A high-temperature liquid metal circulating pump damping device for nuclear industry

Abstract

The present application relates to circulating pump technical field, specifically to a kind of high-temperature liquid metal circulating pump damping device for nuclear industry, including base, the top of base is fixedly connected with driving device, driving device is fixedly connected with driving shaft, one side of driving device is provided with pump shell, pump shell is installed on base, the two ends of pump shell are communicated with inlet and outlet, the end of driving shaft away from driving device is fixedly connected with transmission gear two, the other side of transmission gear two is fixedly connected with pump shaft.The present application utilizes centrifugal force field generated by impeller rotation, so that the solid particles with higher density are automatically enriched to the inner wall of pump shell, through mechanical transmission mechanism, filter screen frame is driven to periodically expand and contract in specific area, through the unique design of bidirectional screw rod, the timing and period of filtration and backwashing can be accurately controlled, the source interception and efficient capture of lead bismuth alloy particles are realized, the vibration and wear of main pump are significantly reduced from the root, and the running stability and life are improved.

Description

Technical Field

[0001] This invention relates to the field of circulating pump technology, and in particular to a vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry. Background Technology

[0002] In the nuclear industry, the long-term reliability of high-temperature liquid metal circulating pumps directly affects the safety and efficiency of the entire nuclear facility. During operation, these pumps contain solid particles generated by the oxidation and corrosion of lead-bismuth alloys within the liquid metal medium. These particles are not only a major cause of wear and failure of internal components (such as impellers and mechanical seals), but also a key factor inducing pump vibration and noise, affecting operational stability. Therefore, effective control of these particles is crucial for achieving pump vibration reduction and lifespan extension from the source.

[0003] Currently, nuclear-grade liquid metal loops generally employ branch filtration schemes, which involve diverting a small stream of fluid from the main loop for external filtration, rather than filtering the entire liquid. This is primarily due to considerations of engineering safety and economy: full-flow filtration results in enormous pressure losses and extremely high energy consumption, and the massive filter body becomes a vulnerable point in the main loop, requiring reactor shutdown for maintenance, severely impacting reactor availability. While branch filtration addresses these issues, it has inherent drawbacks: 1. The filtration process occurs outside the main loop, making it impossible to directly and in situ intercept high-concentration particles existing inside the pump chamber and accumulating on the pump casing wall due to centrifugal force; 2. It is a passive purification process, with efficiency entirely dependent on bypass flow and filter performance, rendering it ineffective against particles already deposited within the pump; 3. The filtration and backwashing cycles are completely fixed or rely on manual operation. Therefore, a vibration damping device for high-temperature liquid metal circulating pumps in the nuclear industry is proposed to address these problems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the background art by proposing a vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry includes a base, a drive device fixedly connected to the top of the base, a drive shaft fixedly connected to the drive device, a pump casing provided on one side of the drive device, the pump casing mounted on the base, an inlet and an outlet connected to both ends of the pump casing, two partitions fixedly connected inside the pump casing, a second transmission gear fixedly connected to the end of the drive shaft away from the drive device, the second transmission gear being located between the pump casing and the partition, and a pump shaft fixedly connected to the other side of the second transmission gear.

[0007] One side of one of the partitions is rotatably connected to a bidirectional threaded rod. The end of the bidirectional threaded rod away from the partition is fixedly connected to a transmission gear one. The outer wall of the transmission gear one meshes with the transmission gear two. A fixed slide is provided at the top of the bidirectional threaded rod. The two ends of the fixed slide are fixedly connected to the pump casing and the partition. A slide rod is slidably connected to the outer wall of the bidirectional threaded rod. A slide seat is fixedly connected to the top of the slide rod. A trapezoidal top block is fixedly connected to the top of the slide seat.

[0008] A large gear is installed above the fixed slide, and a small gear meshes with the outer wall of the large gear. A second transmission rod is fixedly connected inside the large gear, and a fixed plate is rotatably connected to the end of the second transmission rod. The fixed plate is fixedly connected to the pump casing. A first transmission rod is fixedly connected to one side of the small gear, and a cam is fixedly connected to the outer wall of the first transmission rod. A connecting rod is slidably connected to the surface of the cam. Four stop bars arranged in a circular array are fixedly connected to the outer wall of the second transmission rod.

[0009] Preferably, the other end of the transmission rod two is rotatably connected to the inside of the pump housing through a one-way bearing, and a sealing block is fixed to the top of the connecting rod. The sealing block is slidably connected to the pump housing through a rectangular slide groove. A channel one is opened inside the pump housing, and the channel one communicates with the rectangular slide groove.

[0010] Preferably, a filter frame is rotatably connected inside the sealing block via a second rotating shaft, and two arc-shaped grooves are arranged in a circular array with the second rotating shaft as the center inside the sealing block.

[0011] Preferably, both sides of the sealing block are provided with an opening and closing mechanism, including a sealing plate, the sealing plate and the sealing block are slidably connected, two inner rods are fixedly connected to the top of the sealing plate, a fixing rod is slidably connected to the outer wall of the inner rod, an inner spring is fixedly connected between the fixing rod and the inner rod, and the fixing rod is fixedly connected to the inside of the pump housing.

[0012] Preferably, one of the sealing plates has a second groove, on which a limit rod is slidably connected; the sealing block has a first groove, on which the limit rod is slidably connected to the sealing block through the first groove.

[0013] Preferably, the outer wall of the limiting rod is slidably connected to a sliding ring, and the bottom of the sliding ring is hinged to the surface of the filter frame.

[0014] Preferably, the trapezoidal top block is provided with a lifting mechanism on both sides, including an inclined side plate. Both sides of the inclined side plate are rotatably connected to the trapezoidal top block through a pivot. A torsion spring is arranged around the outer wall of the pivot. The two ends of the torsion spring are fixedly connected to the inclined side plate and the trapezoidal top block respectively. A second clamping plate is fixedly connected to the outer wall of the inclined side plate. A first clamping plate is fixedly connected to the side of the trapezoidal top block closest to the inclined side plate.

[0015] Preferably, the left end of channel one is connected to a branch pipe, the other end of the branch pipe is connected to the high pressure point of the pump casing, the middle end of channel one is connected to a slag discharge pipe one, a filter plate is installed diagonally below the slag discharge pipe one, the filter plate is installed inside channel one, the right end of channel one is connected to the inside of the pump casing, a filter is installed inside the branch pipe, and a slag discharge pipe two is connected inside the branch pipe.

[0016] Compared with existing technologies, the advantages of this invention are as follows:

[0017] This invention utilizes the pressure difference between the high and low pressure zones naturally formed inside the pump to drive filtration in the branch pipe. Before the liquid enters the filtration area, the centrifugal force of the impeller is used to concentrate solid particles towards the inner wall of the pump casing, creating favorable conditions for subsequent mechanical interception and further improving the overall filtration efficiency.

[0018] The rotational motion of the drive shaft is precisely converted into the periodic action of the filter screen extending to filter and retracting to backflush through mechanisms such as gear assembly, bidirectional threaded rod and trapezoidal top block. The whole process is automated and requires no additional control.

[0019] It achieves periodic shrinkage and shape change of the filter screen frame, and automatically backwashes the filter screen with the filtered clean liquid, which solves the problem of filter screen clogging and maintains long-term stable filtration efficiency.

[0020] By using different pitches of the bidirectional threaded rods, the duration of filtration and backwashing can be flexibly controlled, avoiding wasting filtration time.

[0021] When extended, the filter frame becomes horizontal to ensure uniform particle collection and withstand frontal scouring; when retracted, it becomes inclined to facilitate backwash liquid flow and particle slippage. At the same time, the combined design of the sealing block and sealing plate can effectively seal both sides during filtration, preventing liquid turbulence from causing the collected particles to escape. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the internal structure of the pump casing of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the pump casing of the present invention;

[0026] Figure 5 This is the present invention. Figure 4 Schematic diagram of the structure at point A in the middle;

[0027] Figure 6This is a schematic diagram of the structure of the cam in this invention;

[0028] Figure 7 This is a schematic diagram showing the positional relationship between the trapezoidal top block and the large gear of the present invention;

[0029] Figure 8 This is a schematic diagram of the trapezoidal top block shape structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the cross-sectional structure of the trapezoidal top block of the present invention;

[0031] Figure 10 This is the present invention. Figure 9 Schematic diagram of the structure at point B;

[0032] Figure 11 This is a schematic diagram of the structure of the sealing block in this invention;

[0033] Figure 12 This is a schematic diagram of the internal structure of the sealing block of the present invention;

[0034] Figure 13 This is the present invention. Figure 12 Schematic diagram of the structure at point C.

[0035] In the diagram: 1. Base; 2. Drive unit; 3. Drive shaft; 4. Inlet; 5. Pump casing; 6. Outlet; 7. Slag discharge pipe one; 8. Branch pipe; 9. Slag discharge pipe two; 10. Channel one; 11. Pump shaft; 12. Sealing block; 13. Large gear; 14. Transmission gear one; 15. Transmission gear two; 16. Bidirectional threaded rod; 17. Partition plate; 18. Connecting rod; 19. Fixing plate; 20. Small gear; 21. Trapezoidal top block; 22. Fixed slide; 23. Cam; 24. Transmission rod one; 25. Filter screen frame; 26. Filter plate; 27. Rectangular slide groove; 28. Fixed rod; 29. ​​Transmission rod two; 30. Stop bar; 31. Slide seat; 32. Slide rod; 33. Inclined side plate; 34. Rotating shaft one; 35. Torsion spring; 36. Clamping plate one; 37. Clamping plate two; 38. Inner rod; 39. Rotating shaft two; 40. Arc groove; 41. Inner spring; 42. Slide groove one; 43. Sealing plate; 44. Slide groove two; 45. Sliding ring; 46. Limiting rod. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] Reference Figure 1 - Figure 13 A vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry includes a base 1, a drive device 2 fixedly connected to the top of the base 1, a drive shaft 3 fixedly connected to the drive device 2, a pump casing 5 provided on one side of the drive device 2, the pump casing 5 being mounted on the base 1, an inlet 4 and an outlet 6 connected to both ends of the pump casing 5, two partitions 17 fixedly connected inside the pump casing 5, a transmission gear 2 15 fixedly connected to one end of the drive shaft 3 away from the drive device 2, the transmission gear 2 15 being located between the pump casing 5 and the partitions 17, and a pump shaft 11 fixedly connected to the other side of the transmission gear 2 15.

[0039] The left end of channel 10 is connected to branch pipe 8, and the other end of branch pipe 8 is connected to the high pressure point of pump casing 5. The middle end of channel 10 is connected to slag discharge pipe 7. A filter plate 26 is installed diagonally below slag discharge pipe 7. The filter plate 26 is installed inside channel 10. The right end of channel 10 is connected to the inside of pump casing 5. A filter is installed inside branch pipe 8. Slag discharge pipe 2 9 is connected inside branch pipe 8.

[0040] In this embodiment, high-temperature liquid metal enters the pump casing 5 through inlet 4. An impeller mounted on the pump shaft 11 rotates under drive, pressurizing the liquid metal and discharging it from outlet 6, thus completing the main circuit cycle.

[0041] Some of the molten metal flows from the high-pressure area to the low-pressure area, that is, the end of the branch pipe 8 away from the drive device 2 is the high-pressure area. It is filtered by the filter installed inside the branch pipe 8, and the impurities are intercepted by the slag discharge pipe 2 9. The connection between the branch pipe 8 and the slag discharge pipe 2 9 can be cut off by the valve to clean the slag discharge pipe 2 9.

[0042] One of the partitions 17 is rotatably connected to one side of a bidirectional threaded rod 16. The end of the bidirectional threaded rod 16 away from the partition 17 is fixedly connected to a transmission gear 14. The outer wall of the transmission gear 14 meshes with the transmission gear 15. A fixed slide 22 is provided on the top of the bidirectional threaded rod 16. The two ends of the fixed slide 22 are fixedly connected to the pump housing 5 and the partition 17. A slide rod 32 is slidably connected to the outer wall of the bidirectional threaded rod 16. A slide seat 31 is fixedly connected to the top of the slide rod 32. A trapezoidal top block 21 is fixedly connected to the top of the slide seat 31.

[0043] A large gear 13 is provided above the fixed slide 22. A small gear 20 meshes with the outer wall of the large gear 13. A transmission rod 29 is fixedly connected inside the large gear 13. A fixed plate 19 is rotatably connected to the end of the transmission rod 29. The fixed plate 19 is fixedly connected to the pump housing 5. A transmission rod 24 is fixedly connected to one side of the small gear 20. A cam 23 is fixedly connected to the outer wall of the transmission rod 24. A connecting rod 18 is slidably connected to the surface of the cam 23. Four stop bars 30 arranged in a circular array are fixedly connected to the outer wall of the transmission rod 29.

[0044] The other end of the transmission rod 29 is rotatably connected to the inside of the pump housing 5 through a one-way bearing. A sealing block 12 is fixed to the top of the connecting rod 18. The sealing block 12 is slidably connected to the pump housing 5 through a rectangular slide groove 27. A channel 10 is opened inside the pump housing 5, and the channel 10 communicates with the rectangular slide groove 27.

[0045] The interior of the sealing block 12 is rotatably connected to the filter frame 25 via the second rotating shaft 39. The interior of the sealing block 12 has two arc-shaped grooves 40 arranged in a circular array with the second rotating shaft 39 as the center.

[0046] The trapezoidal top block 21 is provided with a lifting mechanism on both sides, including an inclined side plate 33. Both sides of the inclined side plate 33 are rotatably connected to the trapezoidal top block 21 through a pivot 34. A torsion spring 35 is arranged around the outer wall of the pivot 34. The two ends of the torsion spring 35 are fixedly connected to the inclined side plate 33 and the trapezoidal top block 21 respectively. A second clamping plate 37 is fixedly connected to the outer wall of the inclined side plate 33. A first clamping plate 36 is fixedly connected to the side of the trapezoidal top block 21 near the inclined side plate 33.

[0047] In this embodiment, the drive shaft 3 is simultaneously driven by the drive device 2, and the drive shaft 3 drives the transmission gear 15 and the pump shaft 11 to rotate, thus setting the rotation direction of the pump shaft 11 to... Figure 3 As shown, rotating clockwise, the solid particles, being denser than the surrounding liquid metal, experience greater centrifugal force. Consequently, the solid particles are concentrated near the outer edge of the impeller and the inner wall of the pump casing 5. When the sealing block 12 extends from the pump casing 5 with the filter frame 25, it can efficiently intercept high-concentration particle groups, acting on the particle enrichment area without having to bear the additional pressure drop of the main circuit. Thus, while achieving extremely high interception efficiency, it avoids the energy loss inherent in traditional filtration methods.

[0048] Drive shaft 3 drives transmission gear 14 to rotate via transmission gear 2 15. When the bidirectional threaded rod 16 on transmission gear 14 rotates, it drives slide block 31 and trapezoidal top block 21 to reciprocate along fixed slide frame 22 via slide rod 32. The stop rod 30 is positioned at the four-quarters of bidirectional threaded rod 16. When trapezoidal top block 21 moves away from transmission gear 14, since trapezoidal top block 21 and inclined side plate 33 form a trapezoid, the inclined surface of inclined side plate 33 and trapezoidal top block 21 will abut against stop rod 30. Through stop rod 30, transmission rod 2 29 and large gear 13 rotate 90 degrees. When the next stop rod 30 rotates to the middle of the two inclined side plates 33, due to the arrangement of clamping plate 2 37 and clamping plate 1 36, when stop rod 30 is inside the two inclined side plates 33, the inclined side plates 33 will rotate to avoid it. When stop rod 30 is on the opposite side of the two inclined side plates 33, the inclined side plates 33 will generate sufficient rigidity.

[0049] The sealing block 12 is provided with opening and closing mechanisms on both sides, including a sealing plate 43. The sealing plate 43 is slidably connected to the sealing block 12. Two inner rods 38 are fixedly connected to the top of the sealing plate 43. A fixing rod 28 is slidably connected to the outer wall of the inner rod 38. An inner spring 41 is fixedly connected between the fixing rod 28 and the inner rod 38. The fixing rod 28 is fixedly connected to the inside of the pump housing 5.

[0050] One of the sealing plates 43 has a second groove 44, and a limit rod 46 is slidably connected to the second groove 44. The sealing block 12 has a first groove 42, and the limit rod 46 is slidably connected to the sealing block 12 through the first groove 42.

[0051] The outer wall of the limiting rod 46 is slidably connected to a sliding ring 45, and the bottom of the sliding ring 45 is hinged to the surface of the filter frame 25.

[0052] In this embodiment, the ratio of the number of teeth and the ratio of the circumference of the large gear 13 to the small gear 20 are both 2:1. When the large gear 13 rotates 90 degrees, it drives the small gear 20 to rotate half a revolution. The transmission rod 1 24 drives the cam 23 to rotate half a revolution. The connecting rod 18 moves with the rotation of the cam 23, thereby controlling the extension and retraction of the sealing block 12 from inside the pump housing 5. When the sealing block 12 extends, the inner spring 41 is stretched. The outer wall of the sealing block 12 blocks the sealing plate 43 from sliding with the sealing plate 43 and the inner rod 38, so that the top of the sealing plate 43 is in close contact with the rectangular channels on both sides of the arc groove 40. At the same time, the limiting rod 46 slides along the sliding groove 2 44 and the sliding groove 1 42, and drives the filter screen frame 25 to become horizontal through the sliding ring 45, so as to avoid uneven distribution of solid particles collected on the filter screen frame 25, and at the same time ensure that one side of the filter screen frame 25 is impacted by the liquid. The sealing plate 43 seals the two sides of the sealing block 12 to prevent liquid interference from causing particles to escape.

[0053] When the trapezoidal top block 21 moves close to the transmission gear 14 and then returns, the sealing block 12 can be controlled to retract. When the sealing block 12 retracts, the inner spring 41 resets, the sealing plate 43 returns to the lower part of the sealing block 12, and the filter screen frame 25 becomes inclined. The filtered liquid in the branch pipe 8 naturally enters the channel 10 during the backflow and flushes the back of the filter screen frame 25 through the rectangular channels on both sides of the sealing block 12. Subsequently, the solid particle filter plate 26 is intercepted in the slag discharge pipe 7, and the molten metal flows back into the pump casing 5. The filtration time and backwashing time of the sealing block 12 are controlled by the pitch of the threaded rod 16.

[0054] The working principle and usage of this invention are explained in detail below: High-temperature liquid metal enters the pump casing 5 through inlet 4. An impeller mounted on the pump shaft 11 rotates under drive, pressurizing the liquid metal and discharging it from outlet 6, thus completing the main circuit cycle.

[0055] Some of the molten metal flows from the high-pressure area to the low-pressure area, that is, the end of the branch pipe 8 away from the drive device 2 is the high-pressure area. It is filtered by the filter installed inside the branch pipe 8, and the impurities are intercepted by the slag discharge pipe 2 9. The connection between the branch pipe 8 and the slag discharge pipe 2 9 can be cut off by the valve to clean the slag discharge pipe 2 9.

[0056] Simultaneously, the drive device 2 drives the drive shaft 3, which in turn drives the transmission gear 15 and the pump shaft 11 to rotate, thus setting the rotation direction of the pump shaft 11. Figure 3 As shown, rotating clockwise, the solid particles, being denser than the surrounding liquid metal, experience greater centrifugal force. Consequently, the solid particles are concentrated near the outer edge of the impeller and the inner wall of the pump casing 5. When the sealing block 12 extends from the pump casing 5 with the filter frame 25, it can efficiently intercept high-concentration particle groups, acting on the particle enrichment area without having to bear the additional pressure drop of the main circuit. Thus, while achieving extremely high interception efficiency, it avoids the energy loss inherent in traditional filtration methods.

[0057] Drive shaft 3 drives transmission gear 14 to rotate via transmission gear 2 15. When the bidirectional threaded rod 16 on transmission gear 14 rotates, it drives slide block 31 and trapezoidal top block 21 to reciprocate along fixed slide frame 22 via slide rod 32. The stop rod 30 is positioned at the four-quarters of bidirectional threaded rod 16. When trapezoidal top block 21 moves away from transmission gear 14, since trapezoidal top block 21 and inclined side plate 33 form a trapezoid, the inclined surface of inclined side plate 33 and trapezoidal top block 21 will abut against stop rod 30. Through stop rod 30, transmission rod 2 29 and large gear 13 rotate 90 degrees. When the next stop rod 30 rotates to the middle of the two inclined side plates 33, due to the arrangement of clamping plate 2 37 and clamping plate 1 36, when stop rod 30 is inside the two inclined side plates 33, the inclined side plates 33 will rotate to avoid it. When stop rod 30 is on the opposite side of the two inclined side plates 33, the inclined side plates 33 will generate sufficient rigidity.

[0058] The gear ratio and circumference ratio of the large gear 13 and the small gear 20 are both 2:1. When the large gear 13 rotates 90 degrees, it drives the small gear 20 to rotate half a revolution. The transmission rod 1 24 drives the cam 23 to rotate half a revolution. The connecting rod 18 moves with the rotation of the cam 23, thereby controlling the extension and retraction of the sealing block 12 from inside the pump housing 5. When the sealing block 12 extends, the inner spring 41 is stretched. The outer wall of the sealing block 12 blocks the sealing plate 43, which slides along with the inner rod 38. This makes the top of the sealing plate 43 fit tightly against the rectangular channels on both sides of the arc groove 40. At the same time, the limiting rod 46 slides along the sliding groove 2 44 and the sliding groove 1 42, and drives the filter screen frame 25 to become horizontal through the sliding ring 45. This prevents the solid particles collected on the filter screen frame 25 from being unevenly distributed, while ensuring that one side of the filter screen frame 25 is impacted by the liquid. The sealing plate 43 seals the two sides of the sealing block 12 to prevent liquid interference from causing particles to escape.

[0059] When the trapezoidal top block 21 moves close to the transmission gear 14 and then returns, the sealing block 12 can be controlled to retract. When the sealing block 12 retracts, the inner spring 41 resets, the sealing plate 43 returns to the lower part of the sealing block 12, and the filter screen frame 25 becomes inclined. The filtered liquid in the branch pipe 8 naturally enters the channel 10 during the backflow and flushes the back of the filter screen frame 25 through the rectangular channels on both sides of the sealing block 12. Subsequently, the solid particle filter plate 26 is intercepted in the slag discharge pipe 7, and the molten metal flows back into the pump casing 5. The filtration time and backwashing time of the sealing block 12 are controlled by the pitch of the threaded rod 16, which greatly reduces the vibration of the pump body.

[0060] To further clarify, the aforementioned fixed connection should be interpreted broadly unless otherwise explicitly specified and limited. For example, it may be welding, gluing, or integral molding, or other conventional methods well known to those skilled in the art.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry, comprising a base (1), characterized in that, A drive device (2) is fixedly connected to the top of the base (1), and a drive shaft (3) is fixedly connected to the drive device (2). A pump housing (5) is provided on one side of the drive device (2). The pump housing (5) is installed on the base (1). The two ends of the pump housing (5) are connected to an inlet (4) and an outlet (6). Two partitions (17) are fixedly connected inside the pump housing (5). A transmission gear (15) is fixedly connected to one end of the drive shaft (3) away from the drive device (2). The transmission gear (15) is located between the pump housing (5) and the partition (17). A pump shaft (11) is fixedly connected to the other side of the transmission gear (15). One of the partitions (17) is rotatably connected to a double-threaded rod (16). The end of the double-threaded rod (16) away from the partition (17) is fixedly connected to a transmission gear (14). The outer wall of the transmission gear (14) meshes with the transmission gear (15). A fixed slide (22) is provided on the top of the double-threaded rod (16). Both ends of the fixed slide (22) are fixedly connected to the pump housing (5) and the partition (17). A slide rod (32) is slidably connected to the outer wall of the double-threaded rod (16). A slide seat (31) is fixedly connected to the top of the slide rod (32). A trapezoidal top block (21) is fixedly connected to the top of the slide seat (31). A large gear (13) is provided above the fixed slide (22). A small gear (20) meshes with the outer wall of the large gear (13). A transmission rod (29) is fixedly connected inside the large gear (13). A fixed plate (19) is rotatably connected to the end of the transmission rod (29). The fixed plate (19) is fixedly connected to the pump housing (5). A transmission rod (24) is fixedly connected to one side of the small gear (20). A cam (23) is fixedly connected to the outer wall of the transmission rod (24). A connecting rod (18) is slidably connected to the surface of the cam (23). Four stop bars (30) arranged in a circular array are fixedly connected to the outer wall of the transmission rod (29).

2. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 1, characterized in that: The other end of the transmission rod (29) is rotatably connected to the inside of the pump housing (5) through a one-way bearing. A sealing block (12) is fixed to the top of the connecting rod (18). The sealing block (12) is slidably connected to the pump housing (5) through a rectangular slide groove (27). A channel (10) is opened inside the pump housing (5), and the channel (10) is connected to the rectangular slide groove (27).

3. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 2, characterized in that: The interior of the sealing block (12) is rotatably connected to the filter frame (25) via the second rotating shaft (39). The interior of the sealing block (12) has two arc-shaped grooves (40) arranged in a circular array with the second rotating shaft (39) as the center.

4. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 3, characterized in that: Both sides of the sealing block (12) are provided with opening and closing mechanisms, including a sealing plate (43). The sealing plate (43) is slidably connected to the sealing block (12). Two inner rods (38) are fixedly connected to the top of the sealing plate (43). A fixing rod (28) is slidably connected to the outer wall of the inner rod (38). An inner spring (41) is fixedly connected between the fixing rod (28) and the inner rod (38). The fixing rod (28) is fixedly connected to the inside of the pump housing (5).

5. A vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 4, characterized in that: One of the sealing plates (43) has a second groove (44) with a limit rod (46) slidably connected to the second groove (44). The sealing block (12) has a first groove (42) with the limit rod (46) slidably connected to the sealing block (12) through the first groove (42).

6. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 5, characterized in that: The outer wall of the limiting rod (46) is slidably connected to a sliding ring (45), and the bottom of the sliding ring (45) is hinged to the surface of the filter frame (25).

7. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 1, characterized in that: The trapezoidal top block (21) is provided with a lifting mechanism on both sides, including an inclined side plate (33). Both sides of the inclined side plate (33) are rotatably connected to the trapezoidal top block (21) through a first rotating shaft (34). A torsion spring (35) is arranged around the outer wall of the first rotating shaft (34). The two ends of the torsion spring (35) are fixed to the inclined side plate (33) and the trapezoidal top block (21) respectively. A second clamping plate (37) is fixed to the outer wall of the inclined side plate (33). A first clamping plate (36) is fixed to the side of the trapezoidal top block (21) near the inclined side plate (33).

8. The vibration damping device for a high-temperature liquid metal circulating pump used in the nuclear industry according to claim 2, characterized in that: The left end of channel one (10) is connected to a branch pipe (8), and the other end of the branch pipe (8) is connected to the high pressure of the pump casing (5). The middle end of channel one (10) is connected to a slag discharge pipe one (7). A filter plate (26) is installed diagonally below the slag discharge pipe one (7). The filter plate (26) is installed inside channel one (10). The right end of channel one (10) is connected to the inside of the pump casing (5). A filter is installed inside the branch pipe (8). The inside of the branch pipe (8) is connected to a slag discharge pipe two (9).

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