Shield pump set for special environment
By designing the guide section and drainage pipe system of the shielded pump unit, the problem of radioactive liquid retention during disassembly of the shielded pump unit was solved, achieving safe disassembly and cooling effects, and ensuring the stable operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI APOLLO MACHINERY CO LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-12
AI Technical Summary
In the special radiation environment of handling radioactive materials, radioactive liquid may remain inside the pump body during the disassembly of the shielded pump unit, endangering the health of maintenance personnel.
Design a canned pump unit, including an outer cylinder, a base, a pump body, an inlet pipe, an outlet pipe, a drain pipe, and a guide section. The guide section and the drain pipe are used to extract stagnant liquid, and a floating pipe and float system are used to automatically adjust the suction port position when the liquid decreases to ensure that the liquid is completely discharged.
It effectively extracts radioactive liquid from the shielded pump unit, prevents liquid stagnation, ensures maintenance safety, and cools down the pump body during operation through cooling gaps to prevent overheating.
Smart Images
Figure CN122014673A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of canned pump technology, and in particular to a canned pump assembly for special environments. Background Technology
[0002] In the special radiation environment of radioactive material handling, extremely high requirements are placed on the protective performance and operational stability of power transmission equipment. Therefore, specially designed shielded pump sets are required. The shielded pump sets have undergone special structural optimization and protective design for the radiation environment, which can effectively resist radiation interference and ensure the stability of the equipment itself. Its long-term stable and reliable operation is an important foundation for ensuring the safety of the overall system and building a solid defense against radioactive material leakage.
[0003] During long-term operation, canned motor pump units inevitably require planned maintenance, troubleshooting, or component replacement. When a canned motor pump unit needs to be disassembled, a significant and dangerous technical problem is exposed: although the inlet and outlet valves are closed after the pump is stopped, a certain amount of radioactive liquid will still remain in low-lying dead corners such as the pump casing cavity and impeller flow channel, which can easily affect the life and health of maintenance personnel. Summary of the Invention
[0004] To address the issue of radioactive liquid remaining inside the pump body during disassembly of a shielded pump unit, this application provides a shielded pump unit for special environments.
[0005] The shielded pump unit for special environments provided in this application adopts the following technical solution: A shielded pump unit for special environments includes an outer cylinder with a detachable base. A pump body is mounted on the bottom wall of the base. An inlet pipe is mounted on the side wall of the outer cylinder. A suction port is formed at the bottom of the pump body. An outlet pipe is mounted on the outer side wall of the outer cylinder. A discharge pipe is mounted on the pump body, and the end of the discharge pipe is connected to the outlet pipe. The bottom wall of the inner cavity of the outer cylinder protrudes upward in the middle. The height of the bottom wall of the inner cavity of the outer cylinder gradually decreases from the center point towards the inner wall and forms a first guide portion. A discharge pipe is mounted inside the outer cylinder, and the bottom end of the discharge pipe is located at the bottom of the inner side wall of the outer cylinder.
[0006] By adopting the above technical solution, the radioactive liquid enters the outer cylinder from the inlet pipe, and the pump body sends the radioactive liquid from the outlet pipe into the outlet pipe through the suction port, thereby transporting the radioactive liquid. When it is necessary to disassemble the shielded pump group, the base is removed from the outer cylinder, and the base drives the pump body to move out of the outer cylinder. The radioactive liquid in the outer cylinder is drawn out through the drain pipe. When the remaining amount of radioactive liquid is small, under the action of the first guide, the radioactive liquid flows to the inner wall of the outer cylinder, so that the drain pipe can draw out the radioactive liquid remaining in the outer cylinder.
[0007] Preferably, a drainage groove is formed on the bottom wall of the inner cavity of the outer cylinder along its circumference. The height of the bottom wall of the inner cavity of the outer cylinder gradually decreases from the inner wall towards the center point and forms a second guide portion. The drainage groove is located between the first guide portion and the second guide portion. The drainage pipe includes a fixed pipe body, a floating pipe body, and a corrugated connecting pipe body. The fixed pipe body is fixedly installed inside the outer cylinder. The top end of the corrugated connecting pipe body is fixedly installed at the bottom end of the fixed pipe body. The bottom end of the corrugated connecting pipe body is fixedly connected to the top end of the floating pipe body. A float is provided on the floating pipe body. The floating pipe body is located directly above the drainage groove. The bottom end of the floating pipe body moves to abut against the bottom wall of the drainage groove. A drainage port is formed at the bottom end of the side wall of the floating pipe body. The inner diameter of the drainage port is smaller than the inner diameter of the floating pipe body.
[0008] By adopting the above technical solution, when a large amount of radioactive liquid remains in the outer cylinder, the radioactive liquid drives the floating tube to move upward through the float. At this time, the bottom end of the floating tube is above the drainage tank, and the radioactive liquid is sucked into the floating tube through the suction port at the bottom end of the floating tube. When the volume of radioactive liquid decreases, the radioactive liquid is poured into the drainage tank through the first guide and the second guide. The float drives the floating tube to move downward, and the bottom end of the floating tube moves to abut against the bottom wall of the drainage tank. At this time, the suction port at the bottom end of the floating tube is blocked, and the radioactive liquid in the drainage tank is sucked into the floating tube through the drainage port, thereby facilitating the drainage pipe to further suck out the radioactive liquid in the outer cylinder.
[0009] Preferably, a plurality of guide rods are fixedly provided on the top wall of the floating tube, and a plurality of guide grooves are provided on the bottom wall of the fixed tube, with the plurality of guide rods slidably disposed in the plurality of guide grooves respectively.
[0010] By adopting the above technical solution, when the floating tube moves up and down, it drives the guide rod to move in the guide groove. The guide rod and the guide groove work together to guide the up and down movement of the floating tube, making it easy for the bottom end of the floating tube to be accurately inserted into the draining tank.
[0011] Preferably, a guide tube is fixedly installed on the bottom wall of the outer cylinder along its own axis, a retaining ring is slidably installed on the guide tube, a float is installed on the retaining ring, the floating tube is fixedly installed through the retaining ring, the retaining ring moves to block the drain tank, an air inlet channel is opened in the guide tube, the top end of the air inlet channel is connected to the inner cavity of the outer cylinder, and the bottom end is connected to the drain tank.
[0012] By adopting the above technical solution, when the volume of radioactive liquid decreases, the float moves the floating tube up and down through the retaining ring. The guide tube limits the movement of the retaining ring. When the bottom end of the floating tube abuts the bottom wall of the drain tank, the retaining ring blocks the drain tank. At this time, the floating tube draws in radioactive liquid through the drain port. When the remaining amount of radioactive liquid is small, the air in the outer cylinder is drawn into the drain tank through the air inlet channel. The air moves towards the floating tube in the drain tank. During the movement of the air, the radioactive liquid remaining in the drain tank will flow towards the floating tube, which facilitates the further extraction of radioactive liquid from the drain tank.
[0013] Preferably, the floating tube and the guide tube are located on opposite sides of the retaining ring along the circumference of the outer cylinder, the float is arc-shaped, and there are two floats symmetrically arranged on the retaining ring.
[0014] By adopting the above technical solution, the two floats are symmetrically positioned on the retaining ring, making the movement of the floats and the retaining ring more stable, thereby making the movement of the floating tube body more stable.
[0015] Preferably, the bottom end of the air inlet channel has two air outlets, the air outlets are opposite in direction to the tangent of the drain trough, and multiple drain outlets are spaced apart along the circumference of the floating tube.
[0016] By adopting the above technical solution, the air inside the outer cylinder enters the drain tank from the two air outlets in opposite directions through the air inlet channel. The two streams of air move in opposite directions toward the floating tube in the drain tank, which facilitates the further extraction of radioactive liquid from the drain tank.
[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. Using the first guide section and the drain pipe, the radioactive liquid enters the outer cylinder from the inlet pipe. The pump body sends the radioactive liquid from the outlet pipe into the outlet pipe through the suction port, thereby transporting the radioactive liquid. When it is necessary to disassemble the shielded pump group, the base is removed from the outer cylinder. The base drives the pump body to move out of the outer cylinder. The radioactive liquid in the outer cylinder is drawn out through the drain pipe. When the remaining amount of radioactive liquid is small, under the action of the first guide section, the radioactive liquid flows to the inner wall of the outer cylinder, so that the drain pipe can draw out the radioactive liquid remaining in the outer cylinder. 2. With the help of the cooling gap, during the operation of the pump body, the radioactive liquid in the pump seat will flow through the lower bearing component and through the cooling gap. The radioactive liquid flows to the top of the pump casing through the cooling gap, then flows through the upper bearing component and through the rotor component, and finally flows back to the pump casing from the lower bearing component. The flow of the radioactive liquid will cool the inside of the pump body, thereby reducing the overheating of the pump body. 3. When a large amount of radioactive liquid remains in the outer cylinder through the drainage tank, the radioactive liquid moves upward through the float, causing the floating tube to rise. At this time, the bottom of the floating tube is above the drainage tank, and the radioactive liquid is drawn into the floating tube through the suction port at the bottom of the floating tube. When the volume of radioactive liquid decreases, the radioactive liquid is poured into the drainage tank through the first guide and the second guide. The float moves downward through the float, and the bottom of the floating tube moves to abut against the bottom wall of the drainage tank. At this time, the suction port at the bottom of the floating tube is blocked, and the radioactive liquid in the drainage tank is drawn into the floating tube through the drainage port, thus facilitating the further extraction of radioactive liquid from the outer cylinder by the drainage pipe. Attached Figure Description
[0018] Figure 1 This is a front cross-sectional view of the shielded pump unit for special environments in Embodiment 1 of this application; Figure 2 This is a top view of the shielded pump unit for special environments in Embodiment 1 of this application; Figure 3 This is a partial structural schematic diagram of the shielded pump unit for special environments in Embodiment 2 of this application; Figure 4 This is a partial structural cross-sectional view of the shielded pump unit for special environments in Embodiment 2 of this application; Figure 5 This is a partial structural diagram of the shielded pump unit for special environments in Embodiment 2 of this application, to highlight the float; Figure 6 This is a partial structural cross-sectional view of the shielded pump unit for special environments in Embodiment 2 of this application, highlighting the air intake channel.
[0019] Reference numerals in the attached drawings: 1. Outer cylinder; 2. Base; 3. Inlet pipe; 4. Suction port; 5. Outlet pipe; 6. Discharge pipe; 7. First guide section; 8. Pump body; 9. Drain pipe; 91. Fixed pipe body; 92. Floating pipe body; 93. Corrugated connecting pipe body; 13. Drain groove; 14. Second guide section; 15. Drain port; 16. Guide rod; 17. Guide groove; 18. Guide tube; 19. Retaining ring; 20. Float; 21. Air inlet channel; 22. Air outlet; 23. Slide groove; 24. Mounting base. Detailed Implementation
[0020] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.
[0021] This application discloses a shielded pump unit for special environments.
[0022] Reference Figure 1 and Figure 2A shielded pump assembly for special environments includes an outer cylinder 1 with an opening at its top. A base 2 is detachably and fixedly mounted on the outer cylinder 1 at the top opening using bolts. A pump body 8 is fixedly mounted on the middle of the bottom wall of the base 2, and a suction port 4 is formed at the bottom of the pump body 8.
[0023] An inlet pipe 3 and an outlet pipe 5 are fixedly installed on the side wall of the outer cylinder 1 along its own diameter. A liquid outlet pipe 6 is installed on the side wall of the pump body 8. A sliding groove 23 is opened on the inner wall of the outer cylinder 1 along its own axis. The end of the liquid outlet pipe 6 away from the pump body 8 is slidably installed in the sliding groove 23 and connected to the outlet pipe 5.
[0024] When the pump body 8 is running, the radioactive liquid enters the outer cylinder 1 from the inlet pipe 3. The pump body 8 sends the radioactive liquid into the outlet pipe 6 through the suction port 4, and the radioactive liquid then enters the outlet pipe 5, thus completing the delivery of the radioactive liquid.
[0025] The pump body 8 includes a pump casing, a pump base, a stator assembly, a rotor assembly, and an impeller. The pump casing is fixedly installed in the middle of the bottom wall of the base 2. The pump base is fixedly installed at the bottom of the pump casing, and the discharge pipe 6 is fixedly installed on the side wall of the pump base and communicates with the inner cavity of the pump base. The suction port 4 is located in the middle of the bottom wall of the pump base.
[0026] A mounting base 24 is fixedly installed in the middle of the base 2. An upper bearing component is installed at the bottom of the mounting base 24, and a lower bearing component is installed at the top of the pump base. The upper and lower bearing components are located on the upper and lower sides of the pump casing, respectively, and the upper and lower ends of the rotor component are installed in the upper and lower bearing components.
[0027] The impeller is fixedly mounted at the bottom of the rotor assembly and is located inside the pump base. The stator assembly is fixedly mounted inside the pump casing, and is sleeved on the outside of the rotor assembly, with an annular cooling gap forming between the stator assembly and the rotor assembly.
[0028] When the pump body 8 is in operation, the impeller is driven to rotate by the rotor assembly, drawing the radioactive liquid from the outer cylinder 1 into the pump base through the suction port 4. The radioactive liquid in the pump base then enters the outlet pipe 5 through the outlet pipe 6. Simultaneously, the drawn-in radioactive liquid forms a continuous cooling path as it flows through the pump's internal cavity: it first flows through the lower bearing assembly, enters the cooling gap between the stator and rotor assemblies, rises to the top of the pump casing, then flows through the upper bearing assembly and through the interior of the rotor assembly, finally returning to the lower bearing assembly and the pump casing. This circulating flow effectively removes the heat generated inside the pump body 8, achieving continuous cooling of the pump and preventing overheating.
[0029] The bottom wall of the pump base cavity gradually slopes downwards towards the suction port 4. The bottom wall of the outer cylinder 1 cavity is designed to bulge upwards in the middle, and its height gradually decreases from the center point towards the inner wall of the outer cylinder 1, forming the first guide section 7. A drain pipe 9 is fixedly installed on the side wall of the outer cylinder 1. The drain pipe 9 is located between the inlet pipe 3 and the outlet pipe 5 along the circumference of the outer cylinder 1, and the bottom end of the drain pipe 9 extends to near the bottom of the inner side wall of the outer cylinder 1.
[0030] The implementation principle of a shielded pump unit for special environments according to an embodiment of this application is as follows: When the shielded pump unit needs to be disassembled, the base 2 and the pump body 8 are removed together from the outer cylinder 1. The bottom wall of the pump base cavity is designed to gradually slope downwards towards the suction port 4. During the process of the pump body 8 being removed from the outer cylinder 1 along with the base 2, this inclined structure allows the radioactive liquid accumulated inside the pump casing and pump base to be completely discharged through the suction port 4 under the action of gravity, avoiding the residue of harmful liquid. Subsequently, the radioactive liquid accumulated in the outer cylinder 1 is pumped out through the drain pipe 9. When the liquid level drops to a low level, under the guidance of the first guide part 7, the residual radioactive liquid will naturally flow to the inner side wall area of the outer cylinder 1, thereby ensuring that the drain pipe 9 can effectively pump out the liquid retained at the bottom of the cylinder.
[0031] Example 2: Reference Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that an annular second guide portion 14 is formed on the outer periphery of the bottom wall of the inner cavity of the outer cylinder 1 at an angle, and the height of the second guide portion 14 gradually decreases from the inner wall of the outer cylinder 1 to the center of the outer cylinder 1. A drain groove 13 is provided on the bottom wall of the inner cavity of the outer cylinder 1. The drain groove 13 is annular along the circumference of the outer cylinder 1 and is located between the first guide portion 7 and the second guide portion 14.
[0032] Reference Figure 4 , Figure 5 and Figure 6 The drain pipe 9 includes a fixed pipe body 91, a floating pipe body 92, and a corrugated connecting pipe body 93. The fixed pipe body 91 is fixedly inserted into the side wall of the outer cylinder 1. The upper and lower ends of the corrugated connecting pipe body 93 are respectively fixedly connected to the bottom end of the fixed pipe body 91 and the top end of the floating pipe body 92, allowing the floating pipe body 92 to float up and down. Four guide rods 16 are fixedly installed on the top wall of the floating pipe body 92, and four guide grooves 17 are opened on the bottom wall of the fixed pipe body 91. The four guide rods are slidably installed in the four guide grooves 17, making the floating pipe body 92 float more stably.
[0033] The floating tube 92 is located directly above the drain trough 13. A guide tube 18 is fixedly installed inside the drain trough 13 of the outer cylinder 1 and on the side away from the floating tube 92 along its own diameter. A retaining ring 19 is slidably installed on the guide tube 18 along the axis of the outer cylinder 1. The retaining ring 19 is located directly above the drain trough 13. The retaining ring 19 can block the drain trough 13 by moving downward.
[0034] A retaining ring 19 is fixedly installed through the floating tube 92. Two floats 20 are fixedly installed on the bottom wall of the retaining ring 19. The floats 20 are arc-shaped along the circumference of the retaining ring 19, and the two floats 20 are symmetrically installed along the line connecting the floating tube 92 and the guide tube 18. When the retaining ring 19 moves downward to block the drain trough 13, the two floats 20 move into the drain trough 13, and the bottom wall of the floats 20 does not contact the bottom wall of the drain trough 13.
[0035] The bottom wall of the floating tube 92 has four semi-circular drain ports 15 evenly spaced along its circumference. The inner diameter of each drain port 15 is smaller than the inner diameter of the floating tube 92. When the floating tube 92 moves downward, its bottom end can be inserted into the drain trough 13. When the bottom end of the floating tube 92 abuts against the bottom wall of the drain trough 13, the floating tube 92 is connected to the drain trough 13 through the four drain ports 15.
[0036] An air inlet channel 21 is provided inside the conduit 18. The top end of the air inlet channel 21 is connected to the inner cavity of the outer cylinder 1. Two air outlets 22 are formed at the bottom end of the air inlet channel 21. The air outlets 22 are opposite in direction to the tangent of the drain trough 13, and the air outlets 22 are connected to the drain trough 13.
[0037] The implementation principle of Embodiment 2 of this application is as follows: When there is a large amount of radioactive liquid in the outer cylinder 1, the float 20, under the buoyancy of the liquid surface, drives the floating tube 92 to move upward, raising its bottom end above the drain tank 13. At this time, the radioactive liquid directly enters the tube body through the suction port at the bottom end of the floating tube 92, achieving rapid drainage. As the liquid level drops, the residual liquid flows into the drain tank 13 under the guidance of the first guide 7 and the second guide 14. At the same time, the float 20, as the liquid level drops, drives the floating tube 92 to move downward until its bottom end abuts the bottom wall of the drain tank 13. At this time, the suction port is closed by the bottom wall of the drain tank 13, and the liquid collected in the drain tank 13 is sucked into the floating tube 92 through the drain port 15, thereby realizing the extraction of residual liquid. When the bottom end of the floating tube 92 abuts against the bottom wall of the drain tank 13, the retaining ring 19 moves simultaneously to block the drain tank 13. When the amount of radioactive liquid remaining in the drain tank 13 is small, the air in the outer cylinder 1 is drawn into the drain tank 13 through the air inlet channel 21. The air moves towards the floating tube 92 in the drain tank 13. During the movement of the air, the radioactive liquid remaining in the drain tank 13 will flow towards the floating tube 92, which will facilitate the further extraction of the radioactive liquid in the drain tank 13.
[0038] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.
Claims
1. A shielded pump unit for special environments, characterized in that: The device includes an outer cylinder (1), on which a base (2) is detachably mounted. A pump body (8) is mounted on the bottom wall of the base (2). An inlet pipe (3) is mounted on the side wall of the outer cylinder (1). A suction port (4) is formed at the bottom of the pump body (8). An outlet pipe (5) is mounted on the outer side wall of the outer cylinder (1). A liquid outlet pipe (6) is mounted on the pump body (8). The end of the liquid outlet pipe (6) is connected to the outlet pipe (5). The bottom wall of the inner cavity of the outer cylinder (1) protrudes upward in the middle. The height of the bottom wall of the inner cavity of the outer cylinder (1) gradually decreases from the center point towards the inner wall and forms a first guide part (7). A drain pipe (9) is mounted inside the outer cylinder (1). The bottom end of the drain pipe (9) is located at the bottom of the inner side wall of the outer cylinder (1).
2. A shielded pump unit for special environments according to claim 1, characterized in that: The outer cylinder (1) has a drainage groove (13) circumferentially formed on the bottom wall of its inner cavity. The height of the bottom wall of the outer cylinder (1) gradually decreases from the inner wall towards the center point and forms a second guide part (14). The drainage groove (13) is located between the first guide part (7) and the second guide part (14). The drainage pipe (9) includes a fixed pipe body (91), a floating pipe body (92), and a corrugated connecting pipe body (93). The fixed pipe body (91) is fixedly installed inside the outer cylinder (1), and the corrugated connecting pipe body (93) The top end is fixedly set at the bottom end of the fixed tube body (91), the bottom end of the corrugated connecting tube body (93) is fixedly connected to the top end of the floating tube body (92), the floating tube body (92) is provided with a float (20), the floating tube body (92) is located directly above the drain tank (13), the bottom end of the floating tube body (92) moves to abut against the bottom wall of the drain tank (13), the bottom end of the side wall of the floating tube body (92) is provided with a drain port (15), the inner diameter of the drain port (15) is smaller than the inner diameter of the floating tube body (92).
3. A shielded pump unit for special environments according to claim 2, characterized in that: Multiple guide rods (16) are fixedly installed on the top wall of the floating tube (92), and multiple guide grooves (17) are opened on the bottom wall of the fixed tube (91). The multiple guide rods (16) are slidably installed in the multiple guide grooves (17).
4. A shielded pump unit for special environments according to claim 2, characterized in that: The outer cylinder (1) is fixedly provided with a guide tube (18) along its own axis on the bottom wall of the drain tank (13). A retaining ring (19) is slidably provided on the guide tube (18). The float (20) is provided on the retaining ring (19). The floating tube (92) is fixedly provided through the retaining ring (19). The retaining ring (19) moves to block the drain tank (13). An air inlet channel (21) is provided in the guide tube (18). The top end of the air inlet channel (21) is connected to the inner cavity of the outer cylinder (1), and the bottom end is connected to the drain tank (13).
5. A shielded pump unit for special environments according to claim 4, characterized in that: The floating tube (92) and the guide tube (18) are located on the symmetrical sides of the retaining ring (19) along the circumference of the outer cylinder (1). The float (20) is set in an arc shape. There are two floats (20), and the two floats (20) are symmetrically arranged on the retaining ring (19).
6. A shielded pump unit for special environments according to claim 5, characterized in that: The bottom end of the air inlet channel (21) has two air outlets (22), and the air outlets (22) are opposite in direction to the tangent of the drain trough (13). The drain outlets (15) are spaced apart along the circumference of the floating tube (92).