Nuclear steam generator tube plugging apparatus

Abstract

The present application relates to a kind of nuclear power steam generator pipe blocking equipment, by the setting of driving device and fluid guide device, greatly simplify the operation process of pipe blocking, reduce the work intensity of operator. By the cooperation of hydraulic guide assembly and gas guide assembly, the pipe blocking work of plug to heat pipe can be quickly completed, the time required for pipe blocking is reduced, and the efficiency of pipe blocking operation is improved. Further, the nuclear power steam generator pipe blocking equipment can be applied to heat pipes of different sizes and types, and can be used in different nuclear power plant environments, with good versatility and adaptability.

Description

Technical Field

[0001] This invention relates to the field of nuclear power, and more particularly to pipe plugging equipment for nuclear power steam generators. Background Technology

[0002] The steam generator in a nuclear power plant plays a crucial role in the nuclear energy conversion process, serving as a key component connecting the reactor and the turbine generator set. Among its components, the heat transfer tubes are a core element, used to facilitate heat exchange between the primary-side coolant (typically high-pressure water) and the secondary-side feedwater, thereby generating high-temperature steam to drive the turbine and generate electricity.

[0003] During long-term operation, heat transfer tubes may break due to various factors such as corrosion and fatigue, leading to problems such as coolant leakage, and in severe cases, even affecting the safe and stable operation of the entire nuclear power plant. Therefore, timely and effective repair of damaged heat transfer tubes is crucial. Currently, the most common method for dealing with damaged heat transfer tubes is to seal them with tube plugging technology to isolate the damaged tubes and ensure the normal operation of the remaining intact heat transfer tubes. However, existing tube plugging methods—such as welding and mechanical expansion—have disadvantages such as being complex to operate and time-consuming. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pipe-plugging device for nuclear power steam generators, which can solve the technical problems of complex and time-consuming pipe-plugging operations.

[0005] This invention provides a tube-plugging device for a nuclear power steam generator, used for plugging heat transfer tubes, wherein the heat transfer tubes are disposed on a tube sheet. The nuclear power steam generator tube-plugging device includes:

[0006] A driving device, the driving device including a cylinder and a piston, the cylinder being disposed on the tube sheet, and the piston being slidably disposed within the piston;

[0007] A fluid guiding device, comprising a hydraulic guiding assembly and a gas guiding assembly, wherein the hydraulic guiding assembly and the gas guiding assembly are respectively connected to the cylinder body; and

[0008] A mandrel, one end of which is connected to the piston, and the other end of which is detachably connected to a plug.

[0009] The hydraulic guiding assembly is used to guide liquid into the cylinder to drive the piston to move away from the tube sheet, thereby driving the plug to abut against the tube sheet via the mandrel, and causing the mandrel to retract from the plug so that the plug seals the heat transfer tube; the gas guiding assembly is used to guide gas into the cylinder to drive the piston to move closer to the tube sheet, thereby inserting the mandrel into the plug.

[0010] Preferably, the plug includes a sealing cylinder and an expansion block. The sealing cylinder has an insertion hole, and the diameter of the insertion hole gradually increases along the depth direction to form a small diameter end and a large diameter end. The expansion block is disposed at the large diameter end.

[0011] The mandrel is inserted into the expansion block via the small diameter end. When the expansion block is driven by the mandrel and passes through the small diameter end, the wall of the insertion hole is deformed by the expansion block, thereby the sealing cylinder expands and abuts against the inner wall surface of the heat transfer tube.

[0012] Preferably, the cross-section of the expansion block in the height direction is trapezoidal.

[0013] Preferably, the end of the mandrel is provided with a connecting thread, which is screwed onto the expansion block.

[0014] Preferably, the hydraulic guide assembly includes a liquid guide pipe and a liquid guide hole. The liquid guide hole is disposed on the cylinder body, and the liquid guide pipe communicates with the liquid guide hole. The liquid guide pipe supplies liquid to the liquid guide hole, and the liquid guide hole supplies liquid to the cylinder body.

[0015] Preferably, the gas guiding assembly includes an air hole and an air pipe. The air hole is disposed on the cylinder body, and the air pipe is connected to the air hole. The air pipe supplies gas to be introduced into the air hole, and the air hole supplies gas to be introduced into the cylinder body.

[0016] Preferably, the cylinder body has a movable cavity, the piston is provided with at least one sealing ring, the sealing ring is sealed against the inner wall surface of the movable cavity, the piston is slidably disposed in the movable cavity, the hydraulic guide assembly and the gas guide assembly are respectively connected to the movable cavity, and the mandrel extends from the movable cavity to the outside of the cylinder body.

[0017] Preferably, the cylinder body is further provided with a clearance hole, the diameter of which is adapted to the mandrel, and the diameter of which is smaller than the inner diameter of the heat transfer tube.

[0018] Preferably, the driving device further includes a rotary driving component, which is driven and connected to the piston. The rotary driving component is used to drive the piston to rotate, thereby driving the spindle to rotate.

[0019] Preferably, the drive device further includes a rotary connector, one end of which is inserted into the cylinder and connected to the piston, and the other end of which is exposed outside the cylinder. The rotary drive is driven and connected to the rotary connector.

[0020] The implementation of this invention has the following beneficial effects:

[0021] This invention relates to a pipe-plugging device for nuclear power steam generators. By setting up a drive device and a fluid guiding device, the pipe-plugging operation process is greatly simplified and the workload of operators is reduced.

[0022] By using the hydraulic guide assembly and the gas guide assembly together, the plugging of the heat transfer tube can be completed quickly, reducing the time required for plugging and improving the efficiency of the plugging operation.

[0023] Furthermore, the tube plugging equipment for nuclear power steam generators is applicable to heat transfer tubes of different sizes and types, and can be used in different nuclear power plant environments, demonstrating good versatility and adaptability. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0025] Figure 1 This is a schematic diagram of the nuclear power steam generator tube plugging device assembled onto the tube sheet in some embodiments of the present invention;

[0026] Figure 2 yes Figure 1 The diagram shows the internal structure of the tube-blocking equipment, tube sheet, and heat transfer tubes of a nuclear power plant steam generator.

[0027] Figure 3 yes Figure 2 A schematic diagram of the structure at a local location;

[0028] Figure 4 This is a schematic diagram of the nuclear power steam generator tube plugging device assembled onto the tube sheet in other embodiments of the present invention;

[0029] Figure 5 From another perspective Figure 4 The diagram shows the structural schematic of the nuclear power steam generator tube plugging device assembled onto the tube sheet.

[0030] Figure 6 yes Figure 4 A schematic diagram of the internal structure. Detailed Implementation

[0031] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be more thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0032] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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.

[0034] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Figure 1 The illustration shows a tube-blocking device 10 for a nuclear power steam generator in some embodiments of the present invention, which is used to block heat transfer tubes 4, which are disposed on a tube sheet 5. It should be noted that the tube sheet 5 is used to fix the heat transfer tubes 4, which are used for heat exchange.

[0036] like Figures 1 to 3 As shown, the nuclear power steam generator plugging device 10 includes a drive device 1, a fluid guiding device 2, and a mandrel 3. The fluid guiding device 2 is connected to the drive device 1, and the mandrel 3 is mounted on the drive device 1.

[0037] Understandably, the drive device 1 is used to align the end of the heat transfer tube 4 and to drive the mandrel 3 to move. The fluid guiding device 2 guides the fluid to the drive device 1, thereby giving the drive device 1 kinetic energy, which in turn enables the drive device 1 to drive the mandrel 3 to move in a predetermined direction. The mandrel 3 is used to connect with the plug 6, thereby enabling the plug 6 to move inside the heat transfer tube; the mandrel 3 is also used to drive the plug 6 to expand when it is removed, and the expanded plug 6 will abut against the inner wall of the heat transfer tube 4 along the circumferential direction, thereby forming a stable and reliable seal at the abutment position between the plug 6 and the heat transfer tube 4, completing the tube plugging work.

[0038] like Figures 1 to 3 As shown, the drive device 1 includes a cylinder 11 and a piston 12. The cylinder 11 is mounted on the tube sheet 5, and the piston 12 is slidably mounted inside the piston 12. The fluid guiding device 2 includes a hydraulic guiding assembly 21 and a gas guiding assembly 22. The hydraulic guiding assembly 21 and the gas guiding assembly 22 are respectively connected to the cylinder. One end of the spindle 3 is connected to the piston 12, and the other end of the spindle 3 is detachably connected to the plug 6.

[0039] The hydraulic guide assembly 21 is used to guide liquid into the cylinder 11 to drive the piston 12 to move away from the tube sheet 5, thereby driving the plug 6 to abut against the tube sheet 5 through the spindle 3, and causing the spindle 3 to retract from the plug 6 so that the plug 6 seals the heat transfer tube 4; the gas guide assembly 22 is used to guide gas into the cylinder 11 to drive the piston 12 to move closer to the tube sheet 5, thereby inserting the spindle 3 into the plug 6.

[0040] Understandably, the cylinder body 11 is fixedly mounted on the tube sheet 5, and its interior forms a space to accommodate the piston 12. The design of the cylinder body 11 ensures that the piston 12 can slide smoothly within it. The piston 12 is slidably disposed within the cylinder body 11, forming a closed space with the cylinder body 11; the fluid guiding device 2 directs fluid to different positions within the closed space, causing the piston 12 to move in different directions. The direction of movement of the piston 12 determines the installation and removal of the plug 6.

[0041] The hydraulic guide assembly 21 is used to deliver liquid into the cylinder 11, and the piston 12 is driven to move away from the tube sheet 5 by the change in liquid pressure. During this process, the piston 12 pushes the plug 6 against the tube sheet 5 through the spindle 3, and then the spindle 3 retracts the plug 6, so that the plug 6 firmly seals the heat transfer tube 4.

[0042] The gas guiding assembly 22 is used to deliver gas into the cylinder 11, and the piston 12 is driven to move closer to the tube sheet 5 by the pressure change of the gas. At this time, the mandrel 3 is inserted and connected to the plug 6, preparing for the subsequent plugging work of the plug 6.

[0043] The spindle 3 is used to enable the installation and removal of the plug 6 under the drive of the piston 12.

[0044] It should be noted that hydraulically driven piston movement allows the incompressible liquid to stably support the piston, ensuring successful plugging. Gas-driven piston movement enables rapid movement, allowing the mandrel to quickly connect with the plug, thus improving plugging efficiency.

[0045] It should also be noted that the present invention achieves automatic installation and removal of the plug 6 by using hydraulic and gas guiding components in combination, eliminating the tedious manual installation and removal of the plug, greatly simplifying the pipe blocking operation process. At the same time, the present invention can quickly complete the installation and removal of the plug 6, effectively shortening the pipe blocking operation time and improving work efficiency.

[0046] In addition, the plug and the mandrel can be connected and fixed outside the heat transfer tube, and then the nuclear power steam generator plugging device 10 can be moved to the position aligned with the heat transfer tube by a moving mechanism or robotic arm.

[0047] like Figures 1 to 3 As shown, in some embodiments of the plugging device 10 for nuclear power steam generators, the plug 6 includes a plugging cylinder 61 and an expansion block 62. The plugging cylinder 61 has an insertion hole 63. The diameter of the insertion hole 63 gradually increases along the depth direction to form a small diameter end 631 and a large diameter end 632. The expansion block 62 is disposed at the large diameter end 632.

[0048] The mandrel 3 is inserted into the expansion block 62 via the small diameter end 631. When the expansion block 62 is driven by the mandrel 3 and passes through the small diameter end 631, the wall of the insertion hole 63 is deformed by the expansion block 62, thereby expanding the sealing cylinder 61 and pressing against the inner wall surface of the heat transfer tube 4.

[0049] Understandably, the sealing cylinder 61 is used to seal the heat transfer tube 4, and one end of it is provided with an insertion hole 63 for the insertion of the mandrel 3. The expansion block 62 is located at the large diameter end 632 of the sealing cylinder 61. After the mandrel 3 is inserted into the expansion block 62, the expansion block 62 will be fixed to the end of the mandrel 3.

[0050] The small-diameter end 631 of the insertion hole 63 is the position where the mandrel 3 is inserted into the sealing cylinder 61. The mandrel can be inserted through this small-diameter end into the insertion hole 63, so that the mandrel can be inserted into the plug located at the large-diameter end. The large-diameter end 632 of the insertion hole 63 has a larger diameter, and the expansion block 62 is set here. After the mandrel 3 is inserted into the expansion block 62, the expansion block 62 will be fixed at the end of the mandrel 3.

[0051] In actual operation, the gas guiding assembly 22 introduces gas into the cylinder 11. The piston 12 drives the mandrel 3 to be inserted into the small-diameter end 631 and further inserts the expansion block 62 connected to the large-diameter end 632. Then, the hydraulic guiding assembly 21 introduces liquid into the cylinder 11, causing the piston 12 to move in the opposite direction. As a result, the mandrel 3 drives the sealing cylinder 61 to move in the opposite direction through the expansion block 62 until the sealing cylinder 61 is held against and limited on the tube sheet 5. As the hydraulic guiding assembly 21 further introduces liquid into the cylinder 11, the mandrel 3 will continue to move the expansion block 62. At this time, since the sealing cylinder 61 is limited to the tube sheet and cannot move further, the expansion block 62 will move to the small-diameter end 631.

[0052] During the process of the expansion block 62 moving to the small diameter end 631, the expansion block 62 will press against the inner wall of the sealing cylinder 61, so that the outer contour of the sealing cylinder 61 gradually increases, and the outer periphery of the sealing cylinder 61 abuts against the inner wall of the heat transfer tube 4, thus completing the sealing of the heat transfer tube.

[0053] like Figures 1 to 3 As shown, in some embodiments of the plugging device 10 for nuclear power steam generators, the expansion block 62 has a trapezoidal cross-section in the height direction.

[0054] Understandably, the expansion block 62 has a trapezoidal cross-section in the height direction, which means that the width of the expansion block 62 is narrower at one end and wider at the other end. Furthermore, when the trapezoidal expansion block 62 moves in the direction required for plugging the pipe, the smaller end of the expansion block 62 will abut against the wall of the insertion hole 63 before the wider end. With the further movement of the expansion block 62, the deformation and expansion process of the plugging cylinder 61 will be smoother, avoiding direct damage to the expansion block due to excessive deformation in a short time.

[0055] In some embodiments of the nuclear power steam generator plugging device 10, the end of the mandrel 3 is provided with a connecting thread, which is screwed onto the expansion block 62.

[0056] Understandably, the connecting thread is screwed into the expansion block 62 to ensure a secure connection between the two. At the same time, the connecting thread can only be unlocked by relative rotation in the circumferential direction, and the mandrel 3 will not be driven to rotate during the plugging process, thus preventing the mandrel 3 from accidentally disengaging from the expansion block 62.

[0057] like Figures 1 to 3As shown, in some embodiments of the plugging device 10 for a nuclear power steam generator, the hydraulic guide assembly 21 includes a liquid guide pipe 211 and a liquid guide hole 212. The liquid guide hole 212 is disposed on the cylinder body 11. The liquid guide pipe 211 communicates with the liquid guide hole 212. The liquid guide pipe 211 supplies liquid to the liquid guide hole 212, and the liquid guide hole 212 supplies liquid to the cylinder body 11.

[0058] Understandably, the liquid guide pipe 211 is used to introduce liquid from the outside into the liquid guide hole 212, which is located on the cylinder 11, allowing the liquid to be further introduced into the cylinder 11 through the liquid guide hole 212. It should be noted that the liquid can be supplied by an external liquid pump, which pumps the liquid into the liquid guide pipe 211. This allows operators to remotely control the liquid pump, eliminating the need for manual entry into the nuclear power plant heat exchanger and improving the safety factor of pipe plugging in nuclear power plants.

[0059] like Figures 1 to 3 As shown, in some embodiments of the nuclear power steam generator plugging device 10, the gas guiding assembly 22 includes a vent 221 and a gas pipe 222. The vent 221 is disposed on the cylinder 11, and the gas pipe 222 is connected to the vent 221. The gas pipe 222 supplies gas to the vent 221, and the vent 221 supplies gas to the cylinder 11.

[0060] Understandably, the vent 221 is formed on the cylinder block 11 to introduce gas into the cylinder block 11. The vent pipe 222 is used to introduce gas from the outside into the vent 221 and finally into the cylinder block 11.

[0061] It should be noted that gas can be pumped into gas pipe 222 using an air pump, or gas pipe 222 can be directly connected to the gas source in the factory. Operators can also remotely control the gas path to ensure a safe level of pipe blockage.

[0062] like Figures 1 to 3 As shown, in some embodiments of the plugging device 10 for a nuclear power steam generator, a movable cavity 18 is provided inside the cylinder 11, and at least one sealing ring 13 is provided on the piston 12. The sealing ring 13 seals and abuts against the inner wall of the movable cavity 18. The piston 12 is slidably disposed in the movable cavity 18. The hydraulic guide assembly 21 and the gas guide assembly 22 are respectively connected to the movable cavity 18, and the mandrel 3 extends from the movable cavity 18 to the outside of the cylinder 11.

[0063] Understandably, the movable chamber 18 provides the space required for the piston 12 to slide, and also allows liquids and gases to be introduced into it, thereby enabling the piston to slide along the movable chamber 18 through the action of the liquid or gas on the piston. The sealing ring 13 is used to seal against the inner wall surface of the movable chamber 18, ensuring that hydraulic or gas leaks when the piston 12 slides in the movable chamber 18; specifically, the sealing ring ensures that gas and liquid are always confined to the corresponding side of the piston 12.

[0064] like Figures 1 to 3 As shown, in some embodiments of the nuclear power steam generator plugging device 10, a clearance hole 17 is also provided on the cylinder 11. The diameter of the clearance hole 17 is adapted to the mandrel 3, and the diameter of the clearance hole 17 is smaller than the inner diameter of the heat transfer tube 4.

[0065] Understandably, the diameter of the clearance hole 17 is adapted to the mandrel 3, ensuring that the mandrel 3 can pass smoothly through the clearance hole 17. The diameter of the clearance hole 17 is smaller than the inner diameter of the heat transfer tube 4, ensuring that the mandrel 3 can pass through the clearance hole 17 without contacting the inner wall of the heat transfer tube 4.

[0066] like Figures 1 to 3 As shown, in some embodiments of the nuclear power steam generator plugging device 10, the drive device 1 further includes a rotary drive 14, which is connected to the piston 12 and is used to drive the piston 12 to rotate, thereby driving the spindle 3 to rotate.

[0067] Understandably, the rotary drive 14 drives the piston 12 to rotate. In this way, if the end of the spindle 3 is configured with a thread, the rotating piston 12 will drive the spindle 3 to rotate, so that the thread on the spindle can be screwed into the plug 6.

[0068] Specifically, the plug and the end of the mandrel can be screwed together without the internal thread on the plug 6. Alternatively, the internal thread on the plug 6 can be screwed together with the external thread on the mandrel 3.

[0069] like Figures 1 to 3 As shown, in some embodiments of the nuclear power steam generator plugging device 10, the drive device 1 further includes a rotary connector 15, one end of which is inserted into the cylinder 11 and connected to the piston 12, and the other end of which is exposed outside the cylinder 11. The rotary drive 14 is driven and connected to the rotary connector 15.

[0070] Understandably, the rotary connector 15 serves to transmit torque, and the rotary drive 14 drives the piston 12 to rotate through the rotary connector 15.

[0071] like Figures 4 to 6As shown, in some embodiments of the plugging device for a nuclear power steam generator, the drive device 1 further includes a movable connection assembly 16, which includes a first connecting plate 161, a second connecting plate 162, a support base 163, and an elastic element 164.

[0072] The first connecting plate 161 is connected to the piston 12 and exposed outside the cylinder body 11. The first connecting plate 161 has a plurality of first mating protrusions 1611 arranged in the circumferential direction. The rotary drive member 14 is driven to the support base 163. The second connecting plate 162 is slidably disposed on the support base 163. The second connecting plate 162 has a plurality of second mating protrusions 1621 arranged in the circumferential direction. The elastic member 164 is disposed on the support base 163 and is driven to the second connecting plate 162. The elastic member 164 provides a force to drive the second connecting plate 162 to move away from the support base 163.

[0073] When the second connecting plate 162 is attached to the first connecting plate 161, each of the second mating protrusions 1621 and each of the first mating protrusions 1611 are locked together, so that the rotary drive member 14 can drive the second connecting plate 162 to rotate through the support base 163, and drive the first connecting plate 161 to rotate through the second mating protrusions 1621 supporting the first mating protrusions 1611, thereby driving the first connecting plate 161 to rotate, and then the first connecting plate 161 drives the piston 12 to rotate.

[0074] Understandably, when it is necessary to drive the spindle 3 to rotate, the existing moving mechanism or robotic arm can be used to drive the rotary drive component to move towards the cylinder 11, so that the second connecting plate 162 is correspondingly held against the first connecting plate 161. After the support seat 163 drives the second connecting plate 162 to rotate and move by an angle, the second connecting plate 162 will always have a tendency to move towards the first connecting plate 161 under the drive of the elastic element 164. Thus, the second connecting plate 162, which has rotated to the position, will automatically align and hold against the first connecting plate 161, so that each of the second mating protrusions 1621 and each of the first mating protrusions 1611 are locked together, thereby locking the first connecting plate 161 and the second connecting plate 162 in this rotation direction, so that when the second connecting plate 162 rotates in this direction, it can drive the first connecting plate 161 to rotate, thereby achieving the purpose of driving the spindle 3 to rotate.

[0075] It should be noted that the moving mechanism that drives the rotary drive component 14 to move can be a motor-driven moving mechanism or a pneumatic component-driven moving mechanism.

[0076] The second connecting plate 162 is fixed to the support base 163 in the circumferential rotation direction, meaning that the second connecting plate 162 and the support base 163 cannot rotate relative to each other. Specifically, the second connecting plate 162 and the support base 163 can be slidably connected through a groove rail, slide rail, or guide rod structure. The sliding connection mechanism will limit the second connecting plate 162 to move only towards or away from the support base 163; thus, the support base 163 can drive the second connecting plate 162 to rotate, smoothly transmitting torque.

[0077] Specifically, the elastic element 164 includes a tension spring or a disc spring.

[0078] Furthermore, the first connecting plate 161 is provided with a positioning post at the center position, and the second connecting plate 162 is provided with a positioning hole at the center position, and the positioning post can be detachably inserted into the positioning hole.

[0079] Understandably, during the alignment and engagement of the second connecting plate 162 and the first connecting plate 161, the positioning pin will be inserted into the positioning hole accordingly. This ensures that the second connecting plate 162 and the first connecting plate 161 can be precisely aligned, and that torque can be transmitted through the second connecting plate 162 and the first connecting plate 161.

[0080] The implementation of this invention has the following beneficial effects:

[0081] This invention relates to a pipe-plugging device for nuclear power steam generators. By setting up a drive device and a fluid guiding device, the pipe-plugging operation process is greatly simplified and the workload of operators is reduced.

[0082] By using the hydraulic guide assembly and the gas guide assembly together, the plugging of the heat transfer tube can be completed quickly, reducing the time required for plugging and improving the efficiency of the plugging operation.

[0083] Furthermore, the tube plugging equipment for nuclear power steam generators is applicable to heat transfer tubes of different sizes and types, and can be used in different nuclear power plant environments, demonstrating good versatility and adaptability.

[0084] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the embodiments of the present invention can be adjusted in order, combined, and deleted according to actual needs, and the modules in the device of the embodiments of the present invention can be combined, divided, and deleted according to actual needs.

[0085] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A tube-plugging device for a nuclear power steam generator, used for plugging heat transfer tubes, wherein the heat transfer tubes are disposed on a tube sheet, characterized in that, The nuclear power steam generator plugging device includes: A driving device, the driving device including a cylinder and a piston, the cylinder being disposed on the tube sheet, and the piston being slidably disposed within the piston; A fluid guiding device, comprising a hydraulic guiding assembly and a gas guiding assembly, wherein the hydraulic guiding assembly and the gas guiding assembly are respectively connected to the cylinder body; and A mandrel, one end of which is connected to the piston, and the other end of which is detachably connected to a plug. The hydraulic guiding assembly is used to guide liquid into the cylinder to drive the piston to move away from the tube sheet, thereby driving the mandrel to push the plug against the tube sheet and causing the mandrel to retract from the plug, thus sealing the heat transfer tube; the gas guiding assembly is used to guide gas into the cylinder to drive the piston to move closer to the tube sheet, thereby inserting the mandrel into the plug.

2. The nuclear power steam generator plugging device according to claim 1, characterized in that, The plug includes a sealing cylinder and an expansion block. The sealing cylinder has an insertion hole, and the diameter of the insertion hole gradually increases along the depth direction to form a small diameter end and a large diameter end. The expansion block is disposed at the large diameter end. The mandrel is inserted into the expansion block via the small diameter end. When the expansion block is driven by the mandrel and passes through the small diameter end, the wall of the insertion hole is deformed by the expansion block, thereby the sealing cylinder expands and abuts against the inner wall surface of the heat transfer tube.

3. The nuclear power steam generator pipe plugging device according to claim 2, characterized in that, The expansion block has a trapezoidal cross-section in the height direction.

4. The nuclear power steam generator plugging device according to claim 2 or 3, characterized in that, The end of the mandrel is provided with a connecting thread, which is screwed onto the expansion block.

5. The nuclear power steam generator plugging device according to claim 1, characterized in that, The hydraulic guide assembly includes a liquid guide tube and a liquid guide hole. The liquid guide hole is disposed on the cylinder body, and the liquid guide tube communicates with the liquid guide hole. The liquid guide tube supplies liquid to be introduced into the liquid guide hole, and the liquid guide hole supplies liquid to be introduced into the cylinder body.

6. The nuclear power steam generator plugging device according to claim 1, characterized in that, The gas guiding assembly includes an air hole and an air pipe. The air hole is disposed on the cylinder body, and the air pipe is connected to the air hole. The air pipe supplies gas to the air hole, and the air hole supplies gas to the cylinder body.

7. The nuclear power steam generator plugging device according to any one of claims 1, 5, and 6, characterized in that, The cylinder body has a movable cavity, and the piston is provided with at least one sealing ring. The sealing ring seals and abuts against the inner wall surface of the movable cavity. The piston is slidably disposed in the movable cavity. The hydraulic guide assembly and the gas guide assembly are respectively connected to the movable cavity. The mandrel extends from the movable cavity to the outside of the cylinder body.

8. The nuclear power steam generator pipe plugging device according to claim 7, characterized in that, The cylinder body is also provided with a clearance hole, the diameter of which is adapted to the mandrel, and the diameter of the clearance hole is smaller than the inner diameter of the heat transfer tube.

9. The nuclear power steam generator pipe plugging device according to claim 1, characterized in that, The driving device further includes a rotary drive component, which is driven to connect to the piston and is used to drive the piston to rotate, thereby driving the spindle to rotate.

10. The nuclear power steam generator plugging device according to claim 9, characterized in that, The drive device further includes a rotary connector, one end of which is inserted into the cylinder and connected to the piston, and the other end of which is exposed outside the cylinder. The rotary drive is driven and connected to the rotary connector.

Images