Sealing structure of molten pool liquid metal pump

Abstract

The invention discloses a sealing structure of a molten pool liquid metal pump, and belongs to the technical field of nuclear reactor pump body sealing, the sealing structure comprises a molten pool and a pump body, the molten pool is provided with a pipe nozzle, and an outlet of the pump body is matched with the pipe nozzle through a sealing assembly; the sealing assembly comprises a pressing plate and a sealing piece, and the sealing piece is arranged between the pipe nozzle and the outer wall of the outlet of the pump body and pressed in the pipe nozzle by the pressing plate. In the scheme, the pressing plate can press the sealing element on the outer side walls of the pipe nozzle and the outlet of the pump body, the sealing performance between the pipe nozzle and the pump body is guaranteed, the pressing plate can prevent the sealing element from being separated from a gap between the pipe nozzle and the pump body, and when the temperature of the molten pool type metal reactor rises, the sealing element is prevented from being separated from the gap. The sealing piece can generate thermal expansion to be further tightly matched with the pipe nozzle, the pressing plate and the pump body opening, and therefore the sealing performance is further improved.

Description

Technical Field

[0001] The invention relates to a sealing structure, and more particularly to a sealing structure of a molten pool liquid metal pump. Background Art

[0002] The liquid metal pump is generally installed in the metal molten pool, firmly fixed on the top of the molten pool by the pump cover, and the pump outlet is inserted into the nozzle at the bottom of the molten pool. Since the liquid metal pump needs to be disassembled and repaired regularly, and during the disassembly, personnel cannot enter the molten pool to work, a loose connection must be adopted between the pump outlet and the molten pool nozzle. At the same time, in order to ensure that the pump has a high working efficiency, the leakage rate between the pump outlet and the molten pool nozzle must be controlled at an extremely low level. This puts extremely high demands on the sealing performance of this part, and it is necessary to achieve the goal of small leakage and high sealing performance. During the operation of the liquid metal pump, its temperature rise is often inconsistent with that of the molten pool, which causes relative radial and axial displacement between the pump outlet and the nozzle. Therefore, the seal between the pump outlet and the nozzle needs to meet multiple complex requirements such as loose connection, good sealing performance, and adaptation to relative displacement.

[0003] For example: Chinese patent announcement number CN105387213A, announcement date March 9, 2016, invention title is a magnetic liquid and mechanical seal combined sealing device suitable for nuclear reactor main pump sealing, the application discloses a pump body sealing structure, including a permanent magnet moving ring, a moving ring sealing ring, a composite static ring, a sealing seat, a static ring sealing ring and a spring and a permanent magnet, etc. The permanent magnet moving ring and the shaft sleeve are sealed with a moving ring sealing ring, and the composite static ring and the sealing seat are sealed with a static ring sealing ring; the permanent magnet moving ring and the composite static ring are pressed and fitted by the spring preload force, and the magnetic pole direction of the permanent magnet moving ring is opposite to the magnetic pole direction of the annular permanent magnet embedded in the composite static ring. The application can solve the problem that the reactor main pump seal is difficult to achieve zero leakage, but the sealing structure is complex and cannot effectively adapt to temperature changes, and the sealing performance is difficult to guarantee. Summary of the invention

[0004] The present invention overcomes the problems of poor sealing and complex structure of the pump body in the molten pool reactor, and provides a sealing structure for a molten pool liquid metal pump. This solution can adapt to temperature changes in the reactor and achieve a good sealing effect between the pump body and the reactor nozzle.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a sealing structure of a molten pool liquid metal pump, including a molten pool and a pump body, the molten pool is provided with a nozzle, the outlet of the pump body cooperates with the nozzle through a sealing assembly; the sealing assembly includes a pressure plate and a sealing member, the sealing member is arranged between the outer wall of the nozzle and the pump body outlet and is pressed into the nozzle by the pressure plate. In this solution, the pressure plate can press the sealing member on the outer wall at the nozzle and the pump body outlet to ensure the sealing performance between the nozzle and the pump body, the pressure plate can prevent the sealing member from escaping from the gap between the nozzle and the pump body, and when the temperature of the molten pool metal reactor rises, the sealing member can generate thermal expansion and further closely cooperate with the nozzle, the pressure plate and the pump body outlet, thereby further improving the sealing performance.

[0006] Preferably, the pressure plate and the seal are annular structures, the pressure plate and the seal are sleeved on the outside of the pump body, the pressure plate and the pump body are clearance-fitted, and the inner wall of the seal is transitionally fitted with the pump body. The pressure plate and the seal are annular structures sleeved on the outside of the pump body and between the nozzle, the inner diameter side of the pressure plate and the pump body are clearance-fitted to ensure that the pump body can pass through the position of the pressure plate normally, and the inner diameter side of the seal is transitionally fitted with the pump body, and sliding can also occur between the pump body and the seal, which is conducive to ensuring the sealing performance while facilitating the disassembly and maintenance between the pump body and the nozzle. Therefore, the seal needs to have wear-resistant properties.

[0007] Preferably, the nozzle is provided with a first step and a second step, the pressure plate is fixed on the first step, and the sealing member is provided on the second step. The first step on the nozzle is used to place the pressure plate, which is fixed on the first step of the nozzle by means of screws or other fixing members, and the sealing member is located on the second step, and the sealing member can be axially limited by the first step and the pressure plate.

[0008] Preferably, the sealing member is provided with a sealing lip on one side close to the second step, and the inner diameter of the sealing lip is smaller than the outer diameter of the pump body outlet. The sealing lip can further promote the sealing effect between the sealing member and the pump body, and when the pump body is inserted into the nozzle position, it can further press against the position where the sealing lip is located, and multiple sealing surfaces are generated between the sealing lip and the pump body and the nozzle, thereby improving the sealing effect.

[0009] Preferably, the seal is provided with a guide portion on one side close to the pressure plate, and a continuously distributed sealing ring is provided on one side close to the pump body. The guide portion on the seal can provide a guide for the nozzle inserted into the pump body outlet, so that the pump body and the seal can be matched. While ensuring the sealing effect, the sealing ring can also reduce the contact area between the seal and the pump body, thereby reducing friction, which is conducive to the installation of the pump body inside the seal.

[0010] Preferably, there is a clearance fit between the outside of the seal and the nozzle, and there is a clearance fit between the seal and the pressure plate. The clearance fit between the outer wall of the seal and the nozzle ensures that the seal can produce a certain height of radial displacement in the nozzle, and the clearance fit between the seal and the pressure plate ensures that the seal also has a certain displacement capacity in the axial direction, so that the seal can adapt to the temperature rise changes in the molten pool and provide sufficient displacement space between the pump body and the molten pool.

[0011] Preferably, it further comprises a first fixing ring, the first fixing ring is arranged between the pressure plate and the sealing member, the guide part is arranged on the side of the smallest inner diameter of the first fixing ring, and the side of the guide part close to the pressure plate is flush with the side of the first fixing ring close to the pressure plate. The first fixing ring can limit the deformation direction of the sealing member, and when the outlet end of the pump body is inserted into the sealing member, a certain extrusion force is exerted on the sealing member. Due to the existence of the first fixing ring, a certain pressure is formed inside the sealing member, so that when the sealing member is deformed, it can only protrude toward the bottom side of the pressure plate, thereby achieving a tight seal between the sealing member and the pressure plate, thereby improving the sealing effect.

[0012] Preferably, a second fixing ring is further included, the second fixing ring is arranged between the sealing member and the second step, and a through hole is formed between the first fixing ring and the second fixing ring and close to the inner wall of the nozzle. The second fixing ring can also limit the deformation direction of the sealing member, the first fixing ring and the second fixing ring are arranged at intervals, and a through hole is formed between the first fixing ring and the second fixing ring, so that when the outlet end of the pump body is inserted into the sealing member, the internal pressure of the sealing member increases, and due to the existence of the first fixing ring and the second fixing ring, the pressure of the sealing member can only be released toward one side of the through hole, thereby deforming toward one side of the through hole, so that the sealing member and the inner wall of the nozzle can also produce a sealed fit, thereby improving the sealing effect.

[0013] Preferably, the minimum radial dimension of the second fixing ring is greater than the minimum radial dimension of the sealing lip. When the pump body nozzle is inserted into the inner side of the seal, it can be squeezed with the sealing lip and press the sealing lip toward the second fixing ring and the second step, so that multiple sealing surfaces can be formed to improve the sealing effect.

[0014] Preferably, the pressing plate is provided with a guiding inclined surface on one side close to the outer wall of the pump body. The guiding inclined surface on the pressing plate is conducive to better assembly of the outlet end of the pump body into the nozzle.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) a loose connection is achieved between the pump and the nozzle. A radial gap is left between the seal and the pump body, so that the pump can be freely disassembled and assembled without hindrance during maintenance, greatly improving the maintenance efficiency; (2) when the working fluid leaks from the tiny gap between the seal and the pump body, the flow resistance will increase greatly due to the small gap value, thereby effectively ensuring that the leakage is at an extremely low level; (3) a large relative displacement is allowed between the pump body and the molten pool nozzle. There is no axial fixation between the pump and the seal, which allows the pump to move freely in the axial direction when heated. At the same time, a large radial gap is reserved between the seal and the molten pool, allowing the pump to move freely in the radial direction within this range with the seal after being heated, fully adapting to the relative displacement caused by the temperature change between the pump and the molten pool during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the present invention.

[0017] Figure 2 It is another schematic diagram of the present invention.

[0018] Figure 3 for Figure 1 A is an enlarged schematic diagram.

[0019] Figure 4 It is a schematic diagram of another sealing form between the outlet end of the pump body and the nozzle of the present invention.

[0020] In the figure: 1. molten pool, 2. pump body, 2.1. pump head, 2.2. pump body outlet, 2.3. feed port, 3. nozzle, 4. pressure plate, 5. seal, 6. first step, 6.1. horizontal plane of the first step, 6.2. vertical cylinder of the first step, 7. second step, 7.1. horizontal plane of the second step, 7.2. vertical cylinder of the second step, 8. sealing lip, 9. guide part, 10. sealing ring, 11. first fixing ring, 12. second fixing ring, 13. through hole, 14. guide slope, 15. top cover, 16. liquid outlet, 17. mounting hole, 18. feed port. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0022] Example 1: Figures 1 to 3The sealing structure of a molten pool liquid metal pump shown in the figure includes a molten pool 1 and a pump body 2. The molten pool 1 contains a liquid metal reactor. The pump body 2 includes a pump head 2.1 and a pump body outlet 2.2. A top cover 15 is provided on the top of the molten pool 1, and a liquid outlet 16 is provided on the bottom of the molten pool 1. A nozzle 3 is arranged at the position of the liquid outlet 16. Corresponding to the position of the nozzle 3, a mounting hole 17 is provided on the top cover 15 for mounting the pump head 2.1 end of the pump body 2. The outlet end of the pump body 2 is vertically inserted into the mounting hole 17 of the top cover 15 and a sealing assembly is used to achieve sealing at the position of the nozzle 3 at the bottom of the molten pool 1. One end of the pump head 2.1 is mounted on the top cover 15 through a fixing. Figure 1 and Figure 2 The schematic diagrams are respectively the structural diagrams when one group of pump bodies 2 and two groups of pump bodies 2 are arranged in the molten pool 1. A feed port 18 is also arranged at the bottom of the molten pool 1, and a feed port 2.3 is arranged on the pump body 2. The feed port 2.3 is arranged in the middle of the pump body 2. The feed port 18 can continuously supply liquid metal, and the reacted liquid metal is transported to the pump body outlet 2.2 through the feed port 2.3 through the pump body 2, and finally discharged at the nozzle 3. The sealing structure of this scheme is aimed at the sealing between the nozzle 3 position and the pump body 2 outlet, reducing the leakage rate between the pump body 2 and the nozzle 3.

[0023] The nozzle 3 is a cylindrical ring structure. The nozzle 3 and the bottom of the molten pool 1 can be fixed by welding or other methods, and the sealing effect between the nozzle 3 and the molten pool 1 is ensured. A first step 6 and a second step 7 are arranged on the inner side of the nozzle 3. The first step 6 is arranged on the top of the nozzle 3, and the second step 7 is arranged on the side of the nozzle 3 close to the bottom of the molten pool 1, that is, the height position of the first step 6 is higher than the height position of the second step 7. The pressing plate 4 is arranged on the first step 6. Figure 3 As shown, the pressure plate 4 is a hollow circular ring structure, a fixing installation hole is provided on the pressure plate 4, and a threaded hole is provided on the first step 6. A fastener is passed through the fixing installation hole and threadedly connected to the threaded hole on the first step 6 to fix the pressure plate 4 and the first step 6. It should be noted that the first step 6 includes a first step horizontal plane 6.1 and a first step vertical cylindrical surface 6.2, and the horizontal plane and the vertical cylindrical surface on the first step 6 form the first step 6; the lower surface of the pressure plate 4 is close to the first step horizontal plane 6.1, and the upper surface of the pressure plate 4 is flush with the top plane of the nozzle 3, and the inner diameter of the pressure plate 4 is smaller than the inner diameter of the first step 6, that is, after the pressure plate 4 is installed on the first step 6, the end of the pressure plate 4 close to the pump body 2 protrudes from the first step horizontal plane 6.1 and is located above the second step 7, thereby forming a space for accommodating the seal 5 on the pressure plate 4 and the second step 7.

[0024] It should also be noted that there is a clearance fit between the inner diameter side of the pressing plate 4 and the pump body 2, and a certain distance is maintained between the inner diameter side of the pressing plate 4 and the pump body 2, so that the pump body 2 can slide relative to the inner diameter side of the pressing plate 4. Similarly, there is also a clearance fit between the outer diameter side of the pressing plate 4 and the vertical cylindrical surface 6.1 of the first step, which can ensure that the pressing plate 4 can be installed on the first step surface 6 on the one hand, and on the other hand, it can allow the pressing plate 4 to have a certain deformation space when it expands and contracts at high temperatures. Usually, the metal temperature in the molten pool 1 is generally between 200°C and 420°C. When working normally, the pump body 2, the molten pool 1, and the metal liquid are basically isothermal, which is equal to the temperature of the metal solution.

[0025] A guide slope 14 is also provided on the upper surface of the pressure plate 4. The guide slope 14 is a circular cone, and the radial dimension of the guide slope 14 gradually decreases from top to bottom. When the outlet of the pump body 2 is inserted into the nozzle 3 position, the guide slope 14 can provide a guiding effect for the pump body outlet 2.2, making it easier for the pump body 2 to be inserted into the pressure plate 4 and the seal 5.

[0026] like Figure 3 As shown, the sealing assembly also includes a sealing member 5, which is also a hollow circular ring structure, that is, the sealing member 5 is a sealing ring structure, and the sealing member 5 is arranged on the second step 7. Similarly, the second step 7 includes a second step horizontal plane 7.1 and a second step vertical cylinder 7.2, the second step vertical cylinder 7.2 and the first step horizontal plane 6.1 are directly connected, and the first step 6 and the second step 7 are continuously distributed steps; wherein the height dimension of the second step vertical cylinder 7.2 is greater than the height dimension of the first step vertical cylinder 6.2, that is, the thickness of the pressure plate 4 is less than the axial length of the sealing member 5, and the axial length of the sealing member 5 is set larger to effectively increase the contact area between the sealing member 5 and the pump body 2, thereby improving the sealing effect.

[0027] The seal 5 is arranged in the space formed between the lower surface of the pressure plate 4, the second step vertical cylinder 7.2, the second step horizontal plane 7.1 and the outer wall of the pump body 2, wherein the axial length of the seal 5 is slightly smaller than the distance between the lower surface of the pressure plate 4 and the second step horizontal plane 7.1, so that the seal 5 has a certain moving space in the axial direction, but the axial gap is small, otherwise it is easy to cause a large leakage between the pump body 2 and the nozzle 3, which can effectively control the leakage. The outer wall of the seal 5 and the second step vertical cylinder 7.2 are clearance-matched, and when the pump body 2 is matched with the inner side of the seal 5, it can ensure that the pump body 2 also has a large displacement in the radial direction, which is convenient for the disassembly of the pump body 2.

[0028] In order to ensure the seal between the pump body 2 and the nozzle 3, a transition fit is provided between the inner side of the seal 5 and the outer side wall of the pump body outlet 2.2. In this way, a certain sliding can be generated between the pump body 2 and the seal 5, ensuring that the pump body 2 can be installed on the inner side of the seal 5 and form a certain tight fit, ensuring the sealing effect between the inner side wall of the seal 5 and the outer side wall of the pump body 2.

[0029] It should be noted that the radial dimension of the inner diameter side of the pressure plate 4 is larger than the radial dimension of the inner diameter side of the seal 5, so as to ensure that the pump body 2 can contact the inner side wall of the seal 5 and try not to contact the inner diameter side of the pressure plate 4. A guide portion 9 is provided on the side of the seal 5 close to the lower surface of the pressure plate 4. The guide portion 9 is provided in the vertical space between the pressure plate 4 and the pump body 2, that is, the guide portion 9 protrudes from the radial inner side of the pressure plate 4. A conical surface is also provided on the guide portion 9, and the radial dimension of the guide portion 9 gradually increases from top to bottom; when the outlet end of the pump body 2 is inserted to contact the top of the seal 5, the pump body 2 can be guided to the inner side wall of the seal 5 under the action of the guide portion 9, so as to avoid the seal 5 being crushed when the pump body 2 is pressed into the seal 5.

[0030] Several groups of sealing rings 10 are also arranged on the inner side wall of the sealing member 5. The sealing rings 10 are continuous grooves and protrusions distributed in the vertical direction on the inner side wall of the sealing member 5. The grooves and protrusions are continuously distributed. While ensuring the sealing effect, the sealing rings 10 can also reduce the contact area between the sealing member 5 and the pump body 2, thereby reducing friction, which is conducive to the installation of the pump body 2 on the inner side of the sealing member 5. In addition, the protrusion structure on the sealing ring 10 is also more likely to deform. After the outlet end of the pump body 2 passes through the guide portion 9, it contacts the sealing ring 10 below in turn, and an axial force is applied to the protrusion on the sealing ring 10, so that the protrusion can produce a certain deviation toward the axial groove, and the protrusion can also press against the outer wall of the pump body 2, thus achieving effective sealing.

[0031] This solution can significantly improve the sealing performance of the liquid metal pump through the axial and radial design of the sealing component, thereby effectively increasing the overall efficiency of the pump body. At the same time, the sealing structure greatly improves the efficiency of disassembly and assembly during maintenance, providing great convenience for the maintenance and maintenance of the liquid metal pump. This can not only bring significant economic benefits, but also reduce equipment maintenance costs and improve production efficiency.

[0032] Example 2: Figure 1 , Figure 2 as well as Figure 4The sealing structure of a molten pool liquid metal pump shown in the figure includes a molten pool 1 and a pump body 2. The molten pool 1 contains a liquid metal reactor. The pump body 2 includes a pump head 2.1 and a pump body outlet 2.2. A top cover 15 is provided on the top of the molten pool 1, and a liquid outlet 16 is provided on the bottom of the molten pool 1. A nozzle 3 is arranged at the position of the liquid outlet 16. Corresponding to the position of the nozzle 3, a mounting hole 17 is provided on the top cover 15 for mounting the pump head 2.1 end of the pump body 2. The outlet end of the pump body 2 is vertically inserted into the mounting hole 17 of the top cover 15 and a sealing assembly is used to achieve sealing at the position of the nozzle 3 at the bottom of the molten pool 1. One end of the pump head 2.1 is mounted on the top cover 15 through a fixing. Figure 1 and Figure 2 The schematic diagrams are respectively the structural diagrams when one group of pump bodies 2 and two groups of pump bodies 2 are arranged in the molten pool 1. A feed port 18 is also arranged at the bottom of the molten pool 1, and a feed port 2.3 is arranged on the pump body 2. The feed port 2.3 is arranged in the middle of the pump body 2. The feed port 18 can continuously supply liquid metal, and the reacted liquid metal is transported to the pump body outlet 2.2 through the feed port 2.3 through the pump body 2, and finally discharged at the nozzle 3. The sealing structure of this scheme is aimed at the sealing between the nozzle 3 position and the pump body 2 outlet, reducing the leakage rate between the pump body 2 and the nozzle 3.

[0033] The nozzle 3 is a cylindrical ring structure. The nozzle 3 and the bottom of the molten pool 1 can be fixed by welding or other methods, and the sealing effect between the nozzle 3 and the molten pool 1 is ensured. A first step 6 and a second step 7 are arranged on the inner side of the nozzle 3. The first step 6 is arranged on the top of the nozzle 3, and the second step 7 is arranged on the side of the nozzle 3 close to the bottom of the molten pool 1, that is, the height position of the first step 6 is higher than the height position of the second step 7. The pressing plate 4 is arranged on the first step 6. Figure 4 As shown, the pressure plate 4 is a hollow circular ring structure, a fixing installation hole is provided on the pressure plate 4, and a threaded hole is provided on the first step 6. A fastener is passed through the fixing installation hole and threadedly connected to the threaded hole on the first step 6 to fix the pressure plate 4 and the first step 6. It should be noted that the first step 6 includes a first step horizontal plane 6.1 and a first step vertical cylindrical surface 6.2, and the horizontal plane and the vertical cylindrical surface on the first step 6 form the first step 6; the lower surface of the pressure plate 4 is close to the first step horizontal plane 6.1, and the upper surface of the pressure plate 4 is flush with the top plane of the nozzle 3, and the inner diameter of the pressure plate 4 is smaller than the inner diameter of the first step 6, that is, after the pressure plate 4 is installed on the first step 6, the end of the pressure plate 4 close to the pump body 2 protrudes from the first step horizontal plane 6.1 and is located above the second step 7, thereby forming a space for accommodating the seal 5 on the pressure plate 4 and the second step 7.

[0034] It should also be noted that there is a clearance fit between the inner diameter side of the pressing plate 4 and the pump body 2, and a certain distance is maintained between the inner diameter side of the pressing plate 4 and the pump body 2, so that the pump body 2 can slide relative to the inner diameter side of the pressing plate 4. Similarly, there is also a clearance fit between the outer diameter side of the pressing plate 4 and the vertical cylindrical surface 6.1 of the first step, which can ensure that the pressing plate 4 can be installed on the first step surface 6 on the one hand, and on the other hand, it can allow the pressing plate 4 to have a certain deformation space when it expands and contracts at high temperatures. Usually, the metal temperature in the molten pool 1 is generally between 200°C and 420°C. When working normally, the pump body 2, the molten pool 1, and the metal liquid are basically isothermal, which is equal to the temperature of the metal solution.

[0035] A guide slope 14 is also provided on the upper surface of the pressure plate 4. The guide slope 14 is a circular cone, and the radial dimension of the guide slope 14 gradually decreases from top to bottom. When the outlet of the pump body 2 is inserted into the nozzle 3 position, the guide slope 14 can provide a guiding effect for the pump body outlet 2.2, making it easier for the pump body 2 to be inserted into the pressure plate 4 and the seal 5.

[0036] like Figure 4 As shown, the sealing assembly also includes a sealing member 5, which is also a hollow circular ring structure, that is, the sealing member 5 is a sealing ring structure, and the sealing member 5 is arranged on the second step 7. Similarly, the second step 7 includes a second step horizontal plane 7.1 and a second step vertical cylinder 7.2, the second step vertical cylinder 7.2 and the first step horizontal plane 6.1 are directly connected, and the first step 6 and the second step 7 are continuously distributed steps; wherein the height dimension of the second step vertical cylinder 7.2 is greater than the height dimension of the first step vertical cylinder 6.2, that is, the thickness of the pressure plate 4 is less than the axial length of the sealing member 5, and the axial length of the sealing member 5 is set larger to effectively increase the contact area between the sealing member 5 and the pump body 2, thereby improving the sealing effect.

[0037] The seal 5 is also provided with a first fixing ring 11 and a second fixing ring 12. The seal 5, the first fixing ring 11 and the second fixing ring 12 are arranged in the space formed between the lower surface of the pressure plate 4, the second step vertical cylinder 7.2, the second step horizontal plane 7.1 and the outer wall of the pump body 2. The axial length of the seal 5 is slightly smaller than the distance between the lower surface of the pressure plate 4 and the second step horizontal plane 7.1. This allows the seal 5 to have a certain moving space in the axial direction, but the axial gap is small, otherwise it is easy to cause a large leakage between the pump body 2 and the nozzle 3, which can effectively control the leakage. The outer wall of the seal 5 and the second step vertical cylinder 7.2 are clearance-matched. When the pump body 2 is matched with the inner side of the seal 5, it can ensure that the pump body 2 also has a large displacement in the radial direction, which is convenient for the disassembly of the pump body 2.

[0038] The first fixing ring 11 is arranged between the top of the outer diameter side of the seal 5 and the lower surface of the pressure plate 4. The vertical cross section of the first fixing ring 11 is an inverted L-shape. The upper surface of the first fixing ring 11 is flush with the upper end surface of the seal 5, so that the guide portion 9 of the seal 5 will be located on the radial inner side of the first fixing ring 11, and the guide portion 9 can be partially aligned with the inner diameter side of the pressure plate 4; the outer diameter side of the first fixing ring 11 is flush with the outer diameter side of the seal 5, and is a clearance fit with the second step vertical cylindrical surface 7.2; the second fixing ring 12 is arranged on the outer diameter side of the seal 5 Between the bottom and the second step horizontal plane 7.1, the vertical cross-section of the second fixing ring 12 is L-shaped, so that the seal 5 can be effectively fixed by the first fixing ring 11 and the second fixing ring 12, and the displacement effect of the seal 5 in the nozzle 3 can still be guaranteed. It should be noted that the first fixing ring 11 and the second fixing ring 12 are distributed at intervals, so that a through hole 13 can be formed between the first sealing ring 11 and the second sealing ring 12, and the outer diameter side of the seal 5 is clamped between the through holes of the first fixing ring 11 and the second fixing ring 12.

[0039] In addition, due to the presence of the first fixing ring 11 and the second fixing ring 12, when pressure is generated inside the seal 5 (through external mechanical application, such as the pump body 2, or internal temperature rise), it is easy to deform. The first fixing ring 11 and the second fixing ring 12 can limit the deformation direction of the seal 5. Specifically, after the outlet end of the pump body 2 is inserted into the seal 5, a certain extrusion force is generated on the seal 5. Due to the presence of the first fixing ring 11, a certain pressure is formed inside the seal 5. In this way, when the seal 5 is deformed, it can only protrude toward the bottom side of the pressure plate 4, so that the seal 5 and the pressure plate 4 are compressed and sealed, thereby improving the sealing effect; when the outlet end of the pump body 2 continues to be inserted into the sealing ring 10 in the seal 5, the internal pressure of the seal 5 increases. Due to the presence of the first fixing ring 11 and the second fixing ring 12, the pressure of the seal 5 can only be released toward the side of the through hole 13, thereby deforming toward the side of the through hole 13, so that the seal 5 and the inner wall of the nozzle 3 (the second step vertical cylindrical surface 7.2) can also produce a sealed fit, thereby improving the sealing effect.

[0040] In order to ensure the seal between the pump body 2 and the nozzle 3, a transition fit is provided between the inner side of the seal 5 and the outer side wall of the pump body outlet 2.2. In this way, a certain sliding can be generated between the pump body 2 and the seal 5, ensuring that the pump body 2 can be installed on the inner side of the seal 5 and form a certain tight fit, ensuring the sealing effect between the inner side wall of the seal 5 and the outer side wall of the pump body 2.

[0041] It should be noted that the radial dimension of the inner diameter side of the pressure plate 4 is larger than the radial dimension of the inner diameter side of the seal 5, so as to ensure that the pump body 2 can contact the inner side wall of the seal 5 and try not to contact the inner diameter side of the pressure plate 4. A guide portion 9 is provided on the side of the seal 5 close to the lower surface of the pressure plate 4. The guide portion 9 is provided in the vertical space between the pressure plate 4 and the pump body 2, that is, the guide portion 9 protrudes from the radial inner side of the pressure plate 4. A conical surface is also provided on the guide portion 9, and the radial dimension of the guide portion 9 gradually increases from top to bottom; when the outlet end of the pump body 2 is inserted to contact the top of the seal 5, the pump body 2 can be guided to the inner side wall of the seal 5 under the action of the guide portion 9, so as to avoid the seal 5 being crushed when the pump body 2 is pressed into the seal 5.

[0042] Several groups of sealing rings 10 are also arranged on the inner side wall of the sealing member 5. The sealing rings 10 are continuous grooves and protrusions distributed in the vertical direction on the inner side wall of the sealing member 5. The grooves and protrusions are continuously distributed. While ensuring the sealing effect, the sealing rings 10 can also reduce the contact area between the sealing member 5 and the pump body 2, thereby reducing friction, which is conducive to the installation of the pump body 2 on the inner side of the sealing member 5. In addition, the protrusion structure on the sealing ring 10 is also more likely to deform. After the outlet end of the pump body 2 passes through the guide portion 9, it contacts the sealing ring 10 below in turn, and an axial force is applied to the protrusion on the sealing ring 10, so that the protrusion can produce a certain deviation toward the axial groove, and the protrusion can also press against the outer wall of the pump body 2, thus achieving effective sealing.

[0043] A sealing lip 8 is also provided on the inner wall of the sealing member 5. The sealing lip 8 is provided below the sealing ring 10. The sealing lip 8 is also an annular structure. The minimum radial dimension of the sealing lip 8 is smaller than the radial dimension of the outer wall of the pump body 2 and smaller than the radial dimension of the second fixing ring 12. In this way, when the outlet 2.2 end of the pump body is pressed into the interior of the sealing member 5 and is pressed tightly against the sealing lip 8, the sealing lip 8 is deflected downward. At this time, the upper surface of the sealing lip 8 forms a compression seal with the outer diameter side of the pump body 2, and the lower surface of the sealing lip 8 forms a compression seal with the minimum inner diameter side of the second fixing ring 12, thereby greatly improving the sealing effect between the sealing member 5 and the pump body 2.

[0044] This solution can significantly improve the sealing performance of the liquid metal pump through the axial and radial design of the sealing component, thereby effectively increasing the overall efficiency of the pump body. At the same time, the sealing structure greatly improves the efficiency of disassembly and assembly during maintenance, providing great convenience for the maintenance and maintenance of the liquid metal pump. This can not only bring significant economic benefits, but also reduce equipment maintenance costs and improve production efficiency.

Claims

1. A sealing structure for a molten pool liquid metal pump, characterized in that: It includes a molten pool and a pump body, the molten pool is provided with a nozzle, the outlet of the pump body cooperates with the nozzle through a sealing assembly; the sealing assembly includes a pressure plate and a sealing member, the sealing member is arranged between the nozzle and the outer wall of the pump body outlet and is pressed into the nozzle by the pressure plate.

2. The sealing structure of a molten pool liquid metal pump according to claim 1 is characterized in that: The pressure plate and the sealing member are annular structures, and the pressure plate and the sealing member are sleeved on the outside of the pump body. The pressure plate and the pump body are clearance-matched, and the inner wall of the sealing member is transitionally matched with the pump body.

3. The sealing structure of a molten pool liquid metal pump according to claim 2 is characterized in that: The nozzle is provided with a first step and a second step, the pressure plate is fixed on the first step, and the sealing member is provided on the second step.

4. The sealing structure of a molten pool liquid metal pump according to claim 3 is characterized in that: A sealing lip is provided on a side of the sealing member close to the second step, and an inner diameter of the sealing lip is smaller than an outer diameter of the pump body outlet.

5. A sealing structure for a molten pool liquid metal pump according to any one of claims 1 to 4, characterized in that: The sealing member is provided with a guide portion on one side close to the pressure plate, and the sealing member is provided with continuously distributed sealing rings on one side close to the pump body.

6. A sealing structure for a molten pool liquid metal pump according to any one of claims 1 to 4, characterized in that: There is a clearance fit between the outside of the sealing member and the nozzle, and there is a clearance fit between the sealing member and the pressure plate.

7. A sealing structure for a molten pool liquid metal pump according to claim 3 or 4, characterized in that: It also includes a first fixing ring, which is arranged between the pressure plate and the sealing member, the guide portion is arranged on the side with the smallest inner diameter of the first fixing ring, and the side of the guide portion close to the pressure plate is flush with the side of the first fixing ring close to the pressure plate.

8. The sealing structure of a molten pool liquid metal pump according to claim 7, characterized in that: It also includes a second fixing ring, which is arranged between the sealing member and the second step, and a through hole is formed between the first fixing ring and the second fixing ring and close to one side of the inner wall of the nozzle.

9. The sealing structure of a molten pool liquid metal pump according to claim 8, characterized in that: The minimum radial dimension of the second fixing ring is greater than the minimum radial dimension of the sealing lip.

10. A sealing structure for a molten pool liquid metal pump according to any one of claims 1 to 4, characterized in that: The pressure plate is provided with a guiding inclined surface on one side close to the outer wall of the pump body.

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