helical blade rotates, the helical sealing ring 63 moves to the end of the groove by rubbing against the inner wall of the pump shell 4. After being blocked at the end of the groove, the helical sealing ring 63 expands towards the inner wall of the pump and tightly combines with the inner wall of the pump to seal. The pump adopts a segmented structure, so that the axial pressure of the whole screw rod is decomposed and shared by multiple pressure bearings, so that the axial force of the bearing is reduced. At the same time, the axial expansion displacement of the whole screw rod is decomposed and shared by multiple spline couplings 1, so that the displacement of the part of the screw rod which extends out of the bearing end cover 57 and the sealing element at the bearing end cover 57 is reduced, and the sealing performance is improved.

[0043] The technical solutions provided by the embodiments of the present application are described in detail above. In this paper, specific examples are used to describe the principles and implementation modes of the embodiments of the present application. The above description of the embodiments is only applicable to help understand the principles of the embodiments of the present application.

Claims

1. A vertical immersion high-temperature molten salt transfer pump with a lubrication system, comprising a drive unit, characterized in that: The output end of the drive device is connected to a spline coupling (1), and the other end of the spline coupling (1) is connected to a screw. The screw is equipped with helical blades, and a pump housing (4) is fitted around the outer side of the helical blades. The screw includes a high-pressure section screw (2), a medium-pressure section screw (49), and a low-pressure section screw (30). The helical blades include a high-pressure section helical blade (3), a medium-pressure section helical blade (50), and a low-pressure section helical blade (52). The high-pressure section screw (2), the medium-pressure section screw (49), and the low-pressure section screw (30) are all connected by a spline coupling (1), bearings, bearing sleeves (51), and bearing pressure plates (42). The high-pressure section screw (2), the medium-pressure section screw (49), and the low-pressure section screw (30) are... The pump casing (4) is provided with a high-pressure section spiral blade (3), a medium-pressure section spiral blade (50) and a low-pressure section spiral blade (52), respectively. The pump casing (4) is provided with a flange. The bearing includes an axial-radial composite bearing (7) and a radial bearing (8). The axial-radial composite bearing (7) is provided at the low-pressure end. The axial-radial composite bearing (7) is provided with a graphite-nitrogen mixed lubricant inlet (9) and a graphite-nitrogen mixed lubricant outlet (10). The radial bearing (8) is installed at the high-pressure end. The radial bearing (8) is provided with a graphite-nitrogen mixed lubricant inlet (9) and a graphite-nitrogen mixed lubricant outlet (10). The graphite-nitrogen mixed lubricant inlet (9) and the graphite-nitrogen mixed lubricant outlet (10) are connected to a bearing lubrication system.

2. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 1, characterized in that: The flange includes a mounting flange (5), a flange (60), a high-pressure end flange (29), and a low-pressure end flange (28).

3. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 2, characterized in that: The inner side of the connecting end of the pump housing (4) is provided with a groove, and an internal thread is provided in the groove. The outer wall of the bearing sleeve (51) and the bearing pressure plate (42) is provided with an external thread. The bearing sleeve (51) and the bearing pressure plate (42) are threadedly connected to the pump housing (4). A locking ring (18) is provided on one side of the bearing pressure plate (42), and the locking ring (18) is threadedly connected to the pump housing (4).

4. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 3, characterized in that: The bearing sleeve (51) is provided with a bearing inside. A sealing ring sleeve (13) is provided at one end of the bearing sleeve (51). A sealing ring mounting groove (15) is provided inside the sealing ring sleeve (13). A sealing ring (14) is provided in the sealing ring mounting groove (15).

5. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 4, characterized in that: A flange (60) is provided at the top of the pump casing (4), and a cover plate (59) is provided on the outside of the flange (60). A bearing end cover (57) is fixedly connected to the outside of the cover plate (59). A radial bearing (8) is provided inside the bearing end cover (57). A coolant inlet (56) and a coolant outlet (58) are provided on the radial bearing (8).

6. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 5, characterized in that: The bottom end of the pump housing (4) is provided with an end positioning hole (54) and an end positioner (55). The bottom end of the pump housing (4) is provided with a radial bearing (8). The radial bearing (8) is provided with a graphite nitrogen mixed lubricant inlet (9) and a graphite nitrogen mixed lubricant outlet (10).

7. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 6, characterized in that: The outer edge of the spiral blade that contacts the pump casing (4) is provided with an installation groove (62), and a spiral sealing ring (63) is provided inside the installation groove (62).

8. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 7, characterized in that: A mounting bracket (6) is fixedly connected to the pump casing (4), and a mounting flange (5) is provided on the mounting bracket (6).

9. A vertical immersion high-temperature molten salt transfer pump with a lubrication system according to claim 8, characterized in that: The bearing lubrication system includes a lubrication and cooling microcomputer control device, a nitrogen storage tank, an ultra-fine graphite storage device, an ultra-fine graphite filtration device, a solid-gas separation device, a nitrogen filtration device, a thermometer, several pressure regulating valves, several pressure gauges, and several thermometers. The pressure regulating valves, pressure gauges, and thermometers are all connected to the lubrication and cooling microcomputer control device.

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