Liquid oxygen phase change fracturing testing device and testing method

Abstract

The invention discloses a liquid oxygen phase change fracturing testing device and method, and relates to the field of liquid oxygen phase change fracturing, the liquid oxygen phase change fracturing testing device comprises a testing pipe, a liquid oxygen input pipe is fixed at one end of the testing pipe, a critical protection mechanism is arranged at the end, away from the liquid oxygen input pipe, of the testing pipe, and an auxiliary pressure release mechanism is arranged in the testing pipe. When the pressure generated when liquid oxygen becomes gas and expands exceeds the limit borne by the test tube, the pressure triggers the critical protection mechanism, the critical protection mechanism moves in the test tube, the containing space in the test tube is increased, and the temporary protection mechanism moves and drives the auxiliary pressure release mechanism at the same time; the auxiliary pressure release mechanism releases the pressure in the test tube, so that the possibility that the test tube is damaged due to the fact that the pressure exceeds the pressure borne by the test tube during testing and normal use of the test tube next time is affected can be reduced, and the test tube can be further protected.

Description

Technical Field

[0001] The present application relates to the field of liquid oxygen phase change fracturing, and in particular to a liquid oxygen phase change fracturing testing device and a testing method. Background Art

[0002] Liquid oxygen phase change technology is a technology that uses the energy generated by liquid oxygen during the phase change process to achieve specific purposes. In engineering applications, this technology can be used for rock cracking or other scenarios that require energy release. As a clean energy source, liquid oxygen does not produce harmful byproducts during its use and has little impact on the environment. Compared with traditional explosive blasting methods, liquid oxygen phase change technology can provide higher safety because it does not involve flammable and explosive substances.

[0003] The existing Chinese patent (publication number: CN118130530A) mentions a liquid oxygen phase change fracturing research and testing device and a testing method, which can obtain the pressure field, temperature field distribution and specific explosion process images at various positions during the explosion process, and relates to the field of liquid oxygen explosion technology. The liquid oxygen phase change fracturing research and testing device comprises: a containing tube, the containing tube comprises a metal tube section and a transparent tube section, the metal tube section is arranged at both ends of the containing tube, the transparent tube section is arranged at the middle position of the containing tube, the transparent tube section is fixedly connected to the metal tube section, the first end of the metal tube section at both ends of the containing tube is a cover body, and the second end of the metal tube section is a closed end; combustibles; an oxygen supply pipe; an exhaust pipe; an ignition head; a sensor is installed on the surface of the metal tube section, at least for collecting the temperature and pressure during the liquid oxygen phase change fracturing process; a data processing device is placed on the first side of the containing tube and is electrically connected to the sensor.

[0004] However, in actual test experiments, the metal tubes used to withstand the phase change pressure of liquid oxygen have a bearing limit. When the pressure exceeds the bearing limit of the metal tubes, the metal tubes may be deformed or damaged by the pressure, which directly affects the use of the metal tubes in the next experiment and poses a safety hazard. Summary of the invention

[0005] The purpose of the present application is to solve the problem that the metal tube used to withstand the liquid oxygen phase change pressure has a bearing limit as proposed in the above background technology. When the pressure exceeds the bearing limit of the metal tube, the metal tube may be deformed or damaged by the pressure, which directly affects the use of the metal tube in the next experiment and there are safety hazards. The present application provides a liquid oxygen phase change fracturing test device and a test method.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A liquid oxygen phase change fracturing test device comprises a test tube, two symmetrical support seats are fixed on the test tube, an ignition device is fixed on the test tube, a pressure sensor is fixed on the test tube, a temperature sensor is fixed on the test tube, a liquid oxygen input pipe is fixed at one end of the test tube, an exhaust pipe is fixed at the end of the test tube close to the liquid oxygen input pipe, a critical protection mechanism is arranged at the end of the test tube away from the liquid oxygen input pipe, an auxiliary pressure release mechanism is arranged in the test tube, a control panel is arranged on one side of the test tube section, and the control panel is electrically connected to the temperature sensor, the ignition device and the pressure sensor.

[0007] By adopting the above technical solution, when the pressure of liquid oxygen expanding into gas exceeds the limit of the test tube, the pressure triggers the critical protection mechanism, and the critical protection mechanism moves in the test tube to increase the accommodating space in the test tube. While the temporary protection mechanism moves, it drives the auxiliary pressure release mechanism, and the auxiliary pressure release mechanism releases the pressure in the test tube, thereby reducing the possibility of the test tube being damaged by the pressure exceeding the test tube's tolerance during testing, which affects the normal use next time, and can further protect the test tube.

[0008] Furthermore, the critical protection mechanism includes a buffer plate slidably connected in the test tube, a buffer cylinder is provided on the side of the buffer plate away from the liquid oxygen input pipe, the telescopic end of the buffer cylinder is fixedly connected to the buffer plate, a critical pressure sensor is provided on the side of the buffer plate away from the buffer cylinder, the critical pressure sensor is fixedly connected to the buffer plate, and a limiting component is provided between the buffer plate and the test tube.

[0009] By adopting the above technical solution, the critical pressure sensor on the buffer plate also measures the pressure in the test tube. When the critical pressure sensor is subjected to a pressure exceeding the bearing limit of the test tube, the control panel controls the limiting component to release the restriction on the buffer plate, allowing the buffer plate to move under the push of pressure. The buffer cylinder supports the buffer plate, allowing the buffer plate to move slowly, thereby increasing the test volume in the test tube, thereby reducing the possibility of the test tube being damaged by a pressure exceeding the test tube's bearing capacity during testing, thereby affecting the next normal use.

[0010] Furthermore, the limiting assembly includes two fixed blocks symmetrically fixed on the test tube, a hydraulic telescopic rod is fixed on the fixed block, the telescopic end of the hydraulic telescopic rod passes through the test tube, and the side of the telescopic end of the hydraulic telescopic rod conflicts with the buffer plate.

[0011] By adopting the above technical solution, the critical pressure sensor transmits the signal to the control panel, and the control panel controls the operation of the hydraulic telescopic rod to retract the telescopic end of the hydraulic telescopic rod, thereby reducing the possibility of the buffer plate moving and affecting pressure monitoring during normal testing.

[0012] Furthermore, the auxiliary pressure release mechanism includes two pressure release blocks symmetrically arranged on the test tube, the pressure release blocks penetrate the test tube and are slidably connected to the test tube, a U-shaped exhaust port is opened on the pressure release block, and a release assembly is arranged between the pressure release block and the test tube.

[0013] By adopting the above technical solution, the buffer plate drives the release component, and the release component drives the pressure release block, so that one end of the U-shaped exhaust port on the pressure release block is located in the test tube, and the other end extends out of the test tube, so that the pressurized gas in the test tube is discharged from the U-shaped exhaust port on the pressure release block, thereby alleviating the pressure in the test tube, thereby further reducing the possibility of the test tube being damaged by pressure exceeding its tolerance range.

[0014] Further, the release assembly includes two interference bevel blocks symmetrically arranged on the test tube, the interference bevel blocks penetrate the test tube and are slidably connected to the test tube, the inclined surface of the interference bevel blocks faces the buffer disk, a connecting block is fixed to the end of the interference block away from the inclined surface, a supporting block is slidably connected to the connecting block, the supporting block is fixedly connected to the test tube, and the end of the connecting block away from the interference bevel blocks is fixedly connected to the pressure release block.

[0015] By adopting the above technical solution, when the buffer disk moves, the buffer disk squeezes the inclined surface of the resistance inclined block, allowing the resistance inclined block to slide on the test tube, and then the resistance inclined block drives the connecting block, and the connecting block drives the pressure release block, thereby facilitating the movement of the pressure release block and extending one end of the U-shaped exhaust port on the pressure release block out of the test tube.

[0016] Furthermore, a plurality of high-pressure springs are arranged between the connecting block and the supporting block, and both ends of the high-pressure springs are fixedly connected to the connecting block and the supporting block.

[0017] By adopting the above technical solution, the high-pressure spring on the support block is used to support the connection block, thereby reducing the possibility of the pressure release block and the interference inclined block moving around during testing.

[0018] Furthermore, the two abutting inclined blocks are both fixed with limit blocks, and the limit blocks correspond to the buffer disk.

[0019] By adopting the above technical solution, when the buffer disk contacts the limit block, under the push of pressure and the restriction of the limit block, the buffer disk keeps the contacting inclined block extending out of the test tube, so that the pressure release block can keep exhausting.

[0020] A testing method for a liquid oxygen phase change cracking testing device, the testing method comprising: S1: When conducting a liquid oxygen phase change cracking test, firstly, liquid oxygen is input into the test tube from the liquid oxygen input pipe, and the amount of liquid oxygen is determined according to the actual test needs. At the same time, the temperature and pressure are recorded by the pressure sensor and the temperature sensor, and uploaded to the control panel; S2: Then use the control panel to control the ignition device, so that the ignition device converts the liquid oxygen in the test tube into gas. The test tube is subjected to the pressure of the liquid oxygen being converted into gas. At the same time, the pressure sensor and the temperature sensor record the temperature and pressure in the test tube. After the test is completed, the high-pressure gas in the test tube is discharged from the exhaust pipe. S3: When the pressure of the gas in the test tube exceeds the critical point of the test tube, the critical pressure sensor transmits the pressure signal to the control panel, and then the control panel retracts the telescopic end of the hydraulic telescopic rod, allowing the buffer plate to move under the support of the buffer cylinder, so that the space in the test tube becomes larger; S4: When the buffer plate moves to the abutment ramp block, the buffer plate squeezes the abutment ramp block, allowing the abutment ramp block to drive the pressure release block, so that one end of the U-shaped exhaust port on the pressure release block is located inside the test tube, and the other end is located outside the test tube, for emergency pressure relief, to protect the test tube and reduce the possibility of damage to the test tube due to high pressure during testing.

[0021] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, when the pressure in the test tube exceeds a critical value, the critical pressure sensor transmits a signal to the control panel, and the control panel controls the hydraulic telescopic rod to operate, so that the telescopic end of the hydraulic telescopic rod is retracted, and the telescopic end of the hydraulic telescopic rod releases the restriction on the buffer plate, so that the buffer plate can move in the direction of the buffer cylinder. With the movement of the buffer plate, the test volume in the test tube is increased, thereby achieving the purpose of reducing the possibility of the test tube being damaged by a pressure exceeding the test tube's tolerance during testing, thereby affecting the next normal use, and reducing the possibility of the test tube being damaged during testing and affecting safety.

[0022] 2. In the present application, while the buffer disk moves, the buffer disk squeezes the inclined surface of the resistance inclined block to allow the resistance inclined block to slide on the test tube, and then the resistance inclined block drives the connecting block to slide on the supporting block, and then the connecting block drives the pressure release block to slide on the test tube, so that one end of the U-shaped exhaust port on the pressure release block is located in the test tube and the other end extends out of the test tube, so that the pressurized gas in the test tube is discharged from the U-shaped exhaust port on the pressure release block, thereby alleviating the pressure in the test tube, thereby achieving the purpose of further reducing the damage to the test tube caused by pressure exceeding the tolerance range.

[0023] 3. In the present application, when the buffer disk squeezes the inclined surface of the resistance inclined block, the buffer disk slides on the inclined surface of the resistance inclined block. When the buffer disk hits the limit block, under the push of pressure and the restriction of the limit block, the buffer disk keeps the resistance inclined block extending out of the test tube and the pressure release block keeps exhausting. This achieves the purpose of allowing the buffer disk to always squeeze the resistance inclined block when subjected to high pressure and allowing the pressure release block to keep exhausting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a first three-dimensional structural schematic diagram of the liquid oxygen phase change fracturing test device in the present application; Figure 2 It is a second three-dimensional structural schematic diagram of the liquid oxygen phase change cracking test device in the present application; Figure 3 It is a third three-dimensional structural schematic diagram of the liquid oxygen phase change fracturing test device in the present application; Figure 4 This application Figure 2 The enlarged schematic diagram at A in the middle; Figure 5 This application Figure 3 Enlarged schematic diagram of point B in the middle.

[0025] Description of reference numerals: 1. Test tube; 2. Support seat; 3. Ignition device; 4. Pressure sensor; 5. Temperature sensor; 6. Liquid oxygen input pipe; 7. Exhaust pipe; 8. Critical protection mechanism; 81. Buffer plate; 82. Buffer cylinder; 83. Limiting assembly; 831. Fixing block; 832. Hydraulic telescopic rod; 84. Pressure critical sensor; 9. Auxiliary pressure release mechanism; 91. Pressure release block; 92. U-shaped exhaust port; 93. Release assembly; 931. Resistance bevel block; 932. Connecting block; 933. Support block; 934. High-pressure spring; 935. Limiting block; 10. Control panel. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-5 This application is described in further detail.

[0027] The embodiments of the present application disclose a liquid oxygen phase change cracking testing device and a testing method.

[0028] Reference Figure 1 , Figure 2 and Figure 3A liquid oxygen phase change fracturing test device comprises a test tube 1, two symmetrical support seats 2 are fixed on the test tube 1, an ignition device 3 is fixed on the test tube 1, a pressure sensor 4 is fixed on the test tube 1, a temperature sensor 5 is fixed on the test tube 1, a liquid oxygen input pipe 6 is fixed at one end of the test tube 1, an exhaust pipe 7 is fixed at the end of the test tube 1 close to the liquid oxygen input pipe 6, a critical protection mechanism 8 is arranged at the end of the test tube 1 away from the liquid oxygen input pipe 6, an auxiliary pressure release mechanism 9 is arranged in the test tube 1, and a control panel 10 is arranged on one side of the test tube 1 section, and the control panel 10 is electrically connected to the temperature sensor 5, the ignition device 3, and the pressure sensor 4.

[0029] When it is necessary to perform a liquid oxygen phase change fracturing test on the liquid oxygen phase change fracturing test device, a certain amount of liquid oxygen is first input from the liquid oxygen input pipe 6 on the test tube 1, and then the pressure sensor 4 and the temperature sensor 5 are used to record the corresponding data. Then, the control panel 10 is used to control the ignition device 3 to make the liquid in the test tube 1 change phase and turn the liquid oxygen into gas. After the liquid oxygen turns into gas, its volume expands and generates pressure. Then, the temperature sensor 5 and the pressure sensor 4 are used to record the expansion temperature and pressure. When the pressure of the expansion of the liquid oxygen into gas exceeds the limit that the test tube 1 can withstand, the pressure triggers the critical protection mechanism 8, and the critical protection mechanism 8 moves in the test tube 1 to increase the test pressure. The accommodating space in the test tube 1 drives the auxiliary pressure releasing mechanism 9 while the temporary protection mechanism moves. The auxiliary pressure releasing mechanism 9 releases the pressure in the test tube 1. After the experiment, the gas in the test tube 1 is discharged from the exhaust pipe 7. When the gas converted from liquid oxygen in the test tube 1 exceeds the limit that the test tube 1 can withstand, the pressure pushes the critical protection mechanism 8, so that the space used for testing in the test tube 1 becomes larger. At the same time, the critical protection mechanism 8 drives the auxiliary pressure releasing mechanism 9, thereby reducing the possibility that the test tube 1 will be damaged by the pressure exceeding the test tube 1 during the test, which affects the normal use next time, and can further protect the test tube 1.

[0030] Reference Figure 2 , Figure 3 and Figure 4 The critical protection mechanism 8 includes a buffer plate 81 slidably connected in the test tube 1, a buffer cylinder 82 is arranged on the side of the buffer plate 81 away from the liquid oxygen input pipe 6, the telescopic end of the buffer cylinder 82 is fixedly connected to the buffer plate 81, a critical pressure sensor 84 is arranged on the side of the buffer plate 81 away from the buffer cylinder 82, the critical pressure sensor 84 is fixedly connected to the buffer plate 81, and a limiting component 83 is arranged between the buffer plate 81 and the test tube 1.

[0031] When liquid oxygen turns into gas in the test tube 1, the pressure sensor 4 and the temperature sensor 5 record the pressure and temperature. At the same time, the critical pressure sensor 84 on the buffer tray 81 also measures the pressure in the test tube 1. When the critical pressure sensor 84 is subjected to a pressure exceeding the bearing limit of the test tube 1, the critical pressure sensor 84 uploads the pressure value to the control panel 10. The control panel 10 controls the limiting component 83 to release the restriction on the buffer tray 81, allowing the buffer tray 81 to move under the push of pressure. The buffer cylinder 82 supports the buffer tray 81, allowing the buffer tray 81 to move slowly. With the movement of the buffer tray 81, the test volume in the test tube 1 is increased to reduce the pressure on the test tube 1. When the critical pressure sensor 84 detects that the pressure exceeds the bearing limit of the test tube 1, the buffer tray 81 is moved under the support of the buffer cylinder 82 to increase the volume in the test tube 1, thereby reducing the possibility of damage to the test tube 1 caused by the pressure exceeding the bearing limit of the test tube 1 during the test, thereby affecting the normal use next time.

[0032] Reference Figure 2 , Figure 3 and Figure 4 The limiting assembly 83 includes two fixed blocks 831 symmetrically fixed on the test tube 1, and a hydraulic telescopic rod 832 is fixed on the fixed block 831. The telescopic end of the hydraulic telescopic rod 832 penetrates the test tube 1, and the side of the telescopic end of the hydraulic telescopic rod 832 conflicts with the buffer plate 81. When the pressure monitored by the critical pressure sensor 84 reaches a critical value, the critical pressure sensor 84 transmits a signal to the control panel 10, and the control panel 10 controls the hydraulic telescopic rod 832 to work, so that the telescopic end of the hydraulic telescopic rod 832 is retracted, and the telescopic end of the hydraulic telescopic rod 832 releases the restriction on the buffer plate 81, so that the buffer plate 81 can move in the direction of the buffer cylinder 82. By using the hydraulic telescopic rod 832 to restrict the buffer plate 81, the possibility of the buffer plate 81 moving and affecting the pressure monitoring during normal testing can be reduced.

[0033] Reference Figure 1 , Figure 3 and Figure 5The auxiliary pressure release mechanism 9 includes two pressure release blocks 91 symmetrically arranged on the test tube 1. The pressure release block 91 penetrates the test tube 1 and is slidably connected to the test tube 1. A U-shaped exhaust port 92 is provided on the pressure release block 91. A release assembly 93 is provided between the pressure release block 91 and the test tube 1. When the buffer plate 81 moves toward the buffer cylinder 82, when the buffer plate 81 moves almost to the limit under the support of the buffer cylinder 82, the buffer plate 81 drives the release assembly 93, and the release assembly 93 drives the pressure release block 91, so that one end of the U-shaped exhaust port 92 on the pressure release block 91 is located in the test tube 1, and the other end extends out of the test tube 1, so that the pressure gas in the test tube 1 is discharged from the U-shaped exhaust port 92 on the pressure release block 91, and the pressure in the test tube 1 is relieved. By squeezing the release assembly 93 when the buffer plate 81 moves, the release assembly 93 drives the pressure release block 91, so that the pressure gas in the test tube 1 is discharged from the U-shaped exhaust port 92, thereby further reducing the possibility of damage to the test tube 1 caused by pressure exceeding the tolerance range.

[0034] Reference Figure 1 , Figure 3 and Figure 5 The release assembly 93 includes two oblique interference blocks 931 symmetrically arranged on the test tube 1. The oblique interference block 931 penetrates the test tube 1 and is slidably connected to the test tube 1. The inclined surface of the oblique interference block 931 faces the buffer tray 81. A connecting block 932 is fixed at one end of the oblique interference block away from the inclined surface. A supporting block 933 is slidably connected to the connecting block 932. The supporting block 933 is fixedly connected to the test tube 1. The end of the connecting block 932 away from the oblique interference block 931 is fixedly connected to the pressure release block 91. When the buffer tray 81 moves, the buffer tray 81 squeezes the inclined surface of the resistance inclined block 931, allowing the resistance inclined block 931 to slide on the test tube 1, and then the resistance inclined block 931 drives the connecting block 932 to slide on the supporting block 933, and then the connecting block 932 drives the pressure release block 91 to slide on the test tube 1. By squeezing the resistance inclined block 931 when the buffer tray 81 moves, allowing the resistance inclined block 931 to drive the connecting block 932, and allowing the connecting block 932 to drive the pressure release block 91, the movement of the pressure release block 91 can be facilitated, and one end of the U-shaped exhaust port 92 on the pressure release block 91 can be conveniently extended out of the test tube 1.

[0035] Reference Figure 1 , Figure 3 and Figure 5A plurality of high-pressure springs 934 are arranged between the connection block 932 and the support block 933, and both ends of the high-pressure springs 934 are fixedly connected to the connection block 932 and the support block 933. When the buffer disk 81 has not moved, the high-pressure springs 934 on the support block 933 are used to support the connection block 932, so that the pressure release block 91 and the oblique block 931 on the connection block 932 remain in the test tube 1. By supporting the pressure release block 91 and the oblique block 931 with the high-pressure springs 934, the possibility of the pressure release block 91 and the oblique block 931 moving randomly during the test can be reduced.

[0036] Reference Figure 1 , Figure 3 and Figure 5 , the two oblique blocks 931 are both fixed with limit blocks 935, and the limit blocks 935 correspond to the buffer plate 81. When the buffer plate 81 presses the oblique surface of the oblique block 931, the buffer plate 81 slides on the oblique surface of the oblique block 931. When the buffer plate 81 contacts the limit blocks 935, under the push of pressure and the restriction of the limit blocks 935, the buffer plate 81 keeps the oblique block 931 extending out of the test tube 1, and the pressure release block 91 keeps exhausting. By using the limit blocks 935 to block the buffer plate 81, the buffer plate 81 can always keep pressing the oblique block 931 when subjected to high pressure, and the pressure release block 91 keeps exhausting.

[0037] A testing method for a liquid oxygen phase change fracturing testing device, which is applicable to any of the above-mentioned liquid oxygen phase change fracturing testing devices, is as follows: S1: When conducting a liquid oxygen phase change cracking test, firstly, liquid oxygen is input into the test tube 1 from the liquid oxygen input pipe 6, and the amount of liquid oxygen is determined according to the actual test needs. At the same time, the temperature and pressure are recorded by the pressure sensor 4 and the temperature sensor 5, and uploaded to the control panel 10; S2: Then, the control panel 10 is used to control the ignition device 3, so that the ignition device 3 converts the liquid oxygen in the test tube 1 into gas. The test tube 1 is subjected to the pressure of the liquid oxygen being converted into gas. At the same time, the pressure sensor 4 and the temperature sensor 5 record the temperature and pressure in the test tube 1. After the test is completed, the high-pressure gas in the test tube 1 is discharged from the exhaust pipe 7. S3: When the pressure of the gas in the test tube 1 exceeds the critical point that the test tube 1 can withstand, the critical pressure sensor 84 transmits a pressure signal to the control panel 10, and then the control panel 10 retracts the telescopic end of the hydraulic telescopic rod 832, allowing the buffer plate 81 to move under the support of the buffer cylinder 82, so that the space in the test tube 1 becomes larger; S4: When the buffer plate 81 moves to the abutting inclined block 931, the buffer plate 81 squeezes the abutting inclined block 931, so that the abutting inclined block 931 drives the pressure release block 91, so that one end of the U-shaped exhaust port 92 on the pressure release block 91 is located inside the test tube 1, and the other end is located outside the test tube 1, so as to perform emergency pressure relief, protect the test tube 1, and reduce the possibility of the test tube 1 being damaged by a large pressure during testing.

[0038] Working principle: When conducting a liquid oxygen phase change fracturing test, first input liquid oxygen from the liquid oxygen input pipe 6 into the test tube 1, determine the amount of liquid oxygen according to actual test needs, and use the pressure sensor 4 and the temperature sensor 5 to record the temperature and pressure. Then use the control panel 10 to control the ignition device 3, so that the ignition device 3 converts the liquid oxygen in the test tube 1 into gas. The test tube 1 withstands the pressure of the liquid oxygen turning into gas. At the same time, the pressure sensor 4 and the temperature sensor 5 record the temperature and pressure in the test tube 1. At the same time, the critical pressure sensor 84 on the buffer plate 81 also monitors the pressure in the test tube 1. When the pressure in the test tube 1 exceeds the critical value, the critical pressure sensor 84 transmits a signal to the control panel 10. The control panel 10 controls the hydraulic telescopic rod 832 to work, retract the telescopic end of the hydraulic telescopic rod 832, and let the hydraulic telescopic rod 832 retract. The telescopic end of 832 releases the restriction on the buffer plate 81, allowing the buffer plate 81 to move in the direction of the buffer cylinder 82. With the movement of the buffer plate 81, the test volume in the test tube 1 becomes larger, reducing the pressure on the test tube 1. At the same time, the buffer plate 81 squeezes the inclined surface of the resistance inclined block 931, allowing the resistance inclined block 931 to slide on the test tube 1, and then the resistance inclined block 931 drives the connecting block 932 to slide on the supporting block 933. Then the connecting block 932 drives the pressure release block 91 to slide on the test tube 1, so that one end of the U-shaped exhaust port 92 on the pressure release block 91 is located in the test tube 1, and the other end extends out of the test tube 1, so that the pressurized gas in the test tube 1 is discharged from the U-shaped exhaust port 92 on the pressure release block 91, thereby alleviating the pressure in the test tube 1 and ensuring the safe use of the test tube 1 and the test.

Claims

1. A liquid oxygen phase change cracking test device, comprising a test tube (1), characterized in that: Two symmetrical support seats (2) are fixed on the test tube (1), an ignition device (3) is fixed on the test tube (1), a pressure sensor (4) is fixed on the test tube (1), a temperature sensor (5) is fixed on the test tube (1), a liquid oxygen input pipe (6) is fixed on one end of the test tube (1), an exhaust pipe (7) is fixed on the end of the test tube (1) close to the liquid oxygen input pipe (6), a critical protection mechanism (8) is arranged on the end of the test tube (1) away from the liquid oxygen input pipe (6), an auxiliary pressure release mechanism (9) is arranged in the test tube (1), and a control panel (10) is arranged on one side of the test tube (1), and the control panel (10) is electrically connected to the temperature sensor (5), the ignition device (3), and the pressure sensor (4).

2. A liquid oxygen phase change cracking testing device according to claim 1, characterized in that: The critical protection mechanism (8) comprises a buffer plate (81) slidably connected in the test tube (1); a buffer oil cylinder (82) is provided on a side of the buffer plate (81) away from the liquid oxygen input tube (6); a telescopic end of the buffer oil cylinder (82) is fixedly connected to the buffer plate (81); a critical pressure sensor (84) is provided on a side of the buffer plate (81) away from the buffer oil cylinder (82); the critical pressure sensor (84) is fixedly connected to the buffer plate (81); and a limiting component (83) is provided between the buffer plate (81) and the test tube (1).

3. A liquid oxygen phase change cracking testing device according to claim 2, characterized in that: The limiting assembly (83) comprises two fixing blocks (831) symmetrically fixed on the test tube (1), a hydraulic telescopic rod (832) being fixed on the fixing blocks (831), the telescopic end of the hydraulic telescopic rod (832) passing through the test tube (1), and the side edge of the telescopic end of the hydraulic telescopic rod (832) abutting against the buffer plate (81).

4. A liquid oxygen phase change cracking testing device according to claim 2, characterized in that: The auxiliary pressure release mechanism (9) comprises two pressure release blocks (91) symmetrically arranged on the test tube (1); the pressure release blocks (91) penetrate the test tube (1) and are slidably connected to the test tube (1); a U-shaped exhaust port (92) is provided on the pressure release block (91); and a release assembly (93) is provided between the pressure release block (91) and the test tube (1).

5. A liquid oxygen phase change cracking testing device according to claim 4, characterized in that: The release assembly (93) comprises two oblique abutment blocks (931) symmetrically arranged on the test tube (1); the oblique abutment blocks (931) penetrate the test tube (1) and are slidably connected to the test tube (1); the oblique surface of the oblique abutment blocks (931) faces the buffer disk (81); a connecting block (932) is fixed to one end of the oblique abutment blocks away from the oblique surface; a supporting block (933) is slidably connected to the connecting block (932); the supporting block (933) is fixedly connected to the test tube (1); and one end of the connecting block (932) away from the oblique abutment blocks (931) is fixedly connected to the pressure release block (91).

6. A liquid oxygen phase change cracking testing device according to claim 2, characterized in that: A plurality of high-pressure springs (934) are provided between the connecting block (932) and the supporting block (933), and both ends of the high-pressure springs (934) are fixedly connected to the connecting block (932) and the supporting block (933).

7. A liquid oxygen phase change cracking testing device according to claim 5, characterized in that: The two abutting inclined blocks (931) are both fixed with limit blocks (935), and the limit blocks (935) correspond to the buffer plate (81).

8. A testing method for a liquid oxygen phase change cracking testing device, characterized in that: The test method is applicable to any one of the liquid oxygen phase change cracking test devices in claims 1-7 above, and the test method is: S1: When conducting a liquid oxygen phase change cracking test, firstly, liquid oxygen is input into the test tube (1) from the liquid oxygen input pipe (6), and the amount of liquid oxygen is determined according to actual test requirements. At the same time, the temperature and pressure are recorded using the pressure sensor (4) and the temperature sensor (5), and uploaded to the control panel (10); S2: Then, the control panel (10) is used to control the ignition device (3), so that the ignition device (3) converts the liquid oxygen in the test tube (1) into gas. The test tube (1) is subjected to the pressure of the liquid oxygen being converted into gas. At the same time, the pressure sensor (4) and the temperature sensor (5) record the temperature and pressure in the test tube (1). After the test is completed, the high-pressure gas in the test tube (1) is discharged from the exhaust pipe (7); S3: When the pressure of the gas in the test tube (1) exceeds the critical point that the test tube (1) can withstand, the critical pressure sensor (84) transmits a pressure signal to the control panel (10), and then the control panel (10) retracts the telescopic end of the hydraulic telescopic rod (832), allowing the buffer plate (81) to move under the support of the buffer cylinder (82), thereby increasing the space in the test tube (1); S4: When the buffer plate (81) moves to the abutting inclined block (931), the buffer plate (81) presses the abutting inclined block (931), so that the abutting inclined block (931) drives the pressure release block (91), so that one end of the U-shaped exhaust port (92) on the pressure release block (91) is located inside the test tube (1) and the other end is located outside the test tube (1), thereby performing emergency pressure relief, protecting the test tube (1), and reducing the possibility of the test tube (1) being damaged by a large pressure during testing.

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