Novel tank-type molten salt reactor main pump structure

Abstract

The invention belongs to the technical field of fluid machinery, and particularly relates to a novel tank type molten salt reactor main pump structure. Comprising a driving device, a sealing section, an air cavity section and a working section which are sequentially connected from top to bottom. The driving device is connected with the working section through a rotating rod; the rotating rod is rotatably connected with the sealing section and the air cavity section; the air cavity section comprises a third outer shell, an air outlet pipe and an air inlet pipe penetrate through the side wall of the third outer shell, an air outlet control unit is arranged at the end, close to the third outer shell, of the air outlet pipe, an air inlet control unit is arranged at the end, close to the third outer shell, of the air inlet pipe, and the air outlet control unit and the air inlet control unit are connected with the working section. The gas outlet control unit and the gas inlet control unit perform negative feedback regulation on the molten salt liquid level of the third outer shell, so that the molten salt liquid level is prevented from being in direct contact with the sealing section; the working section comprises an impeller, a guide vane, a fused salt inlet and a fused salt outlet, fused salt enters the third outer shell from the fused salt inlet, then flows into the impeller and the guide vane section through the pump inlet to be pressurized and stabilized, and finally flows out through the fused salt outlet.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid machinery, and particularly relates to a novel main pump structure for a canned molten salt reactor. Background Art

[0002] The main pump of a molten salt reactor is the core power device for the molten salt circulation in the primary loop system of a loop-type molten salt reactor. The molten salt reactor uses molten salt as the heat exchange medium, and the main function of the main pump is to maintain the circulating flow of the molten salt in the reactor. Due to the high-temperature characteristics of the molten salt, the main pump must have good high-temperature tolerance and sealing performance to ensure the safe circulation of the molten salt inside the reactor. The main pump of the primary loop of a conventional pressurized water reactor adopts a canned motor pump structure, and the main phase change in the primary loop is mainly the gas-liquid phase change, without solid-liquid phase transformation. In the molten salt reactor system, after the molten salt cools down, it will transform from the liquid phase to the solid phase. Filling the canned motor pump with high-temperature molten salt will cause the risk of liquid-solid phase transformation, resulting in the failure of the motor structure. At the same time, it cannot operate due to the too high temperature of the high-temperature molten salt. If a conventional mechanical seal is used to prevent the molten salt from entering the motor cavity to protect the key components of the motor from the influence of liquid-solid phase transformation and high temperature of the molten salt; this solution has the problem that the high and low temperatures meet at the mechanical seal, causing the liquid high-temperature molten salt to form crystals and solidify, damaging the mechanical seal surface, resulting in seal failure and leakage of highly radioactive substances. Using a mechanical shaft seal pump in the primary loop system of a molten salt reactor has a very high risk of molten salt leakage.

[0003] The key to the structure of the main pump of a loop-type molten salt reactor is how to achieve molten salt sealing. Using a mechanical seal has a relatively high risk of seal failure and radioactive substance leakage due to molten salt crystallization and solidification. How to achieve primary loop molten salt sealing is the key problem of the main pump seal structure of a molten salt reactor. Summary of the Invention

[0004] The purpose of the present invention is to provide a novel main pump structure for a canned molten salt reactor that uses gas to isolate the molten salt and the motor.

[0005] To achieve the above-mentioned invention purpose, the technical solution adopted by the present invention is:

[0006] A novel main pump structure for a canned molten salt reactor includes a driving device, a sealing section, a gas cavity section, and a working section connected in sequence from top to bottom; the driving device is connected to the working section through a rotating rod, and the rotating rod is rotatably connected to the sealing section and the gas cavity section; the gas cavity section includes a third outer casing, and an air outlet pipe and an air inlet pipe are penetrated through the side wall of the third outer casing. An air outlet control unit is provided at one end of the air outlet pipe close to the third outer casing, and an air inlet control unit is provided at one end of the air inlet pipe close to the third outer casing. The air outlet control unit and the air inlet control unit are connected to the working section.

[0007] Further, the intake air control unit includes a first intake air control unit and a second intake air control unit; the first intake air control unit includes a first transmission rod vertically arranged inside the third housing body. The first transmission rod is slidably connected to a first fixed block and a second fixed block fixedly arranged on the inner wall of the third housing body. A first floating ball is fixedly arranged at the bottom of the first transmission rod. A first spring is sleeved on the first transmission rod. One end of the first spring is fixedly connected to the first transmission rod, and the other end is fixedly connected to the bottom of the first fixed block. The second intake air control unit is arranged in the intake pipe. A first tooth part is arranged in the middle of the first transmission rod, and the first tooth part meshes with the second intake air control unit.

[0008] Further, the second intake air control unit includes a first transmission gear and a first circular baffle. A plurality of first arc-shaped blocking pieces are evenly spaced in the circumferential direction of the first transmission gear. The first circular baffle is fixedly arranged at one end of the intake pipe close to the third housing body. A first annular groove is arranged in the circumferential direction of the first circular baffle. A plurality of first arc-shaped through holes are evenly spaced around the axis on one side of the first circular baffle. The first arc-shaped blocking piece is slidably connected with the first annular groove. A return air pipe is communicated with the bottom of the intake pipe. A screw rod is fixedly arranged on one side of the first transmission gear. The screw rod penetrates through the axis of the first circular baffle and is threadedly connected with a push rod. A shielding plate adapted to the return air pipe is fixedly arranged at the bottom of the push rod. A sliding block is fixedly arranged at the top of the push rod. The sliding block is slidably connected with a sliding groove arranged along the length direction at the top of the intake pipe.

[0009] Further, the exhaust air control unit includes a first exhaust air control unit and a second exhaust air control unit; the first exhaust air control unit includes a second transmission rod vertically arranged inside the third housing body. The second transmission rod is slidably connected to a third fixed block and a fourth fixed block fixedly arranged on the inner wall of the third housing body. A second floating ball is fixedly arranged at the bottom of the second transmission rod. A second spring is sleeved on the second transmission rod. One end of the second spring is fixedly connected to the second transmission rod, and the other end is fixedly connected to the bottom of the third fixed block. The second exhaust air control unit is arranged in the exhaust pipe. A second tooth part is arranged in the middle of the second transmission rod, and the second tooth part meshes with the second exhaust air control unit.

[0010] Further, the second exhaust air control unit includes a second transmission gear and a second circular baffle. A plurality of second arc-shaped blocking pieces are evenly spaced in the circumferential direction of the second transmission gear. The second circular baffle is fixedly arranged at one end of the exhaust pipe close to the third housing body. A second annular groove is arranged in the circumferential direction of the second circular baffle. A plurality of second arc-shaped through holes are evenly spaced around the axis on one side of the second circular baffle. The second arc-shaped blocking piece is slidably connected with the second annular groove.

[0011] Furthermore, it further includes a first outer casing. The driving device is vertically and detachably provided at the top of the first outer casing. A mechanical seal device is provided at the bottom of the first outer casing. The rotating rod penetrates through the bottom of the first outer casing and is rotatably connected to the mechanical seal device. The top of the rotating rod is connected to the output end of the driving device through a coupling.

[0012] Furthermore, it further includes a second outer casing. The top of the first outer casing is threadedly connected to the top of the second outer casing. A dry gas seal device is provided at the bottom of the second outer casing. The rotating rod penetrates through the bottom of the second outer casing and is rotatably connected to the dry gas seal device. The bottom of the second outer casing is threadedly connected to the third outer casing.

[0013] Furthermore, the working section includes an impeller, a guide vane, a first inner casing, a conical plate, and a second inner casing. The first inner casing which is vertically arranged is threadedly connected to the center of the top of the third outer casing. The second inner casing is fixedly provided at the bottom of the third outer casing. A pump inlet is formed between the first inner casing and the second inner casing. The conical plate is fixedly provided at the bottom of the first inner casing. A limiting port adapted to the rotating rod is provided at the center of the conical plate. The rotating rod is rotatably connected to the limiting port. The impeller and the guide vane are fixedly provided on the part of the rotating rod located inside the second inner casing in sequence from top to bottom.

[0014] Furthermore, the working section further includes a molten salt inlet and a molten salt outlet. The molten salt inlet penetrates through the side wall of the third outer casing near the bottom. The molten salt outlet penetrates through the bottom of the third outer casing and communicates with the inside of the second inner casing.

[0015] Beneficial effects: By adopting a gas barrier, the direct contact between the molten salt and the sealing structure is blocked, avoiding the leakage problem of radioactive substances caused by the sealing failure due to the phase change of the molten salt. By adopting a tank structure, it has the advantage of uniform circumferential distribution of thermal strain, and at the same time is beneficial to keeping the pump section in good hydraulic performance, thereby improving the overall operation stability and safety of the main pump. The molten salt liquid level is controlled by an air outlet control unit and an air inlet control unit, and the air outlet control unit and the air inlet control unit perform negative feedback regulation through the change of the liquid level height itself. When the liquid level is too low, the air pressure is reduced by opening the air outlet pipe to raise the liquid level. When the liquid level is too high, the air inlet pipe is opened to increase the air pressure so as to lower the liquid level, and finally the liquid level is maintained at an ideal height. In the process, through the simple mechanical cooperation of each component, the adjustment process is efficient and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front elevation sectional view of the present invention;

[0017] Figure 2 is Figure 1 the enlarged view at A in

[0018] Figure 3 is Figure 1 The enlarged view at position B in

[0019] Figure 4 the exploded view of the second intake control unit;

[0020] Figure 5 the exploded view of the second outlet control unit. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. If not specifically specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] As Figures 1-5 shown, a novel main pump structure of a canned molten salt reactor includes a driving device 1, a sealing section, a gas cavity section, and a working section connected in sequence from top to bottom; the driving device 1 is connected to the working section through a rotating rod 8, and the rotating rod 8 is rotatably connected to the sealing section and the gas cavity section; the gas cavity section includes a third outer casing 12, and an air outlet pipe 505 and an air inlet pipe 605 are penetrated through the side wall of the third outer casing 12. An outlet control unit is provided at one end of the air outlet pipe 505 close to the third outer casing 12, and an inlet control unit is provided at one end of the air inlet pipe 605 close to the third outer casing 12. The outlet control unit and the inlet control unit are connected to the working section. The working section includes an impeller 801, a guide vane 802, a molten salt inlet 7, and a molten salt outlet 9. The molten salt 16 enters the inside of the third outer casing 12 from the molten salt inlet 7, and then flows into the impeller 801 and the guide vane 802 section through the pump inlet 17 for pressurization and flow stabilization, and finally flows out through the molten salt outlet 9. During the working process, the external gas circulation system injects inert gas into the inside of the third outer casing 12 through the air inlet pipe 605. The gas is used to isolate the molten salt 16 and the mechanical seal device 3. At the same time, in order to prevent the radiation gas inside the third outer casing 12 from leaking from the tank body, a gas seal device 4 is also provided between the mechanical seal device 3 and the gas cavity section, and finally the complete isolation of the molten salt 16 and the mechanical seal device 3 is realized.

[0024] AsFigure 2 、 4, as shown in FIGS. 5, the intake air control unit includes a first intake air control unit and a second intake air control unit; the first intake air control unit includes a first transmission rod 608 vertically disposed inside the third housing 12. The first transmission rod 608 is slidably connected to a first fixed block 601 and a second fixed block 607 fixedly disposed on the inner wall of the third housing 12. A first float 609 is fixedly provided at the bottom of the first transmission rod 608. A first spring 602 is sleeved on the first transmission rod 608. One end of the first spring 602 is fixedly connected to the first transmission rod 608, and the other end is fixedly connected to the bottom of the first fixed block 601; a second intake air control unit is provided in the intake pipe 605. A first tooth portion 603 is provided in the middle of the first transmission rod 608, and the first tooth portion 603 meshes with the second intake air control unit. The exhaust air control unit includes a first exhaust air control unit and a second exhaust air control unit; the first exhaust air control unit includes a second transmission rod 507 vertically disposed inside the third housing 12. The second transmission rod 507 is slidably connected to a third fixed block 501 and a fourth fixed block 506 fixedly disposed on the inner wall of the third housing 12. A second float 508 is fixedly provided at the bottom of the second transmission rod 507. A second spring 502 is sleeved on the second transmission rod 507. One end of the second spring 502 is fixedly connected to the second transmission rod 507, and the other end is fixedly connected to the bottom of the third fixed block 501; a second exhaust air control unit is provided in the exhaust pipe 505. A second tooth portion 503 is provided in the middle of the second transmission rod 507, and the second tooth portion 503 meshes with the second exhaust air control unit. The second intake air control unit includes a first transmission gear 6041 and a first circular baffle 6043. A plurality of first arc-shaped blocking pieces 6042 are evenly spaced in the circumferential direction of the first transmission gear 6041. The first arc-shaped blocking pieces 6042 are used to block the first arc-shaped perforations 6045; the first circular baffle 6043 is fixedly provided at one end of the intake pipe 605 close to the third housing 12. A first annular groove 6044 is provided in the circumferential direction of the first circular baffle 6043. A plurality of first arc-shaped perforations 6045 are evenly spaced around the axis on one side of the first circular baffle 6043. The first arc-shaped blocking pieces 6042 are slidably connected to the first annular groove 6044; a return air pipe 606 is communicated with the bottom of the intake pipe 605. A screw rod 6046 is fixedly provided on one side of the first transmission gear 6041. The screw rod 6046 penetrates through the axis of the first circular baffle 6043 and is threadedly connected to a push rod 6047. A shutter 6048 adapted to the return air pipe 606 is fixedly provided at the bottom of the push rod 6047. A slider 6049 is fixedly provided at the top of the push rod 6047. The slider 6049 is slidably connected to a chute provided along the length direction at the top of the intake pipe 605.The second air outlet control unit includes a second transmission gear 5041 and a second circular baffle 5043. A plurality of second arc-shaped baffles 5042 are evenly spaced in the circumferential direction of the second transmission gear 5041. The second arc-shaped baffles 5042 are used to block the second arc-shaped perforations 5045. The second circular baffle 5043 is fixedly arranged at one end of the air outlet pipe 505 close to the third outer casing 12. A second annular groove 5044 is provided in the circumferential direction of the second circular baffle 5043. A plurality of second arc-shaped perforations 5045 are evenly spaced around the axis on one side of the second circular baffle 5043. The second arc-shaped baffles 5042 are slidably connected to the second annular groove 5044. Since it works in a high-temperature environment, the first float 609 and the second float 508 are made of high-temperature resistant materials, which can be hollow iron balls. During operation, the liquid level of the molten salt 16 should be maintained between the high liquid level and the low liquid level. When the liquid level is in the middle of the two, it means that the gas pressure is appropriate. At this time, there will be no gas flow in the intake pipe 605 and the air outlet pipe 505, and the air pressure inside the third outer casing 12 remains stable. When the liquid level is above the middle value (the middle value between the high liquid level and the low liquid level, and the same applies hereinafter), it means that the air pressure is slightly low. At this time, the molten salt 16 will push the first float 609 upward and then push the first tooth part 603 upward, thereby driving the rotation of the first transmission gear 6041 so that the first arc-shaped perforation 6045 is gradually opened. The gas enters the third outer casing 12 from the first arc-shaped perforation 6045, increasing the internal air pressure, thereby reducing the liquid level of the molten salt 16. According to the height of the liquid level of the molten salt 16, the opening degree of the first arc-shaped perforation 6045 is different. The higher the liquid level, the greater the opening degree of the first arc-shaped perforation 6045, and the faster the gas enters, thus increasing the pressure inside the third outer casing 12 faster, thereby pushing the liquid level down; conversely, when the liquid level is below the middle value, it means that the air pressure is slightly high. The second spring 502 will push the second transmission rod 507 downward, and then the second tooth part 503 will drive the second transmission gear 5041 to rotate, finally making the second arc-shaped perforation 5045 gradually opened, and the internal gas is discharged from the second arc-shaped perforation 5045, thereby reducing the internal air pressure and making the liquid level rise. It should be noted that when the liquid level is at the middle value, the first transmission gear 6041 just contacts the top of the first tooth part 603, and the second transmission gear 5041 just contacts the bottom of the second tooth part 503. When the liquid level is at the middle value, the liquid level will push the first transmission gear 6041 to rotate upward but not downward, and when the liquid level is at the middle value, the liquid level will not push the second transmission gear 5041 to rotate upward but will rotate downward. Since the external gas circulation system is always in the air supply state, a return air pipe 606 is needed to divide the pressure. When the liquid level is at the middle value, the first arc-shaped perforation 6045 is completely closed, and the shutter 6048 is located at... Figure 2At the position shown, the return air pipe 606 is in a fully open state, and the gas flows back from the return air pipe 606 to the input end of the external gas circulation system (the gas flowing out of the air outlet pipe 505 also flows into the input end). When the first driving gear 6041 rotates, it will drive the screw 6046 to rotate, thereby pushing the shutter 6048 to move to the right to gradually close the return air pipe 606, so as to achieve a greater air pressure supply and make the liquid level drop faster.

[0025] As Figure 1 shown, it further includes a first outer casing 10. A driving device 1 is vertically provided at the top of the first outer casing 10 detachably. A mechanical seal device 3 is provided at the bottom of the first outer casing 10. The rotating rod 8 penetrates through the bottom of the first outer casing 10 and is rotatably connected to the mechanical seal device 3. The top of the rotating rod 8 is connected to the output end of the driving device 1 through a coupling 2. It further includes a second outer casing 11. The top of the first outer casing 10 is threadedly connected to the top of the second outer casing 11. A dry gas seal device 4 is provided at the bottom of the second outer casing 11. The rotating rod 8 penetrates through the bottom of the second outer casing 11 and is rotatably connected to the dry gas seal device 4. The bottom of the second outer casing 11 is threadedly connected to a third outer casing 12. The mechanical seal device 3 and the dry gas seal device 4 are both prior arts. The dry gas seal device 4 is used to prevent the leakage of the radiation gas inside the inner cavity of the third outer casing 12.

[0026] As Figure 3 shown, the working section includes an impeller 801, a guide vane 802, a first inner casing 13, a conical plate 14 and a second inner casing 15. A vertically arranged first inner casing 13 is threadedly connected to the center of the top of the third outer casing 12. The bottom of the third outer casing 12 is fixedly provided with a second inner casing 15. A pump inlet 17 is formed between the first inner casing 13 and the second inner casing 15. The bottom of the first inner casing 13 is fixedly provided with a conical plate 14. A limiting port 1401 adapted to the rotating rod 8 is provided at the center of the conical plate 14. The rotating rod 8 is rotatably connected to the limiting port 1401. The part of the rotating rod 8 located inside the second inner casing 15 is fixedly provided with an impeller 801 and a guide vane 802 in sequence from top to bottom. The working section further includes a molten salt inlet 7 and a molten salt outlet 9. The molten salt inlet 7 penetrates through the side wall of the third outer casing 12 near the bottom. The molten salt outlet 9 penetrating through the bottom of the third outer casing 12 communicates with the inside of the second inner casing 15. The conical end of the conical plate 14 faces downward, and the cross section of the lower end face of the conical plate 14 is arc-shaped. The conical plate 14 is arranged at the pump inlet 17 to play a role in guiding the molten salt 16, and the arc-shaped radian can be adjusted according to requirements. During the working process, the molten salt 16 may flow into the inside of the first inner casing 13 through the limiting port 1401. Therefore, a vent hole 1301 that can pass air is provided on the side wall of the top of the first inner casing 13 to prevent the molten salt from contacting the upper half of the sealing section through the inside of the first inner casing 13. In this application, a volute-less guide vane type mixed flow pump section is selected, which has higher efficiency compared with the conventional circular volute pump section.

[0027] It should be noted that the horizontal heights of the air outlet pipe 505 and the air inlet pipe 605 are higher than the high liquid level, and the horizontal height of the molten salt inlet 7 is lower than the pump inlet 17. The third outer casing 12 adopts a rotating body tank with a symmetrical structure. The thermal stress distribution of the tank of this structure is relatively uniform and is not easily deformed by high-temperature and high-pressure molten salt.

[0028] Working principle: Molten salt enters the inner cavity of the third outer casing 12 through the molten salt inlet 7, flows into the impeller 801 through the pump inlet 17 in the inner cavity of the third outer casing 12, and then flows out to the external circulation pipeline through the molten salt outlet 9 after being pressurized by the impeller 801 and stabilized by the guide vane 802. During operation, the liquid level of the molten salt 16 in the third outer casing 12 is controlled by the air outlet control unit and the air inlet control unit. When the liquid level is between the high liquid level and the low liquid level, it means that the gas pressure is appropriate. At this time, there will be no gas flow (inflow or outflow) in both the air inlet pipe 605 and the air outlet pipe 505, and the air pressure inside the third outer casing 12 remains stable. When the liquid level is above the middle value, it means that the air pressure is slightly small. At this time, the molten salt 16 will push the float 609 upward, thereby pushing the tooth part 603 upward, driving the first transmission gear 6041 to rotate, and gradually opening the first arc-shaped perforation 6045. The gas enters the third outer casing 12 from the first arc-shaped perforation 6045, increasing the internal air pressure, thereby reducing the liquid level of the molten salt 16. According to the height of the liquid level of the molten salt 16, the opening degree of the first arc-shaped perforation 6045 is different. The higher the liquid level, the greater the opening degree of the first arc-shaped perforation 6045, and the faster the gas enters, thus increasing the pressure inside the third outer casing 12 faster, and pushing the liquid level down; conversely, when the liquid level is below the middle value, it means that the air pressure is slightly large. The second spring 502 will push the transmission rod 507 downward, causing the tooth part 503 to drive the second transmission gear 5041 to rotate, and finally gradually opening the second arc-shaped perforation 5045. The internal gas is discharged from the second arc-shaped perforation 5045, thereby reducing the internal air pressure and raising the liquid level; keeping the liquid level at the middle value.

[0029] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, variations, modifications, and substitutions made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A new type of tank-type molten salt reactor main pump structure, characterized by: The invention comprises a driving device (1), a sealing section, an air cavity section and a working section which are connected in sequence from top to bottom; the driving device (1) is connected to the working section via a rotating rod (8), and the rotating rod (8) is rotatably connected to the sealing section and the air cavity section; the air cavity section comprises a third outer shell (12), an air outlet pipe (505) and an air inlet pipe (605) are provided through the side wall of the third outer shell (12), an air outlet control unit is provided at one end of the air outlet pipe (505) close to the third outer shell (12), and an air inlet control unit is provided at one end of the air inlet pipe (605) close to the third outer shell (12), and the air outlet control unit and the air inlet control unit are connected to the working section.

2. According to claim 1, a new tank-type molten salt reactor main pump structure is characterized in that: The air intake control unit includes a first air intake control unit and a second air intake control unit; The first air intake control unit comprises a transmission rod (608) vertically arranged inside the third outer shell (12); the transmission rod (608) is slidably connected to a first fixed block (601) and a second fixed block (607) fixedly arranged on the inner wall of the third outer shell (12); a float (609) is fixedly arranged at the bottom of the transmission rod (608); a first spring (602) is sleeved on the transmission rod (608); one end of the first spring (602) is fixedly connected to the transmission rod (608), and the other end is fixedly connected to the bottom of the first fixed block (601); the second air intake control unit is arranged in the air intake pipe (605); a tooth portion (603) is arranged in the middle of the transmission rod (608); the tooth portion (603) engages with the second air intake control unit.

3. According to claim 2, a new tank-type molten salt reactor main pump structure is characterized in that: The second air intake control unit comprises a first transmission tooth (6041) and a first circular baffle (6043); the first transmission tooth (6041) is provided with a plurality of first arc-shaped baffles (6042) at even intervals in the circumferential direction; the first circular baffle (6043) is fixedly arranged at one end of the air intake pipe (605) close to the third outer shell (12); the first circular baffle (6043) is provided with a first annular groove (6044) in the circumferential direction; a plurality of first arc-shaped through holes (6045) are evenly spaced around the axis on one side of the first circular baffle (6043); the first arc-shaped baffles (6042) and the first annular The groove (6044) is slidably connected; the bottom of the air inlet pipe (605) is connected to a return air pipe (606); a screw rod (6046) is fixedly provided on one side of the first transmission tooth (6041); the screw rod (6046) passes through the axis of the first circular baffle (6043) and is threadedly connected to a push rod (6047); a baffle (6048) adapted to the return air pipe (606) is fixedly provided at the bottom of the push rod (6047); a slider (6049) is fixedly provided on the top of the push rod (6047); the slider (6049) is slidably connected to a slide groove arranged along the length direction at the top of the air inlet pipe (605).

4. According to claim 1, a novel tank-type molten salt reactor main pump structure is characterized in that: The air outlet control unit includes a first air outlet control unit and a second air outlet control unit; The first air outlet control unit comprises a second transmission rod (507) vertically arranged inside the third outer shell (12); the second transmission rod (507) is slidably connected to a third fixed block (501) and a fourth fixed block (506) fixedly arranged on the inner wall of the third outer shell (12); a second float (508) is fixedly arranged at the bottom of the second transmission rod (507); a second spring (502) is sleeved on the second transmission rod (507); one end of the second spring (502) is fixedly connected to the second transmission rod (507), and the other end is fixedly connected to the bottom of the third fixed block (501); the second air outlet control unit is arranged in the air outlet pipe (505); a second tooth portion (503) is arranged in the middle of the second transmission rod (507); the second tooth portion (503) meshes with the second air outlet control unit.

5. According to claim 4, a new tank-type molten salt reactor main pump structure is characterized in that: The second air outlet control unit comprises a second transmission tooth (5041) and a second circular baffle (5043); the second transmission tooth (5041) is provided with a plurality of second arc-shaped baffles (5042) at even intervals in the circumferential direction; the second circular baffle (5043) is fixedly arranged at one end of the air outlet pipe (505) close to the third outer shell (12); a second annular groove (5044) is provided on the circumferential direction of the second circular baffle (5043); a plurality of second arc-shaped through holes (5045) are evenly spaced around the axis on one side of the second circular baffle (5043); and the second arc-shaped baffle (5042) is slidably connected to the second annular groove (5044).

6. A novel tank-type molten salt reactor main pump structure according to claim 1, characterized in that: It also comprises a first outer shell (10), the top of which is detachably and vertically provided with the driving device (1), the bottom of which is provided with a mechanical sealing device (3), the rotating rod (8) passing through the bottom of the first outer shell (10) and being rotatably connected to the mechanical sealing device (3), and the top of which is connected to the output end of the driving device (1) via a coupling (2).

7. A novel tank-type molten salt reactor main pump structure according to claim 6, characterized in that: The invention also comprises a second outer shell (11), wherein the bottom of the first outer shell (10) is threadedly connected to the top of the second outer shell (11), a dry gas sealing device (4) is provided at the bottom of the second outer shell (11), the rotating rod (8) passes through the bottom of the second outer shell (11) and is rotatably connected to the dry gas sealing device (4), and the bottom of the second outer shell (11) is threadedly connected to the third outer shell (12).

8. A novel tank-type molten salt reactor main pump structure according to claim 1, characterized in that: The working section comprises an impeller (801), a guide vane (802), a first inner casing (13), a conical plate (14) and a second inner casing (15); the first inner casing (13) arranged vertically is threadedly connected at the top axis of the third outer casing (12); the second inner casing (15) is fixedly arranged at the bottom of the third outer casing (12); a pump inlet (17) is formed between the first inner casing (13) and the second inner casing (15); the conical plate (14) is fixedly arranged at the bottom of the first inner casing (13); a limiting opening (1401) adapted to the rotating rod (8) is arranged at the axis of the conical plate (14); the rotating rod (8) is rotatably connected to the limiting opening (1401); the portion of the rotating rod (8) located in the second inner casing (15) is fixedly arranged with the impeller (801) and the guide vane (802) in sequence from top to bottom.

9. A novel tank-type molten salt reactor main pump structure according to claim 8, characterized in that: The working section further comprises a molten salt inlet (7) and a molten salt outlet (9); the molten salt inlet (7) is penetrated through the side wall of the third outer shell (12) near the bottom; and the molten salt outlet (9) communicating with the interior of the second inner shell (15) is penetrated through the bottom of the third outer shell (12).

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