Airplane oil drainage device

Abstract

The utility model relates to the technical field of oil drainage of oil tanks, and provides an airplane oil drainage device which is used for ejecting a precipitation valve of an oil outlet to achieve oil drainage and comprises an ejector pin and an oil guide pipe, the ejector pin comprises a pin body and a connecting cylinder, and the pin body is arranged on the inner wall of the connecting cylinder. The lower end of the connecting cylinder and the upper end of the oil guide pipe are sleeved in an abutting mode and connected through screws on the side face. Compared with the prior art, welding is avoided, the ejector pin and the oil guide pipe are convenient to disassemble and assemble, and the ejector pin or the oil guide pipe can be independently replaced if the ejector pin is damaged in the follow-up using process.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank draining technology, and more specifically, to an aircraft fuel draining device. Background Technology

[0002] After completing flight operations, some aircraft need to release the remaining fuel in their fuel tanks, or when the fuel needs to be analyzed physically and chemically.

[0003] Currently, fuel draining operations are mostly achieved by using a fuel draining device to open the valve core of the sediment valve at the bottom of the fuel tank. For example, the prior art disclosed in publication number "CN213200131U" is a fuel draining device for an aircraft fuel system sediment valve, which includes a push rod and a pipe wall. The push rod and the pipe wall adopt a separate design and are fixed together by welding. However, the welding method of the push rod and the pipe wall is not convenient for subsequent maintenance. If there is any damage, the whole thing can only be replaced. Utility Model Content

[0004] The purpose of this invention is to provide an aircraft fuel dumping device to overcome the aforementioned deficiencies in the prior art.

[0005] This utility model is achieved through the following technical solution:

[0006] An aircraft oil draining device is used to drain oil by opening a sedimentation valve at the oil outlet. The oil draining device includes a pin and an oil guide tube. The pin includes a pin body and a connecting cylinder. The pin body is located on the inner wall of the connecting cylinder. The lower end of the connecting cylinder is sleeved against the upper end of the oil guide tube and connected to the side by a screw.

[0007] Optionally, the oil draining device also includes a sealing cylinder, the lower end of which is sleeved against the upper end of the connecting cylinder and connected to the side by screws. The upper end of the sealing cylinder is provided with a first sealing ring for pressing against the bottom of the oil tank to form a sealing pair.

[0008] Optionally, the needle body and the connecting cylinder are integrally formed, and a positioning step is formed between the needle body and the inner wall of the connecting cylinder. The upper end of the oil guide tube is fitted with the inner wall of the connecting cylinder and abuts against the lower end of the positioning step. The lower end of the sealing cylinder is fitted with the inner wall of the connecting cylinder and abuts against the upper end of the positioning step.

[0009] Optionally, a second sealing ring is provided on the top surface between the connecting cylinder and the oil guide pipe, and a third sealing ring is provided on the top surface between the connecting cylinder and the sealing cylinder.

[0010] Optionally, an installation ring is fixedly provided on the outer wall of the oil guide tube, and a connecting part is provided on two symmetrical sides of the installation ring, and a handle is connected to the connecting part.

[0011] Optionally, the handle is rotatably connected to the connecting part, the connecting part is provided with an upper limit surface, and the handle is provided with a lower limit surface. When the lower limit surface abuts against the upper limit surface, the handle is perpendicular to the axis of the oil guide pipe.

[0012] Optionally, the lower end of the oil guide pipe is fitted with an oil outlet hose, which is fixed by a clamp.

[0013] Optionally, the top of the needle body has a spherical structure.

[0014] Optionally, the needle body is provided with a limiting block for hanging on the oil drain port.

[0015] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0016] 1. In this utility model, the connecting sleeve of the ejector pin and the oil guide tube are sleeved together and connected by screws on the side. Compared with the prior art, welding is avoided, making it easy to disassemble and assemble the ejector pin and the oil guide tube. If there is any damage during subsequent use, the ejector pin or the oil guide tube can be replaced separately.

[0017] 2. In this utility model, the first sealing ring at the top of the sealing cylinder can be squeezed with the bottom of the oil tank to form a sealing pair during use, which prevents the oil from leaking along the bottom of the oil tank during the oil discharge process, and also does not cause indentation on the bottom of the oil tank.

[0018] 3. A second sealing ring is provided on the top surface between the connecting cylinder and the oil guide pipe, and a third sealing ring is provided on the top surface between the connecting cylinder and the sealing cylinder. This arrangement prevents oil from leaking from the connection between the connecting cylinder, the oil guide pipe, and the sealing cylinder. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of an aircraft fuel dumping device provided by this utility model;

[0020] Figure 2 A cross-sectional view of an aircraft fuel dumping device provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the ejector pin;

[0022] Figure 4 This is a schematic diagram of a sedimentation valve in the prior art;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure of the bottom wall of the fuel tank;

[0024] Reference numerals: 1-Pin, 101-Pin body, 1011-Spherical structure, 1012-Limiting block, 102-Connecting cylinder, 2-Oil guide tube, 3-Sealing cylinder, 4-First sealing ring, 5-Mounting ring, 6-Handle, 7-Oil outlet hose, 8-Clamp, 9-Bottom wall of oil tank, 901-Oil drain port, 902-Valve seat, 10-Valve, 11-Screw cap, 12-Spring, 13-Rubber pad. Detailed Implementation

[0025] An aircraft fuel draining device is used to drain fuel by using a settling valve at the top of the fuel outlet. As an existing settling valve, [reference needed]. Figure 4 and Figure 5 The system includes a screw cap 11, a spring 12, a rubber pad 13, and a valve 10 with a ball socket at the bottom. The bottom wall 9 of the oil tank is provided with an oil drain port 901, which has an oblong structure. A valve seat 902 is provided at the bottom of the oil drain port 901. The screw cap 11 is threaded to the top of the valve seat 902. The upper end of the valve 10 is slidably connected to the screw cap 11 and closes the oil drain port 901 under the action of the spring 12. The rubber pad 13 is installed on the valve 10 to seal the oil drain port 901.

[0026] refer to Figures 1-3 The oil draining device includes a ejector pin 1 and an oil guide tube 2. The ejector pin 1 includes a needle body 101 and a connecting tube 102. The needle body 101 is located on the inner wall of the connecting tube 102. The lower end of the connecting tube 102 is sleeved against the upper end of the oil guide tube 2 and connected by screws on the side. Compared with the prior art, welding is avoided, making it easy to disassemble and assemble the ejector pin 1 and the oil guide tube 2. If it is damaged during subsequent use, the ejector pin 1 or the oil guide tube 2 can be replaced separately.

[0027] In this embodiment, the oil draining device also includes a sealing cylinder 3. The lower end of the sealing cylinder 3 is sleeved against the upper end of the connecting cylinder 102 and connected to the side by screws. The upper end of the sealing cylinder 3 is provided with a first sealing ring 4. The first sealing ring 4 can form a sealing pair with the bottom of the oil tank during use, preventing oil leakage along the bottom surface of the oil tank during the draining process, and also preventing indentation on the bottom of the oil tank. In practical applications, an annular groove is provided on the inner edge of the top of the sealing cylinder 3, and the first sealing ring 4 is designed in a trumpet shape, with its lower end embedded in the annular groove of the sealing cylinder 3.

[0028] As an alternative, the sealing cylinder 3 and the oil guide pipe 2 are connected to the connecting cylinder 102 in the following manner: the needle body 101 and the connecting cylinder 102 are integrally formed, and a positioning step is formed between the needle body 101 and the inner wall of the connecting cylinder 102. The upper end of the oil guide pipe 2 mates with the inner wall of the connecting cylinder 102 and abuts against the lower end of the positioning step. The lower end of the sealing cylinder 3 mates with the inner wall of the connecting cylinder 102 and abuts against the upper end of the positioning step. Furthermore, a second sealing ring (not shown) is provided on the top surface between the connecting cylinder 102 and the oil guide pipe 2, and a third sealing ring (not shown) is provided on the top surface between the connecting cylinder 102 and the sealing cylinder 3. This arrangement prevents oil leakage from the connection between the connecting cylinder 102 and the oil guide pipe 2 and the sealing cylinder 3. Based on the above, sealing ring grooves are provided on both the top and bottom surfaces of the sealing step. The second sealing ring is installed in the sealing ring groove on the bottom surface of the sealing step, and the third sealing ring is installed in the sealing ring groove on the top surface of the sealing step.

[0029] It is easy to understand that in this embodiment, when the sealing cylinder 3 and the oil guide pipe 2 are sleeved on top of the connecting cylinder 102, the connecting cylinder 102 is on the outside and the sealing cylinder 3 and the oil guide pipe 2 are on the inside. This method is only an option and not a limitation. In other embodiments, the connecting cylinder 102 can be on the inside and the sealing cylinder 3 and the oil guide pipe 2 can be on the outside; or any two can be sleeved on top in any inside-outside order.

[0030] In this embodiment, the top of the needle body 101 is a spherical structure 1011, which can cooperate with the ball socket at the bottom of the valve 10 to prevent it from tilting. Furthermore, the needle body 101 is provided with a limiting block 1012. After the limiting block 1012 extends into the oil tank, it rotates 90 degrees. After being released, it is held in place by the valve 10 by the action of the spring 12 and hung on the oil drain port 901, thereby freeing up manpower and eliminating the need to hold the oil draining device at all times when draining oil.

[0031] In practical applications, different ejector pins 1 can be designed. The distance from the top of the spherical structure 1011 to the limiting block 1012 in different ejector pins 1 is different, thus the insertion depth is different when using different ejector pins 1, thereby changing the oil discharge flow rate. It is easy to understand that for different ejector pins 1, the height of the first sealing ring 4 on the sealing cylinder 3 is also different, just enough to ensure that a reliable seal can be formed by compression with the bottom of the oil tank.

[0032] In this embodiment, an installation ring 5 is fixedly installed on the outer wall of the oil guide pipe 2 (e.g., by bonding or hot-melt welding). The two symmetrical sides of the installation ring 5 are provided with connecting parts, and the connecting parts are connected to handles 6. It is worth noting that the handles 6 are designed to be easy to use as a force application point during operation to push up the sedimentation valve 10, and then rotate the oil discharge device 90 degrees so that the limit block 1012 is hung on the oil discharge port 901.

[0033] Furthermore, in this embodiment, the handle 6 is rotatably connected to the connecting part. The connecting part has an upper limit surface, and the handle 6 has a lower limit surface. When the lower limit surface abuts against the upper limit surface, the handle 6 is perpendicular to the axis of the oil guide tube 2. It is worth noting that, based on this, when the oil draining device is not in use, the handle 6 can hang down naturally under the action of gravity (i.e., in a state parallel to the axis of the oil guide tube 2), thereby reducing the circumferential size of the oil draining device and making it easier to store and preserve.

[0034] In this embodiment, an oil outlet hose 7 is fitted onto the lower end of the oil guide pipe 2. The oil outlet hose 7 is fixed by a clamp 8. In practical applications, the lower end of the oil guide pipe 2 is designed in a pagoda shape. After the oil outlet hose 7 is fitted, the clamp 8 is tightened to fix it onto the oil guide pipe 2. It is easy to understand that the oil outlet hose 7 is designed to facilitate the guidance of oil to the oil receiving container. The actual length of the oil outlet hose 7 can be selected according to actual needs.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An aircraft fuel draining device for draining fuel by pushing open a sedimentation valve at the fuel outlet, the fuel draining device comprising a push pin and a fuel guide pipe, characterized in that, The ejector pin includes a needle body and a connecting cylinder. The needle body is located on the inner wall of the connecting cylinder. The lower end of the connecting cylinder is sleeved against the upper end of the oil guide tube and connected to the side by screws.

2. The aircraft fuel dumping device according to claim 1, characterized in that, The oil draining device also includes a sealing cylinder, the lower end of which is sleeved against the upper end of the connecting cylinder and connected to the side by screws. The upper end of the sealing cylinder is provided with a first sealing ring, which is used to form a sealing pair with the bottom of the oil tank by compression.

3. The aircraft fuel dumping device according to claim 2, characterized in that, The needle body and the connecting cylinder are integrally formed, and a positioning step is formed between the needle body and the inner wall of the connecting cylinder. The upper end of the oil guide tube is fitted with the inner wall of the connecting cylinder and abuts against the lower end of the positioning step. The lower end of the sealing cylinder is fitted with the inner wall of the connecting cylinder and abuts against the upper end of the positioning step.

4. The aircraft fuel dumping device according to claim 3, characterized in that, A second sealing ring is provided on the top surface between the connecting cylinder and the oil guide pipe, and a third sealing ring is provided on the top surface between the connecting cylinder and the sealing cylinder.

5. The aircraft fuel dumping device according to any one of claims 1-3, characterized in that, An installation ring is fixedly provided on the outer wall of the oil guide tube, and a connecting part is provided on two symmetrical sides of the installation ring, and a handle is connected to the connecting part.

6. The aircraft fuel dumping device according to claim 5, characterized in that, The handle is rotatably connected to the connecting part. The connecting part has an upper limit surface, and the handle has a lower limit surface. When the lower limit surface abuts against the upper limit surface, the handle is perpendicular to the axis of the oil guide pipe.

7. The aircraft fuel dumping device according to any one of claims 1-3, characterized in that, The lower end of the oil guide pipe is fitted with an oil outlet hose, which is fixed by a clamp.

8. The aircraft fuel dumping device according to any one of claims 1-3, characterized in that, The top of the needle has a spherical structure.

9. The aircraft fuel dumping device according to any one of claims 1-3, characterized in that, The needle body is equipped with a limiting block for hanging on the oil drain port.

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