Oil tank opening cover sealing structure
By using a combination structure of blind hole pulling rivet nuts and sealing rings on the drone oil tank, the problem of poor sealing performance of the fuel tank cover is solved, simple disassembly and efficient sealing is achieved, and installation costs and difficulty are reduced.
Patent Information
- Application Number
- CN202420597087.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The sealing performance of the drone oil tank cover is poor, and there are problems such as difficulty in disassembly and assembly, high cost, difficulty in installation and degradation of sealing performance for a long time.
The combination structure of blind hole rivet nut and sealing ring is adopted. The blind hole rivet nut is first riveted and riveted on the oil tank, and the bolts and installation chambers are used to fix the mouth cover, reducing the disassembly and assembly parts, reducing installation costs and difficulty, and improving the sealing effect through sealing rings and sealing gaskets.
It realizes simple disassembly and efficient sealing of the fuel tank cover, reducing installation costs and difficulty, and ensuring long-term and stable sealing performance.
Smart Images
Figure CN222769578U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of aircraft oil tank sealing, and in particular relates to an oil tank cover sealing structure. Background Art
[0002] As the core component of drone fuel storage, the UAV fuel tank needs to have excellent sealing performance to ensure the flight safety and effective operation of the aircraft. With the continuous maturity of the integrated molding process of composite materials, the overall fuel tank and the multi-chamber fuel tank can be molded at one time, which greatly reduces the risk of fuel tank leakage. At the same time, in order to ensure daily maintenance and overhaul, the fuel tank cover needs to be retained. The current sealing method between the fuel tank cover and the tank body is generally threaded connection, O-ring sealing and airtight support plate nut connection sealing, but these sealing methods have the disadvantages of difficult disassembly and assembly, high cost, difficult installation, and reduced sealing performance after long-term use, making it difficult to ensure ideal sealing performance.
[0003] In view of the above problems, it is necessary to design a sealing device for the UAV composite fuel tank cover to ensure the sealing performance of the fuel tank cover. Utility Model Content
[0004] In order to solve the technical problem of poor sealing of the fuel tank cover in the UAV existing in the background technology, the purpose of the utility model is to provide a fuel tank cover sealing structure that can solve the above technical problem.
[0005] The technical solution for achieving the purpose of the utility model is: a fuel tank cover sealing structure, comprising a fuel tank, a cover, a blind hole rivet nut, a bolt and a sealing ring, the fuel tank is provided with a first mounting hole through which the blind hole rivet nut passes, the cover is provided with a second mounting hole through which the bolt passes, the blind hole rivet nut has a mounting cavity, the bolt passes through the second mounting hole and is inserted into the mounting cavity of the blind hole rivet nut; the blind hole rivet nut also has a cap body and a rod body, the rod body is installed in the first mounting hole, the connection between the cap body and the rod body is provided with a mounting groove, and the sealing ring is at least partially installed in the mounting groove.
[0006] In this technical solution, a blind hole rivet nut is used, and the blind hole rivet nut is first riveted to the fuel tank. Since the blind hole rivet nut has an installation cavity, when installing the cover, it is only necessary to fix the cover to the blind hole rivet nut with bolts, without disassembling the blind hole rivet nut, reducing the number of disassembly parts, and reducing the problem of loose parts and poor sealing caused by disassembly. Specifically, an installation groove is set under the cap body of the blind hole rivet nut and at the connection between the rod body, and a sealing ring that can seal the gap between the cap body and the fuel tank is installed in the installation groove to block the external liquid or gas from entering the channel in the first installation hole from this gap, thereby ensuring the sealing effect. In this way, the fuel tank cover is easy to disassemble and assemble, reducing the installation cost and difficulty, and the sealing effect is tight and can be used for a long time.
[0007] Furthermore, the sealing ring is a retractable structure, and the sealing ring is installed in the installation groove after being compressed and shrunk. The sealing ring is a retractable structure similar to a sponge, which shrinks into the installation groove when subjected to pressure, and shrinks and installs in the installation groove when the blind hole rivet nut is installed on the oil tank, thereby blocking the gap between the cap body and the oil tank and ensuring the sealing of the first installation hole.
[0008] Furthermore, the sealing structure also includes a sealing gasket, which is sleeved on the cap body. Further adding a sealing gasket between the port cover and the oil tank can not only prevent the possibility of liquid, gas or other objects entering the gap between the cap body and the oil tank again at the periphery of the cap body, but also block the possibility of entering the gap between the cap body and the port cover, and cut off the possibility of liquid, gas or other objects entering the installation cavity along the outer wall of the bolt, so as to ensure the cleanliness of the installation cavity, so that the blind hole rivet nut can be used for a long time, reducing the cost of replacing the blind hole rivet nut and the resulting component sealing problem.
[0009] Furthermore, the sealing structure further comprises a structural adhesive, which is coated on the inner wall of the oil tank and is located around the first mounting hole. During assembly, the structural adhesive is first sprayed on the inner wall of the oil tank, specifically around the first mounting hole, so that after the blind hole rivet nut is mechanically fastened, a structural adhesive seal is formed between the instantaneous cap formed by the blind hole rivet nut and the inner wall of the oil tank, further preventing the possibility of liquid, gas or other objects entering the interior of the oil tank from the first mounting hole, and the structural adhesive can also play a role in fixing the blind hole rivet nut on the oil tank.
[0010] Furthermore, the sealing structure further comprises a flat washer, which is located between the bolt head and the cover. The flat washer can prevent liquid, gas or other objects from entering the second mounting hole through the gap between the bolt head and the cover, thereby improving the sealing effect.
[0011] By adopting the above technical solution, the utility model has the following beneficial effects:
[0012] (1) A blind hole rivet nut is first fixed on the fuel tank. The blind hole rivet nut has a bolt installation cavity. The cover can be fixed on the fuel tank by using the installation cooperation between the bolt and the installation cavity, eliminating the need to disassemble and assemble the components on the fuel tank each time. The disassembly and assembly is convenient, the cost is low, and the problem of unseal caused by disassembling and assembling components is reduced;
[0013] (2) A mounting groove is provided between the cap body and the rod body of the blind hole rivet nut, and a retractable sealing ring can be filled in the mounting groove to block the gap between the cap body and the outer wall of the oil tank, thereby preventing foreign matter from entering the oil tank through the first mounting hole;
[0014] (3) Adding a sealing gasket not only further seals the gap between the cap body and the outer wall of the oil tank, but also blocks the problem of foreign matter entering the installation cavity through the outer wall of the bolt, thereby improving the long-term use of the blind hole rivet nut;
[0015] (4) Structural adhesive is sprayed around the first mounting hole on the inner wall of the fuel tank. After the blind hole rivet nut is mechanically fastened, the space between the cap body and the inner wall of the fuel tank is filled with structural adhesive, which further prevents foreign matter from entering the fuel tank from the first mounting hole and also plays a role in fixing the blind hole rivet nut on the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.
[0017] Figure 1 This is a schematic diagram of the structure of the blind hole rivet nut in the utility model;
[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0019] Figure 3 This is a structural schematic diagram of the blind hole rivet nut in the utility model being installed on the fuel tank;
[0020] Figure 4 It is a cross-sectional view of the overall structure of the sealing structure in the utility model.
[0021] The numbers in the accompanying drawings are: 1 oil tank; 2 cover; 3 blind hole rivet nut; 4 bolt; 5 sealing ring; 6 first mounting hole; 7 second mounting hole; 8 mounting cavity; 9 cap body; 10 rod body; 11 mounting groove; 12 bolt head; 13 sealing gasket; 14 structural adhesive; 15 flat washer; 16 instantaneous cap body. DETAILED DESCRIPTION
[0022] Example:
[0023] like Figure 1-Figure 4As shown, this embodiment provides a fuel tank cover sealing structure, including a fuel tank 1, a cover 2, a blind hole rivet nut 3, a bolt 4 and a sealing ring 5. The fuel tank 1 is provided with a first mounting hole 6 through which the blind hole rivet nut 3 passes, and the cover 2 is provided with a second mounting hole 7 through which the bolt 4 passes. The blind hole rivet nut 3 has a mounting cavity 8, and the bolt 4 is inserted into the mounting cavity 8 of the blind hole rivet nut 3 after passing through the second mounting hole 7; the blind hole rivet nut 3 also has a cap body 9 and a rod body 10, and the rod body 10 is installed in the first mounting hole 6. The connection between the cap body 9 and the rod body 10 is provided with a mounting groove 11, and the sealing ring 5 is at least partially installed in the mounting groove 11. In the present technical solution, a blind hole rivet nut 3 is used, and the blind hole rivet nut 3 is first riveted to the oil tank 1. Since the blind hole rivet nut 3 has an installation cavity 8, when installing the cover 2, it is only necessary to fix the cover 2 on the blind hole rivet nut 3 with the bolt 4, and there is no need to disassemble the blind hole rivet nut 3, thereby reducing the number of disassembly parts and reducing the problem of loose parts caused by disassembly and assembly, resulting in poor sealing. Specifically, an installation groove 11 is provided below the cap body 9 of the blind hole rivet nut 3 and at the connection between the rod body 10, and a sealing ring 5 that can seal the gap between the cap body 9 and the oil tank 1 is installed in the installation groove 11 to block the external liquid or gas from entering the passage in the first installation hole 6 from this gap, thereby ensuring the sealing effect. In this way, the cover 2 of the oil tank 1 is easy to disassemble and assemble, which reduces the installation cost and difficulty, and the sealing effect is tight and can be used for a long time.
[0024] Preferably, the sealing ring 5 is a retractable structure, and the sealing ring 5 is installed in the installation groove 11 after being compressed and shrunk. The sealing ring 5 is a retractable structure similar to a sponge, which shrinks into the installation groove 11 when subjected to pressure, and is shrunk and installed in the installation groove 11 when the blind hole rivet nut 3 is installed on the oil tank 1, thereby blocking the gap between the cap body 9 and the oil tank 1 and ensuring the sealing of the first installation hole 6.
[0025] like Figure 4 As shown, the sealing structure also includes a sealing gasket 13, and the sealing gasket 13 is sleeved on the cap body 9. Further, adding a sealing gasket 13 between the cover 2 and the oil tank 1 can not only prevent the possibility of liquid, gas or other objects entering the gap between the cap body 9 and the oil tank 1 again at the periphery of the cap body 9, but also block the possibility of entering the gap between the cap body 9 and the cover 2, and cut off the possibility of liquid, gas or other objects entering the installation cavity 8 along the outer wall of the bolt 4, so as to ensure the cleanliness of the installation cavity 8, so that the blind hole rivet nut 3 can be used for a long time, and the cost of replacing the blind hole rivet nut 3 and the sealing problem of the components caused can be reduced.
[0026] Preferably, the sealing structure further comprises a structural adhesive 14, which is coated on the inner wall of the fuel tank 1 and is located around the first mounting hole 6. During assembly, the structural adhesive 14 is first sprayed on the inner wall of the fuel tank 1, specifically around the first mounting hole 6, so that after the blind hole rivet nut 3 is mechanically fastened, a structural adhesive 14 seal is formed between the instantaneous cap 16 formed by the blind hole rivet nut 3 and the inner wall of the fuel tank 1, further preventing the possibility of liquid, gas or other objects entering the interior of the fuel tank 1 from the first mounting hole 6, and the structural adhesive 14 can also play a role in fixing the blind hole rivet nut 3 on the fuel tank 1.
[0027] Preferably, the sealing structure further includes a flat washer 15, which is located between the bolt head 12 and the cover 2. The flat washer 15 can prevent liquid, gas or other objects from entering the second mounting hole 7 from the gap between the bolt head 12 and the cover 2, thereby improving the sealing effect.
[0028] Working principle: a blind hole rivet nut 3 component is used in the closed structure of the aircraft fuel tank 1 cover 2, and the blind hole rivet nut 3 is first fixed on the fuel tank 1, and it has a bolt 4 mounting cavity 8, so there is no need to remove the fixing components on the fuel tank 1 every time; a mounting cavity 8 is provided between the cap body 9 and the rod body 10 of the blind hole rivet nut 3, and the mounting cavity 8 is filled with a retractable sealing ring 5 to block the gap between the cap body 9 and the fuel tank 1 to prevent foreign matter from entering the fuel tank 1; structural glue 14 is sprayed on the inner wall of the fuel tank 1, and when the blind hole rivet nut 3 is mechanically fastened, the structural glue 14 is fixed between the instantaneous cap body 16 and the inner wall of the fuel tank 1, further preventing the possibility of foreign matter in the first mounting hole 6 entering the fuel tank 1.
[0029] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A fuel tank cover sealing structure, characterized in that: The invention comprises an oil tank (1), a cover (2), a blind hole rivet nut (3), a bolt (4) and a sealing ring (5); the oil tank (1) is provided with a first mounting hole (6) through which the blind hole rivet nut (3) passes; the cover (2) is provided with a second mounting hole (7) through which the bolt (4) passes; the blind hole rivet nut (3) has a mounting cavity (8); the bolt (4) passes through the second mounting hole (7) and is inserted into the mounting cavity (8) of the blind hole rivet nut (3); the blind hole rivet nut (3) also has a cap body (9) and a rod body (10); the rod body (10) is mounted in the first mounting hole (6); a mounting groove (11) is provided at the connection between the cap body (9) and the rod body (10); and the sealing ring (5) is at least partially mounted in the mounting groove (11).
2. The fuel tank cover sealing structure according to claim 1, characterized in that: The sealing ring (5) is a retractable structure, and the sealing ring (5) is installed in the installation groove (11) after being compressed and shrunk.
3. The fuel tank cover sealing structure according to claim 1, characterized in that: The sealing structure also includes a sealing gasket (13), and the sealing gasket (13) is sleeved on the cap body (9).
4. The fuel tank cover sealing structure according to claim 1, characterized in that: The sealing structure also includes structural adhesive (14), which is coated on the inner wall of the oil tank (1) and is located around the first mounting hole (6).
5. The fuel tank cover sealing structure according to claim 1, characterized in that: The sealing structure further comprises a flat washer (15), wherein the flat washer (15) is located between the bolt head (12) and the port cover (2).