Corrosion and abrasion test device for lead-bismuth main pump impeller

Abstract

The invention belongs to the technical field of material testing and corrosion and abrasion evaluation, and particularly relates to a corrosion and abrasion testing device for a lead-bismuth main pump impeller. The device comprises a coupler, a supporting frame, a crucible, a base, a motor, a bearing, a sealing device, a sealing cavity, a shafting part, a part hanging piece and an impeller shaft frame. According to the method, the service performance of different materials under the real operation condition of the lead-bismuth main pump impeller can be simulated, and a test basis is provided for selection of the lead-bismuth main pump impeller material. The device is used for simulating the corrosion and abrasion conditions of an impeller in a nuclear reactor coolant system in a high-temperature lead-bismuth liquid environment, so that the corrosion resistance and abrasion resistance of different materials in the lead-bismuth environment are evaluated, and data support is provided for selection and improvement of materials of the impeller for a lead-bismuth pump.

Description

Technical Field

[0001] The invention belongs to the technical field of material testing and corrosion abrasion evaluation, and in particular relates to a lead-bismuth main pump impeller corrosion abrasion test device. Background Art

[0002] Lead-bismuth alloys are widely used as coolants in reactor coolant systems due to their high density, high specific heat, and good thermal conductivity. Due to the physicochemical properties of lead-bismuth alloys, they can easily cause severe corrosion and abrasion to key components in the system (such as the main pump impeller), affecting the impeller performance and the reliability and service life of the entire cooling system. Therefore, in order to realistically simulate the service state of the lead-bismuth main pump impeller in a high-temperature lead-bismuth environment, it is particularly important to study the corrosion and abrasion resistance of different materials under this operating condition and develop a reliable lead-bismuth main pump impeller corrosion and abrasion measurement device. Currently, existing corrosion and abrasion testing devices are mostly used in conventional liquid environments or for static lead-bismuth corrosion testing. There is a lack of dedicated material testing devices suitable for high-temperature, high-speed lead-bismuth environments, which cannot meet the special needs of lead-bismuth main pump impeller material testing. Therefore, it is necessary to design a material corrosion and abrasion testing device that can simulate the actual operating environment (high temperature, high speed, and inert gas-protected lead-bismuth environment) to provide an effective experimental basis for the material selection and improvement of key components such as the lead-bismuth main pump impeller. Summary of the Invention

[0003] The present invention addresses the following technical issues: providing a corrosion and abrasion testing device for lead-bismuth main pump impellers. This device can measure the service performance of different materials under simulated operating conditions, providing a test basis for material selection for lead-bismuth main pump impellers. The device is used to simulate the corrosion and abrasion of impellers in nuclear reactor coolant systems in a high-temperature lead-bismuth liquid environment, thereby evaluating the corrosion and abrasion resistance of different materials in this environment and providing data support for the selection and improvement of lead-bismuth pump impeller materials.

[0004] The technical solution adopted in the present invention is:

[0005] A lead-bismuth main pump impeller corrosion and abrasion test device, comprising a coupling, a support frame, a crucible, a base, a motor, a bearing, a sealing device, a sealing chamber, a shaft system component, a parts hanger, and an impeller shaft frame. The base is fixedly mounted on a horizontal plane by anchor bolts for fixing and supporting. A melting space is provided on the base, a through hole is opened on the upper part of the melting space, and a cover plate is provided on the base. The inner diameter of the through hole of the cover plate is smaller than the inner diameter of the through hole of the melting space, and the bottom of the through hole of the cover plate is sealed with a crucible by bolts; a support is installed on the cover plate. A frame, a motor is provided at the upper end of the support frame, a closed cavity is provided at the center of the support frame, a support plate is provided at the center of the closed cavity, a coupling is provided above the support plate, one end of the coupling is connected to the motor, and the other end is connected to the sealing device through a bearing, the sealing device is installed on the support plate and is sealed to the support plate, and a sealed cavity is formed between the support plate and the crucible; the lower end of the sealing device is connected to the shaft system component, the other end of the shaft system component is connected to the impeller shaft frame, and the part hanger is installed on the impeller shaft frame.

[0006] The crucible is used to contain liquid lead-bismuth alloy, and a heating furnace is installed at the bottom of the crucible to heat the lead-bismuth alloy to a molten state.

[0007] A melting and holding furnace is provided outside the crucible, and the melting and holding furnace is used to keep the heated lead-bismuth alloy warm.

[0008] The sealing device is used to prevent the liquid lead-bismuth medium and the inert gas from overflowing.

[0009] The impeller shaft rack and parts hanger are placed above the crucible before the test begins, and are lowered into the crucible after the lead and bismuth are melted.

[0010] The shaft system components transmit torque to the parts hangers; the parts hangers are blades made of different materials; and the impeller shaft frame is used to install different parts hangers.

[0011] A first transverse plate and a second transverse plate are provided below the support plate for fixing shaft system components.

[0012] A rib plate is provided between the second transverse plate and the shaft system component, and the rib plate is used to bear the weight of the outer sleeve that protects the shaft system component.

[0013] An air outlet pipe and an air inlet pipe are provided between the sealed cavity and the outside. The air in the sealed cavity is extracted through the air outlet pipe and the air inlet pipe and replaced with an inert gas to isolate the liquid lead-bismuth medium from contact with the air. The inert gas is nitrogen or argon, which is used to form a micro-positive pressure environment.

[0014] The crucible is provided with a sight glass, through which the working condition of the test piece in the crucible can be observed from the outside.

[0015] The sealing device is connected to an external cooling water inlet and outlet, and the cooling water inlet and outlet are inlet and outlet channels for the cooling medium of the sealing device.

[0016] During the test, a lead-bismuth alloy ingot is placed in a crucible and heated to a molten state in a heating furnace. At the same time, the air in the crucible is replaced through a sealed chamber and filled with inert gas to form a slightly positive pressure sealed environment to prevent the lead-bismuth liquid from coming into contact with air and avoid oxidation. After the lead-bismuth is completely melted, the impeller shaft frame and parts hanger are lowered into the pot body, and the blades are driven to rotate by a motor, thereby testing the corrosion and abrasion properties of the test samples in a high-temperature, high-speed lead-bismuth environment.

[0017] Beneficial effects of the present invention:

[0018] (1) The present invention provides a lead-bismuth main pump impeller corrosion and abrasion test device, which simulates the actual operating conditions of the lead-bismuth main pump impeller to test the corrosion resistance and wear resistance of different materials in a high-temperature, high-speed liquid lead-bismuth environment, and has high applicability and reliability.

[0019] (2) The present invention provides a lead-bismuth main pump impeller corrosion and abrasion test device, which not only provides a test basis for the material selection and performance improvement of the lead-bismuth pump impeller, but also provides data support for the life prediction and safety assessment of the impeller.

[0020] (3) The present invention provides a lead-bismuth main pump impeller corrosion and abrasion test device, which can effectively simulate the corrosion and abrasion process of the impeller material of the lead-bismuth pump in a high-temperature, high-speed lead-bismuth environment, and provide data support for the improvement of impeller materials and service life evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are only some of the embodiments described in the present invention. Those skilled in the art can derive other drawings based on the following drawings without inventive effort.

[0022] Figure 1 A schematic diagram of the structure of a lead-bismuth main pump impeller corrosion and abrasion test device provided by the present invention;

[0023] In the figure, 1 is a coupling, 2 is a support frame, 3 is an air outlet pipe, 4 is an air inlet pipe, 5 is a rib plate, 6 is a crucible, 7 is a melting and holding furnace, 8 is a base, 9 is a motor, 10 is a bearing, 11 is a sealing device, 12 is a cooling water inlet and outlet, 13 is a sealing chamber, 14 is a sight glass, 15 is a shaft system component, 16 is a parts hanger, and 17 is an impeller shaft frame. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., referring to orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0027] like Figure 1 As shown, the present invention provides a lead-bismuth main pump impeller corrosion and abrasion test device, which is used to test the corrosion resistance and abrasion resistance of the main pump impeller and related component materials in a high-temperature, high-speed liquid lead-bismuth environment to meet the material selection requirements for the lead-bismuth pump impeller, including a coupling 1, a support frame 2, an air outlet pipe 3, an air inlet pipe 4, a rib plate 5, a crucible 6, a melting and holding furnace 7, a base 8, a motor 9, a bearing 10, a sealing device 11, a cooling water inlet and outlet 12, a sealing chamber 13, a sight glass 14, a shaft system component 15, a parts hanger 16, and an impeller shaft frame 17.

[0028] The base 8 is fixedly mounted on a horizontal surface by anchor bolts for fixing and supporting. A melting space is provided on the base 8. The melting and holding furnace 7 is located inside the melting space. The melting and holding furnace 7 is used to keep the heated lead-bismuth alloy warm. A through hole is provided at the top of the melting space. A cover plate is provided thereon. The inner diameter of the through hole of the cover plate is smaller than the inner diameter of the through hole of the melting space. The bottom of the through hole of the cover plate is sealed with a crucible 6 by bolts. The crucible 6 is used to contain liquid lead-bismuth alloy. A heating furnace is installed at the bottom of the crucible 6 for heating the lead-bismuth alloy to a molten state. The cover A support frame 2 is mounted on the plate, a motor 9 is provided at the upper end of the support frame 2, a closed cavity is provided in the center of the support frame 2, a support plate is provided at the center of the closed cavity, a coupling 1 is provided above the support plate, one end of the coupling 1 is connected to the motor 9, and the other end is connected to a sealing device 11 through a bearing 10, the sealing device 11 is mounted on the support plate and is sealed to the support plate, the sealing device 11 is used to prevent the liquid lead-bismuth medium and the inert gas from overflowing; a first horizontal plate and a second horizontal plate are provided below the support plate, and a sealed cavity 13 is formed between the support plate and the crucible 6; The lower end of the sealing device 11 is connected to the shaft component 15, and the other end of the shaft component 15 is connected to the impeller shaft frame 17. The part hanger 16 is installed on the impeller shaft frame 17. The impeller shaft frame 17 and the part hanger 16 are placed above the crucible 6 before the test starts, and are lowered into the crucible 6 after the lead and bismuth are melted; the shaft component 15 transmits torque to the part hanger 16; the part hanger 16 is a blade of different materials; the impeller shaft frame 17 is used to install different part hangers 16; a rib plate 5 is provided between the second cross plate and the shaft component 15, and the rib plate 5 is used to receive and protect the shaft The weight of the outer sleeve of the system component; an air outlet pipe 3 and an air inlet pipe 4 are provided between the sealed cavity 13 and the outside, and a sight glass 14 is provided on the crucible 6. The air in the sealed cavity 13 is extracted through the air outlet pipe 3 and the air inlet pipe 4 and replaced with an inert gas to isolate the liquid lead-bismuth medium from contact with the air. The inert gas is nitrogen or argon, which is used to form a slightly positive pressure environment; the working condition of the test piece in the crucible 6 is observed from the outside through the sight glass 14; the sealing device 11 is connected to the external cooling water inlet and outlet 12, and the cooling water inlet and outlet 12 are the inlet and outlet channels of the cooling medium of the sealing device 11;

[0029] During the test, a lead-bismuth alloy ingot was placed in a crucible 6 and heated to a molten state in a heating furnace. Simultaneously, the air in the crucible 6 was replaced through a sealed chamber 13 and filled with an inert gas to create a slightly positive pressure sealed environment to prevent the lead-bismuth liquid from coming into contact with air and thus preventing oxidation. After the lead-bismuth was completely melted, the impeller shaft bracket 17 and the parts hanger 16 were lowered into the pot body, and the blades were driven to rotate by a motor 9, thereby testing the corrosion and abrasion properties of the test sample in a high-temperature, high-speed lead-bismuth environment.

[0030] The working principle of the present invention is:

[0031] 1) First, sufficient solid lead-bismuth alloy ingots are placed into the crucible 6;

[0032] 2) Install the impeller shaft bracket 17 carrying the test sample and several parts hangers 16 made of different materials at a high position in the sealed chamber;

[0033] 3) After closing the sealed cavity, start the exhaust valve and the air inlet valve to replace the air in the sealed cavity and fill it with inert gas (such as argon or nitrogen) to form a slightly positive pressure sealed environment.

[0034] 4) Start the heating furnace and heat the lead-bismuth alloy in the pot until it melts. During the heating process, adjust the air inlet and exhaust valves appropriately based on the concentration of the inert gas in the sealed chamber and the temperature inside the pot to ensure that the pot is always filled with inert gas.

[0035] 5) After the lead-bismuth alloy is completely melted and reaches the set temperature, the impeller shaft frame 17 and the parts hanger 16 are slowly lowered into the liquid lead-bismuth in the pot.

[0036] 6) After the position is fixed, start the motor 9 to drive the impeller to rotate in the liquid lead-bismuth. During the test, the blades of different materials can be replaced to test their corrosion resistance and wear resistance.

[0037] 7) Test Monitoring During the test, the internal conditions of the sealed chamber are observed in real time through the sight glass 14 to ensure that the test is proceeding normally. In addition, the sealed chamber 13 and the motor 9 are cooled by the cooling system so that the ambient temperature of the sealed chamber 13 and the motor 9 is within the allowable range.

[0038] 8) After the test is completed, turn off the motor 9, lift the impeller shaft frame 17 and the parts hanger 16 to above the pot body, stop heating the heating furnace, and after the lead and bismuth cool and solidify, open the sealed chamber to remove the test sample.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present invention is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A lead-bismuth main pump impeller corrosion and abrasion test device, characterized in that: The invention comprises a coupling (1), a support frame (2), a crucible (6), a base (8), a motor (9), a bearing (10), a sealing device (11), a sealing chamber (13), a shaft system component (15), a parts hanger (16), and an impeller shaft frame (17). The base (8) is fixedly mounted on a horizontal plane by anchor bolts for fixing and supporting. A melting space is provided on the base (8). A through hole is opened at the top of the melting space, and a cover plate is provided on the base (8). The inner diameter of the through hole of the cover plate is smaller than the inner diameter of the through hole of the melting space. The bottom of the through hole of the cover plate is sealed with a crucible (6) by bolts. The support frame (2) is mounted on the cover plate, and the upper end of the support frame (2) is provided with a through hole. A motor (9) is provided, a closed cavity is provided at the center of the support frame (2), a support plate is provided at the center of the closed cavity, a coupling (1) is provided above the support plate, one end of the coupling (1) is connected to the motor (9), and the other end is connected to a sealing device (11) through a bearing (10), the sealing device (11) is installed on the support plate and is sealed to the support plate, and a sealed cavity (13) is formed between the support plate and the crucible (6); the lower end of the sealing device (11) is connected to a shaft component (15), the other end of the shaft component (15) is connected to an impeller shaft frame (17), and the part hanger (16) is installed on the impeller shaft frame (17).

2. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 1 is characterized in that: The crucible (6) is used to contain liquid lead-bismuth alloy, and a heating furnace is installed at the bottom of the crucible (6) to heat the lead-bismuth alloy to a molten state.

3. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 1, characterized in that: A melting and heat-insulating furnace (7) is provided outside the crucible (6). The melting and heat-insulating furnace (7) is used to keep the heated lead-bismuth alloy warm.

4. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 1, characterized in that: The sealing device (11) is used to prevent the liquid lead-bismuth medium and the inert gas from overflowing.

5. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 2, characterized in that: The impeller shaft frame (17) and the parts hanger (16) are placed above the crucible (6) before the start of the test, and are lowered into the crucible (6) after the lead and bismuth are melted.

6. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 5, characterized in that: The shaft system component (15) is a part hanger (16) for transmitting torque; the part hanger (16) is a blade made of different materials; and the impeller shaft frame (17) is used for installing different part hangers (16).

7. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 1, characterized in that: A first transverse plate and a second transverse plate are provided below the support plate for fixing the shaft system component (15).

8. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 7, characterized in that: A rib plate (5) is provided between the second transverse plate and the shaft system component (15), and the rib plate (5) is used to bear the weight of the outer sleeve that protects the shaft system component.

9. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 6, characterized in that: An air outlet pipe (3) and an air inlet pipe (4) are provided between the sealed cavity (13) and the outside. Air in the sealed cavity (13) is extracted through the air outlet pipe (3) and the air inlet pipe (4) and replaced with an inert gas, thereby isolating the liquid lead-bismuth medium from contact with the air. The inert gas is nitrogen or argon, and is used to form a micro-positive pressure environment.

10. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 9, characterized in that: The crucible (6) is provided with a sight glass (14), and the working condition of the test piece in the crucible (6) can be observed from the outside through the sight glass (14).

11. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 10, characterized in that: The sealing device (11) is connected to an external cooling water inlet and outlet (12), and the cooling water inlet and outlet (12) are inlet and outlet channels for the cooling medium of the sealing device (11).

12. The lead-bismuth main pump impeller corrosion and abrasion testing device according to claim 11, characterized in that: During the test, a lead-bismuth alloy ingot is placed in a crucible (6) and heated to a molten state by a heating furnace. At the same time, the air in the crucible (6) is replaced by a sealed chamber (13), and an inert gas is filled in to form a slightly positive pressure sealed environment to prevent the lead-bismuth liquid from contacting the air and avoiding oxidation. After the lead-bismuth is completely melted, the impeller shaft frame (17) and the parts hanger (16) are lowered into the pot body, and the blades are driven to rotate by a motor (9), thereby testing the corrosion and abrasion properties of the test sample in a high-temperature, high-speed lead-bismuth environment.

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