Nitrogen purging and cleaning device for interior of oil tank

Abstract

The utility model discloses a nitrogen purging and cleaning device used in an oil tank. The nitrogen purging and cleaning device comprises an oil tank manhole plugging block plugged in an oil tank manhole, and a nitrogen purging assembly and an oil tank waste gas guide assembly which are respectively arranged in the oil tank manhole plugging block. According to the nitrogen purging and cleaning device, a nitrogen purging and cleaning structure is designed, nitrogen serves as a medium, after the nitrogen is pressurized to the proper air pressure, residual fuel oil waste gas in the aircraft fuel tank and residual impurities on the side wall of the fuel tank are purged, and the effect of cleaning the residual impurities and waste gas in the fuel tank is achieved; the fuel tank waste gas guide assembly can guide the blown waste gas and impurities out of the fuel tank, so that the workload of subsequent manual cleaning is reduced; the problem that fuel oil waste gas in the fuel tank is naturally volatilized due to the fact that the fuel tank needs to be placed for a long time before an existing aircraft fuel tank is cleaned is solved through nitrogen purging, and the work progress of aircraft fuel tank cleaning is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning equipment, in particular to a nitrogen purging cleaning device used inside an oil tank. Background Art

[0002] Cleaning the inside of the fuel tank is an important part of aircraft maintenance. Cleaning can provide clean fuel for aircraft engines and maintain the fuel tank to increase its service life.

[0003] Before cleaning the inside of the fuel tank, the remaining fuel in the tank needs to be drained, but there will still be a small amount of fuel that cannot be completely drained. For this residual fuel, the manhole of the tank is usually opened to allow the residual fuel to evaporate naturally. This process usually takes 1-2 hours, or even longer. The evaporation time undoubtedly slows down the progress of the cleaning work.

[0004] In addition, fuel impurities, small metal debris, etc. will remain on the inner wall of the fuel tank. These impurities are often cleaned manually after the fuel evaporates. Therefore, speeding up the evaporation of fuel is an important step in the cleaning of aircraft fuel tanks. Utility Model Content

[0005] The purpose of the utility model is to provide a wall-mounted boiler that is easy to fix, so as to solve the deficiencies in the background technology. In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] It includes a fuel tank manhole blocking block which blocks the fuel tank manhole, and a nitrogen purge assembly and a fuel tank exhaust gas guide assembly which are respectively arranged inside the fuel tank manhole blocking block;

[0007] The oil tank manhole plugging block includes a styrene-butadiene rubber block sealed in the oil tank manhole, a plurality of manhole inner wall sealing rings arranged on the outer ring surface of the styrene-butadiene rubber block and in contact with the manhole side wall, and a manhole end face sealing ring arranged on the front side wall of the styrene-butadiene rubber block and sealing with the outer end face of the manhole;

[0008] The nitrogen purge assembly includes an air inlet pipe arranged inside the fuel tank manhole blocking block and extending into the fuel tank, and a nitrogen tank whose air outlet end is connected to the air inlet pipe to provide nitrogen inside the fuel tank to exhaust the exhaust gas;

[0009] The oil tank exhaust gas guiding assembly includes a straight pipe installed in the oil tank manhole blocking block and extending into the oil tank, and one end of the straight pipe located outside the oil tank is connected to the external air.

[0010] As a preferred solution of the utility model, the oil tank manhole sealing block also includes an intake port and an exhaust port opened inside the styrene-butadiene rubber block, and the intake port and the exhaust port are respectively matched with the pipe walls of the straight pipe and the intake pipe, wherein rubber rings for sealing the straight pipe and the intake pipe body are installed in the inner cavity side walls of the intake port and the exhaust port.

[0011] As a preferred solution of the utility model, the area of ​​the manhole end face sealing ring is larger than the area of ​​the oil tank manhole, and the back side wall of the manhole end face sealing ring fits with the end face of the oil tank manhole.

[0012] As a preferred solution of the utility model, the nitrogen purge assembly also includes a hose and an exhaust pipe, one end of the hose is connected to the end of the inlet pipe located outside the styrene-butadiene rubber block, one end of the exhaust pipe is connected to the outlet end of the nitrogen tank through a pipe joint, and a valve is provided between the ends of the hose and the exhaust pipe that are close to each other.

[0013] As a preferred solution of the utility model, the fuel tank exhaust guide assembly also includes a conical cover and a connecting pipe, wherein one end of the narrow mouth of the conical cover is connected to one end of the straight pipe located inside the fuel tank, and one end of the wide mouth of the conical cover extends into the interior of the fuel tank to expand the range of collecting exhaust gas.

[0014] As a preferred solution of the utility model, one end of the connecting pipe is connected to the outside air, and the other end is provided with a flange, and the other side of the flange is connected to one end of the straight pipe located outside the oil tank.

[0015] As a preferred solution of the utility model, the gas source pressure of the nitrogen tank is 0.6Mpa-0.8Mpa.

[0016] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0017] The utility model designs a nitrogen purge cleaning structure, uses nitrogen as a medium, and after being pressurized to a suitable pressure, purges the residual fuel waste gas inside the aircraft fuel tank and the residual debris on the side wall of the fuel tank, thereby achieving the effect of cleaning the residual impurities and waste gas inside the fuel tank; and the fuel tank waste gas guide component can also guide the purged waste gas and impurities outside the fuel tank to reduce the workload of subsequent manual cleaning; and the nitrogen purge avoids the problem of placing the fuel tank for a long time to allow the fuel waste gas in the fuel tank to volatilize naturally before the existing aircraft fuel tank cleaning, thereby accelerating the work process of aircraft fuel tank cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the assembled cleaning components for nitrogen purge;

[0020] Figure 2 This is a schematic diagram of a manhole plugging block for a fuel tank;

[0021] Figure 3 is a partial cross-sectional schematic diagram of a nitrogen purge assembly;

[0022] Figure 4 It is a partial cross-sectional schematic diagram of the fuel tank exhaust gas guide assembly.

[0023] Description of reference numerals:

[0024] 1. Fuel tank manhole sealing block; 11. Styrene-butadiene rubber block; 12. Manhole end face sealing ring; 13. Manhole inner wall sealing ring; 14. Inlet port; 15. Exhaust port; 2. Nitrogen purge assembly; 21. Inlet pipe; 22. Hose; 23. Valve; 24. Exhaust pipe; 25. Nitrogen tank; 3. Fuel tank exhaust guide assembly; 31. Straight pipe; 32. Conical cover; 33. Flange; 34. Connecting pipe. DETAILED DESCRIPTION

[0025] In order to more clearly explain and illustrate the technical solution and implementation of the present utility model, several preferred specific embodiments for implementing the technical solution of the present utility model are introduced below.

[0026] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application and use. It should be understood that in all these figures, the same or similar figure numbers indicate the same or similar parts and features. The various figures only schematically represent the concepts and principles of the embodiments of the present disclosure, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present disclosure. Specific parts in specific drawings may use exaggerated methods to illustrate the relevant details or structures of the embodiments of the present disclosure. The various publications, patents and published patent specifications cited herein are incorporated herein by reference in their entirety. The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model.

[0027] Example

[0028] Refer to the instruction manual Figure 1 To Attachment Figure 4 ;

[0029] A nitrogen purge cleaning device for the inside of a fuel tank:

[0030] This embodiment includes:

[0031] A fuel tank manhole blocking block 1 which blocks the fuel tank manhole;

[0032] Nitrogen purge assembly 2;

[0033] Fuel tank exhaust gas guide assembly 3;

[0034] The oil tank manhole plugging block 1 includes a styrene-butadiene rubber block 11 sealed in the oil tank manhole, a plurality of manhole inner wall sealing rings 13 arranged on the outer ring surface of the styrene-butadiene rubber block 11 and in contact with the manhole side wall, and a manhole end face sealing ring 12 arranged on the front side wall of the styrene-butadiene rubber block 11 and sealing with the outer end face of the manhole;

[0035] Specifically, before cleaning the residual fuel exhaust gas inside the fuel tank and the residual impurities on the inner wall, the fuel tank manhole sealing block 1 is inserted into the fuel tank manhole, and the elasticity of the styrene-butadiene rubber block 11 and the multiple manhole inner wall sealing rings 13 are used to form a seal with the manhole inner cavity, and the manhole end face sealing ring 12 seals the positive end face of the manhole, so that gas leakage will not occur during purging.

[0036] The nitrogen purge assembly 2 includes an air inlet pipe 21 disposed inside the fuel tank manhole blocking block 1 and extending into the fuel tank, and a nitrogen tank 25 whose air outlet end is connected to the air inlet pipe 21 to provide nitrogen inside the fuel tank to exhaust the exhaust gas;

[0037] Specifically, nitrogen with a suitable air pressure is provided to the intake pipe 21 through the nitrogen tank 25, and the fuel waste gas remaining after the fuel tank is emptied is squeezed out by filling the fuel tank with nitrogen, thereby avoiding the existing problem of leaving the fuel tank for 1-2 hours to volatilize the residual fuel before cleaning the fuel tank.

[0038] The fuel tank exhaust gas guide assembly 3 includes a straight pipe 31 installed in the fuel tank manhole blocking block 1 and extending to the inside of the fuel tank, and one end of the straight pipe 31 located outside the fuel tank is connected to the external air;

[0039] Specifically, after the residual fuel exhaust gas in the fuel tank is squeezed out by the nitrogen, the impurities contained in the exhaust gas can be discharged from the interior of the fuel tank under the guidance of the straight pipe 31 and the conical cover 32 .

[0040] The fuel tank manhole sealing block 1 also includes an intake port 14 and an exhaust port 15 opened inside the styrene-butadiene rubber block 11, and the intake port 14 and the exhaust port 15 are respectively matched with the pipe walls of the straight pipe 31 and the intake pipe 21, wherein rubber rings for sealing the straight pipe 31 and the intake pipe 21 are installed in the inner cavity side walls of the intake port 14 and the exhaust port 15.

[0041] The area of ​​the manhole end face sealing ring 12 is larger than the area of ​​the oil tank manhole, and the back side wall of the manhole end face sealing ring 12 fits with the end face of the oil tank manhole.

[0042] The nitrogen purge assembly 2 also includes a hose 22 and an exhaust pipe 24. One end of the hose 22 is connected to an end of the air inlet pipe 21 located outside the styrene-butadiene rubber block 11. One end of the exhaust pipe 24 is connected to the gas outlet end of the nitrogen tank 25 through a pipe joint. The gas source pressure of the nitrogen tank 25 is 0.6Mpa-0.8Mpa. A valve 23 is provided between the ends of the hose 22 and the exhaust pipe 24 that are close to each other.

[0043] The fuel tank exhaust guide assembly 3 also includes a conical cover 32 and a connecting pipe 34, wherein the narrow end of the conical cover 32 is connected to the end of the straight pipe 31 located inside the fuel tank, and the wide end of the conical cover 32 extends into the interior of the fuel tank to expand the range of collecting exhaust gas.

[0044] One end of the connecting pipe 34 is connected to the outside air, and the other end is provided with a flange 33 , and the other side of the flange 33 is connected to one end of the straight pipe 31 located outside the oil tank.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connection" and "fixed" should be understood in a broad sense, for example, "connection" can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of this specification, it should be understood that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0047] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A nitrogen purge cleaning device for the inside of a fuel tank, Features: It comprises a fuel tank manhole blocking block (1) which blocks the fuel tank manhole, and a nitrogen purge assembly (2) and a fuel tank exhaust gas guide assembly (3) which are respectively arranged inside the fuel tank manhole blocking block (1); The oil tank manhole sealing block (1) comprises a styrene-butadiene rubber block (11) sealed in the oil tank manhole, a plurality of manhole inner wall sealing rings (13) arranged on the outer ring surface of the styrene-butadiene rubber block (11) and in contact with the manhole side wall, and a manhole end face sealing ring (12) arranged on the front side wall of the styrene-butadiene rubber block (11) and sealing with the outer end face of the manhole; The nitrogen purge assembly (2) comprises an air inlet pipe (21) arranged inside the oil tank manhole blocking block (1) and extending into the oil tank, and a nitrogen tank (25) whose air outlet end is connected to the air inlet pipe (21) to provide nitrogen inside the oil tank to exhaust waste gas; The oil tank exhaust gas guide assembly (3) comprises a straight pipe (31) installed inside the oil tank manhole blocking block (1) and extending into the oil tank, and one end of the straight pipe (31) located outside the oil tank is connected to the external air.

2. A nitrogen purge cleaning device for the inside of a fuel tank according to claim 1, Features: The oil tank manhole sealing block (1) also includes an air intake port (14) and an air exhaust port (15) which are opened inside the styrene-butadiene rubber block (11), and the air intake port (14) and the air exhaust port (15) respectively cooperate with the pipe wall of the straight pipe (31) and the air intake pipe (21), wherein rubber rings for sealing the pipe body of the straight pipe (31) and the air intake pipe (21) are installed in the inner cavity side walls of the air intake port (14) and the air exhaust port (15).

3. A nitrogen purge cleaning device for the inside of a fuel tank according to claim 1, Features: The area of ​​the manhole end face sealing ring (12) is larger than the area of ​​the oil tank manhole, and the back side wall of the manhole end face sealing ring (12) fits the end face of the oil tank manhole.

4. A nitrogen purging and cleaning device for the interior of a fuel tank according to claim 1, Features: The nitrogen purge assembly (2) further comprises a hose (22) and an exhaust pipe (24), one end of the hose (22) being connected to an end of the air inlet pipe (21) located outside the styrene-butadiene rubber block (11), one end of the exhaust pipe (24) being connected to an outlet end of a nitrogen tank (25) via a pipe joint, and a valve (23) being provided between the ends of the hose (22) and the exhaust pipe (24) that are close to each other.

5. A nitrogen purging and cleaning device for the inside of a fuel tank according to claim 1, Features: The oil tank exhaust gas guide assembly (3) also includes a conical cover (32) and a connecting pipe (34), wherein the narrow end of the conical cover (32) is connected to the end of the straight pipe (31) located inside the oil tank, and the wide end of the conical cover (32) extends into the interior of the oil tank to expand the range of collecting exhaust gas.

6. A nitrogen purge cleaning device for the inside of a fuel tank according to claim 5, Features: One end of the connecting pipe (34) is connected to the outside air, and the other end is provided with a flange (33), and the other side of the flange (33) is connected to one end of the straight pipe (31) located outside the oil tank.

7. A nitrogen purge cleaning device for the inside of a fuel tank according to claim 1, Features: The gas source pressure of the nitrogen tank (25) is between 0.6Mpa and 0.8Mpa.

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