Electrostatic testing device for shaking and vibrating process of oil tank and use method of static testing device

Abstract

The invention belongs to the field of electrostatic protection design, and particularly relates to an electrostatic testing device for the shaking and vibration process of an oil tank and a using method. The device is characterized in that a mounting edge is arranged on the composite integral oil tank, and a measuring opening is formed in the composite integral oil tank; the electrostatic measurement covering cap comprises an oil tank covering cap, a connecting flange, an insulating partition plate, a probe electrode and a sensor electrode which are connected in sequence; the oil tank covering cap is connected with the composite integral oil tank wall plate at the measurement opening; the oil level potential tester is connected with the sensor electrode through a lead; the test fixture is connected with the mounting edge of the composite integral oil tank; a bakelite plate is arranged on the shaking and vibration test bench, and the test clamp, the bakelite plate and the shaking and vibration test bench are connected through a bolt provided with an insulating sheath. According to the static testing device for the shaking and vibration process of the oil tank, oil level potential measurement in the shaking and vibration process of the oil tank can be achieved, and the insulation requirement and the strength requirement are met.

Description

Technical Field

[0001] This application belongs to the field of electrostatic protection design, and specifically relates to an electrostatic testing device and its usage method for an oil tank vibration process. Background Technology

[0002] Since the 1960s, composite materials have rapidly emerged, and the application of integral composite fuel tanks has become increasingly common. During flight, the fuel in the tank is constantly in a state of sloshing and vibration, leading to the generation and accumulation of static electricity. However, due to the poor conductivity of aviation kerosene and composite materials, the rate of static electricity leakage within the tank is very slow. When static electricity accumulates to a certain level, it can potentially generate electrostatic discharge sparks, thereby causing fires or explosions. Therefore, to prevent catastrophic accidents caused by static electricity in aircraft, integral composite fuel tanks must be designed with electrostatic protection and validated through testing.

[0003] The experiment requires measuring the oil surface potential during the vibration process of a composite material integral fuel tank. The traditional method for measuring oil surface potential involves using a plumb bob to fix a nylon rope inside the tank, with a hollow copper ball strung on the rope. The copper ball can move up and down on the rope, and a wire connects the copper ball, a sensor, and an electrostatic voltmeter. The measured potential of the copper ball is the oil surface potential at its location. This method can measure the oil surface potential during changes in oil level. However, for a fuel tank undergoing vibration, the plumb bob may damage the tank structure, the nylon rope is easily damaged by fuel pressure and inertial loads, and the position of the copper ball cannot be fixed.

[0004] Therefore, there is an urgent need for a technical solution to overcome or mitigate at least one of the aforementioned defects in the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide an electrostatic testing device and method for testing the vibration process of an oil tank, so as to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] The first aspect of this application provides an electrostatic testing device for the shaking process of an oil tank, comprising:

[0008] A composite integral oil tank, wherein the composite integral oil tank is provided with an installation edge and a measuring opening is provided on the composite integral oil tank;

[0009] An electrostatic measurement port cover includes an oil tank cover, a connecting flange, an insulating partition, a probe electrode, and a sensor electrode connected in sequence. The oil tank cover is connected to the composite integral oil tank wall panel at the measurement opening.

[0010] An oil surface potential tester, wherein the oil surface potential tester is connected to the sensor electrode via a wire;

[0011] A test fixture, which is connected to the mounting edge of the composite integral oil tank;

[0012] A vibration test bench, wherein a bakelite board is provided on the vibration test bench, and the test fixture, the bakelite board and the vibration test bench are connected by bolts with insulating sleeves.

[0013] In at least one embodiment of this application, the mounting edge includes an upper mounting edge and a lower mounting edge, both of which are parallel to the oil tank sway axis.

[0014] In at least one embodiment of this application, the measuring opening is located at the center of the composite integral tank.

[0015] In at least one embodiment of this application, the fuel tank cap is connected to the composite integral fuel tank wall panel at the measuring opening by bolts and a support plate nut.

[0016] In at least one embodiment of this application, one end of the probe electrode is connected to the insulating partition, and the other end is a stainless steel ball that contacts the oil surface as a current collector electrode, wherein the stainless steel ball has a hollow structure.

[0017] In at least one embodiment of this application, an insulating ring is installed in the test field, and the wire passes through the insulating ring and is connected to the oil surface potential tester.

[0018] In at least one embodiment of this application, the test fixture includes a mounting base and a Z-shaped positioning plate;

[0019] The mounting base is provided with an upper positioning plate and a lower positioning plate. The upper positioning plate is connected to the lower mounting edge of the composite integral oil tank, and the lower positioning plate is connected to the bakelite board and the vibration test bench.

[0020] The upper end of the Z-shaped positioning plate is connected to the upper mounting edge of the composite integral oil tank, and the lower end of the Z-shaped positioning plate is connected to the upper positioning plate.

[0021] In at least one embodiment of this application, the Z-shaped positioning plate is provided with weight reduction holes.

[0022] In at least one embodiment of this application, the thickness of the bakelite board is no greater than 10 mm.

[0023] In at least one embodiment of this application, the thickness of the bakelite board is 5 mm.

[0024] In at least one embodiment of this application, the insulating sheath is made of polytetrafluoroethylene (PTFE).

[0025] The second aspect of this application provides a method for electrostatic testing of a fuel tank during vibration, based on the aforementioned electrostatic testing device for a fuel tank during vibration, comprising:

[0026] Step 1: Clean each component of the probe electrode with anhydrous ethanol;

[0027] Step 2: Connect the oil tank cover, connecting flange, insulating partition, probe electrode and sensor electrode in sequence, assemble the electrostatic measurement cover, and lead out the wires;

[0028] Step 3: Connect the electrostatic measurement port cover to the composite material integrated oil tank and confirm that the probe electrode is in the preset position;

[0029] Step 4: Hoist the composite integral oil tank onto the test fixture and connect the test fixture to the composite integral oil tank;

[0030] Step 5: Place the bakelite board on the vibration test bench, and hoist the test fixture and composite material integrated oil tank assembly onto the bakelite board. Connect the test fixture, bakelite board and vibration test bench with bolts equipped with insulating sleeves.

[0031] Step 6: Pass the wire through the insulating ring and connect it to the oil surface potential tester;

[0032] Step 7: Measure the ground insulation resistance and ground capacitance of the electrostatic test device during the oil tank vibration process to ensure that the insulation requirements are met.

[0033] In at least one embodiment of this application, in step 8, the insulation requirement is an insulation resistance to ground greater than 10 ohms. 14 Ω, capacitance to ground is less than 100pF.

[0034] The invention has at least the following beneficial technical effects:

[0035] The electrostatic testing device for the oil tank vibration process disclosed in this application can measure the oil surface potential during the oil tank vibration process, meeting the insulation and strength requirements. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of an electrostatic testing device for the shaking process of an oil tank according to one embodiment of this application;

[0037] Figure 2 This is a schematic diagram of an electrostatic measurement port cover according to one embodiment of this application;

[0038] Figure 3 This is a schematic diagram of a bakelite board according to one embodiment of this application;

[0039] Figure 4 This is a schematic diagram of an insulating sheath according to one embodiment of this application.

[0040] in:

[0041] 1-Composite integral oil tank; 2-Electrostatic measurement port cover; 21-Oil tank port cover; 22-Connecting flange; 23-Insulating partition; 24-Probe electrode; 25-Sensor electrode; 3-Oil surface potential tester; 4-Wire; 5-Test fixture; 6-Vibration test bench; 7-Bakelite board; 8-Insulating sleeve; 9-Insulating ring. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0043] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 limiting the scope of protection of this application.

[0044] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0045] The first aspect of this application provides an electrostatic testing device for the shaking process of an oil tank, comprising: a composite integral oil tank 1, an electrostatic measuring port cover 2, an oil surface potential tester 3, a test fixture 5, and a shaking test bench 6.

[0046] Specifically, such as Figure 1 As shown, the composite integral oil tank 1 is provided with an installation edge, and a measuring opening is provided on the composite integral oil tank 1.

[0047] In a preferred embodiment of this application, the mounting edges on the composite integral fuel tank 1 include upper mounting edges and lower mounting edges. Two upper mounting edges and two lower mounting edges are symmetrically arranged, and both the upper and lower mounting edges are parallel to the fuel tank's sway axis. In this embodiment, a coordinate system is constructed, with the fuel tank's sway axis parallel to the X-axis. The measurement opening is located at the center of the upper wall panel of the composite integral fuel tank 1.

[0048] like Figure 2 As shown, the electrostatic measurement port cover 2 includes an oil tank cover 21, a connecting flange 22, an insulating partition 23, a probe electrode 24, and a sensor electrode 25 connected in sequence. The oil tank cover 21 is connected to the wall panel of the composite integral oil tank 1 at the measurement opening. The connection between the electrostatic measurement port cover 2 and the composite integral oil tank 1 is designed to be detachable. In the preferred embodiment of this application, the oil tank cover 21 is connected to the wall panel of the composite integral oil tank 1 at the measurement opening by bolts and a support nut.

[0049] A measuring hole is provided on the oil tank cap 21. The connecting flange 22 seals the opening of the oil tank cap 21 to prevent oil from splashing during shaking. The probe electrode 24 extends into the oil tank through the measuring hole of the oil tank cap 21. In this embodiment, one end of the probe electrode 24 is connected to the insulating partition 23, and the other end is a stainless steel ball that contacts the oil surface as a current collector electrode. The stainless steel ball has a hollow structure.

[0050] The oil surface potential tester 3 is connected to the sensor electrode 25 via a wire 4. In a preferred embodiment of this application, an insulating ring 9 is installed in the test area, and the wire 4 passes through the insulating ring 9 to connect to the oil surface potential tester 3. The oil surface potential tester 3 should be a product with intrinsically safe explosion-proof certification.

[0051] The test fixture 5 is connected to the mounting edge of the composite integral oil tank 1, and the test fixture 5 is connected to two sides parallel to the shaking axis of the oil tank. In a preferred embodiment of this application, the test fixture 5 includes a mounting base and a Z-shaped positioning plate; the mounting base is provided with an upper positioning plate and a lower positioning plate, the upper positioning plate is connected to the lower mounting edge of the composite integral oil tank 1, and the lower positioning plate is connected to the bakelite board 7 and the shaking test bench 6; the upper end of the Z-shaped positioning plate is connected to the upper mounting edge of the composite integral oil tank 1, and the lower end of the Z-shaped positioning plate is connected to the upper positioning plate. It is understood that the Z-shaped positioning plate is provided with weight reduction holes.

[0052] A bakelite board 7 is installed on the vibration test bench 6, and the test fixture 5, the bakelite board 7 and the vibration test bench 6 are connected by bolts with insulating sleeves 8.

[0053] In the preferred embodiment of this application, such as Figure 3 As shown, the thickness of the bakelite board 7 is no greater than 10 mm. In this embodiment, the thickness of the bakelite board 7 is 5 mm.

[0054] In the preferred embodiment of this application, such as Figure 4 As shown, the insulating sleeve 8 is a custom-made part, made of polytetrafluoroethylene, and its dimensions should match the structure of the steel bolts used.

[0055] Based on the above-mentioned electrostatic testing device for the oil tank vibration process, a second aspect of this application provides a method for using the electrostatic testing device for the oil tank vibration process, including:

[0056] Step 1: Clean each component of the probe electrode 24 with anhydrous ethanol;

[0057] Step 2: Connect the oil tank cover 21, connecting flange 22, insulating partition 23, probe electrode 24 and sensor electrode 25 in sequence, assemble the electrostatic measurement cover 2, and lead out the wire 4;

[0058] Step 3: Connect the electrostatic measurement port cover 2 to the composite material integral oil tank 1, and confirm that the probe electrode 24 is in the preset position;

[0059] Step 4: Hoist the composite integral oil tank 1 onto the test fixture 5, and connect the test fixture 5 to the composite integral oil tank 1;

[0060] Step 5: Place the bakelite board 7 on the vibration test bench 6, and hoist the test fixture 5 and the composite integral oil tank 1 together onto the bakelite board 7. Connect the test fixture 5, the bakelite board 7 and the vibration test bench 6 with bolts equipped with insulating sleeves 8.

[0061] Step 6: Pass wire 4 through insulating ring 9 and connect it to oil surface potential tester 3;

[0062] Step 7: Measure the ground insulation resistance and ground capacitance of the electrostatic test device during the oil tank vibration process to ensure that the insulation requirements are met.

[0063] In step 1, the stainless steel ball and other components of the probe electrode 24 are cleaned 2 to 3 times with anhydrous ethanol.

[0064] In step 3, the length of the probe electrode 24 is predetermined based on the oil level in the tank. After the electrostatic measurement port cover 2 is connected to the composite integral tank 1, the position of the stainless steel ball of the probe electrode 24 in the electrostatic measurement port cover 2 should be located at the center of the Y-axis direction of the tank.

[0065] In step 8, the insulation requirement is that the insulation resistance to ground is greater than 10 ohms. 14 The resistance to ground is Ω, and the capacitance to ground is less than 100pF. Measuring the insulation resistance to ground and capacitance to ground of the electrostatic discharge (ESD) testing device during the oil tank vibration process is to verify that the ESD testing device meets the insulation requirements.

[0066] The electrostatic testing device and method for the fuel tank vibration process disclosed in this application can measure the oil surface potential during fuel tank vibration. To ensure the accuracy of the electrostatic measurement results and the safety of the vibration process, steel bolts with insulating sleeves 8 are used for the fixed connection of the test fixture 5, bakelite board 7, and vibration test bench 6, thereby achieving ground insulation. Based on this, the oil surface potential is measured during fuel tank vibration using the electrostatic measurement port cover 2. This application has been applied to the electrostatic protection test of the integral fuel tank of a certain type of aircraft wing composite material, and meets the usage requirements.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electrostatic testing device for the shaking process of an oil tank, characterized in that, include: A composite integral oil tank (1) is provided with an installation edge and a measurement opening is provided on the composite integral oil tank (1); The electrostatic measurement port cover (2) includes an oil tank cover (21), a connecting flange (22), an insulating partition (23), a probe electrode (24), and a sensor electrode (25) connected in sequence. The oil tank cover (21) is connected to the wall panel of the composite integral oil tank (1) at the measurement opening. An oil surface potential tester (3) is connected to the sensor electrode (25) via a wire (4); Test fixture (5), the test fixture (5) is connected to the mounting edge of the composite integral oil tank (1); A vibration test bench (6) is provided with a bakelite board (7), and the test fixture (5), the bakelite board (7) and the vibration test bench (6) are connected by bolts with insulating sleeves (8).

2. The electrostatic testing device for the oil tank vibration process according to claim 1, characterized in that, The mounting edge includes an upper mounting edge and a lower mounting edge, both of which are parallel to the oil tank sway axis.

3. The electrostatic testing device for the oil tank vibration process according to claim 2, characterized in that, The measuring opening is located at the center of the composite integral oil tank (1).

4. The electrostatic testing device for the oil tank vibration process according to claim 3, characterized in that, The oil tank cover (21) is connected to the composite integral oil tank (1) wall panel at the measuring opening by bolts and a support plate nut.

5. The electrostatic testing device for the oil tank vibration process according to claim 4, characterized in that, One end of the probe electrode (24) is connected to the insulating partition (23), and the other end is a stainless steel ball that contacts the oil surface as a current collector electrode. The stainless steel ball has a hollow structure.

6. The electrostatic testing device for the oil tank vibration process according to claim 5, characterized in that, An insulating ring (9) is installed in the test field, and the wire (4) passes through the insulating ring (9) and is connected to the oil surface potential tester (3).

7. The electrostatic testing device for the oil tank vibration process according to claim 6, characterized in that, The test fixture (5) includes a mounting base and a Z-shaped positioning plate; The mounting base is provided with an upper positioning plate and a lower positioning plate. The upper positioning plate is connected to the lower mounting edge of the composite integral oil tank (1), and the lower positioning plate is connected to the bakelite board (7) and the vibration test bench (6). The upper end of the Z-shaped positioning plate is connected to the upper mounting edge of the composite integral oil tank (1), and the lower end of the Z-shaped positioning plate is connected to the upper positioning plate.

8. The electrostatic testing device for the oil tank vibration process according to claim 7, characterized in that, The Z-shaped positioning plate has weight-reduction holes.

9. The electrostatic testing device for the oil tank vibration process according to claim 8, characterized in that, The thickness of the bakelite board (7) is no more than 10 mm.

10. The electrostatic testing device for the oil tank vibration process according to claim 9, characterized in that, The thickness of the bakelite board (7) is 5 mm.

11. The electrostatic testing device for the oil tank vibration process according to claim 10, characterized in that, The insulating sheath (8) is made of polytetrafluoroethylene.

12. A method of using an electrostatic testing device for a tank vibration process, based on the electrostatic testing device for a tank vibration process according to any one of claims 1 to 11, characterized in that, include: Step 1: Clean each component of the probe electrode (24) with anhydrous ethanol; Step 2: Connect the oil tank cover (21), connecting flange (22), insulating partition (23), probe electrode (24) and sensor electrode (25) in sequence, assemble the electrostatic measurement cover (2), and lead out the wire (4); Step 3: Connect the electrostatic measurement port cover (2) to the composite integral oil tank (1) and confirm that the probe electrode (24) is in the preset position; Step 4: Hoist the composite integral oil tank (1) onto the test fixture (5) and connect the test fixture (5) to the composite integral oil tank (1). Step 5: Place the bakelite board (7) on the vibration test bench (6), and hoist the test fixture (5) and the composite integral oil tank (1) onto the bakelite board (7). Connect the test fixture (5), the bakelite board (7) and the vibration test bench (6) with bolts equipped with insulating sleeves (8). Step 6: Pass the wire (4) through the insulating ring (9) and connect it to the oil surface potential tester (3); Step 7: Measure the ground insulation resistance and ground capacitance of the electrostatic test device during the oil tank vibration process to ensure that the insulation requirements are met.

13. The method of using the electrostatic testing device for the oil tank vibration process according to claim 12, characterized in that, In step 8, the insulation requirement is that the insulation resistance to ground is greater than 10 ohms. 14 Ω, capacitance to ground is less than 100pF.

Images