High-throughput test device and method for in-situ high-temperature circumferential creep of thin-walled tube

Abstract

The invention discloses a high-throughput test device and method for in-situ high-temperature circumferential creep of a thin-walled tube, and relates to the technical field of detection of physical properties of the thin-walled tube, the high-throughput test device comprises a high-pressure kettle, a to-be-tested thin-walled tube is arranged in the high-pressure kettle, and the high-pressure kettle is communicated with a pressure control mechanism; the two ends of the to-be-tested thin-walled tube penetrate through the autoclave in a sealed mode and extend out, and the two ends of the to-be-tested thin-walled tube are communicated with the pressure control mechanism and used for controlling the internal pressure of the to-be-tested thin-walled tube. The external pressure and the internal pressure of the to-be-tested thin-walled tube can be flexibly adjusted through the pressure adjusting mechanism, and various pressure and temperature environments can be simulated in combination with the temperature adjusting mechanism. By means of the observation hole channels and the laser range finders arranged on the two sides of the to-be-measured thin-walled tube, the position variable quantity of the left side and the right side of the to-be-measured thin-walled tube can be measured in situ, then the outer diameter variable quantity and the creep rate of the to-be-measured thin-walled tube are calculated, test equipment does not need to be shut down in the measurement process, test conditions are kept stable, measurement data are true, and the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thin-walled tube physical property detection, 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 will creep and fail in high temperature and circumferential stress environments. For example, the fuel cladding tubes inside nuclear reactors are affected by external high temperature and high pressure water, internal fuel pellet swelling and other factors during their entire service life. They are subject to a variety of pressures and temperatures inside and outside the tubes, resulting in creep behavior, which poses a safety hazard. Therefore, it is necessary to study the circumferential creep behavior of thin-walled tubes in high temperature and pressure environments to evaluate the safety of the equipment.

[0003] The existing technology generally tests the axial tensile creep of thin-walled tubes. On the one hand, it is impossible to flexibly adjust the internal and external pressures of thin-walled tubes, and on the other hand, it is impossible to test the circumferential creep of thin-walled tubes. In addition, the existing technology lacks in-situ testing methods. When measuring the creep amount, the test equipment generally needs to be shut down, resulting in low experimental efficiency.

[0004] In view of this, how to provide a device for detecting the circumferential creep behavior of a thin-walled tube 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 object, the present invention provides a high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes, comprising:

[0007] An autoclave, in which the thin-walled tube to be tested is arranged, and the autoclave is 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 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 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 comprises:

[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 end of the autoclave;

[0012] A second air supply pipe, one end of which is connected to the gas booster pump, and the other end of which is connected to the air inlet end of the thin-walled tube to be tested; the first air supply pipe and the second air supply pipe are respectively provided with a first regulating valve and a second regulating valve, the first regulating valve and the second regulating valve being used to adjust the air pressure sent by the gas booster pump into the autoclave and the thin-walled tube to be tested, and to adjust 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 respectively connected to the first air supply pipe and the second air supply pipe. A main valve is arranged on the air supply main pipe.

[0017] The main air supply pipe can be connected to multiple groups of the first air supply pipes and the second air supply pipes, and circumferential creep tests of multiple groups of the thin-walled pipes 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 is 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 comprises:

[0022] A heating jacket, wherein an electric heating wire is arranged inside the heating jacket, the heating jacket is arranged 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, arranged on the outer surface of the heating jacket;

[0024] Thermocouple, which is installed in the autoclave, is used 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 arranged 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 and they are symmetrically arranged on the left and right sides of the thin-walled tube to be tested;

[0030] A laser rangefinder is arranged 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 test method for in-situ high-temperature circumferential creep of a thin-walled tube, comprising:

[0032] S1: Inert gas is respectively 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 that a pressure difference is generated inside and outside 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 circumferential creep tests of thin-walled tubes can be carried out simultaneously to improve the 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. There is no need to shut down the test equipment during the measurement process, maintaining stable test conditions and true 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 drawings required for use in the embodiments will be briefly introduced below. 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 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work 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 test device for in-situ high-temperature circumferential creep of a thin-walled tube, comprising: an autoclave 1, which defines a containing cavity inside, a thin-walled tube 2 to be tested is vertically arranged in the autoclave 1, the autoclave 1 is connected to a pressure control mechanism, and is used to control 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, and the two end heads of the thin-walled tube 2 to be tested are connected to the pressure control mechanism, and are used to control the internal pressure of the thin-walled tube 2 to be tested; a temperature control mechanism, which is used to control the temperature of the autoclave 1.

[0047] In this embodiment, the pressure control mechanism includes: a gas booster pump 3, which is connected to the inert gas bottle 26, and the inert gas is specifically selected as argon; the gas booster pump 3 is used in conjunction with the air compression pump 4 to pressurize the inert gas. One end of the gas supply main pipe 5 is connected to the gas booster pump 3, and the other end is respectively connected to the first gas supply pipe 6 and the second gas supply pipe 7. The gas supply main pipe 5 is provided with a main valve 8. The gas booster pump 3 and the air compression pump 4 are controlled by the solenoid valve 11. The gas supply main pipe 5 is provided with a pressure main gauge 9, which feeds back the gas pressure in the gas supply main pipe 5 to the electric meter head 10, and the electric meter head 10 is electrically connected to the solenoid valve 11 to realize a control closed loop.

[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, the first regulating valve 12 and the second regulating valve 13 are used to adjust the gas pressure sent into the autoclave 1 and the thin-walled tube 2 to be tested by the gas booster pump 3, and adjust the external pressure and the 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 air supply pipe 6 and close to the air inlet end of the autoclave 1, and 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 air supply pipe 7 and close to the air inlet end of the thin-walled tube 2 to be tested, and 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 is provided with an electric heating wire inside, and the heating jacket 20 is sleeved on the outer surface of the autoclave 1, and the temperature of the autoclave 1 is controlled by adjusting the power of the electric heating wire; an asbestos layer is provided on the outer surface of the heating jacket 20 for heat preservation and maintaining a constant temperature; a thermocouple is provided in the autoclave 1 for detecting the temperature of the autoclave 1. The autoclave 1 is provided on a support plate, and the lower surfaces of the heating jacket 20 and the asbestos layer are flush with the bottom surface of the autoclave 1 and are provided together on the support plate, and the lower end of the thin-walled tube 2 to be tested passes through the support plate and extends downward.

[0052] In this embodiment, it also 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 sleeved on the outer surface of the thin-walled tube 2 to be tested outside the autoclave 1, and the sealing ferrule 22 is arranged 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 arranged on the outer surface of the sealing sleeve, and the function of the water-cooling jacket 25 is to prevent the heated argon gas from causing heat damage to the sealing sleeve 21 and the sealing ferrule 22.

[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 sleeve 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; the 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 on 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 also provides a high-throughput testing method for in-situ high-temperature circumferential creep of a thin-walled tube, comprising:

[0055] S1: Argon is respectively sent 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, and the air in the autoclave 1 and the thin-walled tube 2 to be tested are exhausted;

[0056] S2: adjusting the temperature of the autoclave 1 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, so that a pressure difference is generated inside and outside the thin-walled tube 2 to be tested, until a preset pressure difference is reached; at the same time, the first regulating valve 12, the second regulating valve 13, the first ball valve 16 and the second ball valve 17 are closed to seal the internal and external environments of the thin-walled tube 2 to be tested, and maintain the preset internal and external pressures and pressure differences;

[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", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-throughput test 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 high pressure autoclave (1), the high pressure 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 penetrate the high pressure 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; The temperature control mechanism is used to control the temperature of the autoclave (1).

2. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 1, characterized in that: The pressure control mechanism comprises: A gas booster pump (3), connected to the inert gas bottle (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 end of the autoclave (1); A second air supply pipe (7), one end of which is connected to the gas booster pump (3), and the other end of which is connected to the air inlet end 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), and the first regulating valve (12) and the second regulating valve (13) are used to adjust the air pressure sent by the gas booster pump (3) into the autoclave (1) and the thin-walled tube (2) to be tested, and to adjust 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); The second exhaust pipe (15) is connected to the exhaust 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).

3. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 2, characterized in that: Also includes: An air supply main pipe (5), one end of which is connected to the gas booster pump (3), and the other end of which is respectively connected to the first air supply pipe (6) and the second air supply pipe (7); a main valve (8) is provided on the air supply main pipe (5).

4. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 2, characterized in that: Also includes: A first pressure gauge (18) is arranged on the first gas supply pipe (6) and close to the gas inlet end of the autoclave (1), and 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 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) is used to detect and display the internal pressure of the thin-walled tube (2) to be tested.

5. The high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 1, characterized in that: The temperature control mechanism comprises: A heating jacket (20) having an electric heating wire disposed therein, the heating jacket (20) being sleeved 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 is arranged in the autoclave (1) and is used to detect the temperature of the autoclave (1).

6. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 5, characterized in that: Also includes: Sealing sleeves, through which both ends of the thin-walled tube (2) to be tested are connected to the autoclave (1); A water cooling jacket (25) is arranged on the outer surface of the sealing jacket.

7. A high-throughput testing device for in-situ high-temperature circumferential creep of thin-walled tubes according to claim 1, characterized in that: Also includes: An observation channel (23), one end of which passes through the autoclave (1) and corresponds to the thin-walled tube (2) to be tested, and the other end of which extends in a direction away from the thin-walled tube (2) to be tested, wherein a plurality of the observation channels (23) are symmetrically arranged on the left and right sides of the thin-walled tube (2) to be tested; A laser rangefinder (24) is arranged at the other end of the observation channel (23), and 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.

8. A high-throughput test method for in-situ high-temperature circumferential creep of thin-walled tubes, characterized in that: include: S1: Inert gas is respectively sent into the autoclave (1) and the thin-walled tube (2) to be tested in the autoclave (1) by 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 that a pressure difference is generated inside and outside 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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