A high-throughput testing device and method for in-situ high-temperature circumferential creep of thin-walled tubes

Abstract

The present invention discloses a high-throughput testing device and method for in-situ high-temperature circumferential creep of thin-walled tubes, which relates to the technical field of thin-walled tube physical property detection, including: an autoclave, in which the thin-walled tube to be tested is arranged, and the autoclave is connected to a pressure control mechanism; both ends of the thin-walled tube to be tested are sealed and pass through the autoclave and extend to the outside, and both ends of the thin-walled tube to be tested are connected to the pressure control mechanism, which is used to control the internal pressure of the thin-walled tube to be tested. The external pressure and internal pressure of the thin-walled tube to be tested can be flexibly adjusted by the pressure regulating mechanism, and a variety of pressure and temperature environments can be simulated in combination with the temperature regulating mechanism. By providing observation channels and laser rangefinders on both sides of the thin-walled tube to be tested, the position change on the left and right sides of the thin-walled tube to be tested can be measured in situ, and then the outer diameter change and creep rate of the thin-walled tube to be tested can be calculated. The measurement process does not require shutting down the test equipment, so the test conditions are kept stable and the measurement data are true, thereby improving the test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-walled tube physical property detection technology, and in particular to a high-throughput testing device and method for in-situ high-temperature circumferential creep of thin-walled tubes. Background Art

[0002] Thin-walled tubes can creep and fail under high-temperature, circumferential stress conditions. For example, the fuel cladding tubes in nuclear reactors are subject to various pressures and temperatures, including high-temperature, high-pressure water and swelling fuel pellets, throughout their service life. This creates a safety hazard by causing creep, posing a significant risk. Therefore, it is necessary to study the circumferential creep behavior of thin-walled tubes in high-temperature, high-pressure environments to assess the safety of the equipment.

[0003] Existing technologies typically test the axial tensile creep of thin-walled tubes. This lacks the flexibility to adjust the internal and external pressures of thin-walled tubes, and it also lacks the ability to test circumferential creep. Furthermore, existing technologies lack in-situ testing methods, and creep measurement typically requires shutting down the test equipment, resulting in low experimental efficiency.

[0004] In view of this, how to provide a device for detecting the circumferential creep behavior of thin-walled tubes is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-throughput testing device and method for in-situ high-temperature circumferential creep of thin-walled tubes, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides a high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes, comprising:

[0007] An autoclave, wherein the thin-walled tube to be tested is disposed within the autoclave, the autoclave being connected to a pressure control mechanism for controlling the external pressure of the thin-walled tube to be tested; both ends of the thin-walled tube to be tested are sealed and extend through the autoclave to the outside, and both ends of the thin-walled tube to be tested are connected to the pressure control mechanism for controlling the internal pressure of the thin-walled tube to be tested;

[0008] The temperature control mechanism is used to control the temperature of the autoclave.

[0009] Furthermore, the pressure control mechanism includes:

[0010] a gas booster pump, connected to the inert gas cylinder, for pressurizing the inert gas;

[0011] a first gas supply pipe, one end of which is connected to the gas booster pump, and the other end of which is connected to the gas inlet of the autoclave;

[0012] a second gas supply pipe, one end of which is connected to the gas booster pump, and the other end of which is connected to the gas inlet end of the thin-walled tube to be tested; a first regulating valve and a second regulating valve are respectively provided on the first gas supply pipe and the second gas supply pipe, and the first regulating valve and the second regulating valve are used to adjust the gas pressure supplied by the gas booster pump to the autoclave and the thin-walled tube to be tested, thereby adjusting the external pressure and the internal pressure of the thin-walled tube to be tested;

[0013] a first exhaust pipe, connected to a gas outlet end of the autoclave;

[0014] The second exhaust pipe is connected to the air outlet end of the thin-walled tube to be tested; the first exhaust pipe and the second exhaust pipe are respectively provided with a first ball valve and a second ball valve.

[0015] Furthermore, it also includes:

[0016] An air supply main pipe, one end of which is connected to the gas booster pump, and the other end of which is connected to the first air supply pipe and the second air supply pipe respectively, and a main valve is provided on the air supply main pipe.

[0017] The gas supply main pipe can be connected to multiple groups of the first gas supply pipes and the second gas supply pipes, and circumferential creep tests of multiple groups of the thin-walled tubes to be tested can be carried out simultaneously.

[0018] Furthermore, it also includes:

[0019] a first pressure gauge, disposed on the first gas supply pipe and close to the gas inlet end of the autoclave, the first pressure gauge being used to detect and display the external pressure of the thin-walled tube to be tested;

[0020] The second pressure gauge is arranged on the second air supply pipe and close to the air inlet end of the thin-walled tube to be tested. The second pressure gauge is used to detect and display the internal pressure of the thin-walled tube to be tested.

[0021] Furthermore, the temperature control mechanism includes:

[0022] A heating jacket, which has an electric heating wire inside. The heating jacket is placed on the outer surface of the autoclave, and the temperature of the autoclave is controlled by adjusting the power of the electric heating wire;

[0023] an asbestos layer, disposed on the outer surface of the heating jacket;

[0024] Thermocouple is placed in the autoclave to detect the temperature of the autoclave.

[0025] Furthermore, it also includes:

[0026] Sealing sleeves, through which both ends of the thin-walled tube to be tested are connected to the autoclave;

[0027] A water cooling jacket is provided on the outer surface of the sealing jacket.

[0028] Furthermore, it also includes:

[0029] An observation channel, one end of which passes through the autoclave and corresponds to the thin-walled tube to be tested, and the other end of which extends away from the thin-walled tube to be tested. There are two observation channels symmetrically arranged on the left and right sides of the thin-walled tube to be tested;

[0030] A laser rangefinder is provided at the other end of the observation channel, and is used to measure the position change of the left and right sides of the thin-walled tube to be measured, and then calculate the outer diameter change and creep rate of the thin-walled tube to be measured.

[0031] The present invention also provides a high-throughput testing method for in-situ high-temperature circumferential creep of thin-walled tubes, comprising:

[0032] S1: Inert gas is sent into the autoclave and the thin-walled tube to be tested in the autoclave through a gas booster pump, and the air in the autoclave and the thin-walled tube to be tested is exhausted;

[0033] S2: adjusting the temperature of the autoclave by means of a heating jacket on the outer surface of the autoclave until the autoclave reaches a preset temperature;

[0034] S3: adjusting the pressure of the inert gas fed into the autoclave and the thin-walled tube to be tested, so as to generate a pressure difference between the inside and outside of the thin-walled tube to be tested, until a preset pressure difference is reached;

[0035] S4: The position change of the left and right sides of the thin-walled tube to be measured is detected by a laser rangefinder, and then the outer diameter change and creep rate of the thin-walled tube to be measured are calculated.

[0036] The present invention discloses the following technical effects:

[0037] 1. The present invention can flexibly adjust the external pressure and internal pressure of the thin-walled tube to be tested through the pressure regulating mechanism, and can simulate a variety of pressure and temperature environments in combination with the temperature regulating mechanism.

[0038] 2. Through the pressure control mechanism, multiple groups of thin-walled tube circumferential creep tests can be carried out simultaneously to improve test efficiency.

[0039] 3. By setting up observation channels and laser rangefinders on both sides of the thin-walled tube to be tested, the position change of the left and right sides of the thin-walled tube to be tested can be measured in situ, and then the outer diameter change and creep rate of the thin-walled tube to be tested can be calculated. The measurement process does not require shutting down the test equipment, maintaining stable test conditions and authentic measurement data, thereby improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 It is a schematic diagram of the structure of the present invention;

[0042] Figure 2 is a schematic diagram of the pressure control mechanism;

[0043] Among them, 1. Autoclave; 2. Thin-walled tube to be tested; 3. Gas booster pump; 4. Air compression pump; 5. Gas supply main pipe; 6. First gas supply pipe; 7. Second gas supply pipe; 8. Main valve; 9. Main pressure gauge; 10. Electric meter head; 11. Solenoid valve; 12. First regulating valve; 13. Second regulating valve; 14. First exhaust pipe; 15. Second exhaust pipe; 16. First ball valve; 17. Second ball valve; 18. First pressure gauge; 19. Second pressure gauge; 20. Heating jacket; 21. Sealing sleeve; 22. Sealing ferrule; 23. Observation channel; 24. Laser rangefinder; 25. Water cooling jacket; 26. Inert gas cylinder. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe 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.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] An embodiment of the present invention provides a high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes, comprising: an autoclave 1, which defines a accommodating chamber internally, a thin-walled tube 2 to be tested vertically arranged in the autoclave 1, the autoclave 1 being connected to a pressure control mechanism for controlling the external pressure of the thin-walled tube 2 to be tested; the upper and lower ends of the thin-walled tube 2 to be tested are sealed and pass through the autoclave 1 and extend to the outside, the two end ends of the thin-walled tube 2 to be tested are connected to the pressure control mechanism for controlling the internal pressure of the thin-walled tube 2 to be tested; and a temperature control mechanism for controlling the temperature of the autoclave 1.

[0047] In this embodiment, the pressure control mechanism includes a gas booster pump 3 connected to an inert gas cylinder 26, specifically argon. The gas booster pump 3 is used in conjunction with an air compressor pump 4 to increase the pressure of the inert gas. A gas supply main 5 is connected to the gas booster pump 3 at one end and to a first gas supply pipe 6 and a second gas supply pipe 7 at the other end. A main valve 8 is provided on the gas supply main 5. The gas booster pump 3 and the air compressor pump 4 are controlled by a solenoid valve 11. A pressure gauge 9 is provided on the gas supply main 5, which feeds back the gas pressure within the gas supply main 5 to a meter head 10, which is electrically connected to the solenoid valve 11, thus achieving a closed-loop control system.

[0048] The gas supply main pipe 5 is branched into a first gas supply pipe 6 and a second gas supply pipe 7. One end of the first gas supply pipe 6 is connected to the gas supply main pipe 5, and the other end is connected to the gas inlet end of the autoclave 1; one end of the second gas supply pipe 7 is connected to the gas supply main pipe 5, and the other end is connected to the gas inlet end of the thin-walled tube 2 to be tested; the first gas supply pipe 6 and the second gas supply pipe 7 are respectively provided with a first regulating valve 12 and a second regulating valve 13, which are used to adjust the gas pressure sent by the gas booster pump 3 into the autoclave 1 and the thin-walled tube 2 to be tested, and adjust the external pressure and internal pressure of the thin-walled tube 2 to be tested; the first exhaust pipe 14 is connected to the gas outlet end of the autoclave 1, and the second exhaust pipe 15 is connected to the gas outlet end of the thin-walled tube 2 to be tested; the first exhaust pipe 14 and the second exhaust pipe 15 are respectively provided with a first ball valve 16 and a second ball valve 17. When the preset internal and external pressures of the thin-walled tube 2 to be tested are reached, the first regulating valve 12, the second regulating valve 13, the first ball valve 16 and the second ball valve 17 can be closed.

[0049] In this embodiment, the main air supply pipe 5 is connected to four groups of first air supply pipes 6 and second air supply pipes 7, so that circumferential creep tests of four groups of thin-walled tubes 2 to be tested can be performed simultaneously.

[0050] In this embodiment, the first pressure gauge 18 is arranged on the first gas supply pipe 6 and close to the gas inlet end of the autoclave 1. The first pressure gauge 18 is used to detect and display the external pressure of the thin-walled tube 2 to be tested; the second pressure gauge 19 is arranged on the second gas supply pipe 7 and close to the gas inlet end of the thin-walled tube 2 to be tested. The second pressure gauge 19 is used to detect and display the internal pressure of the thin-walled tube 2 to be tested.

[0051] In this embodiment, the temperature control mechanism includes a heating jacket 20, which houses an electric heating wire. The heating jacket 20 is placed over the outer surface of the autoclave 1 and controls the temperature of the autoclave 1 by adjusting the power of the electric heating wire. An asbestos layer is placed on the outer surface of the heating jacket 20 to insulate and maintain a constant temperature. A thermocouple is placed inside the autoclave 1 to monitor the temperature of the autoclave 1. The autoclave 1 is mounted on a support plate. The lower surfaces of the heating jacket 20 and the asbestos layer are flush with the bottom surface of the autoclave 1 and are mounted together on the support plate. The lower end of the thin-walled tube 2 to be tested extends downward through the support plate.

[0052] This embodiment further includes a sealing sleeve, through which both ends of the thin-walled tube 2 to be tested are connected to the autoclave 1. The sealing sleeve specifically includes a sealing sleeve 21 and a sealing ferrule 22. The sealing sleeve 21 is mounted on the outer surface of the thin-walled tube 2 to be tested outside the autoclave 1, while the sealing ferrule 22 is mounted at the end of the thin-walled tube 2 to be tested. The sealing ferrule 22 is sealedly connected to the sealing sleeve 21, and the sealing sleeve 21 is sealedly connected to the autoclave 1. A water-cooling jacket 25 is disposed on the outer surface of the sealing sleeve to prevent heat loss to the sealing sleeve 21 and the sealing ferrule 22 caused by the heated argon gas.

[0053] In this embodiment, the observation channel 23 is arranged horizontally, one end of which is sealed and passes through the asbestos layer, the heating jacket 20 and the autoclave 1 and corresponds to the thin-walled tube 2 to be measured, and the other end extends in a direction away from the thin-walled tube 2 to be measured. There are two observation channels 23 and they are symmetrically arranged on the left and right sides of the thin-walled tube 2 to be measured; a laser rangefinder 24 is arranged at the other end of the observation channel 23, and the laser rangefinder 24 is used to measure the position change of the left and right sides of the thin-walled tube 2 to be measured, and then calculate the outer diameter change and creep rate of the thin-walled tube 2 to be measured.

[0054] The embodiment of the present invention further provides a high-throughput testing method for in-situ high-temperature circumferential creep of thin-walled tubes, comprising:

[0055] S1: Argon is fed into the autoclave 1 and the thin-walled tube 2 to be tested in the autoclave 1 by the gas booster pump 3 and the air compression pump 4, respectively, and the air in the autoclave 1 and the thin-walled tube 2 to be tested is exhausted;

[0056] S2: The temperature of the autoclave 1 is adjusted by the heating jacket 20 on the outer surface of the autoclave 1 until the autoclave 1 reaches a preset temperature. Step S3 can be performed simultaneously with step S2 or after adjusting the internal and external pressure difference.

[0057] S3: The pressure of the inert gas fed into the autoclave 1 and the thin-walled tube 2 to be tested is adjusted by the first regulating valve 12 and the second regulating valve 13 to generate a pressure difference between the inside and outside of the thin-walled tube 2 to be tested until a preset pressure difference is reached; the first regulating valve 12, the second regulating valve 13, the first ball valve 16 and the second ball valve 17 are simultaneously closed to seal the inside and outside of the thin-walled tube 2 to be tested, and maintain the preset internal and external pressures and pressure differentials;

[0058] S4: The position change of the left and right sides of the thin-walled tube 2 to be measured is detected by the laser rangefinder 24, and then the outer diameter change and the circumferential creep rate of the thin-walled tube 2 to be measured are calculated.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes, characterized in that: include: A high-pressure autoclave (1), a thin-walled tube (2) to be tested is arranged in the autoclave (1), the autoclave (1) is connected to a pressure control mechanism for controlling the external pressure of the thin-walled tube (2) to be tested; both ends of the thin-walled tube (2) to be tested are sealed and pass through the autoclave (1) and extend to the outside, and both ends of the thin-walled tube (2) to be tested are connected to the pressure control mechanism for controlling the internal pressure of the thin-walled tube (2) to be tested; A temperature control mechanism for controlling the temperature of the autoclave (1); The pressure control mechanism comprises: a gas booster pump (3), connected to the inert gas cylinder (26), for boosting the pressure of the inert gas; a first gas supply pipe (6), one end of which is connected to the gas booster pump (3) and the other end of which is connected to the gas inlet of the autoclave (1); A second air supply pipe (7) is connected at one end to the gas booster pump (3) and at the other end to the air inlet of the thin-walled tube (2) to be tested; a first regulating valve (12) and a second regulating valve (13) are respectively provided on the first air supply pipe (6) and the second air supply pipe (7); the first regulating valve (12) and the second regulating valve (13) are used to regulate the air pressure sent by the gas booster pump (3) into the autoclave (1) and the thin-walled tube (2) to be tested, thereby regulating the external pressure and the internal pressure of the thin-walled tube (2) to be tested; a first exhaust pipe (14) connected to the gas outlet end of the autoclave (1); a second exhaust pipe (15) connected to the gas outlet end of the thin-walled tube (2) to be tested; a first ball valve (16) and a second ball valve (17) are respectively provided on the first exhaust pipe (14) and the second exhaust pipe (15); Also includes: An air supply main pipe (5), one end of which is in communication with the gas booster pump (3), and the other end of which is in communication with the first air supply pipe (6) and the second air supply pipe (7), respectively; a main valve (8) is provided on the air supply main pipe (5); a first pressure gauge (18) disposed on the first gas supply pipe (6) and close to the gas inlet end of the autoclave (1), the first pressure gauge (18) being used to detect and display the external pressure of the thin-walled tube (2) to be tested; a second pressure gauge (19), arranged on the second air supply pipe (7) and close to the air inlet end of the thin-walled tube (2) to be tested, the second pressure gauge (19) being used to detect and display the internal pressure of the thin-walled tube (2) to be tested; The temperature control mechanism comprises: A heating jacket (20) having an electric heating wire disposed therein, the heating jacket (20) being sheathed on the outer surface of the autoclave (1), and the temperature of the autoclave (1) being controlled by adjusting the power of the electric heating wire; an asbestos layer, arranged on the outer surface of the heating jacket (20); a thermocouple, disposed in the autoclave (1) and used to detect the temperature of the autoclave (1); Also includes: Sealing sleeves, wherein both ends of the thin-walled tube (2) to be tested are connected to the autoclave (1) through the sealing sleeves; a water cooling jacket (25), the water cooling jacket (25) being arranged on the outer surface of the sealing jacket; An observation channel (23) has one end that penetrates the autoclave (1) and corresponds to the thin-walled tube (2) to be tested, and the other end that extends in a direction away from the thin-walled tube (2) to be tested, wherein the observation channels (23) are provided in plurality and are symmetrically arranged on the left and right sides of the thin-walled tube (2) to be tested; A laser rangefinder (24) is provided at the other end of the observation channel (23), and is used to measure the position change on the left and right sides of the thin-walled tube (2) to be measured, and further calculate the outer diameter change and creep rate of the thin-walled tube (2) to be measured.

2. A high-throughput test method for in-situ high-temperature circumferential creep of thin-walled tubes, characterized in that: The high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 1 comprises: S1: Inert gas is fed into the autoclave (1) and the thin-walled tube (2) to be tested in the autoclave (1) through a gas booster pump (3), and the air in the autoclave (1) and the thin-walled tube (2) to be tested is exhausted; S2: adjusting the temperature of the autoclave (1) by means of a heating jacket (20) on the outer surface of the autoclave (1) until the autoclave (1) reaches a preset temperature; S3: adjusting the pressure of the inert gas fed into the autoclave (1) and the thin-walled tube (2) to be tested, so as to generate a pressure difference between the inside and outside of the thin-walled tube (2) to be tested, until a preset pressure difference is reached; S4: Detecting the position change of the left and right sides of the thin-walled tube (2) to be measured by a laser rangefinder (24), and then calculating the outer diameter change and creep rate of the thin-walled tube (2) to be measured.

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