Device and method for detecting sealing performance of butt joint port of vacuum type underwater manned platform

Abstract

The invention discloses a vacuum type underwater manned platform butt joint port sealing performance detection device and detection method, and belongs to the field of underwater manned platform rescue. The device comprises an external 220V power supply and a detection control box, an air pipe quick connector, a mechanical pressure gauge, a temperature and humidity sensor and a pressure sensor are installed on a negative pressure shell, and a vacuum pump is connected with the air pipe quick connector through an air pipeline via an electromagnetic valve. The high-voltage power line is connected with the detection control box, the electromagnetic valve is connected with the detection control box through the low-voltage power line, and the pressure sensor and the temperature and humidity sensor are connected with the detection control box through signal lines. Under the action of the vacuum pump, negative pressure is formed after air between the negative pressure shell and the detected object is exhausted, and the pressure change is monitored in real time through the pressure sensor, so that the sealing performance of the detected object is judged. The situation that the rescue activity of the underwater manned platform fails due to the fact that the sealing performance of the docking port of the underwater manned platform is poor is avoided.

Description

Technical Field

[0001] The present invention relates to the field of underwater manned platform rescue, and particularly to a vacuum type underwater manned platform docking port sealing detection device and a detection method. Background Art

[0002] When an underwater manned platform has an accident in deep sea and cannot float up, the personnel in the underwater manned platform need to be transferred out of the underwater manned platform. Due to the large water pressure in the deep sea, the personnel in the underwater manned platform cannot directly float to the water surface with gas cylinders, otherwise decompression sickness or even direct death will occur. Therefore, it is necessary to carry out underwater manned platform rescue. The underwater manned platform rescue methods are mainly divided into two categories: self-rescue and external rescue. When the personnel in the underwater manned platform are unable to self-rescue, external rescue must be carried out on the personnel in the underwater manned platform. The principle is to use the docking port of the underwater manned platform life-saving equipment to dock with the docking port of the crashed underwater manned platform, form a hard seal and balance the pressure inside the underwater manned platform, establish a transfer channel between the rescue equipment and the underwater manned platform, transfer the crew in the crashed underwater manned platform to the underwater manned platform rescue equipment, and then transfer them to the rescue mother ship by the underwater manned platform rescue equipment to complete the rescue of the crashed crew.

[0003] Because underwater rescue platforms are difficult and rescue time is crucial to the safety of occupants, training in underwater rescue-related subjects has always been a key component of underwater rescue activities. The principles of rescue operations clearly demonstrate that ensuring a sealed space between the lifesaving equipment and the wrecked underwater platform is crucial to the success of these activities. While strict protective measures are in place during the operation of underwater platforms, such as prohibiting contact with hard objects or even shoe soles, and regularly replacing sealing rings to ensure the platform's tightness, the harsh operating environment of underwater platforms, characterized by turbulent currents, strong winds, and high waves, inevitably causes damage to the platforms. Furthermore, during rescue operations, the complex and ever-changing seabed conditions can cause the underwater platform's docking interface to face different directions. Adjusting the angle of the rescue equipment docking interface to the wrecked underwater platform is the most difficult and tedious task, inevitably resulting in friction and damage to the underwater platform's docking interface, which in turn affects the sealing. Furthermore, long-serving underwater manned platforms can also experience weld cracking and other damage in the rescue platform area, a significant factor affecting the sealing performance of the docking platform. Therefore, timely and accurate testing of the sealing performance of underwater manned platforms' docking interfaces is crucial for preventing unsafe underwater manned platforms from entering training, impacting the effectiveness of rescue operations, and avoiding waste of manpower, material, and financial resources. This represents a pressing technical challenge. Methods for testing ship sealing performance primarily include flooding, inflation, flushing, and spraying, but these traditional methods primarily focus on testing the sealing performance of internal ship structures. For example, the patent "Ship Sealing Test Device and Method (CN109855803A)" can be used to test the sealing performance of bulkhead joints, but is not suitable for testing the sealing performance of open structures such as underwater manned platform docking interfaces. The present invention provides a vacuum-type underwater manned platform docking interface sealing test device and method, enabling accurate testing of the sealing performance of underwater manned platform docking interfaces. Summary of the Invention

[0004] The purpose of the present invention is to provide a vacuum underwater manned platform interface sealing detection device and detection method, through the real-time monitoring of the air pressure in the detection device to achieve accurate evaluation of the underwater manned platform interface sealing.

[0005] The technical solution of the present invention is:

[0006] A vacuum-type underwater manned platform docking interface sealing detection device comprises: an external 220V power supply 1, a detection control box 2, a negative pressure shell 9, a trachea quick connector 10, a mechanical pressure gauge 11, a temperature and humidity sensor 12, a pressure sensor 13, an air pipeline 14, a solenoid valve 15, a vacuum pump 16, a low-voltage power line 17, and a high-voltage power line 18.

[0007] The settings of each part of the present invention are as follows:

[0008] The detection control box 2 includes a main switch 3, a start button 4, a display screen 5, an indicator light A 6 and an indicator light B 7.

[0009] Further, the main switch 3 is the power switch for the entire vacuum underwater manned platform interface sealing detection device. The start button 4 is used to start and stop the detection work. The display screen 5 is used to display the values of pressure, temperature, and humidity detected by the pressure sensor 13 and the temperature and humidity sensor 12. The indicator light A 6 is used to indicate that there is a problem with the sealing by flashing. The indicator light B 7 is used to indicate that the sealing is good by flashing.

[0010] The external 220V power supply 1 is used to supply power to the detection control box 2.

[0011] The air pipe quick connector 10, the mechanical pressure gauge 11, the temperature and humidity sensor 12, and the pressure sensor 13 are fixed on the negative pressure shell 9. The pressure sensor 13 and the temperature and humidity sensor 12 are connected to the detection control box 2 through a signal line 8. One end of the air pipe quick connector 10 communicates with the sealed cavity between the negative pressure shell 9 and the object to be detected, and the other end is sequentially connected to the solenoid valve 15 and the vacuum pump 16 through an air pipeline 14. The solenoid valve 15 is connected to the detection control box 2 through a low-voltage power line 17, and the vacuum pump 16 is connected to the detection control box 2 through a high-voltage power line 18.

[0012] After using the vacuum pump 16 to evacuate the sealed cavity between the negative pressure shell 9 and the object to be detected to form a negative pressure cavity, the air pipeline 14 is quickly switched on and off through the solenoid valve 15. The change in the pressure in the negative pressure cavity is monitored in real time by the pressure sensor 13, and the change in the temperature and humidity in the negative pressure cavity is monitored in real time by the temperature and humidity sensor 12. On the basis of considering the influence of temperature and humidity on the change in the pressure in the negative pressure cavity, a reasonable evaluation of the sealing performance of the object to be detected is made according to the change in the pressure in the negative pressure cavity.

[0013] The mechanical pressure gauge 11 is used to detect the air pressure inside the negative pressure shell 9. A plurality of pressure sensors 13 are arranged on the negative pressure shell 9 in a uniform distribution to detect the change in the pressure of the sealed cavity between the negative pressure shell 9 and the object to be detected. The temperature and humidity sensor 12 is used to detect the temperature and humidity of the sealed cavity between the negative pressure shell 9 and the object to be detected.

[0014] The effects and benefits of the present invention are as follows: (1) The negative pressure shell is docked with the interface of the underwater manned platform to form a closed space, simulating the docking state of the life-saving equipment and the interface of the crashed underwater manned platform; (2) The pressure in the closed cavity is adjusted by a vacuum pump, simulating the load-bearing state of the interface of the underwater manned platform during underwater rescue; (3) The precise control of the solenoid valve realizes the precise regulation of the pressure in the sealed cavity; (4) The change of the air pressure in the sealed cavity is monitored by a high-precision pressure sensor to quickly detect the sealing performance of the life-saving platform; (5) The precise measurement of the temperature and humidity sensor avoids misjudgment caused by the change of the pressure in the sealed cavity due to environmental changes; (6) The whole detection process has a short operation time and is carried out when the underwater manned platform is docked. The operation is simple and does not affect the normal use of the underwater manned platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a sealing performance detection device for the interface of an underwater manned platform in a vacuum type.

[0016] Figure 2 is a side view of the docking state of the sealing performance detection device and the interface of the underwater manned platform.

[0017] Figure 3 is a schematic diagram of the relative position relationship between the sealing performance detection device and the interface of the underwater manned platform.

[0018] In the figure: 1 external 220V power supply, 2 detection control box, 3 main switch, 4 start button, 5 display screen, 6 indicator light A, 7 indicator light B, 8 signal line, 9 negative pressure shell, 10 air pipe quick connector, 11 mechanical pressure gauge, 12 temperature and humidity sensor, 13 pressure sensor, 14 air pipeline, 15 solenoid valve, 16 vacuum pump, 17 low-voltage power line, 18 high-voltage power line, 19 sealing ring, 20 interface of the underwater manned platform. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following details the specific implementation manners of the present invention in combination with the technical solutions and the drawings.

[0020] Before the test, the detection device is first calibrated to obtain the variation law of the pressure P0 in the sealed cavity with time t under the pressure-bearing state of the detection device, which is used as the reference benchmark for the sealing performance detection of the interface of the underwater manned platform. The calibration process is described as follows. As Figure 2 shown, the interface 20 of the underwater manned platform is replaced by a steel plate. It is required that the thickness of the steel plate is not less than 5 mm, the flatness is not more than 0.2 mm, and the surface roughness is not more than 6.35. The detection device is started to make the sealed cavity formed between the negative pressure shell 9 and the steel plate reach a certain negative pressure P0. Preferably, P0 = -60 kPa, and the negative sign indicates negative pressure. Thereafter, the variation law of P0 with time is recorded, and the pressure change rate is calculated , where P1 is the air pressure value in the sealed cavity after time t1, preferably t1 = 10 min, and t0 is the start time.

[0021] As Figure 2 shown, place the detection device on the docking interface 20 of the underwater manned platform to ensure that there is no foreign object between the sealing ring 19 and the docking interface 20 of the underwater manned platform. Since the sealing ring 19 is usually smaller than the docking interface 20 of the underwater manned platform, to ensure the accuracy of the detection results, it is necessary to adjust the relative position relationship between the sealing ring 19 and the docking interface 20 of the underwater manned platform and then conduct multiple measurements, as Figure 3 shown. Taking Figure 3 the first position relationship in

[0022] As Figure 1 shown, first turn on the main switch 3 to power on the device, observe whether the values of the pressure sensor 13 and the temperature and humidity sensor 12 are correct through the display screen 5, and judge whether the device is operating normally based on this. After confirming that the device is normal, turn on the start button 4 to start the detection. At this time, the vacuum pump 16 will start, and the air in the sealed cavity formed between the negative pressure shell 9 and the docking interface 20 of the underwater manned platform will be pumped out, and the air pressure in the sealed cavity will decrease accordingly. When the air pressure in the sealed cavity reaches the set value P0, the vacuum pump 16 stops working, and at the same time, the solenoid valve 15 closes the air pipeline 14 to make the sealed cavity enter the pressure-holding state. After t1 time, the pressure in the sealed cavity becomes P2, and at the same time, record the change amounts of the temperature and humidity in the sealed cavity during this process and , calculate the pressure change rate , and compare it with the characteristics of the device itself after excluding the influence of temperature and humidity changes on the pressure to obtain the sealing performance of the docking interface of the underwater manned platform.

[0023] When considering the influence of temperature and humidity on the pressure change in the sealed cavity, the calculation method is as follows:

[0024] (1) When only considering the influence of temperature, that is, when , the pressure change rate calculation formula is corrected to: , where T0 is the temperature at the detection site.

[0025] (2) When only considering the influence of humidity, that is, when , the pressure change rate calculation formula is corrected to: , where H0 is the relative humidity at the detection site, and λ is the correction coefficient, preferably λ = 0.1.

[0026] (3) When considering the influence of both temperature and humidity on the pressure change at the same time, the pressure change rate calculation formula is corrected to: .

[0027] During the detection process, the judgment of the tightness of the interface 20 of the underwater manned platform can be determined according to the following rules:

[0028] (1) Within the time t2 after the vacuum pump 16 starts to work, the pressure change in the sealing cavity is very small, δP = (P2 - P0), then there is a problem with the tightness of the interface 20 of the underwater manned platform, and the indicator light A6 flashes. Preferably, δP ≤ 5 kPa and t2 = 10 min.

[0029] (2) When there is a problem with the tightness of the interface 20 of the underwater manned platform, and the indicator light A6 flashes.

[0030] (3) When the tightness of the interface 20 of the underwater manned platform is good, and the indicator light B7 flashes.

Claims

1. A sealing performance detection device for the interface of a vacuum underwater manned platform, characterized in that, Including: An external 220V power supply (1), a detection control box (2), a negative pressure shell (9), an air pipe quick connector (10), a mechanical pressure gauge (11), a temperature and humidity sensor (12), a pressure sensor (13), an air pipeline (14), a solenoid valve (15), a vacuum pump (16), a low-voltage power cord (17), and a high-voltage power cord (18); The detection control box (2) includes a main switch (3), a start button (4), a display screen (5), an indicator light A (6), and an indicator light B (7). The external 220V power supply (1) is used to supply power to the detection control box (2); The air pipe quick connector (10), the mechanical pressure gauge (11), the temperature and humidity sensor (12), and the pressure sensor (13) are fixed on the negative pressure shell (9). The pressure sensor (13) and the temperature and humidity sensor (12) are connected to the detection control box (2) through a signal line (8); One end of the air pipe quick connector (10) communicates with the sealed cavity between the negative pressure shell (9) and the object to be detected, and the other end is sequentially connected to the solenoid valve (15) and the vacuum pump (16) through the air pipeline (14). The solenoid valve (15) is connected to the detection control box (2) through the low-voltage power cord (17), and the vacuum pump (16) is connected to the detection control box (2) through the high-voltage power cord (18).

2. The sealing performance detection device for the interface of a vacuum underwater manned platform according to claim 1, wherein, The main switch (3) is the power switch for the entire vacuum underwater manned platform docking port sealing detection device. The start button (4) is used to start and stop the detection work. The display screen (5) is used to display the pressure, temperature, and humidity values detected by the pressure sensor (13) and the temperature and humidity sensor (12). The indicator light A (6) is used to indicate that there is a problem with the seal through flashing, and the indicator light B (7) is used to indicate that the seal is good through flashing.

3. A sealing performance detection device for the docking interface of a vacuum underwater manned platform according to claim 1, characterized in that, The mechanical pressure gauge (11) is used to detect other pressures inside the negative pressure shell. Multiple pressure sensors (13) are evenly distributed on the negative pressure shell (9) and are used to detect the pressure change of the sealed cavity between the negative pressure shell (9) and the object to be detected. The temperature and humidity sensor (12) is used to detect the temperature and humidity of the sealed cavity between the negative pressure shell (9) and the object to be detected.

4. A method for detecting the sealing performance of the docking interface of a vacuum underwater manned platform using a device for detecting the sealing performance of the docking interface of a vacuum underwater manned platform according to any one of claims 1-3, characterized in that, After using the vacuum pump (16) to evacuate the sealed cavity between the negative pressure shell (9) and the object to be detected to form a negative pressure cavity, the solenoid valve (15) is used to achieve the rapid on-off of the air pipeline (14). The pressure change in the negative pressure cavity is monitored in real time through the pressure sensor (13), and the temperature and humidity changes in the negative pressure cavity are monitored in real time through the temperature and humidity sensor (12). On the basis of considering the influence of temperature and humidity on the pressure change in the negative pressure cavity, a reasonable evaluation of the seal of the object to be detected is made according to the pressure change in the negative pressure cavity.

5. A method for detecting the sealing performance of the docking interface of a vacuum underwater manned platform according to claim 1, characterized in that, Calibration process of the sealing performance detection device for the docking interface of the vacuum underwater manned platform: Replace the docking interface (20) of the underwater manned platform with a steel plate, requiring that the thickness of the steel plate is not less than 5 mm, the flatness is not more than 0.2 mm, and the surface roughness is not more than 6.35; Start the detection device to make the sealing cavity formed between the negative pressure shell (9) and the steel plate reach a certain negative pressure P0; Thereafter, record the variation law of P0 with time and calculate the pressure change rate , where P1 is the air pressure value in the sealing cavity after time t1, and t0 is the start time.

6. The method for detecting the sealing performance of the interface of a vacuum underwater manned platform according to claim 1, wherein, Consider the influence of temperature and humidity on the pressure change in the negative pressure chamber: (1) When only considering the influence of temperature, that is, when ∆T≠0, the calculation formula for the pressure change rate is corrected as: , where T0 is the temperature at the detection site; (2) When only considering the influence of humidity, that is, when ∆H≠0, the calculation formula for the pressure change rate is corrected as: , where H0 is the relative humidity at the detection site and λ is the correction coefficient; (3) When considering the influence of both temperature and humidity on the pressure change at the same time, the calculation formula for the pressure change rate is corrected as: .

7. A method for detecting the sealing performance of the interface of a vacuum underwater manned platform according to claim 1, characterized in that, Method for determining the sealing performance of the docking interface of the underwater manned platform: within the time t2 after the vacuum pump (16) starts to work, if the pressure change in the sealing cavity is very small, δP = (P2 - P0), it indicates that there is a problem with the sealing performance of the docking interface (20) of the underwater manned platform, and the indicator light A (6) flashes; (2) When If this is the case, it indicates that there is a problem with the sealing performance of the docking interface (20) of the underwater manned platform, and the indicator light A (6) flashes; (3) When If this is the case, it indicates that the sealing performance of the docking interface (20) of the underwater manned platform is good, and the indicator light B (7) flashes.

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