A tangential-impact coupling mode micro-motion abrasion simulation device

Abstract

This invention proposes a tangential-impact coupled fretting abrasion simulation device, belonging to the technical field of fretting abrasion simulation devices. It includes an interconnected molten tank and an experimental tank, each containing a molten cavity and an experimental cavity, respectively. The experimental tank is located above the molten tank and is connected to the molten cavity and the experimental cavity via a delivery pipeline and a connecting pipeline, with the connecting pipeline equipped with a valve for on / off control. The experimental tank contains a sample clamping assembly, and the molten cavity is filled with an experimental working fluid. When high-pressure gas is introduced into the molten tank, the experimental working fluid can be introduced into the experimental tank via the delivery pipeline. This device can conduct impact-tangential coupled fretting abrasion experiments, simulating impact-tangential coupled fretting wear under corrosion conditions of liquid lead-bismuth alloys, obtaining reliable impact-tangential coupled fretting abrasion results, and effectively predicting material loss caused by impact-tangential coupled fretting abrasion in lead-bismuth cooled fast reactors.

Description

Technical Field

[0001] This invention relates to the field of micro-motion abrasion simulation device technology, and more specifically, to a micro-motion abrasion simulation device with tangential-impact coupling mode. Background Technology

[0002] Nuclear energy utilization is a major strategic direction for global energy and power transition, and an important strategic measure to address global energy shortages and reduce environmental pollution. Developing nuclear energy plays a vital role in safeguarding national security, optimizing the energy structure, promoting green and low-carbon transformation, and contributing to the "dual carbon" goals. Nuclear energy is considered an important resource for future carbon neutrality.

[0003] To align with the development goals of economic efficiency, safety, and sustainability in nuclear energy systems, the Generation IV International Forum selected six reactor types with the greatest development potential, including lead-cooled reactors, to form the Generation IV reactor system. Lead-cooled fast reactors (LFRs) are fast neutron reactors cooled by lead or low-melting-point lead-bismuth eutectic (LBE) alloys. Considering the excellent thermophysical properties and relatively mature technology of lead-bismuth eutectic alloys, the CLEAR-I lead-based research reactor, the first phase of the Chinese Academy of Sciences' ADS project, selected lead-bismuth eutectic alloys as the coolant, and conducted a series of studies on neutronics, thermal hydraulics, and safety.

[0004] Unlike traditional pressurized water reactors where fuel rods are positioned using a grid, the CLEAR-I core assembly reference design uses hexagonal assemblies commonly found in fast reactors. The rod bundle structure is arranged in a triangular pattern and spirally wound with metal wire around the fuel rods. This wire-wound structure generates strong lateral flow, which is beneficial for coolant mixing between the sub-channels, resulting in more uniform fluid flow within the channels. This effectively enhances flow heat transfer capacity and reduces the peak cladding temperature.

[0005] During actual reactor operation, the coolant continuously washes over the fuel assemblies, causing the fuel rods to vibrate slightly, a phenomenon known as flow-induced vibration. This slight vibration leads to minor friction and impact interactions between structural components, causing material damage—a phenomenon known as fretting wear. Fretting wear often accompanies flow-induced vibration and has resulted in numerous accidents, such as the Douglas Point, Canada accident, the Trino, Italy steam generator tube rupture accident, the Monju experimental reactor sodium vapor leak accident in Japan, and the 2021 Taishan nuclear power plant fuel rod rupture accident.

[0006] In summary, it is necessary to conduct research on the fretting erosion characteristics of wire-wound positioning fuel rods and components in a lead-bismuth environment; therefore, how to design a fretting erosion simulation device with tangential-impact coupling mode is an urgent problem we need to solve. Summary of the Invention

[0007] The purpose of this invention is to provide a tangential-impact coupling mode fretting erosion simulation device, which can carry out impact-tangential coupling fretting erosion experimental research, simulate impact-tangential coupling fretting wear under the corrosion of liquid lead-bismuth alloy, obtain reliable impact-tangential coupling fretting erosion results, and effectively predict the material loss caused by impact-tangential coupling fretting erosion in lead-bismuth cooled fast reactors.

[0008] The embodiments of the present invention are implemented as follows:

[0009] This application provides a tangential-impact coupling mode micro-motion abrasion simulation device, which includes a molten tank and an experimental tank connected to each other, with a molten cavity and an experimental cavity formed inside the molten tank respectively; the experimental tank is located above the molten tank and is connected to the molten cavity and the experimental cavity through a delivery pipeline and a connecting pipeline respectively, and the connecting pipeline is equipped with a valve for controlling the on and off of the control; the experimental tank is equipped with a sample clamping assembly, and the molten cavity is also filled with an experimental working medium. When high-pressure gas is introduced into the molten tank, the experimental working medium can be introduced into the experimental tank through the delivery pipeline.

[0010] In some embodiments of the present invention, the above-described sample clamping assembly includes connecting and mounting portions symmetrically arranged on both sides of the experimental tank and extending into the melting chamber; the connecting and mounting portions include a connecting portion and a fixing flange, and the connecting portion and the fixing flange are fixed together by bolts;

[0011] Each of the connecting parts is provided with a movable cavity, and the movable cavities are all arranged along the axial direction of the connecting part, and movable clamping assemblies are movably connected to each movable cavity.

[0012] In some embodiments of the present invention, the above-described movable clamping assembly includes a movable disk, a connector, and a comparison sample clamp connected in sequence. The movable disk is located in the movable cavity and slides within it. One end of the connector extending out of the movable cavity is located in the experimental cavity and is fixedly connected to the comparison sample clamp. The two comparison sample clamps are arranged opposite each other and form a clamping cavity between them.

[0013] The two movable discs are respectively connected to a comparison sample fixing rod and a normal load actuator; the top of the experimental tank is also provided with a tangential micro-motion actuator and a micro-motion characteristic measuring device, and is detachably connected to the experimental tank through a connecting flange. The other end of the connecting flange is provided with a connector that extends into the experimental cavity, and the end of the connector is provided with a tangential micro-motion sample that can act on the clamping cavity.

[0014] In some embodiments of the present invention, the outer wall of the connector described above is provided with a multi-stage sealing kit for achieving a seal with the connecting mounting part, and is arranged along the length direction of the connector.

[0015] In some embodiments of the present invention, the top of both the melting tank and the experimental tank described above is provided with an exhaust pipe communicating with their interior.

[0016] In some embodiments of the present invention, both the melting tank and the experimental tank described above are provided with a plurality of heating rods for heating their interiors.

[0017] In some embodiments of the present invention, the experimental tank described above is further provided with a pressure-inducing pipe communicating with its interior, and is also provided with a control valve.

[0018] In some embodiments of the present invention, the aforementioned heating rods are respectively located on the side walls and bottom of the melting tank and the experimental tank, and are uniformly distributed along the side walls of the melting tank and the bottom of the experimental tank.

[0019] In some embodiments of the present invention, the experimental working medium described above is a lead-bismuth alloy melt.

[0020] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0021] This research device enables the conduct of impact-tangential coupled fretting corrosion experiments, simulating impact-tangential coupled fretting wear under the corrosion conditions of liquid lead-bismuth alloys, obtaining reliable impact-tangential coupled fretting corrosion results, effectively predicting material loss caused by impact-tangential coupled fretting corrosion in lead-bismuth cooled fast reactors, and establishing an impact-tangential coupled fretting corrosion prediction model. In order to realize specific fretting corrosion experiments in lead-bismuth environment, the corrosion volume and corrosion depth can be obtained, and the corrosion coefficient can be obtained based on these experimental results.

[0022] Fretting wear exists in lead-bismuth fast reactors, which can cause excessive damage to reactor components and affect reactor lifespan. This device simulates specific fretting erosion in a lead-bismuth environment to obtain the erosion coefficient, thereby predicting and improving reactor lifespan. It also clarifies the fretting erosion mechanism, elucidates the coupling relationship between fretting erosion and flow-induced vibration, identifies key influencing factors, and constructs a fretting erosion prediction model, thus providing a reference for fuel assembly safety analysis and design.

[0023] In actual use, the sample is clamped by the clamping assembly, the experimental working medium is placed into the melting tank, and the experimental working medium is heated to a fixed temperature liquid state. Then it is transported to the experimental chamber through the delivery pipeline, and there are also heating rods in the experimental chamber for heat preservation.

[0024] After the experimental environment inside the experimental chamber stabilizes, the micro-motion actuator (tangential or normal) is activated to drive the experimental piece to perform tangential or normal micro-motion, thereby realizing the friction behavior of the experimental sample in different ways. After completing a certain friction condition, the wear result caused by friction is measured to achieve the experimental purpose. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram showing the connection between the melting tank and the experimental tank in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection between the two connecting mounting parts in an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the connection between the two connecting and mounting parts in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the heating rod in an embodiment of the present invention.

[0030] Icons: 1. Melting vessel; 2. Experimental vessel; 3. Delivery pipeline; 4. Connecting pipeline; 5. Connection part; 6. Fixed flange; 7. Movable cavity; 8. Movable disc; 9. Connecting component; 10. Comparison sample fixture; 11. Clamping cavity; 12. Comparison sample fixing rod; 13. Normal load actuator; 14. Multi-stage sealing kit; 15. Exhaust pipeline; 16. Heating rod; 17. Pressure tapping pipe; 18. Tangential micro-motion actuator; 19. Micro-motion characteristic measuring device; 20. Tangential micro-motion sample. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, "multiple" means at least two.

[0037] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances. Example

[0038] Please refer to Figures 1-4 , Figure 1 The diagram shown is a schematic diagram of the connection between the melting tank 1 and the experimental tank 2 in an embodiment of the present invention;

[0039] Figure 2 The diagram shown is a connection schematic of the two connecting mounting parts in an embodiment of the present invention;

[0040] Figure 3The figure shown is a cross-sectional view of the connection between the two connecting mounting parts in an embodiment of the present invention;

[0041] Figure 4 The diagram shown is a structural schematic of the heating rod 16 in an embodiment of the present invention.

[0042] This application provides a tangential-impact coupling mode micro-motion abrasion simulation device, which includes a molten tank 1 and an experimental tank 2 connected to each other, with a molten cavity and an experimental cavity formed inside the molten tank 1, respectively. The experimental tank 2 is located above the molten tank 1 and is connected to the molten cavity and the experimental cavity through a delivery pipe 3 and a connecting pipe 4, respectively. The connecting pipe 4 is equipped with a valve for controlling the on and off of the device. The experimental tank 2 is equipped with a sample clamping assembly. The molten cavity is also filled with an experimental working medium. When high-pressure gas is introduced into the molten tank 1, the experimental working medium can be introduced into the experimental tank 2 through the delivery pipe 3.

[0043] The tangential-impact coupled fretting erosion simulation device in this application is mainly used to simulate the impact-tangential coupled fretting erosion phenomenon caused by flow-induced vibration in a lead-bismuth cooled fast reactor. This research device enables experimental studies on impact-tangential coupled fretting erosion, simulating impact-tangential coupled fretting wear under corrosion of liquid lead-bismuth alloys, obtaining reliable impact-tangential coupled fretting erosion results, effectively predicting material loss caused by impact-tangential coupled fretting erosion in lead-bismuth cooled fast reactors, and establishing an impact-tangential coupled fretting erosion prediction model. To achieve specific fretting erosion experiments in a lead-bismuth environment and obtain the erosion volume and depth, the erosion coefficient can be obtained based on these experimental results.

[0044] Fretting wear exists in lead-bismuth fast reactors, which can cause excessive damage to reactor components and affect reactor lifespan. This device simulates specific fretting erosion in a lead-bismuth environment to obtain the erosion coefficient, thereby predicting and improving reactor lifespan. It also clarifies the fretting erosion mechanism, elucidates the coupling relationship between fretting erosion and flow-induced vibration, identifies key influencing factors, and constructs a fretting erosion prediction model, thus providing a reference for fuel assembly safety analysis and design.

[0045] In actual use, the sample is clamped by the clamping assembly, the experimental working medium is placed into the melting tank, and the experimental working medium is heated to a fixed temperature liquid state. Then it is transported to the experimental chamber through the delivery pipeline 3. There is also a heating rod 16 in the experimental chamber for heat preservation.

[0046] After the experimental environment inside the experimental chamber stabilizes, the micro-motion actuator (tangential or normal) is activated to drive the experimental piece to perform tangential or normal micro-motion, thereby realizing the friction behavior of the experimental sample in different ways. After completing a certain friction condition, the wear result caused by friction is measured to achieve the experimental purpose.

[0047] In this embodiment, the experimental working medium located in the melting chamber is achieved by introducing high-pressure gas into the melting chamber. In this embodiment, the experimental working medium is transported by using high-pressure argon gas to press the experimental working medium in the melting chamber into the upper experimental chamber.

[0048] After the experiment is completed, the experimental working fluid will flow back into the melting chamber by gravity through the connecting pipe 4 by opening the valve connected to the connecting pipe 4.

[0049] It should be noted that, since the experimental working medium used in this embodiment is a lead-bismuth alloy melt, and its temperature angle is such that all components in this embodiment are made of 316L stainless steel.

[0050] In this embodiment, the above-mentioned sample fixture assembly includes connecting and mounting parts symmetrically arranged on both sides of the experimental tank 2 and extending into the melting chamber; the connecting and mounting parts include connecting parts 5 and fixing flanges 6, and the connecting parts 5 and fixing flanges 6 are fixed together by bolts;

[0051] Each connecting part 5 is provided with a movable cavity 7, and the movable cavities 7 are all arranged along the axial direction of the connecting part 5, and each movable cavity 7 is movably connected with a movable clamp assembly.

[0052] In this embodiment, the above-mentioned movable clamping assembly includes a movable disk 8, a connector 9, and a comparison sample clamping fixture 10 connected in sequence. The movable disk 8 is located in the movable cavity 7 and slides inside it. One end of the connector 9 extends out of the movable cavity 7 and is located in the experimental cavity and is fixedly connected to the comparison sample clamping fixture 10. The two comparison sample clamping fixtures 10 are arranged opposite each other and form a clamping cavity 11 between them.

[0053] Two movable discs 8 are respectively connected to a comparison sample fixing rod 12 and a normal load actuator 13; the top of the experimental tank 2 is also provided with a tangential micro-motion actuator 18 and a micro-motion characteristic measuring device 19, and is detachably connected to the experimental tank 2 through a connecting flange. The other end of the connecting flange is provided with a connector 9 that extends into the experimental chamber, and the end of the connector 9 is provided with a tangential micro-motion sample 20 that can act on the clamping cavity 11.

[0054] By outputting a normal impact motion with a fixed frequency and load (normal force) through the normal load actuator 13, the experimental sample clamped in the clamping cavity 11 is subjected to normal impact micro-motion between the experimental sample (protrusion) and the control sample (protrusion) under a certain load and frequency, thereby obtaining the micro-motion abrasion test results under a certain normal load; similarly, by outputting a tangential impact motion with a fixed frequency and load (tangential force) through the tangential micro-motion actuator 18, the experimental sample clamped in the clamping cavity 11 is subjected to tangential impact micro-motion between the experimental sample (protrusion) and the control sample (protrusion) under a certain load and frequency, thereby obtaining the micro-motion abrasion test results under a certain tangential load and normal load.

[0055] In this embodiment, the outer wall of the connector 9 is provided with a multi-stage sealing kit 14 for sealing with the connecting mounting part, and is arranged along the length direction of the connector 9.

[0056] The structure of the multi-stage sealing kit 14 is as follows Figure 2 As shown, the structure is similar to a bellows, with several ring-shaped structures formed on the outer wall to ensure that the high-temperature lead-bismuth solution will not leak from the gap between the connector 9 and the connecting mounting part during the test.

[0057] In this embodiment, both the melting tank 1 and the experimental tank 2 are provided with an exhaust pipe 15 communicating with their interiors at their top ends.

[0058] Its function is to connect an external pressure sensor to detect and measure the internal pressure of the experimental chamber. Of course, as a preferred embodiment, sensors for detecting temperature or pressure are installed in both the experimental chamber and the melting chamber.

[0059] The exhaust pipe 15 is designed to discharge the waste gas from the melting tank 1 and the experimental tank 2. In a preferred embodiment, the exhaust pipe 15 should be equipped with a valve to ensure that a sealed environment is formed inside the melting tank 1 and the experimental tank 2.

[0060] In this embodiment, both the melting tank 1 and the experimental tank 2 are equipped with a plurality of heating rods 16 for heating their interiors.

[0061] The heating rods 16 connected to the melting tank 1 are used to heat the experimental working medium; while the heating rods 16 connected to the experimental tank 2 are used to maintain the temperature of the experimental working medium in the experimental chamber.

[0062] In this embodiment, both the melting tank 1 and the experimental tank 2 are equipped with a plurality of heating rods 16 for heating their interiors.

[0063] In this embodiment, the aforementioned heating rods 16 are located on the side walls and bottom of the melting tank 1 and the experimental tank 2, respectively, and are evenly distributed along the side walls of the melting tank 1 and the bottom of the experimental tank 2.

[0064] In this embodiment, the experimental working medium is a lead-bismuth alloy melt.

[0065] The experimental working medium was a lead-bismuth alloy melt with a temperature of 300-600 degrees Celsius. Its main function was to provide a high-temperature environment for the lead-bismuth melt.

[0066] The working principle of a normal load fretting corrosion research device is as follows: it is used to simulate the impact-tangential coupled fretting corrosion phenomenon induced by flow-induced vibration in a lead-bismuth cooled fast reactor. Through this research device, impact-tangential coupled fretting corrosion experiments can be carried out to simulate impact-tangential coupled fretting wear under the corrosion conditions of liquid lead-bismuth alloy, obtain reliable impact-tangential coupled fretting corrosion results, effectively predict the material loss caused by impact-tangential coupled fretting corrosion in lead-bismuth cooled fast reactors, and establish an impact-tangential coupled fretting corrosion prediction model. To achieve specific fretting corrosion experiments in a lead-bismuth environment, the corrosion volume and corrosion depth can be obtained, and the corrosion coefficient can be obtained based on these experimental results.

[0067] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tangential-impingement coupled mode fretting corrosion simulation apparatus, characterized by, The utility model provides a kind of experimental device for high pressure gas lubricated bearing, including mutually connected melting tank and experimental tank, melt cavity and experimental cavity are formed in respectively;The experimental tank is located above the melting tank, and melt cavity and experimental cavity are communicated by conveying pipeline and connecting pipeline respectively, and the connecting pipeline is provided with valve that controller is on-off;Experimental tank is equipped with sample fixture assembly, experimental working medium is filled in melt cavity, and when high pressure gas is introduced into melting tank, experimental working medium can be guided into experimental tank from conveying pipeline; The sample fixture assembly includes connecting mounting parts symmetrically arranged on both sides of the experimental tank and extending into the melt cavity;The connecting mounting part includes a connecting part and a fixing flange, and the connecting part and the fixing flange are fixed by bolts; Each connecting part is provided with a movable cavity, and the movable cavity is arranged along the axis direction of the connecting part, and the movable cavity is movably connected with a movable clamp assembly; The movable clamp assembly includes a movable disc, a connecting piece and a comparative sample fixture connected in sequence, the movable disc is located in the movable cavity and is in sliding fit with the inside, one end of the connecting piece extending out of the movable cavity is located in the experimental cavity and is fixedly connected with the comparative sample fixture, and the two comparative sample fixtures are oppositely arranged and form a clamping cavity therebetween; The two movable discs are respectively connected with a comparative sample fixing rod and a normal load actuator; 2. A tangential-impingement coupled mode fretting corrosion simulator according to claim 1, wherein, The top end of the experimental tank is also provided with a tangential micro-motion actuator and a micro-motion characteristic measuring device, and is detachably connected with the experimental tank through a connecting flange, the other end of the connecting flange is provided with a connecting piece extending into the experimental cavity, and the end of the connecting piece is provided with a tangential micro-motion sample capable of acting on the clamping cavity.

3. A tangential-impingement coupled mode fretting corrosion simulator according to claim 1, wherein, The outer wall of the connecting piece is provided with a multistage sealing sleeve for sealing between the connecting mounting parts, and is arranged along the length direction of the connecting piece.

4. The tangential-impingement coupled mode fretting corrosion simulator of claim 1, wherein, The top end of the melting tank and the experimental tank is provided with an exhaust pipeline communicated with the inside.

5. The tangential-impingement coupled mode fretting corrosion simulator of claim 1, wherein, The melting tank and the experimental tank are provided with a plurality of heating rods for heating the inside.

6. A tangential-impingement coupled mode fretting corrosion simulator according to claim 5, wherein, The experimental tank is also provided with a pressure lead pipe communicated with the inside and provided with a control valve.

7. The tangential-impingement coupled mode fretting corrosion simulator of claim 1, wherein, The plurality of heating rods are respectively located on the side wall and the bottom end of the melting tank and the experimental tank, and are evenly distributed along the side wall of the melting tank and the bottom end of the experimental tank. The experimental working medium is lead-bismuth alloy melt.

Images