Device for detecting sealing performance of rapid drainage device and detection method

Abstract

The invention discloses a device for detecting the sealing performance of a rapid drainage device and a detection method, and the device comprises a bearing box body and an airtight test assembly. The device is small in size and light in weight, the bottom of the device can be fixed on various operation platforms with different thicknesses, the adaptability is good, the installation is simple and convenient, and the air tightness of the airflow in two directions can be detected by controlling the air flowing direction without reversing. And the sealing performance verification work of the rapid drainage joint can be rapidly carried out in batches.

Description

Technical Field

[0001] The present invention relates to the technical field of general commuter aircraft, and in particular to a device and a method for detecting the sealing performance of a quick drainage device. Background Art

[0002] The fuel system of an amphibious aircraft must be capable of both land and water takeoff and landing. During water operations, water cannot be drained from the fuel tank through the bottom drain valve, requiring rapid drainage from the tank's upper skin. Therefore, the aircraft's rapid drain valve must be inspected for leaks under both positive and negative pressure differentials. This means ensuring no fuel leakage under positive pressure and no water infiltration under negative pressure.

[0003] Quick drain valves are connected by quick connectors and are frequently used. To ensure safe use on aircraft, quality control is crucial. Therefore, these components undergo a seal test to ensure conduction only when the two quick connectors are connected. A single quick connector is leak-free in both forward and reverse directions.

[0004] Aircraft have multiple quick drain valves. Testing each valve individually would require multiple acceptance tests, a significant workload, and repeated disassembly and assembly. For pressure testing of leaks, the fuel tank is cramped and limited in scope. Any defective valves detected would need to be replaced, impacting workflow and efficiency. After the forward flow test, reverse testing requires an external catheter for reverse ventilation, making leak detection less obvious.

[0005] If the quick drain valve is tested on the ground before installation, the disassembly, installation and testing of multiple quick connectors can be completed quickly in batches, and qualified products can be selected for upper machine installation. This application proposes a solution to this demand. Summary of the Invention

[0006] Purpose of the invention: The purpose of the present invention is to provide a device and a detection method for detecting the sealing of a quick drainage device, which can detect the sealing of the quick connector before installation, and at the same time can improve the detection speed and adapt to the detection process of quick connectors of various specifications.

[0007] Technical solution: The device for testing the sealing performance of a quick drain device according to the present invention includes a carrying box and an airtightness test assembly. The carrying box includes an upper shell and a lower shell that are sealed together. The interior of the lower shell is provided with a groove for carrying a quick connector. The bottom of the groove communicates with the internal cavity of the lower shell. The bottom of the upper shell is provided with a protrusion that extends into the groove. The protrusion is provided with a channel for accommodating the quick connector. The top of the channel is provided with an upper cover plate for pressing the quick connector.

[0008] The airtight test assembly includes an air source, two three-way valves and four shut-off valves. The air source is respectively connected to the two three-way valves, and a shut-off valve is arranged between the air source and the three-way valve. The two three-way valves are respectively connected to the internal cavity of the lower shell and the cavity between the top of the quick connector and the upper cover plate. The two three-way valves are also respectively connected to an external water pool, and a shut-off valve is arranged between the external water pool and the three-way valve.

[0009] Preferably, the upper shell and the lower shell are sealed and connected via a quick clamp, and the quick clamps include two, which are respectively disposed on opposite sides of the upper shell and the lower shell.

[0010] The quick clamp completes the fixation between the upper shell and the lower shell and the clamping of the quick connector. At the same time, the pressure between the upper shell and the lower shell by the quick clamp is pressed tightly to form the first seal.

[0011] Preferably, the groove inside the lower shell matches the protrusion at the bottom of the upper shell, and a rubber sealing ring is provided between the outer periphery of the protrusion and the inner wall of the groove.

[0012] The setting of the rubber sealing ring forms a second seal between the upper shell and the lower shell, further improving the sealing and avoiding the problem of inaccurate testing caused by leakage of the device itself.

[0013] Preferably, a detection hole is provided on the inner wall of the groove in the lower shell, and the detection hole is connected to the external pipeline and then connected to the external water pool. The height of the detection hole is lower than the height of the rubber sealing ring.

[0014] The detection hole is set to test the sealing of the device itself before testing the quick connector to prevent inaccurate testing due to leakage of the device itself.

[0015] Preferably, an O-type sealing ring is provided between the top outer wall of the quick connector and the inner wall of the channel in the protrusion, and an O-type sealing ring is provided between the bottom outer wall of the quick connector and the inner wall of the groove.

[0016] The O-rings at the top and bottom of the quick connector further improve the sealing of the device during the detection process.

[0017] Preferably, an upper cover plate seal is provided between the bottom of the upper cover plate and the top of the quick connector, an opening is provided on the upper cover plate, and the top air port of the quick connector is connected to the three-way valve through the opening.

[0018] Preferably, an opening is provided on the side wall of the lower shell, one end of the opening is connected to the cavity inside the lower shell, and the other end is connected to the three-way valve through a pipeline.

[0019] Preferably, the groove and the channel in the protrusion are reserved with a telescopic and pressing stroke of the quick connector.

[0020] The reserved telescopic compression formation can make the device suitable for sealing detection of quick connectors of various specifications.

[0021] A method for detecting the sealing performance of a rapid drainage device, characterized in that it specifically comprises the following steps:

[0022] S1: Fix the upper cover to the channel at the top of the upper shell with fasteners. After sealing the channel, place the quick connector in the groove of the lower shell. Lower the channel in the protrusion of the upper shell along the axial direction of the quick connector until the lower end surface of the upper shell is in contact with the upper end surface of the lower shell.

[0023] S2: Use the quick clamp to clamp the upper shell and the lower shell. At this time, the upper cover plate in the upper shell presses the upper end surface of the quick connector synchronously;

[0024] S3: Connect the air source, open only one shut-off valve between the three-way valve and the air source, and keep the other three shut-off valves closed. Check whether there are bubbles in the pipe connected to the water tank at the detection hole on the lower shell, and judge the sealing of the carrying box. If the sealing of the carrying box is normal, proceed to the next step.

[0025] S4: Connect the air source, control the opening and closing of the four shut-off valves, and test the sealing performance of the quick connector in which the air flow enters from the top air port of the quick connector and is discharged from the bottom air port of the quick connector.

[0026] S5: After completing the current quick connector inspection, loosen the upper and lower housings using the quick clamp, remove the current quick connector, insert the next quick connector, and repeat steps S1-S4 to enter the next round of inspection.

[0027] Preferably, the gas source is connected to S3 and S4, and when the gas is ventilated to the carrying box, the pressure of the gas is controlled within 0.5 bar.

[0028] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0029] 1. The device of the present invention is small in size, light in weight, and its bottom can be fixed on a variety of operating platforms of different thicknesses, with good adaptability and easy installation;

[0030] 2. The device of the present invention has good sealing performance. It has multiple sealing methods: including the seal between the upper and lower shells clamped by a quick clamp, the rubber sealing ring between the upper and lower shells, the upper cover plate seal, and the O-ring seal of the quick connector. The internal cavity also has a leakage self-detection function. These multiple methods ensure the good sealing performance of the detection device itself, avoiding the impact of leakage on the test results due to the test device itself.

[0031] 3. The present invention can quickly and batch-wise verify the sealing performance of quick drain joints by controlling the air flow direction without the need for reversing.

[0032] 4. The present invention is adaptable to various types of quick connectors. The quick clamp can be used to achieve repeated disassembly and assembly. Testing can be carried out on the ground, avoiding the inconvenience of operation caused by the narrow space on the aircraft.

[0033] 5. The test method of the present invention can clearly observe the experimental results. The bubbles in the water can be used to visually determine whether the quick connector is leak-tight. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the carrying box in the present invention.

[0035] Figure 2 It is a front view of the upper shell portion of the bearing box in the present invention.

[0036] Figure 3 It is a three-dimensional diagram of the lower shell part of the bearing box in the present invention.

[0037] Figure 4 It is a cross-sectional view of the carrying box in the present invention.

[0038] Figure 5 It is a structural schematic diagram of the present invention.

[0039] Figure 6 Schematic diagram of the detection method of the present invention. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0041] See attached Figures 1-2 The figure is a schematic structural diagram of the present invention, which includes a load-bearing box and an airtight test assembly, wherein the load-bearing box includes an upper shell 1 and a lower shell 2 that are sealed and connected, and a groove 4 for carrying a quick connector 3 is provided inside the lower shell 1, and the bottom of the groove 4 is connected to the internal cavity of the lower shell 2; a protrusion 5 extending into the groove 4 is provided at the bottom of the upper shell 1, and a channel for accommodating the quick connector is provided in the protrusion 5, and an upper cover plate 6 for pressing the quick connector is provided on the top of the channel.

[0042] The airtight test assembly includes an air source 7, a first three-way valve 8, a second three-way valve 9, a first shut-off valve 10, a second shut-off valve 11, a third shut-off valve 12 and a fourth shut-off valve 13. The air source 7 is connected to the first three-way valve 8 and the second three-way valve 9 respectively. The first shut-off valve 10 and the third shut-off valve 12 are respectively arranged between the air source 7 and the first three-way valve 8 and between the air source 7 and the second three-way valve 9. The first three-way valve 8 is also connected to the second shut-off valve 11 and the cavity between the top of the quick connector 13 and the upper cover plate 6 respectively. The second three-way valve 9 is also connected to the fourth shut-off valve 13 and the internal cavity of the lower shell 2 respectively. The second shut-off valve 11 and the fourth shut-off valve 13 are also connected to an external water pool.

[0043] In this embodiment, the upper shell 1 and the lower shell 2 are sealed and connected by a quick clamp 14. The quick clamp 14 includes two, which are respectively arranged on both sides of the upper shell 1 and the lower shell 2. The quick clamp 14 completes the fixation between the upper shell 1 and the lower shell 2 and the clamping of the quick connector 3. At the same time, the pressure between the upper shell 1 and the lower shell 2 by the quick clamp 14 is pressed tightly to form a first seal.

[0044] In this embodiment, the groove 4 inside the lower shell 2 matches the protrusion 5 at the bottom of the upper shell 1, and a rubber sealing ring 15 is provided between the outer periphery of the protrusion 5 and the inner wall of the groove 4. The setting of the rubber sealing ring 15 forms a second seal between the upper shell 1 and the lower shell 2, further improving the sealing performance and avoiding the problem of inaccurate testing caused by leakage of the device itself.

[0045] In this embodiment, a detection hole 16 is provided on the inner wall of the groove 4 in the lower shell 2. The detection hole 16 is connected to the external pipeline and then connected to the external water pool. The height of the detection hole 16 is lower than the height of the rubber sealing ring 15. The setting of the detection hole 16 is used to perform a sealing test on the device itself before testing the quick connector 3 to prevent inaccurate detection caused by leakage of the device itself.

[0046] In this embodiment, an O-ring 17 is provided between the top outer wall of the quick connector 3 and the inner wall of the channel in the protrusion 5, and an O-ring 17 is provided between the bottom outer wall of the quick connector 3 and the inner wall of the groove 4. The O-rings 17 at the top and bottom of the quick connector 3 further improve the sealing performance of the device during the detection process.

[0047] In this embodiment, an upper cover plate seal is provided between the bottom of the upper cover plate 6 and the top of the quick connector 3. An opening is provided on the upper cover plate 6. The top air port of the quick connector 3 is connected to the first three-way valve 8 through the opening. The opening is provided to connect the top air port of the quick connector 3 with the air source 7.

[0048] In this embodiment, an opening 18 is provided on the side wall of the lower shell 2, one end of the opening 18 is connected to the cavity inside the lower shell 2, and the other end is connected to the second three-way valve 9 through a pipeline. The setting of the opening 18 is used to connect the internal cavity of the lower shell 2 with the gas source 7.

[0049] In this embodiment, the channels in the groove 4 and the protrusion 5 are reserved with a telescopic and pressing stroke of the quick connector. The reserved telescopic and pressing stroke can make the device applicable to the sealing detection of quick connectors 3 of various specifications.

[0050] The specific steps of this device during the detection process are as follows:

[0051] S1: Fix the upper cover 6 to the channel at the top of the upper shell 1 with fasteners. After sealing the channel, place the quick connector 3 in the groove 4 of the lower shell 2. After the quick connector 3 is placed in the groove 4 of the lower shell 2, lower the channel in the protrusion 5 in the upper shell 1 along the axial direction of the quick connector 3 until the lower end surface of the upper shell 1 is in contact with the upper end surface of the lower shell 2.

[0052] S2: Clamp the upper shell 1 and the lower shell 2 with the quick clamp 14. At this time, the upper cover 6 in the upper shell 1 simultaneously presses the upper end surface of the quick connector 3;

[0053] S3: Connect the air source 7, open the first shut-off valve 10, keep the second shut-off valve 11, the third shut-off valve 12 and the fourth shut-off valve 13 closed, and check whether there are bubbles in the pipe connected to the water tank at the detection hole 16 on the lower shell 2. If no bubbles are generated, the sealing of the carrying box is normal, and the next step is to test the sealing of the quick connector 3;

[0054] S4: Connect the air source 7, open the first shut-off valve 10 and the fourth shut-off valve 13, close the second shut-off valve 11 and the third shut-off valve 12, detect the airflow entering from the top air port of the quick connector 3 and discharging the air from the bottom air port of the quick connector 3 to the sealing of the quick connector 3 of this passage. If no bubbles are generated in the water pool connected to the fourth shut-off valve 13, the forward air tightness of the quick connector 3 is good. Then slowly release the pressure, open the second shut-off valve 11 and the third shut-off valve 12, close the first shut-off valve 10 and the fourth shut-off valve 13, detect the airflow entering from the bottom air port of the quick connector 3 and discharging the air from the top air port of the quick connector 3 to the sealing of the quick connector of this passage. If no bubbles are generated in the water pool connected to the second shut-off valve 11, the reverse air tightness of the quick connector 3 is good.

[0055] S5: After completing the inspection of the current quick connector 3, loosen the upper shell 1 and the lower shell 2 through the quick clamp 14, take out the current quick connector 3, put in the next quick connector 3, repeat steps S1-S4, and enter the next round of inspection.

[0056] It is worth noting that when the gas source 7 is connected in S3-S4 and the air is ventilated to the carrying box, the gas pressure needs to be controlled within 0.5 bar. If the air pressure inside the placement device is too high, it will cause damage to the device itself.

Claims

1. A device for detecting the sealing performance of a quick drain device, comprising a bearing box and an airtight test assembly, wherein the bearing box comprises an upper shell (1) and a lower shell (2) which are sealed and connected, wherein a groove (4) for bearing a quick connector (3) is provided inside the lower shell (1), wherein the bottom of the groove (4) is connected to the inner cavity of the lower shell (2), wherein a convex block (5) extending into the groove (4) is provided at the bottom of the upper shell (1), wherein a channel for accommodating the quick connector (3) is provided in the convex block (5), and an upper cover plate (6) for pressing the quick connector (3) is provided at the top of the channel; The airtight test assembly comprises an air source (7), two three-way valves and four shut-off valves, wherein the air source (7) is respectively connected to the two three-way valves, and a shut-off valve is arranged between the air source (7) and the three-way valves, and the two three-way valves are respectively connected to the internal cavity of the lower shell (2) and the cavity between the top of the quick connector (3) and the upper cover plate (6), and the two three-way valves are also respectively connected to an external water pool, and a shut-off valve is arranged between the external water pool and the three-way valves.

2. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are sealed and connected via a quick clamp (14). The quick clamp (14) comprises two pieces, which are respectively disposed on opposite sides of the upper shell (1) and the lower shell (2).

3. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: The groove (4) inside the lower shell (2) matches the convex block (5) at the bottom of the upper shell (1), and a rubber sealing ring (15) is provided between the outer periphery of the convex block (5) and the inner wall of the groove (4).

4. The device for detecting the sealing performance of a rapid drainage device according to claim 3, characterized in that: A detection hole (16) is provided on the inner wall of the groove (4) in the lower shell (2). The detection hole (16) is connected to an external pipeline and then connected to an external water pool. The height of the detection hole (16) is lower than the height of the rubber sealing ring (15).

5. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: An O-type sealing ring (17) is provided between the top outer wall of the quick connector (3) and the inner wall of the channel in the protrusion (5), and an O-type sealing ring (17) is provided between the bottom outer wall of the quick connector (3) and the inner wall of the groove (4).

6. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: An upper cover seal is provided between the bottom of the upper cover (6) and the top of the quick connector (3). An opening is provided on the upper cover (6), and the top air port of the quick connector (3) is connected to the three-way valve through the opening.

7. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: An opening (18) is provided on the side wall of the lower shell (2), one end of the opening (18) is connected to the cavity inside the lower shell (2), and the other end is connected to the three-way valve through a pipeline.

8. The device for detecting the sealing performance of a rapid drainage device according to claim 1, characterized in that: The channels in the groove (4) and the protrusion (5) are reserved with a telescopic and pressing stroke of the quick connector (3).

9. A method for detecting the sealing performance of a rapid drainage device, characterized in that: The specific steps include: S1: Fix the upper cover (6) to the channel at the top of the upper shell (1) by means of fasteners. After sealing the channel, place the quick connector (3) in the groove (4) of the lower shell (2). Lower the channel in the protrusion (5) in the upper shell (1) along the axial direction of the quick connector (3) until the lower end surface of the upper shell (1) is in contact with the upper end surface of the lower shell (2). S2: Clamp the upper shell (1) and the lower shell (2) using a quick clamp (14), and at this time, the upper cover (6) in the upper shell (1) simultaneously presses the upper end surface of the quick connector (3); S3: Connect the air source (7), open only one shut-off valve between the three-way valve and the air source (7), and keep the other three shut-off valves closed. Detect whether bubbles are generated in the pipe connected to the water pool at the detection hole (16) on the lower shell (2), and judge the sealing of the bearing box. If the sealing of the bearing box is normal, proceed to the next step. S4: connecting the air source (7), controlling the opening and closing of the four shut-off valves, and detecting the sealing performance of the quick connector (3) in which the air flow enters from the top air port of the quick connector (3) and is discharged from the bottom air port of the quick connector (3); and detecting the sealing performance of the quick connector (3) in which the air flow enters from the bottom air port of the quick connector (3) and is discharged from the top air port of the quick connector (3); S5: After completing the current quick connector test, loosen the upper shell (1) and the lower shell (2) through the quick clamp (14), take out the current quick connector (3), put in the next quick connector (3), repeat S1-S4 steps, and enter the next round of testing.

10. The method for detecting the sealing performance of a rapid drainage device according to claim 8, characterized in that: The gas source (7) is connected to S3 and S4 to control the gas pressure within 0.5 bar when the gas is ventilated to the carrying box.

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