Ship sealing door internal and external pressure test system

Abstract

The invention discloses a ship sealing door internal and external pressure test system, and belongs to the technical field of sealing door testing, the ship sealing door internal and external pressure test system comprises a detection base used for testing a to-be-tested sealing door, the detection base is internally provided with a liquid pressurization module, and the detection base is provided with a test assembly composed of a test bin, a bin cover, a mounting partition plate, a permeation assembly and an air pressure test assembly. Through the synergistic effect of the permeation pipe, the annular cold guide plate and the thermoelectric refrigeration sheet, liquid can be conveyed to a gap of the to-be-tested sealing door and quickly frozen, the phenomenon of microscopic ice permeation damage is actively made, and simulation of the water seepage and freezing working conditions of the ship sealing door in the polar region environment is achieved; in cooperation with an air pressure testing pipeline capable of flexibly switching pure nitrogen and helium nitrogen mixed gas through an electric control three-way valve, in one-time clamping, detection of two working conditions of leakage from the inside of a door to the outside of a cabin and pressing of the outside environment into the inside of the door is completed respectively by changing gas media and pressure of cavities on the two sides.

Description

Technical Field

[0001] This invention relates to the field of sealing door testing technology, and more particularly to a system for testing the internal and external pressure of a ship's sealing door. Background Technology

[0002] Ship sealing doors are facilities that ensure the watertightness and cabin safety of ships. For ships sailing in polar regions, in addition to the conventional wind and wave pressure, their sealing doors also face the challenges of extremely harsh environments such as low temperatures, seawater droplet leakage and instant freezing. The formation and expansion of ice in the sealing gaps is one of the main hidden dangers that lead to sealing failure and leakage. Existing technologies for testing the airtightness of ship sealing doors mostly use the differential pressure method or use tracer gas to detect micro-leakage. However, existing testing systems cannot actively simulate the gradual destructive process of trace seawater seepage and rapid freezing at the sealing interface, which is unique to the polar regions, when conducting watertight tests. Therefore, it is difficult to study the microscopic mechanism of ice damage on sealing materials and its long-term impact on sealing performance. Meanwhile, existing airtightness testing systems are often single-function, mostly only capable of unidirectional pressure testing, lacking testing methods for bidirectional sealing performance, such as preventing leakage on the inner side of the sealing door and resisting pressure on the outer side. To address this issue, a system for testing the internal and external pressure of ship sealing doors is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art that it is difficult to reproduce the sealing failure mechanism in polar environments and that bidirectional sealing performance cannot be tested independently, and to propose a ship sealing door internal and external pressure testing system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A ship sealing door internal and external pressure testing system includes a testing base for testing the sealing door under test. The testing base is equipped with a liquid pressurization module and a testing assembly. The testing assembly includes a testing chamber with a cover on top. The testing chamber has an installation partition inside and a through hole on its inner side. A permeation component is provided on the inner wall of the through hole. An upper testing chamber is formed above the installation partition, and a lower testing chamber is formed below the installation partition. Both the outer walls of the upper and lower testing chambers are equipped with air pressure testing components. The permeation assembly includes a door mounting frame, on the upper surface of which a sealed door to be tested is placed. The door mounting frame has a liquid permeation channel inside, and the surface of the door mounting frame has a mounting groove. An annular cold-conducting plate is installed in the mounting groove. Multiple thermoelectric cooling elements are provided at the bottom of the annular cold-conducting plate, and distributed temperature sensors installed on the door mounting frame are provided between the multiple thermoelectric cooling elements. The pressure testing assembly includes two premixed tracer gas storage tanks and two pressure testing pipelines disposed in the detection base. The two pressure testing pipelines are respectively connected to the upper test chamber and the lower test chamber, and each pressure testing pipeline includes an inlet pipe and an outlet pipe.

[0005] Preferably, the liquid permeation channel is provided with an inlet pipe connected to the liquid pressurization module and a drain pipe connected to the external waste liquid pool at one end facing the air pressure test pipeline, and multiple permeation pipes are provided on the side of the liquid permeation channel facing the sealing door to be tested.

[0006] Preferably, the output end of the permeation tube is aligned with the gap of the sealing gasket in the sealed door to be tested.

[0007] Preferably, the inlet pipe is provided with a metering valve and an electrically controlled three-way valve facing outwards at its input end. The two input ends of the electrically controlled three-way valve are respectively connected to a pure nitrogen input pipe and a premixed gas input pipe. The pure nitrogen input pipe is connected to an external nitrogen source, and the premixed gas input pipe is connected to the output end of the premixed tracer gas storage tank.

[0008] Preferably, the output end of the gas outlet pipe is provided with an electrically controlled single-way valve and a detection extraction pipe in sequence, and the detection extraction pipe is connected to the input end of an external helium mass spectrometer.

[0009] Preferably, a heat dissipation substrate with multiple matching thermoelectric cooling chips is installed at the bottom of the mounting groove, and heat dissipation fins are provided below the heat dissipation substrate, which are located in the lower test cavity.

[0010] Preferably, the size of the annular cold-conducting plate matches the sealing gasket, and a heat-insulating pad is provided between the bottom surface of the annular cold-conducting plate and the upper surface of the mounting groove.

[0011] Preferably, a plurality of thermoelectric cooling elements are evenly arranged in an array and installed at the bottom of the mounting groove, with the cold end of the thermoelectric cooling element in close contact with the annular cold-conducting plate and the hot end of the thermoelectric cooling element in close contact with the heat dissipation substrate.

[0012] Preferably, the gas filled in the premixed tracer gas storage tank is a premixed gas of helium and nitrogen, wherein the volume concentration of helium is 20%.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the synergistic effect of a permeation tube, annular cooling plate, and thermoelectric cooling element to actively and controllably transport liquid to the sealed gap and rapidly freeze it. This overcomes the limitations of existing testing methods (such as overall spraying and static water pressure) which can only assess macroscopic water tightness but cannot actively create and study the microscopic ice seepage failure mechanism, thus simulating the water seepage and freezing conditions of ship sealing doors in polar environments.

[0014] 2. By setting up independent upper and lower test chambers, and cooperating with a gas pressure test pipeline that can flexibly switch between pure nitrogen and helium-nitrogen mixture by an electrically controlled three-way valve, the invention can detect two working conditions in a single clamping operation: leakage from inside the door to outside the cabin and pressure from outside the cabin to inside the door, by changing the gas medium and pressure of the two chambers respectively. Attached Figure Description

[0015] Figure 1 This is a front structural schematic diagram of a ship sealing door internal and external pressure testing system proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of a ship sealing door internal and external pressure testing system proposed in this invention; Figure 3 This is a cross-sectional view of the test chamber in a ship sealing door internal and external pressure testing system proposed in this invention; Figure 4 This is a structural assembly diagram of the test chamber and the sealed door to be tested in a ship sealing door internal and external pressure testing system proposed in this invention; Figure 5 This is a schematic diagram of the overall structure of the door mounting frame in the internal and external pressure testing system for a ship's sealed door proposed in this invention; Figure 6 This is a structural assembly diagram of the door mounting frame in a ship sealing door internal and external pressure testing system proposed in this invention; Figure 7 This is a structural cross-sectional view of the door mounting frame in a ship sealing door internal and external pressure testing system proposed in this invention; Figure 8 This is a schematic diagram of the back structure of a ship sealing door internal and external pressure testing system proposed in this invention.

[0016] In the diagram: 1. Detection base; 2. Liquid pressurization module; 3. Test chamber; 301. Upper test chamber; 302. Lower test chamber; 4. Mounting partition; 5. Door mounting frame; 501. Mounting groove; 6. Liquid permeation channel; 7. Annular cooling plate; 8. Thermoelectric cooling element; 9. Distributed temperature sensor; 10. Premixed tracer gas storage tank; 11. Inlet pipe; 12. Outlet pipe; 13. Water inlet pipe; 14. Drain pipe; 15. Permeation pipe; 16. Metering valve; 17. Electrically controlled three-way valve; 18. Pure nitrogen input pipe; 19. Premixed gas input pipe; 20. Detection extraction pipe; 21. Heat dissipation base plate; 22. Insulation pad; 23. Sealed door to be tested. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Example, refer to Figures 1 to 8 A ship sealing door internal and external pressure testing system includes a test base 1 for testing the sealing door 23 to be tested. The test base 1 is equipped with a liquid pressurization module 2 for providing an adjustable pressure and flow rate liquid source for the entire test. The test base 1 is equipped with a test assembly, which includes a test chamber 3. The top of the test chamber 3 is equipped with a hatch cover. The test chamber 3 is equipped with an installation partition 4. The inner side of the installation partition 4 is equipped with a through hole. The inner side wall of the through hole is equipped with a permeation component. The upper test chamber 301 is formed above the installation partition 4, and the lower test chamber 302 is formed below the installation partition 4. The outer side walls of the upper test chamber 301 and the lower test chamber 302 are equipped with air pressure testing components. The permeation assembly includes a door mounting frame 5, on the upper surface of which a sealed door 23 to be tested is placed. The interior of the door mounting frame 5 is provided with a liquid permeation channel 6. The surface of the door mounting frame 5 is provided with a mounting groove 501. An annular cooling plate 7 is installed in the mounting groove 501. Multiple thermoelectric cooling elements 8 are provided at the bottom of the annular cooling plate 7. Distributed temperature sensors 9 are installed on the door mounting frame 5 between the multiple thermoelectric cooling elements 8. The distributed temperature sensors 9 are used to monitor the temperature of the surface and gap microenvironment of the annular cooling plate 7 in real time and feed the data back to the control system. The thermoelectric cooling elements 8 are used to receive instructions from the control system and precisely cool the annular cooling plate 7 to simulate a low temperature condition below freezing point in the contact area of ​​the sealing gasket. The air pressure testing assembly includes two premixed tracer gas storage tanks 10 disposed in the detection base 1 and two air pressure testing pipelines. The two air pressure testing pipelines are respectively connected to the upper test chamber 301 and the lower test chamber 302. The air pressure testing pipelines include an inlet pipe 11 and an outlet pipe 12.

[0021] Furthermore, the liquid permeation channel 6 is provided with an inlet pipe 13 connected to the liquid pressurization module 2 and a drain pipe 14 connected to the external waste liquid pool at one end facing the air pressure test pipeline. The liquid permeation channel 6 is provided with multiple permeation pipes 15 on the side facing the sealing door 23 to be tested. The output end of the permeation pipe 15 is aligned with the gap of the sealing gasket in the sealing door 23 to be tested. The further advantage of the above is that the test liquid can be directly delivered and applied to the contact gap between the sealing gasket and the door frame in a controllable manner through the permeation channel and permeation pipe 15 to simulate the process of seawater seeping in through micro-leakage channels in polar environments. This process can be accelerated by increasing the pressure through the liquid pressurization module 2, overcoming the limitations of traditional watertight tests, which can only perform overall spraying or static water pressure assessment and cannot specifically study the micro-seepage mechanism and the impact of initial ice damage.

[0022] Furthermore, the inlet pipe 11 is provided with a metering valve 16 and an electrically controlled three-way valve 17 facing outwards. The two inlet ends of the electrically controlled three-way valve 17 are respectively connected to a pure nitrogen inlet pipe 18 and a premixed gas inlet pipe 19. The electrically controlled three-way valve 17 can switch the type of gas entering the upper test chamber 301 or the lower test chamber 302 when performing different test stages. The metering valve 16 can measure the gas flow rate entering the test chamber, thereby supporting the control system to control the rate and magnitude of pressure change in the chamber. The pure nitrogen inlet pipe 18 is connected to an external nitrogen source to provide pure nitrogen for purging the system or establishing a base pressure before testing. The premixed gas inlet pipe 19 is connected to the output end of the premixed tracer gas storage tank 10 for high-sensitivity sealing detection. The further advantage of the above is that by controlling the switching of gas types through the electronically controlled three-way valve 17, and in conjunction with the independent gas paths of the upper test chamber 301 and the lower test chamber 302, the gas medium on both sides of the sealing door 23 to be tested can be flexibly configured. For example, the inner side of the door (lower test chamber 302) can be filled with tracer mixed gas and the outer side (upper test chamber 301) can be filled with nitrogen to establish a pressure difference, thereby testing the sealing performance from the inside to the outside of the door. Conversely, the sealing performance from the outside to the inside of the door can be tested, realizing independent quantitative detection of the bidirectional sealing performance of the ship's sealing door. Furthermore, the output end of the gas outlet pipe 12 is sequentially equipped with an electrically controlled single-way valve and a detection extraction pipe 20. The detection extraction pipe 20 is connected to the input end of an external helium mass spectrometer. After the leak detection process is completed, the sample gas flow that may contain tracer gas in the corresponding test area (upper test chamber 301 or lower test chamber 302) is directionally transported to the external helium mass spectrometer for analysis. Furthermore, a plurality of heat dissipation substrates 21 matching thermoelectric cooling chips 8 are installed at the bottom of the mounting slot 501. Heat dissipation fins are provided below the heat dissipation substrates 21, and the heat dissipation fins are located in the lower test cavity 302. Furthermore, the size of the annular cooling plate 7 matches the sealing gasket to ensure that its cooling effect can completely cover and act on the entire contact loop of the sealing gasket. A heat insulation pad 22 is provided between the bottom surface of the annular cooling plate 7 and the upper surface of the mounting groove 501 to establish thermal resistance between the annular cooling plate 7 and the door mounting frame 5, minimizing the loss of cold energy to non-target areas and concentrating the cooling energy in the door gap area of ​​the sealed door 23 to be tested. Furthermore, multiple thermoelectric cooling elements 8 are evenly arranged in an array and installed at the bottom of the mounting groove 501, so that their cooling capacity can be evenly transferred to the entire annular cooling plate 7, avoiding local temperature differences. The cold end of the thermoelectric cooling element 8 is in close contact with the annular cooling plate 7, realizing efficient cooling capacity conduction from the cold end of the thermoelectric cooling element 8 to the annular cooling plate 7. The hot end of the thermoelectric cooling element 8 is in close contact with the heat dissipation substrate 21, and the heat generated by it is quickly dissipated by the heat dissipation substrate 21. Furthermore, the gas filled in the premixed tracer gas storage tank 10 is a premixed gas of helium and nitrogen, with a helium volume concentration of 20%, which is used as a tracer medium for high-sensitivity leak detection. Helium is used to identify minute leaks by leveraging its small molecular weight and strong permeability. While ensuring that the helium gas spectrometer leak detector can achieve high detection sensitivity sufficient to detect micro-leaks, it can reduce the gas cost and resource consumption of a single test compared to using pure helium. At the same time, the fixed proportion of premixed gas cylinders can also ensure the consistency of each test.

[0023] When using this invention, the sealed door 23 to be tested is placed face up on the door mounting frame 5 and locked, and then the cover is installed to create a sealed environment inside the test chamber 3. When simulating the infiltration freezing condition, the control system activates the liquid pressurization module 2 and the thermoelectric cooling element 8. The liquid pressurization module 2 pumps the test liquid into the liquid infiltration channel 6 through the water inlet pipe 13, and finally delivers it to the contact gap of the sealing gasket through multiple infiltration pipes 15 in a controllable manner to simulate seawater infiltration. At the same time, the distributed temperature sensor 9 monitors the temperature in real time, and the control system adjusts the power of multiple thermoelectric cooling elements 8 accordingly to make the surface of the annular cold conduction plate 7 drop to a set temperature far below the freezing point, ensuring that the liquid infiltrating the gap freezes quickly, thereby reproducing the complete physical process of water seepage and freezing in the door gap in the polar environment in the laboratory. After the icing condition is established, an airtightness test is performed. The operator or the central controller selects the test mode through the program. The control system can flexibly configure the gas medium and pressure on both sides of the sealing door by controlling the electric three-way valve 17 and the metering valve 16. Taking the test of the sealing performance of the sealing door 23 from the inside to the outside as an example: In the pressure testing pipeline connected to the lower test chamber 302, the electrically controlled three-way valve 17 switches to connect the premixed gas input pipe 19, allowing the lower test chamber 302 to be filled with a helium-nitrogen mixture from the premixed tracer gas storage tank 10. Simultaneously, in the pressure testing pipeline connected to the upper test chamber 301, the electrically controlled three-way valve 17 switches to connect the pure nitrogen input pipe 18, filling the upper test chamber 301 with pure nitrogen. Through the coordinated control of the two metering valves 16, a stable or pressurized pressure can be established and maintained on both sides of the valve. The system simulates a static pressure environment or a dynamic pressure profile (simulating the dynamic pressure fluctuations on both sides of the sealed door 23 under test during a storm). After a certain period of time, the system stops cooling and pressurizing, opens the drain pipe 14 to discharge the residual liquid, and opens the detection suction pipe 20 to sample the side cavity that is not filled with mixed gas (in this example, the upper test cavity 301). Subsequently, an external helium mass spectrometer is used for analysis. If helium is detected, it indicates that there is a leak from the inside of the door to the outside. Similarly, if it is necessary to test the sealing performance of the door from the outside to the inside, it is only necessary to exchange the gas configuration of the two chambers through the electrically controlled three-way valve 17 (i.e., the upper test chamber 301 is filled with mixed gas and the lower test chamber 302 is filled with nitrogen gas), and repeat the above pressure establishment and testing steps. After all tests are completed, the system automatically executes a reset procedure, stops the operation of the thermoelectric cooler 8, closes all gas valves, opens the drain pipe 14 and corresponding valves of the liquid permeation channel 6 to drain the residual liquid, and then uses the pure nitrogen input pipe 18 to inject nitrogen into the test chamber for purging to ensure that there is no residual tracer gas and moisture in the chamber. Finally, the pressure is released to atmospheric pressure, and the operator can safely open the chamber cover and take out the sealed door 23 to be tested.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A system for testing the internal and external pressure of a ship's sealed door, comprising a testing base (1) for testing the sealed door (23) under test, characterized in that, The detection base (1) is provided with a liquid pressurization module (2), and the detection base (1) is provided with a test assembly. The test assembly includes a test chamber (3), the top of the test chamber (3) is provided with a cover, the test chamber (3) is provided with an installation partition (4), the inner side of the installation partition (4) is provided with a through hole, the inner side wall of the through hole is provided with a permeation component, the upper test chamber (301) is formed above the installation partition (4), the lower test chamber (302) is formed below the installation partition (4), and the outer side walls of the upper test chamber (301) and the lower test chamber (302) are both provided with a gas pressure test component. The permeation assembly includes a door mounting frame (5), on the upper surface of the door mounting frame (5) is a sealing door (23) to be tested, the inside of the door mounting frame (5) is provided with a liquid permeation channel (6), the surface of the door mounting frame (5) is provided with a mounting groove (501), an annular cold conducting plate (7) is installed in the mounting groove (501), the bottom of the annular cold conducting plate (7) is provided with a plurality of thermoelectric cooling chips (8), and a distributed temperature sensor (9) installed on the door mounting frame (5) is provided between the plurality of thermoelectric cooling chips (8). The pressure testing assembly includes two premixed tracer gas storage tanks (10) disposed in the detection base (1) and two pressure testing pipelines. The two pressure testing pipelines are respectively connected to the upper test chamber (301) and the lower test chamber (302). The pressure testing pipelines include an inlet pipe (11) and an outlet pipe (12).

2. The ship sealing door internal and external pressure testing system according to claim 1, characterized in that, The liquid permeation channel (6) is provided with an inlet pipe (13) connected to the liquid pressurization module (2) and a drain pipe (14) connected to the external waste liquid pool at one end facing the air pressure test pipeline. The liquid permeation channel (6) is provided with multiple permeation pipes (15) on the side facing the sealing door (23) to be tested.

3. The ship sealing door internal and external pressure testing system according to claim 2, characterized in that, The output end of the permeation tube (15) is aligned with the gap of the sealing gasket in the sealing door (23) to be tested.

4. The ship sealing door internal and external pressure testing system according to claim 1, characterized in that, The inlet pipe (11) is provided with a metering valve (16) and an electrically controlled three-way valve (17) facing outwards. The two inlet ends of the electrically controlled three-way valve (17) are respectively connected to a pure nitrogen inlet pipe (18) and a premixed gas inlet pipe (19). The pure nitrogen inlet pipe (18) is connected to an external nitrogen source, and the premixed gas inlet pipe (19) is connected to the output end of the premixed tracer gas storage tank (10).

5. The ship sealing door internal and external pressure testing system according to claim 1, characterized in that, The output end of the gas outlet pipe (12) is provided with an electrically controlled single-way valve and a detection gas extraction pipe (20) in sequence. The detection gas extraction pipe (20) is connected to the input end of an external helium mass spectrometer.

6. The ship sealing door internal and external pressure testing system according to claim 1, characterized in that, The bottom of the mounting slot (501) is equipped with a heat dissipation substrate (21) with multiple matching thermoelectric cooling chips (8). The heat dissipation substrate (21) is provided with heat dissipation fins below it, and the heat dissipation fins are located in the lower test cavity (302).

7. The ship sealing door internal and external pressure testing system according to claim 6, characterized in that, The size of the annular cooling plate (7) matches the sealing gasket, and a heat insulation pad (22) is provided between the bottom surface of the annular cooling plate (7) and the upper surface of the mounting groove (501).

8. The ship sealing door internal and external pressure testing system according to claim 7, characterized in that, Multiple thermoelectric cooling chips (8) are evenly arranged in an array and installed at the bottom of the mounting groove (501). The cold end of the thermoelectric cooling chip (8) is in close contact with the annular cold-conducting plate (7), and the hot end of the thermoelectric cooling chip (8) is in close contact with the heat dissipation substrate (21).

9. A ship sealing door internal and external pressure testing system according to claim 1, characterized in that, The gas filled in the premixed tracer gas storage tank (10) is a premixed gas of helium and nitrogen, wherein the volume concentration of helium is 20%.

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