An oil receiving valve

Abstract

The present application discloses a kind of oil receiving valve, including support valve body, compression element and compression adjusting element, compression adjusting element is connected with support valve body and the connecting position of two can be adjusted, elastic member is arranged between compression adjusting element and compression element.When fuel is injected into oil tank, force is applied to compression element and sealing element, compression element compresses elastic member and slides towards the direction of compression adjusting element, sealing element is separated from oil injection port, fuel from oil injection port passes through oil passage connected with oil injection port and is injected into oil tank;After oil injection is completed, the force applied to compression element and sealing element is removed, and the oil injection port is resealed. Adjust the connecting position of compression adjusting element and support valve body to change the compression state of the elastic member, thereby adjusting the force applied to the compression element and the sealing element, so that the oil receiving valve meets the engineering requirements of different aircraft fuel tanks and improves the adaptability of the oil receiving valve.

Description

Technical Field

[0001] This invention relates to the technical field of aircraft fuel tanks and their surrounding facilities, and in particular to a fuel receiving valve. Background Technology

[0002] As our understanding of unmanned aerial vehicles (UAVs) deepens and their applications expand, numerous models and specifications have emerged. Depending on the service conditions, the refueling valves on the fuel tanks require diverse forms and types, with the main focus on three requirements: adjustable sealing pressure, internal embedding within the fuel tank, and ensuring the aerodynamic performance of the aircraft. Given the interchangeability and versatility of aircraft, and based on the user's service test results, it is required to design and manufacture a refueling valve that integrates these three advantages, ensuring good assembly interchangeability and guaranteeing the aerodynamic shape of the aircraft.

[0003] Depending on the intended use of the unmanned aerial vehicle (UAV), the minimum overload acceleration range is 5g, and the maximum can reach 20g. The conventional approach is to design different oil receiving valves for different models. However, this is not suitable for small-batch, multi-model production, resulting in low production efficiency and poor interchangeability of the oil receiving valve manufacturing process and assembly.

[0004] Therefore, how to change the current situation where the sealing pressure of the oil tank receiving valve is not adjustable, resulting in poor adaptability of the receiving valve, has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an oil receiving valve to solve the problems existing in the prior art, so that the sealing pressure of the oil receiving valve can be adjusted and the adaptability of the oil tank receiving valve can be improved.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides an oil receiving valve, comprising:

[0007] A valve body is provided, the valve body having an oil inlet;

[0008] A clamping element is slidably disposed in the support valve body, and a sealing element is disposed on the side of the clamping element near the oil inlet, so that the clamping element can block the oil inlet by means of the sealing element;

[0009] A clamping adjustment element is provided, which is connected to the support valve body and the connection position between the two can be adjusted. An elastic element is provided between the clamping adjustment element and the clamping element. Changing the connection position between the clamping adjustment element and the support valve body can change the compression state of the elastic element. The clamping adjustment element has an oil passage hole. After the sealing element is separated from the oil inlet, the oil inlet is connected to the oil passage hole.

[0010] Preferably, the clamping adjustment element is threadedly connected to the support valve body.

[0011] Preferably, the end of the clamping adjustment element away from the elastic element is provided with an adjustment groove;

[0012] The elastic element is a spring.

[0013] Preferably, both the clamping element and the clamping adjustment element are provided with a limiting groove capable of accommodating the elastic element, and the limiting groove of the clamping element and the limiting groove of the clamping adjustment element are arranged opposite to each other.

[0014] Preferably, the oil passage includes a central oil passage and side oil passages. Both the central oil passage and the side oil passages are connected to the inner cavity of the supporting valve body. The central oil passage is coaxially arranged with the pressing adjustment element and connected to the limiting groove. There are multiple side oil passages, which are evenly distributed circumferentially around the axis of the limiting groove.

[0015] Preferably, the clamping element has a sliding surface and a side surface, and there are two sets of both the sliding surface and the side surface. The two sets of sliding surfaces and the two sets of side surfaces are symmetrically arranged about the axis of the clamping element. The sliding surface is slidably abuts against the inner wall of the supporting valve body. The sliding surface is an arc surface, and the side surface is a plane. The distance between the two sets of side surfaces is less than the inner diameter of the supporting valve body. An oil supply hole is provided on the side surface, and the oil supply hole is connected to the inner cavity of the supporting valve body.

[0016] Preferably, the sealing element has a mounting protrusion at one end facing the pressing element. The mounting protrusion is annular, and the pressing element has a mounting groove that matches the mounting ring. The mounting protrusion engages with the mounting groove. The pressing element also has a limiting post at one end near the oil inlet. The mounting groove surrounds the limiting post, and the sealing element is fitted onto the outside of the limiting post. The diameter of the limiting post is smaller than the diameter of the oil inlet.

[0017] Preferably, an annular sealing ridge is provided on the contact surface between the supporting valve body and the sealing element, the sealing element has a sealing surface, the sealing surface is a plane, and the sealing ridge can squeeze the sealing element and abut against the sealing surface.

[0018] Preferably, the number of sealing ridges is multiple, the sealing ridges are arranged radially at intervals along the oil inlet, and the axial cross section of the sealing ridges is semi-circular.

[0019] Preferably, the oil receiving valve further includes a pneumatic cover, which is detachably connected to the supporting valve body. The pneumatic cover is disposed on one side of the oil inlet, and the side of the pneumatic cover away from the oil inlet has a pneumatic profile.

[0020] There are multiple pneumatic covers, and when the pneumatic cover is connected to the support valve body, the pneumatic cover and the support valve body are plugged into each other.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] When fuel is injected into the fuel tank using the fuel receiving valve of this invention, a force is applied to the clamping element and the sealing element. The clamping element compresses the elastic element and slides towards the clamping adjustment element, while the sealing element separates from the fuel inlet. The fuel entering through the fuel inlet passes through an oil passage connected to the fuel inlet and is injected into the fuel tank. After fuel injection is completed, the force applied to the clamping element and the sealing element is removed. Under the force of the elastic element restoring its deformation, the clamping element and the sealing element reset and re-seal the fuel inlet. It is important to emphasize that adjusting the connection position between the clamping adjustment element and the supporting valve body can change the compression state of the elastic element, thereby adjusting the magnitude of the force pushing the clamping element and the sealing element. This allows the fuel receiving valve to meet the engineering requirements of different aircraft fuel tanks and improves the adaptability of the fuel receiving valve. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the oil receiving valve disclosed in the embodiments of the present invention;

[0025] Figure 2 This is a cross-sectional structural diagram of the oil receiving valve disclosed in the embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of the oil receiving valve when it is open, as disclosed in the embodiments of the present invention;

[0027] Figure 4 This is an isometric view of the support valve body of the oil receiving valve disclosed in the embodiments of the present invention;

[0028] Figure 5 This is a cross-sectional schematic diagram of the support valve body of the oil receiving valve disclosed in the embodiment of the present invention;

[0029] Figure 6This is an isometric view of the clamping adjustment element disclosed in the embodiments of the present invention;

[0030] Figure 7 This is an isometric view of other angles of the clamping adjustment element disclosed in the embodiments of the present invention;

[0031] Figure 8 This is a cross-sectional schematic diagram of the clamping adjustment element disclosed in the embodiment of the present invention;

[0032] Figure 9 This is an isometric view of the clamping element disclosed in the embodiments of the present invention;

[0033] Figure 10 These are isometric views of the clamping element at other angles disclosed in the embodiments of the present invention;

[0034] Figure 11 This is a cross-sectional schematic diagram of the clamping element disclosed in the embodiments of the present invention;

[0035] Figure 12 This is an isometric view of the sealing element disclosed in the embodiments of the present invention;

[0036] Figure 13 These are isometric views of the sealing element at other angles disclosed in the embodiments of the present invention;

[0037] Figure 14 This is a cross-sectional schematic diagram of the sealing element disclosed in the embodiments of the present invention;

[0038] Figure 15 This is a schematic diagram of the structure of the elastic element disclosed in the embodiments of the present invention;

[0039] Figure 16 This is a schematic diagram of the structure of the pneumatic cover disclosed in the embodiment of the present invention;

[0040] Figure 17 This is a cross-sectional schematic diagram of the pneumatic cover disclosed in the embodiment of the present invention;

[0041] Figure 18 This is a schematic diagram of the oil receiving valve disclosed in Embodiment 1 of the present invention;

[0042] Figure 19 This is a partial structural schematic diagram of the oil receiving valve disclosed in Embodiment 1 of the present invention;

[0043] Figure 20 This is a schematic diagram of the oil receiving valve being opened according to Embodiment 1 of the present invention;

[0044] Figure 21 for Figure 18 Schematic diagram of the oil receiving valve at other angles;

[0045] Figure 22This is a schematic diagram of the oil circuit of the oil receiving valve disclosed in Embodiment 1 of the present invention. Figure 1 ;

[0046] Figure 23 This is a schematic diagram of the oil circuit of the oil receiving valve disclosed in Embodiment 1 of the present invention. Figure 2 ;

[0047] Figure 24 This is a schematic diagram of the oil circuit of the oil receiving valve disclosed in Embodiment 1 of the present invention. Figure 3 .

[0048] Among them, 1 is the valve body support, 101 is the oil inlet, 102 is the sealing protrusion, 2 is the clamping element, 201 is the sliding surface, 202 is the side surface, 203 is the oil supply hole, 204 is the mounting groove, 205 is the limiting post, 3 is the clamping adjustment element, 301 is the oil passage hole, 302 is the adjustment groove, 303 is the center oil passage hole, 304 is the side oil passage hole, 4 is the sealing element, 401 is the mounting protrusion, 402 is the sealing surface, 5 is the elastic element, 6 is the limiting groove, 7 is the limiting cover, and 701 is the pneumatic profile. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0050] The purpose of this invention is to provide an oil receiving valve to solve the problems existing in the prior art, so that the sealing pressure of the oil receiving valve can be adjusted and the adaptability of the oil tank receiving valve can be improved.

[0051] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] This invention provides an oil receiving valve, comprising a supporting valve body 1, a pressing element 2, and a pressing adjusting element 3. The supporting valve body 1 has an oil inlet 101. The pressing element 2 is slidably disposed within the supporting valve body 1, and a sealing element 4 is disposed on the side of the pressing element 2 near the oil inlet 101, allowing the pressing element 2 to seal the oil inlet 101. The pressing adjusting element 3 is connected to the supporting valve body 1, and their connection position is adjustable. An elastic element 5 is disposed between the pressing adjusting element 3 and the pressing element 2; changing the connection position between the pressing adjusting element 3 and the supporting valve body 1 changes the compression state of the elastic element 5. The pressing adjusting element 3 has an oil passage hole 301; after the sealing element 4 is separated from the oil inlet 101, the oil inlet 101 communicates with the oil passage hole 301.

[0053] When fuel is injected into the fuel tank using the fuel receiving valve of this invention, a force is applied to the clamping element 2 and the sealing element 4. The clamping element 2 compresses the elastic element 5 and slides towards the clamping adjustment element 3. The sealing element 4 separates from the fuel inlet 101, and the fuel receiving valve opens. The fuel introduced through the fuel inlet 101 passes through the fuel passage 301 connected to the fuel inlet 101 and is injected into the fuel tank. After the fuel injection is completed, the force applied to the clamping element 2 and the sealing element 4 is removed. Under the force of the elastic element 5 restoring its deformation, the clamping element 2 and the sealing element 4 reset and re-seal the fuel inlet 101. It should be emphasized that adjusting the connection position between the clamping adjustment element 3 and the supporting valve body 1 can change the compression state of the elastic element 5, thereby adjusting the magnitude of the force pushing the clamping element 2 and the sealing element 4, so that the fuel receiving valve can meet the engineering requirements of different aircraft fuel tanks and improve the adaptability of the fuel receiving valve.

[0054] The clamping adjustment element 3 is threadedly connected to the supporting valve body 1. The clamping adjustment element 3 has an external thread, and the supporting valve body 1 has a matching internal thread. The internal thread section of the supporting valve body 1 is relatively long, facilitating the adjustment of the connection position between the clamping adjustment element 3 and the supporting valve body 1. The threaded connection is secure and easy to adjust. In this specific embodiment, the clamping adjustment element 3 is cylindrical in shape, with a length of 8mm to 12mm, and an external thread specification of M12Х1.25. It is made of 0Cr18Ni9 material. In practical applications, the material and specifications of the clamping adjustment element 3 can be selected according to the actual working conditions.

[0055] For ease of operation, an adjustment groove 302 is provided at the end of the clamping adjustment element 3 away from the elastic element 5. The adjustment groove 302 cooperates with the operating tool to easily drive the clamping adjustment element 3 to rotate and adjust its position. The specific shape and specifications of the adjustment groove 302 can be set according to actual needs to adapt to specific working conditions.

[0056] In practical operation, the elastic element 5 can be a spring, which is easy to replace and inexpensive. In this specific embodiment, a cylindrical spring is selected, and the elastic element 5 can be made of 0Cr18Ni9 material with a wire diameter of 1.0mm to 1.5mm, an outer diameter of 8mm to 9mm, and a surface roughness of not less than Ra0.8μm. The maximum working deformation of the elastic element 5 is 15mm to 20mm. In practical applications, a suitable type of elastic element 5 or a spring of other specifications can be selected according to the specific working conditions.

[0057] To enhance the structural stability of the elastic element 5, both the clamping element 2 and the clamping adjustment element 3 are provided with limiting grooves 6 capable of accommodating the elastic element 5. The limiting grooves 6 of the clamping element 2 and the clamping adjustment element 3 are arranged opposite to each other, and the clamping element 2 and the clamping adjustment element 3 cooperate to fix the elastic element 5. In this specific embodiment, the depth of the limiting groove 6 is 4mm to 5mm and the diameter is 10mm. In other specific embodiments of the present invention, other types of fixing components, such as fixing blocks, pull rings, etc., can be selected according to actual needs to fix both ends of the elastic element 5, prevent the elastic element 5 from being misaligned, and ensure that the elastic element 5 functions properly.

[0058] Specifically, the oil passage 301 includes a central oil passage 303 and side oil passages 304. Both the central oil passage 303 and the side oil passages 304 are connected to the inner cavity of the supporting valve body 1. The central oil passage 303 is coaxially arranged with the pressing adjustment element 3 and is connected to the limiting groove 6. There are multiple side oil passages 304, which are evenly distributed circumferentially around the axis of the limiting groove 6. The oil passage 301 of the present invention includes a central oil passage 303 and side oil passages 304. Fuel injected into the inner cavity of the supporting valve body 1 can enter the central oil passage 303 through the gap between the elastic element 5 and the limiting groove 6, and be injected into the fuel tank through the central oil passage 303. At the same time, fuel entering the inner cavity of the supporting valve body 1 can also be directly injected into the fuel tank through the side oil passages 304. The central oil passage 303 is coaxially arranged with the limiting groove 6, and the side oil passages 304 are evenly distributed circumferentially around the axis of the limiting groove 6, which improves the uniformity of fuel flow. In this specific embodiment, the diameter of the central oil passage 303 is 5mm to 6mm, the diameter of the side oil passage 304 is 1mm, and there are 8 of them. The center diameter of the side oil passage 304 is 12mm. In practical applications, the structure of the pressure adjustment element 3 can be reasonably set according to the oil injection requirements. It is possible to choose to set only the central oil passage 303 or the side oil passage 304, or both at the same time. When the side oil passage 304 is set, the number of side oil passage 304 can be flexibly adjusted to further improve the adaptability of the oil receiving valve.

[0059] More specifically, the clamping element 2 has a sliding surface 201 and a side surface 202. There are two sets of both sliding surfaces 201 and side surfaces 202, and both sets are symmetrically arranged about the axis of the clamping element 2. The sliding surface 201 slidably abuts against the inner wall of the supporting valve body 1. The sliding surface 201 is an arc surface that matches the inner wall of the supporting valve body 1, allowing the clamping element 2 to slide back and forth within the supporting valve body 1, ensuring smooth sliding. The side surface 202 is a plane, and the distance between the two sets of side surfaces 202 is less than the inner diameter of the supporting valve body 1. An oil inlet 203 is provided on the side surface 202. The 03 is connected to the inner cavity of the supporting valve body 1. A gap exists between the side face 202 and the inner wall of the supporting valve body 1. Fuel input through the fuel inlet 101 can directly enter the inner cavity of the supporting valve body 1 through the gap between the side face 202 and the inner wall of the supporting valve body 1, and then be injected into the fuel tank through the fuel passage 301. It should be noted that the radial cross-sectional shape of the sealing element 4 is consistent with the radial cross-sectional shape of the pressing element 2 to ensure smooth fuel passage. Simultaneously, fuel input through the fuel inlet 101 can also enter the limiting groove 6 of the pressing element 2 through the fuel delivery hole 203 on the side face 202, and then enter the inner cavity of the supporting valve body 1. In this invention, after fuel enters through the fuel inlet 101, it can enter the fuel tank through different paths, resulting in good flowability, effectively avoiding blockage, and improving the working reliability of the fuel receiving valve. In addition, in this specific embodiment, the diameter of the oil supply hole 203 is 2.5mm to 3.5mm. In practical applications, it can be adjusted according to the actual working conditions. The number of oil supply holes 203, side surfaces 202 and sliding surfaces 201 can be adjusted to meet different working conditions and improve the adaptability of the oil receiving valve.

[0060] To facilitate installation, the sealing element 4 has a mounting protrusion 401 at the end facing the clamping element 2. The mounting protrusion 401 is annular, and the clamping element 2 has a mounting groove 204 that matches the mounting ring. The mounting protrusion 401 engages with the mounting groove 204, greatly improving the ease of installation. To further facilitate installation positioning, a limiting post 205 is also provided at the end of the clamping element 2 near the oil inlet 101. The mounting groove 204 surrounds the limiting post 205, and the sealing element 4 is fitted onto the outside of the limiting post 205. The diameter of the limiting post 205 is smaller than the diameter of the oil inlet 101. The limiting post 205 facilitates the installation positioning of the sealing element 4 and also facilitates the application of force to the clamping element 2 and the sealing element 4, improving operational convenience.

[0061] In other specific embodiments of the present invention, an annular sealing ridge 102 is provided on the contact surface between the supporting valve body 1 and the sealing element 4. The sealing element 4 has a sealing surface 402, which is planar. The sealing ridge 102 can squeeze the sealing element 4 and abut against the sealing surface 402. When the receiving valve is in a closed state, the pressing element 2 and the sealing element 4 block the oil inlet 101. The sealing ridge 102 squeezes the sealing element 4 to form a sealing pair, blocking the fuel passage. In practical applications, the number of sealing ridges 102 can be set to multiple to further enhance the sealing effect and ensure the sealing reliability of the receiving valve. The sealing ridges 102 are arranged radially at intervals along the oil inlet 101 to form multiple seals. The axial cross section of the sealing ridge 102 is semi-circular, which avoids damage to the sealing element 4 while squeezing it. In practical applications, the number and shape of the sealing ridges 102 can also be adjusted according to specific working conditions to meet different working conditions and improve the flexibility of the receiving valve.

[0062] In this specific embodiment, the sealing element 4 has a thickness of 2.0 mm to 2.5 mm, is made of fluorosilicone WSX-J-401, and the flatness of the sealing surface 402 meets ±0.2 mm, with a surface roughness not exceeding Ra 1.6 μm. In other specific embodiments of the present invention, the operating parameters of the sealing element 4 can be flexibly adjusted to meet different sealing requirements.

[0063] Furthermore, the refueling valve of the present invention also includes a pneumatic cover 7, which is detachably connected to the support valve body 1. The pneumatic cover 7 is located on one side of the fuel inlet 101, and the side of the pneumatic cover 7 away from the fuel inlet 101 has a pneumatic profile 701. When fuel needs to be injected into the fuel tank, the pneumatic cover 7 can be removed for easy operation. After fuel injection is completed, the pneumatic cover 7 is connected to the support valve body 1. It should be emphasized that the pneumatic profile 701 is adapted to the skin of the aircraft to meet the aerodynamic requirements of the aircraft. In order to meet the aerodynamic requirements of different aircraft, there are multiple pneumatic covers 7, and the aerodynamic profile 701 of each pneumatic cover 7 is different to adapt to different aircraft. When the pneumatic cover 7 is connected to the support valve body 1, the pneumatic cover 7 and the support valve body 1 are plugged in for easy disassembly and replacement, improving the adaptability of the refueling valve. In addition, it should be explained that the aerodynamic profile 701 of the pneumatic cover 7 can be sprayed to further meet the aerodynamic requirements of the aircraft.

[0064] The oil receiving valve of the present invention will be further explained and described below through specific embodiments.

[0065] Example 1

[0066] When using the oil receiving valve of this invention, place the supporting valve body 1 on a special tooling in a plumb position with the opening facing upwards and the oil inlet 101 below. Install the sealing element 4 and the clamping element 2 together, ensuring complete axial and shape alignment, with coaxiality and lateral flatness not exceeding 0.05mm. Install the sealing element 4, clamping element 2, and elastic element 5 in the supporting valve body 1 in the following order: Figure 18 As shown, the limiting post 205 falls exactly at the center of the oil inlet 101. A clamping adjustment element 3 is fitted onto the elastic element 5, and a special tool is used to adjust the screw-in depth of the clamping adjustment element 3 by adjusting the groove 302, ensuring that the clamping force of the elastic element 5 meets the engineering requirements.

[0067] For the oil receiving valve in this embodiment, the length of the elastic element 5 is ensured to be 20mm, and the clamping method and structure are as follows. Figure 17 As shown. The assembly of the initially installed sealing element 4 and clamping element 2 is as follows. Figure 19 As shown, the side faces 202 of the sealing element 4 and the clamping element 2 must be aligned, and the misalignment at the joint must not exceed 0.05mm. After adjustment and installation, the oil receiving valve is installed on the oil tank skin using laser welding or adhesive bonding.

[0068] After the structure is installed, the receiving valve is in a closed state, mainly manifested by a change in the surface of the sealing surface 402 on the sealing element 4. Due to the pressure, the sealing ridge 102 on the supporting valve body 1 is pressed into the sealing surface 402 of the sealing element 4, changing the shape of the sealing element 4, forming a sealing pair, and blocking the passage of oil inside and outside the receiving valve.

[0069] When fuel is being added to the fuel tank, external force is used to push the sealing element 4 and the clamping element 2 inward, such as... Figure 20 As shown, the elastic element 5 is simultaneously compressed to 15±2mm. Due to the inward movement of the sealing element 4 by 5±2mm, fuel can be injected into the fuel tank through the fuel inlet 203, and the sealing surface 402 of the sealing element 4 returns to a flat state.

[0070] The structure of the oil receiving valve in another direction that opens the passage is as follows: Figure 21 As shown, the above state is maintained throughout the entire fuel injection process. Since the sealing element 4 and the clamping element 2 are not perfectly circular (the clamping element 2 has a side face 202, and the sealing element 4 has the same radial cross-sectional shape as the clamping element 2), an oil inlet 203 is provided on the side face 202. When the clamping element 2 and the sealing element 4 move inward, fuel injection passages are exposed on both sides. Fuel enters the fuel tank through the fuel injection passages and the oil inlet 203, resulting in three paths for fuel to enter the fuel tank.

[0071] Fuel enters through the filler port 101, passes through the aforementioned filler passage, and finally enters the fuel tank through eight peripheral side filler holes 304, forming a small-hole fuel passage. The fuel passage passes through... Figure 22 As shown. Simultaneously, fuel enters through the filler port 101, passes through the filler passage, flows through the upper and lower fuel inlets 203, and finally enters the fuel tank through the central fuel inlet 303, forming a through-hole fuel path. The fuel path follows the path shown. Figure 23 As shown. Using essentially the same route, the fuel can be selected to tighten the gap between the adjusting element 3 and the tightening element 2, forming a gap oil passage, as shown. Figure 24 As shown.

[0072] After oil filling is completed, install the pneumatic cover 7. Since the internal pressure applied to the clamping element 2 and the sealing element 4 is removed, the elastic element 5 returns to its original length, the sealing pair closes, blocking the fuel overflow passage and achieving the sealing purpose. Finally, select and install the pneumatic cover 7, ensuring that the pneumatic profile 701 meets the requirements.

[0073] Using the refueling valve of this invention, there is no need to manufacture different refueling valves according to the requirements of different models; only the sealing pressure needs to be adjusted to meet the requirements. Furthermore, the entire refueling valve assembly of this invention is embedded inside the fuel tank, eliminating any protruding parts and ensuring stable airflow for the aircraft. In addition, the refueling valve of this invention is equipped with several different pneumatic valves, which are installed on the outer surface. The pneumatic cover 7 conforms to the shape requirements of the aircraft skin and has been coated with a special coating to ensure both aerodynamic shape and compliance with specific requirements.

[0074] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An oil receiving valve, characterized in that, include: A valve body is provided, the valve body having an oil inlet; A clamping element is slidably disposed within the support valve body. A sealing element is disposed on the side of the clamping element near the oil inlet, enabling the clamping element to seal the oil inlet. The sealing element has an annular mounting protrusion at its end facing the clamping element, and the clamping element has a mounting groove that matches the mounting protrusion, engaging with the mounting groove. A limiting post is also disposed at the end of the clamping element near the oil inlet, with the mounting groove surrounding the limiting post. The sealing element is fitted over the limiting post, and the diameter of the limiting post is smaller than the diameter of the oil inlet. A clamping adjustment element is provided, which is connected to the support valve body and the connection position between the two can be adjusted. An elastic element is provided between the clamping adjustment element and the clamping element. Changing the connection position between the clamping adjustment element and the support valve body can change the compression state of the elastic element. The clamping adjustment element has an oil passage hole. After the sealing element is separated from the oil inlet, the oil inlet is connected to the oil passage hole. A pneumatic cover is provided, which is detachably connected to the support valve body. The pneumatic cover is located on one side of the oil inlet. The side of the pneumatic cover away from the oil inlet has a pneumatic profile that is adapted to the skin of the aircraft. There are multiple pneumatic covers. When the pneumatic cover is connected to the support valve body, the pneumatic cover and the support valve body are plugged into each other.

2. The oil receiving valve according to claim 1, characterized in that: The clamping adjustment element is threadedly connected to the support valve body.

3. The oil receiving valve according to claim 2, characterized in that: The end of the clamping adjustment element away from the elastic element is provided with an adjustment groove; The elastic element is a spring.

4. The oil receiving valve according to claim 1, characterized in that: Both the clamping element and the clamping adjustment element are provided with a limiting groove that can accommodate the elastic element, and the limiting groove of the clamping element and the limiting groove of the clamping adjustment element are arranged opposite to each other.

5. The oil receiving valve according to claim 4, characterized in that: The oil passage includes a central oil passage and side oil passages. Both the central oil passage and the side oil passages are connected to the inner cavity of the supporting valve body. The central oil passage is coaxially arranged with the pressing adjustment element and connected to the limiting groove. There are multiple side oil passages, which are evenly distributed circumferentially around the axis of the limiting groove.

6. The oil receiving valve according to claim 1, characterized in that: The clamping element has a sliding surface and a side surface. There are two sets of both the sliding surface and the side surface. The two sets of sliding surfaces and the two sets of side surfaces are symmetrically arranged about the axis of the clamping element. The sliding surface is slidably abutted against the inner wall of the supporting valve body. The sliding surface is an arc surface, and the side surface is a plane. The distance between the two sets of side surfaces is less than the inner diameter of the supporting valve body. An oil supply hole is provided on the side surface, and the oil supply hole is connected to the inner cavity of the supporting valve body.

7. The oil receiving valve according to claim 1, characterized in that: The supporting valve body and the sealing element have an annular sealing ridge on their contact surface. The sealing element has a sealing surface that is flat. The sealing ridge can squeeze the sealing element and abut against the sealing surface.

8. The oil receiving valve according to claim 7, characterized in that: The sealing ridges are multiple in number and are arranged radially at intervals along the oil inlet. The axial cross-section of the sealing ridges is semi-circular.

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