A high-efficiency pressurizing device for large integral oil tanks with internal pressure feedback

Abstract

This invention relates to a high-efficiency pressurization device for a large integral fuel tank with internal pressure feedback, belonging to the field of aerospace component sealing and testing technology. It includes a detachable fixture, a ball screw, an angle sensor, an inflation port, and nuts one, two, and three. The ball screw passes through the detachable fixture and through the angle sensor, which is fixed via a sealing joint. Nut one is threaded onto the ball screw. Nut two and nut three are welded to both sides of nut one. A pressure sensor is installed at the bottom of nut two, and a temperature sensor is installed at the bottom of nut three. An inflation port is provided through the detachable fixture. This invention places the pressure and temperature sensors of the detachable fixture inside the fuel tank via a ball screw mechanism, allowing the sensors to move freely along the inflation direction. Simultaneously, it can combine the angle sensor to calculate and monitor the sensor depth in real time, improving the efficiency and reliability of airtightness testing of large integral fuel tanks and ensuring the sealing quality of large integral fuel tanks.

Description

Technical Field

[0001] This invention relates to the field of sealing and testing technology for aerospace components, specifically to a high-efficiency pressurization device for a large integral fuel tank with internal pressure feedback. Background Technology

[0002] After the assembly of a large integral aircraft fuel tank is completed, its overall airtightness needs to be tested. The existing airtightness testing process involves filling the tank with nitrogen or compressed air, balancing it after the pressure reaches a set value, and then disconnecting the air supply once the pressure stabilizes at the set value. A pressure holding test is then conducted, and the overall airtightness of the tank is determined by observing whether there is a pressure drop after holding the pressure for a certain period. The airtightness testing process for large integral aircraft fuel tanks has established different test standards for test pressure, pressure holding time, etc., depending on the size of the tank being tested.

[0003] Aircraft integral fuel tanks are large in size, and the airtightness testing process is time-consuming. This time consumption mainly stems from the inflation time, balancing time, and pressure holding test time. The pressure holding test time is generally limited by process requirements and cannot be optimized or shortened. Existing airtightness testing inflation fixtures simply fix pressure sensors to the inflation plug, assuming the pressure at the inflation position is the internal overall pressure value. For large-sized aerospace sealing components like integral fuel tanks, on the one hand, during inflation, pressure changes within the tank are affected by spatial location and gas flow time, exhibiting a certain lag. The pressure data obtained by the sensor at the inflation port cannot represent the true average pressure of the gas medium after balancing within the tank, resulting in inaccurate pressure readings and pressure drops after balancing. On the other hand, a large inflation flow rate leads to unstable gas pressure within the tank, requiring a longer balancing time; conversely, a small flow rate results in a longer inflation time, leading to low testing efficiency.

[0004] Therefore, how to provide a high-efficiency pressurization device for a large integrated oil tank with internal pressure feedback has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address at least one technical problem in the background art, the present invention provides a high-efficiency pressurization device for a large integral oil tank with internal pressure feedback. The pressure sensor and temperature sensor of the separate tooling are set inside the oil tank through a ball screw mechanism, and the sensors can move freely along the inflation direction. At the same time, it can be combined with an angle sensor to calculate and monitor the sensor depth in real time, thereby improving the efficiency and reliability of airtightness detection of the large integral oil tank and ensuring the sealing quality of the large integral oil tank.

[0006] To achieve the above objectives, the present invention provides a high-efficiency pressurization device for a large integral oil tank with internal pressure feedback, comprising:

[0007] The assembly includes a detachable tooling, a ball screw, an angle sensor, an inflation port, and nuts one, two, and three. The ball screw passes through the detachable tooling. The upper portion of the ball screw passes through the angle sensor and is fixed by a sealing joint. The lower portion of the ball screw is threadedly connected to nut one. Nuts two and three are welded to both sides of nut one. A pressure sensor is installed at the bottom of nut two, and a temperature sensor is installed at the bottom of nut three. An inflation port is provided through the detachable tooling.

[0008] Furthermore, the detachable tooling includes an outer tooling cover and an inner tooling cover, which are fixedly connected by clamping bolts; and the outer tooling cover is provided with a U-shaped groove to avoid the ball screw and the inflation port.

[0009] Furthermore, an outer cover sealing gasket is adhered to the bottom of the outer cover of the tooling, and an inner cover sealing gasket is adhered to the top of the inner cover of the tooling.

[0010] Furthermore, the top and bottom of the inner cover of the tooling are fixed with mounting handles, and the outer cover of the tooling has slots to avoid the mounting handles.

[0011] Furthermore, the pressurization device is installed through the following steps:

[0012] Step S1: Rotate the ball screw to return it to zero;

[0013] Step S2: Turn on the power to the pressure sensor and temperature sensor, check the communication, and ensure that there are no abnormalities in the communication;

[0014] Step S3: Grab the installation handle and insert the tooling inner cover into the oil tank, making sure the inner cover sealing gasket is tightly against the inner surface of the oil tank. During the installation process, be careful of collisions between the ball screw and the inner and outer walls of the oil tank.

[0015] Step S4: Insert the outer cover of the tooling into the inner cover of the tooling using the clamping bolts and the installation handle, so that the outer cover of the tooling is installed on the outer surface of the oil tank and the sealing gasket of the outer cover is in close contact with the outer surface of the oil tank.

[0016] Step S5: Tighten the clamping bolts in sequence, and then tighten the ball screw sealing joint to complete the sealing of the inflation device;

[0017] Step S6: Connect the inflation connector to the air tightness test bench via the air inlet pipe;

[0018] Step S7: Rotate the rotating end of the ball screw mechanism to control nut one to drive nut two and nut three to move along the inflation direction, read the angle sensor data in real time, determine the nut displacement in real time through the lead, and determine the oil tank depth where the pressure sensor and temperature sensor are located.

[0019] Furthermore, the variable flow inflation method that minimizes inflation and equilibration time is as follows:

[0020] Step E1: When inflating with a constant flow rate φ, the inflation time is t and the inflation volume is V; the relationship between the inflation volume V, the inflation flow rate φ and the inflation time t is shown in equation (5);

[0021] V=φt (5)

[0022] When inflation reaches time t′, the flow valve starts to adjust the inflation flow rate from φ to 0 in a linearly decreasing inflation method. The adjusted inflation time is t1. At time t1, the large integral oil tank is filled with air. The relationship between the adjusted inflation volume V, the inflation flow rate φ and the inflation time t1 is shown in equation (6).

[0023] V=(t′+t1)φ / 2 (6)

[0024] The adjusted inflation time t1 is calculated by equations (5) and (6), and the inflation time t1 corresponding to different t′ is obtained, as shown in equation (7).

[0025] t1=2t-t′ (7)

[0026] Step E2: By conducting multiple air tightness tests with variable flow inflation, start recording the equilibrium time t2 at time t1 after inflation is completed, and obtain the equilibrium time t2 corresponding to different t′.

[0027] Step E3: By calculating and experimenting with the datasets of t′, t1 and t2, fit the mapping relationship between t′ and t1+t2, obtain the variable flow time t′ corresponding to the minimum inflation equilibrium time t1+t2, and calculate the gas pressure p′ corresponding to the variable flow time using equation (8);

[0028]

[0029] The beneficial effects of this invention are as follows:

[0030] 1. This invention designs a large integrated oil tank inflation device with internal pressure feedback. The pressure sensor and temperature sensor of the tooling are set inside the oil tank through a ball screw mechanism, which enables the sensor to move freely along the inflation direction. At the same time, it can be combined with an angle sensor to calculate and monitor the sensor depth in real time.

[0031] 2. This invention aims to shorten the inflation and balancing time. It proposes a variable flow inflation method that minimizes inflation and balancing time during the inflation stage of fuel tank airtightness testing. This method shortens the total inflation and balancing time in the airtightness testing process of large integral fuel tanks and improves the airtightness testing efficiency of large integral fuel tanks. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a curve showing the relationship between the flow rate change time and the inflation equilibrium time in this invention.

[0034] Among them, 1-tool outer cover, 2-tool inner cover, 3-outer cover sealing gasket, 4-inner cover sealing gasket, 5-pressure sensor, 6-temperature sensor, 7-installation handle, 8-clamping bolt, 9-inflation interface, 10-ball screw, 11-nut one, 12-nut two, 13-nut three, 14-angle sensor, 15-sealing joint. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0038] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0039] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0040] To address the problems existing in the current technology, it is necessary to consider the pressure differences within the large integral fuel tank caused by spatial differences during the inflation process, determine the optimal pressure detection position, accurately monitor the actual pressure value inside the fuel tank at the optimal pressure detection position during inflation, and adjust the inflation and pressurization strategy based on the accurately monitored gas pressure value to minimize inflation time and equilibration time, thereby achieving high-efficiency and high-reliability detection of the airtightness of the large integral fuel tank.

[0041] This invention designs a large-scale integrated oil tank inflation device with internal pressure feedback, and proposes a variable flow inflation and pressurization method that minimizes the total inflation balancing time. The variable flow time is calculated and variable flow inflation is performed when the corresponding pressure value is reached, thereby shortening the total inflation and balancing time and improving detection efficiency.

[0042] To achieve the above objectives, such as Figure 1 As shown, the present invention provides a high-efficiency pressurization device for a large integral oil tank with internal pressure feedback, comprising:

[0043] The assembly includes a detachable fixture, a ball screw 10, an angle sensor 14, an inflation port 9, a nut 11, a nut 12, and a nut 13. The ball screw 10 passes through the detachable fixture. The upper portion of the ball screw 10 passes through the angle sensor 14 and is fixed by a sealing joint 15. The lower portion of the ball screw 10 is threadedly connected to the nut 11. Nuts 12 and 13 are welded to both sides of nut 11. A pressure sensor 5 is installed at the bottom of nut 12, and a temperature sensor 6 is installed at the bottom of nut 13. The inflation port 9 passes through the detachable fixture. Nuts 11, 12, and 13 are of the same specification and welded at the same horizontal level, ensuring that the moving mechanism and the mounting surfaces of the pressure sensor 5 and temperature sensor 6 are at the same height inside the oil tank. Both the pressure sensor 5 and temperature sensor 6 use wireless transmission, avoiding complex internal wiring that could affect installation.

[0044] The ball screw 10 of the large integrated oil tank inflation device is equipped with an angle sensor 14 at its active rotation end, which can read the rotation angle value of the ball screw 10 in real time. Combined with the lead parameter P of the ball screw 10, the depth information of nut 11, nut 2 12 and nut 3 13 can be determined in real time, and the depth values ​​of pressure sensor 5 and temperature sensor 6 can be determined. A sealing joint 15 is designed between the ball screw 10 and the angle sensor 14 to play a connection and sealing role, so as to avoid new leakage due to the introduction of the ball screw 10 mechanism.

[0045] The detachable tooling includes an outer tooling cover 1 and an inner tooling cover 2, which are fixedly connected by clamping bolts 8. The outer tooling cover 1 has a U-shaped groove to avoid the ball screw 10 and the inflation interface 9, leaving space for the installation of the outer tooling cover 1 and the inner tooling cover 2, and avoiding interference and collision during the installation process.

[0046] The technical solution is further optimized by attaching an outer cover sealing gasket 3 to the bottom of the outer cover 1 and an inner cover sealing gasket 4 to the top of the inner cover 2. This provides a sealing function while effectively preventing scratches on the inner and outer surfaces of the fuel tank during installation. The inner cover 2 is designed in a convex shape, and the outer cover 11 is designed in a concave shape to match the convex shape of the inner cover. This allows for a tight fit between the inner and outer covers, resulting in good internal filling of the inflation fixture after installation, preventing hollow areas, and ensuring high overall strength and stability under high-pressure inflation.

[0047] To further optimize the technical solution, the top and bottom ends of the inner cover 2 of the tooling are fixed with mounting handles 7, and the outer cover 1 of the tooling has slots to avoid the mounting handles 7. The outer cover 1 of the tooling has keyways and threaded holes at corresponding positions. After the outer cover 1 and the inner cover 2 of the tooling are clamped to the surface of the oil tank, the bolts are tightened to complete the installation.

[0048] The pressurization device is installed through the following steps:

[0049] Step S1: Rotate the ball screw 10 to return it to zero;

[0050] Step S2: Turn on the power to pressure sensor 5 and temperature sensor 6, check the communication, and ensure that there are no communication abnormalities;

[0051] Step S3: Grab the installation handle 7, insert the tooling inner cover 2 into the oil tank, and make the inner cover sealing gasket 4 stick tightly to the inner surface of the oil tank. During the installation process, pay attention to the collision between the ball screw 10 and the inner and outer walls of the oil tank.

[0052] Step S4: Insert the outer cover 1 of the tooling into the inner cover 2 of the tooling using the clamping bolts 8 and the installation handle 7, so that the outer cover 1 is installed on the outer surface of the oil tank and the outer cover sealing gasket 3 is in close contact with the outer surface of the oil tank.

[0053] Step S5: Tighten the clamping bolts 8 in sequence, and then tighten the ball screw 10 and sealing joint 15 to complete the sealing of the inflation device;

[0054] Step S6: Connect the inflation connector to the air tightness test bench via the air inlet pipe;

[0055] Step S7: Rotate the rotating end of the ball screw 10 mechanism, control nut one 11 to drive nut two 12 and nut three 13 to move along the inflation direction, read the data of angle sensor 14 in real time, determine the nut displacement in real time through the lead, and determine the oil tank depth where pressure sensor 5 and temperature sensor 6 are located.

[0056] The variable flow inflation method that minimizes inflation and equilibration time is as follows:

[0057] Step E1: When inflating with a constant flow rate φ, the inflation time is t and the inflation volume is V; the relationship between the inflation volume V, the inflation flow rate φ and the inflation time t is shown in equation (5);

[0058] V=φt (5)

[0059] When inflation reaches time t′, the flow valve starts to adjust the inflation flow rate from φ to 0 in a linearly decreasing inflation method. The adjusted inflation time is t1. At time t1, the large integral oil tank is filled with air. The relationship between the adjusted inflation volume V, the inflation flow rate φ and the inflation time t1 is shown in equation (6).

[0060] V=(t′+t1)φ / 2 (6)

[0061] The adjusted inflation time t1 is calculated by equations (5) and (6), and the inflation time t1 corresponding to different t′ is obtained, as shown in equation (7).

[0062] t1=2t-t′ (7)

[0063] Step E2: The equilibrium time t2 of the gas inside the tank is related to the degree of disorder of the gas before equilibrium. The degree of disorder is related to the inflation method used and cannot be derived by theoretical formula. It needs to be measured by experimental means. By conducting multiple airtightness test tests with variable flow inflation, the equilibrium time t2 is recorded starting from time t1 after inflation is completed, and the equilibrium time t2 corresponding to different t′ is obtained.

[0064] Step E3: By calculating and experimenting with the datasets of t′, t1 and t2, fit the mapping relationship between t′ and t1+t2, obtain the variable flow time t′ corresponding to the minimum inflation equilibrium time t1+t2, and calculate the gas pressure p′ corresponding to the variable flow time using equation (8);

[0065]

[0066] This invention proposes a large-scale integral fuel tank inflation device with internal pressure feedback. It incorporates built-in pressure and temperature sensors, enabling real-time monitoring of the gas pressure and temperature inside the fuel tank during airtightness testing. The pressure and temperature sensors are mounted on a ball screw, allowing movement along the inflation direction. An angle sensor is also included to calculate and monitor sensor depth information in real time. Compared to existing integral fuel tank inflation fixtures, this invention achieves built-in, internally movable, and position-monitored pressure and temperature sensors.

[0067] This invention proposes a variable-flow inflation method that minimizes inflation and balancing time. By theoretically calculating the relationship between the timing of flow rate changes and inflation time, and experimentally determining the relationship between the timing of flow rate changes and balancing time, a mapping relationship is established between the timing of flow rate changes and the total inflation and balancing time. The timing of the flow rate change corresponding to the minimum inflation and balancing time is determined, and variable-flow inflation is performed when the pressure value corresponding to the timing of the flow rate change is reached. Compared with existing constant-flow inflation methods, this invention shortens the total inflation and balancing time and improves the efficiency of airtightness testing.

[0068] Example

[0069] The large-scale integrated oil tank high-efficiency pressurization device with internal pressure feedback disclosed in this invention includes:

[0070] 1) Large integrated fuel tank inflation device with internal pressure feedback

[0071] The assembly includes an outer tooling cover 1, an inner tooling cover 2, an outer cover sealing gasket 3, an inner cover sealing gasket 4, a pressure sensor 5, a temperature sensor 6, an installation handle 7, clamping bolts 8, an inflation interface 9, a ball screw 10, nut one 11, nut two 12, nut three 13, an angle sensor 14, and a sealing joint 15. The pressure sensor 5 and temperature sensor 6 are mounted inside the oil tank via a ball screw and can move along the inflation direction. Installation is performed according to the following steps:

[0072] Step 1: Rotate the ball screw to return it to zero;

[0073] Step 2: Turn on the power to pressure sensor 5 and temperature sensor 6, check the communication, and ensure that there are no communication abnormalities;

[0074] Step 3: Grab the installation handle 7, insert the tooling inner cover 2 into the oil tank, and make the inner cover sealing gasket 4 fit tightly against the inner surface of the oil tank. During the installation process, pay attention to the collision between the ball screw 10 and the inner and outer walls of the oil tank.

[0075] Step 4: Insert the outer cover 1 of the tooling into the inner cover 2 of the tooling using the clamping bolts 8 and the installation handle 7, so that the outer cover 1 is installed on the outer surface of the oil tank and the outer cover sealing gasket 3 is in close contact with the outer surface of the oil tank.

[0076] Step 5: Tighten the clamping bolts 8 in sequence, and then tighten the sealing joint 15 to complete the sealing of the inflation device;

[0077] Step 6: Connect the inflation connector 9 to the air tightness test bench through the air inlet pipe;

[0078] Step 7: Rotate the rotating end of the ball screw mechanism to control nut 11 to drive nut 2 12 and nut 3 13 to move along the inflation direction. Read the angle sensor data in real time, determine the nut displacement in real time through the lead, and determine the oil tank depth where pressure sensor 5 and temperature sensor 6 are located.

[0079] 2) Variable flow inflation method that minimizes inflation and equilibration time

[0080] Step 1: When inflating at a constant flow rate of 80 L / min, the inflation time is 50 min, and the inflation volume is 4000 L. When inflation reaches time t′, the flow valve begins to adjust the inflation flow rate from 80 L / min to 0 using a linear decreasing inflation method. The adjusted inflation time is t1, and the wing's integral fuel tank is fully inflated at time t1. The adjusted inflation time t1 can be calculated using equations (5), (6), and (7), obtaining the inflation time t1 corresponding to different t′. Some of the correspondences between t′ and t1 are shown in Table 5:

[0081]

[0082] Table 5

[0083] Step 2: Through multiple airtightness tests with variable flow inflation, starting from time t1 after inflation is completed, record the equilibrium time t2 to obtain the equilibrium time t2 corresponding to different t′. The correspondence between some t′ and t2 is shown in Table 6:

[0084]

[0085] Table 6

[0086] Step 3: Fit the mapping relationship between t′ and t1+t2 Figure 2 As shown, the time t′ corresponding to the minimum total inflation balance time t1+t2 is 33.57 min. The pressure value corresponding to the time of inflation balance is 16.79 kPa calculated by equation (8). According to the calculation results, the total inflation balance time after the change is shortened from 100 min to 81.09 min, which saves about 19 min compared with the original method.

[0087] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency pressurization device for a large integral oil tank with internal pressure feedback, characterized in that, include: The assembly includes a detachable fixture, a ball screw, an angle sensor, an inflation port, and nuts one, two, and three. The ball screw passes through the detachable fixture. The upper portion of the ball screw passes through the angle sensor and is fixed by a sealing joint. The lower portion of the ball screw is threadedly connected to nut one. Nuts two and three are welded to both sides of nut one. A pressure sensor is installed at the bottom of nut two, and a temperature sensor is installed at the bottom of nut three. An inflation port is provided through the detachable fixture. The variable flow inflation method that minimizes inflation and equilibration time is as follows: Step E1: When inflating with a fixed inflation flow rate φ, the inflation time is t and the inflation volume is V; the relationship between the inflation volume V, the fixed inflation flow rate φ and the inflation time t is shown in equation (5). V=φt (5) When inflation reaches time t′, the flow valve starts to adjust the fixed inflation flow rate from φ to 0 in a linearly decreasing inflation method. The adjusted inflation time is t1. At time t1, the large integral oil tank is filled with air. The relationship between the adjusted inflation volume V, the fixed inflation flow rate φ and the inflation time t1 is shown in equation (6). V=(t′+t1)φ / 2 (6) The adjusted inflation time t1 is calculated by equations (5) and (6), and the inflation time t1 corresponding to different t′ is obtained, as shown in equation (7). t1=2t-t′ (7) Step E2: By conducting multiple air tightness tests with variable flow inflation, start recording the equilibrium time t2 at time t1 after inflation is completed, and obtain the equilibrium time t2 corresponding to different t′. Step E3: By calculating and experimenting with the datasets of t′, t1 and t2, fit the mapping relationship between t′ and t1+t2, obtain the variable flow time t′ corresponding to the minimum inflation equilibrium time t1+t2, and calculate the gas pressure p′ corresponding to the variable flow time using equation (8); 2. The large-scale integrated oil tank high-efficiency pressurization device with internal pressure feedback as described in claim 1, characterized in that, The detachable tooling includes an outer tooling cover and an inner tooling cover, which are fixedly connected by clamping bolts; and the outer tooling cover has a U-shaped groove to avoid the ball screw and the inflation interface.

3. The high-efficiency pressurization device for a large integral oil tank with internal pressure feedback as described in claim 2, characterized in that, The bottom of the outer cover of the tooling is bonded with an outer cover sealing gasket, and the top of the inner cover of the tooling is bonded with an inner cover sealing gasket.

4. The high-efficiency pressurization device for a large integral oil tank with internal pressure feedback as described in claim 3, characterized in that, The top and bottom of the inner cover of the tooling are fixed with mounting handles, and the outer cover of the tooling has slots to avoid the mounting handles.

5. The high-efficiency pressurization device for a large integral oil tank with internal pressure feedback as described in claim 4, characterized in that, The pressurization device is installed through the following steps: Step S1: Rotate the ball screw to return it to zero; Step S2: Turn on the power to the pressure sensor and temperature sensor, check the communication, and ensure that there are no abnormalities in the communication; Step S3: Grab the installation handle and insert the tooling inner cover into the oil tank, making sure the inner cover sealing gasket is tightly against the inner surface of the oil tank. During the installation process, be careful of collisions between the ball screw and the inner and outer walls of the oil tank. Step S4: Insert the outer cover of the tooling into the inner cover of the tooling using the clamping bolts and the installation handle, so that the outer cover of the tooling is installed on the outer surface of the oil tank and the sealing gasket of the outer cover is in close contact with the outer surface of the oil tank. Step S5: Tighten the clamping bolts in sequence, and then tighten the ball screw sealing joint to complete the sealing of the inflation device; Step S6: Connect the inflation connector to the air tightness test bench via the air inlet pipe; Step S7: Rotate the rotating end of the ball screw mechanism to control nut one to drive nut two and nut three to move along the inflation direction, read the angle sensor data in real time, determine the nut displacement in real time through the lead, and determine the oil tank depth where the pressure sensor and temperature sensor are located.

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