A method for oil cleaning of a multi-compartment multi-pipeline cabin

Abstract

The present application relates to a kind of oil cleaning methods of multi-cabin multi-pipeline cabin, belong to cleaning technical field, solve the problem of complex pipeline cabin in prior art being difficult to clean, and the problem of much residual waste.The present application includes the following steps: step 1: cleaning preparation;Step 2: sub-cabin cleaning and whole-cabin cleaning;Step 3: cabin cleaning inspection;Step 4: pipeline cleaning of the cabin to be cleaned;Step 5: pipeline cleaning inspection of the cabin to be cleaned;Step 6: cleaning is completed.The present application can realize the cleaning of large size complex pipeline multi-cabin components completely, with less residual waste, high cleaning efficiency.

Description

Technical Field

[0001] This invention relates to the field of cleaning technology, and in particular to an oil cleaning method for multi-compartment, multi-pipeline compartments. Background Technology

[0002] With the development of integrated structural and functional design in aerospace products, the internal structure of fuel tanks is becoming increasingly complex, increasingly employing closed multi-cavity structures and complex internal piping. Simultaneously, the requirements for controlling foreign matter inside the tank are becoming increasingly stringent. Due to the large volume of the large and complex tank structure, the internal compartments, multi-ribbed structures, and complex piping create cleaning blind spots during the cleaning process. Conventional cleaning methods are insufficient, resulting in significant residue buildup. Summary of the Invention

[0003] Based on the above analysis, the present invention aims to provide an oil cleaning method for multi-compartment, multi-pipeline compartments to solve the problems of difficult cleaning and excessive residue in compartments with complex internal piping.

[0004] The objective of this invention is mainly achieved through the following technical solutions:

[0005] A method for oil cleaning of multi-section, multi-pipeline tanks includes the following steps:

[0006] Step 1: Cleaning preparation;

[0007] Step 2: Compartment cleaning and full compartment cleaning;

[0008] Step 3: Cleaning and inspection of the hull;

[0009] Step 4: Cleaning the pipes in the chamber to be cleaned;

[0010] Step 5: Cleaning and inspection of the pipelines in the chamber to be cleaned;

[0011] Step 6: Cleaning complete.

[0012] Further, step 1 includes the following steps:

[0013] Step 1.1: Secure the chamber to be cleaned to the tooling;

[0014] Step 1.2: The cleaning oil in the oil storage tank of the oil injection equipment is filtered through self-circulation;

[0015] Step 1.3: Connect the oil injection equipment to the tank to be cleaned via pipeline;

[0016] Step 1.4: Fill the entire tank with oil.

[0017] Furthermore, the steps preceding the compartment cleaning and overall compartment cleaning in step 2 are as follows:

[0018] When the oil level in the tank reaches 80%, the cleaning oil inside the tank is returned for cleaning.

[0019] Cleaning oil filling and returning ports are set in the front and rear compartments to form an oil circulation system, which carries out excess material from the compartments.

[0020] Connect the oil return pipe to a filter device so that the oil discharged from the return port can be filtered and then re-injected into the oil storage tank of the oil injection equipment for recycling.

[0021] Furthermore, the specific implementation methods for compartment cleaning and whole-compartment cleaning in step 2 are as follows:

[0022] During compartment cleaning, cleaning oil is added to the front compartment and the rear compartment respectively, and the oil return is formed by the oil inlet and the oil return outlet; the above steps are repeated repeatedly.

[0023] During the compartment cleaning process, the pressure inside the compartment must not exceed 0.05 MPa, and the cleaning flow rate for each oil line is 19-25 L / min.

[0024] During full tank cleaning, add oil to the rear sealing port and return oil to the oil return ports of the front and rear tank cleaning ports; repeat the above steps repeatedly.

[0025] During the whole-tank cleaning process, the pressure inside the tank must not exceed 0.05 MPa, and the cleaning flow rate for each oil line is 23-30 L / min.

[0026] Further, step 3 includes:

[0027] The oil discharged from compartment cleaning and whole-compartment cleaning is measured with a particle analyzer. The particle size of the discharged oil meets ≥NAS7 level, and the oil return is stopped when the number of foreign objects on the tooling filter screen is less than 10 after oil return.

[0028] Furthermore, step 4 specifically includes:

[0029] The cleaning oil enters from the low port of the fourth pipeline, flows through the fourth pipeline and enters the rear end frame, filling the rear end frame. It then enters the skin, flows out from the skin and into the middle frame, enters the third pipeline and the forward compartment from the port of the third pipeline in the middle frame, fills the forward compartment and then enters the second pipeline from the high port of the second pipeline, and finally flows out from the low port of the first pipeline to the rear compartment.

[0030] Furthermore, the chamber to be cleaned includes a front chamber, a rear chamber, a middle frame, and a rear frame;

[0031] The forward compartment has two forward compartment cleaning ports; the two forward compartment cleaning ports are used for adding oil and returning oil during forward compartment cleaning, respectively.

[0032] The aft compartment has two aft compartment cleaning ports; the two aft compartment cleaning ports are used for adding oil and returning oil during aft compartment cleaning, respectively.

[0033] Furthermore, the pipeline includes a first pipeline, a second pipeline, a third pipeline, a fourth pipeline, a fifth pipeline, and a sixth pipeline;

[0034] The third pipe is located in the forward cabin; the second pipe runs through the middle frame, with one end in the forward cabin and the other end in the aft cabin; the first, fourth, fifth, and sixth pipes are located in the aft cabin.

[0035] Furthermore, the pressure conditions for injecting oil into the hull in step 1.4 are as follows:

[0036] The pressure inside the chamber shall not exceed 0.05 MPa.

[0037] Furthermore, an oil cleaning device is adopted for multi-compartment, multi-oil-path compartments.

[0038] Furthermore, step 2 also includes:

[0039] The chamber is swung using a swing mechanism during the cleaning process.

[0040] Furthermore, the specific manner of the oscillation is as follows:

[0041] The cabin is fixed above the frame; the swing mechanism is located on both sides below the frame; the swing mechanism includes a motor and an eccentric shaft; the end of the eccentric shaft is connected to the outermost upper frame of the frame.

[0042] Driven by the motor and eccentric shaft, the frame swings left and right, and the tooling and cabin swing accordingly; the swing angle is ±15°.

[0043] Furthermore, step 2 also includes: during the cleaning process, introducing compressed gas.

[0044] Furthermore, the compressed gas includes 10% liquid nitrogen.

[0045] Furthermore, the injection method for the compressed gas and liquid nitrogen is as follows:

[0046] During the cleaning process, a mixture of compressed gas and liquid nitrogen is introduced into the port of the rear frame of the fifth pipeline.

[0047] Furthermore, the liquid nitrogen filling pressure is: 0.16MPa~0.20MPa during compartment cleaning; and 0.18MPa~0.22MPa during whole-compartment cleaning.

[0048] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0049] (1) This invention utilizes the inherent pipelines within the cabin and employs two methods, cabin cleaning and pipeline cleaning, to clean cabins with multiple sections and multiple pipelines. This solves the problem that some cabins are not cleaned properly during oil cleaning due to multiple sections and multiple pipelines, and that conventional cleaning methods are difficult to use to clean the cabins and leave a lot of residue. This improves cleaning efficiency and cleaning quality.

[0050] (2) In this invention, an oil circuit is formed between the oil injection port and the oil return port to carry out the excess material for cleaning; the oil discharged from the return oil is filtered to the standard and then injected into the tank of the oil injection equipment for multiple cycles, thus saving energy and reducing emissions.

[0051] (3) Compared with the prior art, the present invention is equipped with a swing mechanism of motor and eccentric shaft. The ends of the eccentric shaft are located on the two outermost upper frames of the frame. When the motor rotates, the eccentric shaft rotates, causing the frame and the chamber to swing left and right, so that the cleaning oil in the chamber shakes and collides with the chamber wall and pipe wall, and the excess material stuck to the wall and pipe wall is washed off by the cleaning oil. The excess material is carried out when the oil returns, so that the cleaning of the chamber is more thorough.

[0052] (4) Compared with the prior art, the present invention fills the chamber with compressed gas during the cleaning process. After the compressed gas enters the chamber, it generates airflow, which pushes the cleaning oil to flow faster in the chamber and pipeline system, forming a vortex. This allows the cleaning oil to reach some cleaning dead corners and better flush all parts of the chamber, especially flushing off impurities, oil stains and other pollutants attached to them, thereby improving the quality and efficiency of cleaning.

[0053] (5) Compared with the prior art, the present invention introduces liquid nitrogen during the cleaning process of the chamber. After the liquid nitrogen enters the chamber, it vaporizes, causing the oil to boil and impact the pipe wall and inner wall of the chamber, thereby circulating and carrying out excess materials such as aluminum chips and dust from the cleaning oil, thus enhancing the cleaning effect.

[0054] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0055] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0056] Figure 1 This is a schematic flowchart of a cleaning method according to a specific embodiment;

[0057] Figure 2This is a schematic diagram of the tooling structure in a specific embodiment;

[0058] Figure 3 This is a schematic diagram of the internal piping structure of the cabin in a specific embodiment;

[0059] Figure 4 This is a schematic diagram of the cabin cleaning port and pipe structure in a specific embodiment.

[0060] Figure label:

[0061] 1-Carrier, 11-Front cabin, 111-Front cabin cleaning port, 12-Rear cabin, 121-Rear cabin cleaning port, 13-Middle frame, 14-Rear end frame, 15-Skin, 16-Pipeline, 161-First pipeline, 162-Second pipeline, 163-Third pipeline, 164-Fourth pipeline, 1641-Fourth pipeline low port, 165-Fifth pipeline, 1651-Fifth pipeline port, 166-Sixth pipeline, 1661-Sixth pipeline low port, 1662-Sixth pipeline high port, 2-Support, 21-Tooling, 22-Frame, 23-Swing mechanism. Detailed Implementation

[0062] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0063] A specific embodiment of the present invention discloses an oil cleaning method for multi-section, multi-pipeline hulls, such as... Figure 1 As shown, it includes the following steps:

[0064] Step 1: Cleaning preparation;

[0065] Step 1.1: Secure the cabin 1 to the tooling 21;

[0066] like Figure 2 As shown, the support 2 includes a fixture 21 and a frame 22. The fixture 21 is used to fix the cabin 1, and the frame 22 is placed at the lower part of the fixture 21.

[0067] The number of tooling 21 is set according to the length of the cabin 1. In this embodiment, there are two cabin 1 structures, and the number of tooling 21 is three.

[0068] In this embodiment, the tooling 21 is a retaining ring structure. The tooling 21 with different retaining ring heights is selected according to the height of the lower support surface of the cabin 1.

[0069] Hoist the cabin 1 above the support 2, open the retaining ring, place the cabin 1 on the retaining ring, and insert the locking bolt to fix it.

[0070] Step 1.2: The cleaning oil in the oil storage tank 1 of the oil injection equipment is filtered through self-circulation;

[0071] The oil injection equipment has an oil outlet pipe, an oil inlet pipe, and an oil return pipe. The cleaning oil in the oil storage tank of the oil injection equipment undergoes self-circulation filtration. Specifically, the oil outlet pipe and the oil inlet pipe of the oil injection equipment are connected, and the particle size of the cleaning oil is measured by a particle size analyzer in an online contamination detection system at a frequency of 0.5 hours / time until the particle size is ≥NAS4 level and the detection stops. The oil in oil storage tank 1 is tested by a filter screen at a frequency of 1 hour / time until no visible excess material is found on the filter screen. In this embodiment, the filter screen filtration accuracy is 10μm.

[0072] Step 1.3: Connect the oil injection equipment to the tank 1 to be cleaned via pipeline 16;

[0073] like Figure 3 and Figure 4 As shown, the chamber 1 to be cleaned is divided into a front chamber 11 and a rear chamber 12. The front chamber 11 has two front chamber cleaning ports 111, and the rear chamber 12 has two rear chamber cleaning ports 121. The rear chamber 12 is provided with a rear end frame 14, and a middle end frame 13 is provided between the front chamber 11 and the rear chamber 12. The upper part of the rear chamber 12 is a skin 15, which is connected to the rear end frame 14 and the middle end frame 13.

[0074] The chamber 1 to be cleaned has internal pipes 16, including a first pipe 161, a second pipe 162, a third pipe 163, a fourth pipe 164, a fifth pipe 165, and a sixth pipe 166. The first pipe 161, second pipe 162, third pipe 163, and fourth pipe 164 are inherent internal pipes of the chamber 1. The fifth pipe 165 is used to fill the chamber with a mixed gas, and the sixth pipe 166 is an internal pipe used to check whether the chamber 1 is full of cleaning oil.

[0075] The third pipeline 163 is located in the forward compartment 11. The low inlet of the third pipeline 163 is located at the bottom of the forward compartment 11, and the high inlet of the third pipeline 163 is located on the partition wall between the middle frame 13 and the forward compartment 11. The third pipeline 163 is used to introduce oil from the middle frame 13 into the forward compartment 11.

[0076] The second pipeline 162 passes through the middle frame 13, with one end located in the forward compartment 11 and the other end located in the aft compartment 12. Specifically, the high-pressure port of the second pipeline 162 is in the forward compartment 11, and the low-pressure port is in the aft compartment 12. The second pipeline 162 is used to transport oil from the forward compartment 11 to the aft compartment 12.

[0077] The first pipe 161, the fourth pipe 164, the fifth pipe 165 and the sixth pipe 166 are located in the rear compartment 12.

[0078] The high-pressure port of the first pipe 161 is connected to the low-pressure port of the second pipe 162; the low-pressure port of the first pipe 161 is located at the bottom of the aft compartment 12. The fourth pipe 164 is "U-shaped", and the low-pressure port 1641 of the fourth pipe is located at the bottom of the aft compartment 12 and can extend out of the bottom wall of the aft compartment 12 for oil injection during pipe 16 cleaning; the other end of the pipe is located on the wall of the rear end frame 14 and the aft compartment 12, for sending the cleaning oil of the aft compartment 12 into the rear end frame 14.

[0079] The fifth pipe 165 extends from the outer wall of the rear end frame 14 into the aft compartment 12. The fifth pipe port 1651 is used to input a mixture of compressed gas and liquid nitrogen. The sixth pipe high-pressure port 1662 is located at the top of the aft compartment 12 near the rear end frame 14 and is used to check whether the compartment 1 is filled with cleaning oil. During the check, a transparent pipe is inserted into the sixth pipe high-pressure port 1662. The sixth pipe low-pressure port 1661 is located at the bottom of the aft compartment 12 and can extend out of the bottom wall of the aft compartment 12.

[0080] When connecting pipeline 16, connect the oil inlet pipe of the oil injection equipment to the fifth pipeline port 1651 of the rear end frame 14 of the compartment 1, and connect the exhaust pipe with the pressure sensor to the sixth pipeline port 1661.

[0081] Connect the port and the rear end plug of the fourth pipeline 164 to the oil inlet pipe of the oil injection equipment; one of the front compartment cleaning ports 111 is the oil return port for cleaning the front compartment 11, and one of the rear compartment cleaning ports 121 is the oil return port for cleaning the rear compartment 12, and connect them to the oil return pipe of the oil injection equipment.

[0082] Step 1.4: Fill the entire tank with oil.

[0083] Specifically:

[0084] Open the inlet and outlet oil pipes of all compartments; open the exhaust pipe connected to the sixth pipeline 166, control the pressure inside the compartment to not exceed 0.05MPa, and carry out full-compartment oil filling.

[0085] Because the sixth pipeline high-pressure port 1662 is located at the highest point of compartment 1, the sixth pipeline high-pressure port 1662 is inserted into a transparent tube that extends out of the compartment wall. Only the sixth pipeline 166 exhaust pipe is opened, while other nozzles and oil filling / draining ports are closed. During oil filling, oil is injected through one of the forward compartment cleaning ports 111 to fill the forward compartment 11. Oil is injected through one of the aft compartment cleaning ports 121 to fill the aft compartment 12. Because the high-pressure port of the third pipeline 163 in the forward compartment 11 is located at its high end, when the forward compartment 11 is full of oil, oil flows from the high-pressure port of the third pipeline 163 to the middle frame 13, the rear frame 14, and the aft compartment 12. When oil flows from the sixth pipeline high-pressure port 1662, it indicates that the entire compartment 1 is 80% full of oil, and oil filling stops.

[0086] Step 2: Compartment cleaning and full compartment cleaning;

[0087] The cleaning of hull 1 is divided into compartment cleaning and whole-hull cleaning. The cleaning method for hull 1 is oil return cleaning.

[0088] Oil return cleaning involves setting up a cleaning oil filling port and a cleaning oil return port to form an oil circulation system, which carries out excess material from the compartment 1 through circulation.

[0089] To improve cleaning efficiency, when the oil level in compartment 1 reaches 80% after a certain cleaning time, the cleaning oil inside compartment 1 is returned to the tank.

[0090] The returned oil is filtered and then re-injected into the oil storage tank of the oil injection equipment for reuse.

[0091] In this embodiment, an oil circulation circuit is formed between the oil inlet and the oil return outlet to carry out excess material for cleaning; the returned oil is filtered to the standard and then injected into the oil storage tank of the oil injection equipment for multiple cycles, thus saving energy and reducing emissions.

[0092] Step 2.1.1: Compartment cleaning;

[0093] The cleaning process involves adding cleaning oil to the front compartment 11 and the rear compartment 12 separately, with the oil inlet and outlet forming an oil circulation circuit. During the cleaning process, the pressure inside compartment 1 is kept below 0.05 MPa, and the cleaning flow rate for each oil circuit is 19-25 L / min.

[0094] The specific cleaning method for compartment cleaning is as follows:

[0095] The oil inlet of the forward compartment 11 is the forward compartment cleaning port 111 for adding cleaning oil, and the oil return port of the forward compartment 11 is another forward compartment cleaning port 111. The oil inlet and oil return ports of the forward compartment 11 form an oil circulation circuit to carry out excess material in the forward compartment 11.

[0096] The oil inlet of the aft compartment 12 is the aft compartment cleaning port 121 for adding cleaning oil, and the oil return port of the aft compartment 12 is another aft compartment cleaning port 121. The oil inlet and oil return ports of the aft compartment 12 form an oil circulation circuit to carry out excess material in the aft compartment 12.

[0097] Repeat the above steps to perform multiple cleaning cycles.

[0098] Because the chamber 1 is large and complex, with numerous compartments and multi-ribbed structures inside, there are many cleaning dead spots between the walls of chamber 1 and the ribbed structures, between chamber 1 and the walls of pipe 16, and on the walls of chamber 1. Relying solely on the cleaning oil's own gravity or the pump's delivery to circulate within the chamber 1 and in pipe 16 is insufficient to remove excess material. Therefore, this embodiment uses a swing mechanism 23 to swing the cleaning chamber 1 during the cleaning process, causing the cleaning oil to slosh inside the chamber 1, colliding with the chamber walls, pipe walls, ribbed structures, and dead spots, thus carrying away excess material from these areas.

[0099] Specifically, taking into account the weight of tooling 21 and cabin 1, the swing angle is ±15°.

[0100] The swaying pattern of cabin 1 is as follows:

[0101] The support frame 2 includes a fixture 21, a frame 22, and a swing mechanism 23. The cabin 1 is fixed above the frame 22. Two swing mechanisms 23 are provided, respectively located on both sides below the frame 22. The swing mechanism 23 includes a motor and an eccentric shaft. The ends of the two eccentric shafts are respectively connected to the outermost upper frame of the frame 22. The eccentric shafts are mounted on the main shaft of the motor. When the eccentric shafts rotate, they drive the frame 22 to swing, and the fixture 21 and cabin 1 on the upper part of the frame 22 swing accordingly.

[0102] Compared with the prior art, this embodiment is provided with a swing mechanism 23 consisting of a motor and an eccentric shaft. The ends of the eccentric shaft are located on the two outermost upper frames of the frame 22. When the motor rotates, the eccentric shaft rotates, causing the frame 22 and the chamber 1 to swing left and right, causing the cleaning oil in the chamber 1 to slosh and collide with the walls of the chamber 1 and the pipe walls. The excess material adhering to the walls and pipe walls is washed off by the cleaning oil, and the excess material is carried out during oil return, making the cleaning of the chamber 1 more thorough.

[0103] Furthermore, during the cleaning process, compressed gas is introduced from the external port 1651 of the fifth pipeline.

[0104] Compared with the prior art, this embodiment introduces compressed gas during the cleaning process of the chamber 1. After the compressed gas enters the chamber 1, it generates airflow, which pushes the cleaning oil to flow more quickly in the chamber 1 and the pipeline 16 system, forming a vortex. This allows the cleaning oil to reach some cleaning dead corners and better flush all parts of the chamber 1, especially flushing off impurities, oil stains and other contaminants attached to them, thereby improving the quality and efficiency of cleaning.

[0105] Furthermore, in this embodiment, the compressed gas contains 10% liquid nitrogen.

[0106] Compared with the prior art, this embodiment introduces liquid nitrogen into the cleaning chamber 1 during the cleaning process. After entering the chamber 1, the liquid nitrogen vaporizes, causing the oil to boil and impact the pipe wall and inner wall of the chamber 1, thus circulating and carrying away excess materials such as aluminum shavings and dust from the cleaning oil, thereby improving the cleaning effect.

[0107] It should be noted that the nitrogen pressure during compartment cleaning is 0.16MPa~0.20MPa.

[0108] Step 2.1.2: Full tank oil return cleaning.

[0109] During full-tank cleaning, oil is added to the rear sealing port and returned to the front tank cleaning port 111 and the rear tank cleaning port 121.

[0110] The oil inlet and outlet form an oil circulation system, which removes excess material from compartment 1. During the cleaning process, the pressure inside compartment 1 is kept below 0.05 MPa, and the cleaning flow rate for each oil circuit is 23-30 L / min.

[0111] Repeat the above process multiple times for thorough cleaning.

[0112] Similar to compartment cleaning, in whole-compartment cleaning, the swing mechanism 23 on both sides of the frame 22 connected by a motor and an eccentric shaft is used to swing the compartment 1; during the cleaning process, compressed gas containing 10% liquid nitrogen is introduced into the compartment 1.

[0113] It should be noted that the nitrogen pressure during the whole-cabin cleaning is 0.18MPa~0.22MPa.

[0114] Step 3: Cleaning and inspection of hull 1;

[0115] During either compartment cleaning or full-compartment cleaning, compartment 1 must undergo multiple oil return cleaning processes. A cleaning inspection should be performed after a period of time. During the inspection, the returned oil should be measured using a particle analyzer. The cleaning should stop when the particle size of the returned oil meets or exceeds NAS7 level, and the number of foreign objects on the filter screen is less than 10 after oil return.

[0116] Step 4: Cleaning of pipe 16;

[0117] The interior of the cabin 1 is a compartmentalized structure with multiple pipes 16. After the cabin 1 is cleaned, the pipes 16 need to be cleaned as well.

[0118] Because there are many small-diameter oil passages in the compartment 1, in order to prevent the slow oil speed from causing high pressure in the pipeline 16 and the risk of bursting, this embodiment increases the diameter of the oil outlet when cleaning the pipeline 16 compared to cleaning the compartment 1, so as to speed up the cleaning speed and reduce the pressure in the pipeline 16.

[0119] Specifically, the cleaning path for pipe 16 is as follows:

[0120] Since the fifth pipe 165 is used for compressed air filling and the sixth pipe 166 is only used as an indicator of whether the oil filling in the compartment 1 is full, neither the fifth pipe 165 nor the sixth pipe 166 needs to be cleaned. Therefore, in this embodiment, only the first pipe 161, the second pipe 162, the third pipe 163, and the fourth pipe 164 are cleaned.

[0121] The flow path of the cleaning oil during cleaning is as follows: it enters from the low port 1641 of the fourth pipeline, flows through the fourth pipeline 164 and enters the rear end frame 14, fills the rear end frame 14, enters the skin 15, flows out from the skin 15 and enters the middle frame 13, enters the third pipeline 163 from the port of the third pipeline 163 of the middle frame 13, and enters the front compartment 11, fills the front compartment 11 and enters the second pipeline 162 from the high port of the second pipeline 162, and finally flows out from the low port of the first pipeline 161 to the rear compartment 12.

[0122] When cleaning pipeline 16, it is necessary to use the swing mechanism 23 to shake the chamber 1.

[0123] Step 5: Cleaning and inspection of pipe 16;

[0124] After pipeline 16 is cleaned, the discharged oil in the return oil is filtered multiple times. The cleaning is stopped when the cleanliness meets the following conditions: 22 particles per milliliter of 50-100 micrometers, 126 particles per milliliter of 25-50 micrometers, 712 particles per milliliter of 15-25 micrometers, and 4000 particles per milliliter of 5-15 micrometers.

[0125] Step 6: Cleaning complete.

[0126] This embodiment utilizes the inherent pipeline 16 within the compartment 1, employing both compartment 1 cleaning and pipeline 16 cleaning methods. During the cleaning process, the compartment 1 is oscillated by the swing mechanism 23, compressed gas is injected to generate vortices and accelerate the oil speed, and liquid nitrogen is injected to make the oil boil and remove excess material. This solves the problem that some compartments 1 are not thoroughly cleaned during the oil cleaning process due to the compartment structure and multiple pipelines, and that conventional cleaning methods cannot guarantee the cleaning quality requirements of compartment 1, thus improving cleaning efficiency and cleaning quality.

[0127] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for oil cleaning of multi-compartment, multi-pipeline tanks, characterized in that, Includes the following steps: Step 1: Cleaning preparation; Step 2: Compartment cleaning and full compartment cleaning; Step 3: Cleaning and inspection of the hull; Step 4: Cleaning the pipes (16) of the chamber (1) to be cleaned; Step 5: Cleaning and inspection of the pipelines (16) of the chamber to be cleaned (1); Step 6: Cleaning complete; The chamber to be cleaned (1) includes a front chamber (11), a rear chamber (12), a middle frame (13), and a rear frame (14); the front chamber (11) has two front chamber cleaning ports (111); the two front chamber cleaning ports (111) are used for adding oil and returning oil during the cleaning of the front chamber (11); the rear chamber (12) has two rear chamber cleaning ports (121); the two rear chamber cleaning ports (121) are used for adding oil and returning oil during the cleaning of the rear chamber (12). The rear cabin (12) is provided with a rear end frame (14), and a middle end frame (13) is provided between the front cabin (11) and the rear cabin (12); the upper part of the rear cabin (12) is a skin (15), and the skin (15) communicates with the rear end frame (14) and the middle end frame (13); The pipeline (16) includes a first pipeline (161), a second pipeline (162), a third pipeline (163), a fourth pipeline (164), a fifth pipeline (165), and a sixth pipeline (166); the third pipeline (163) is located in the front compartment (11); the second pipeline (162) passes through the middle frame (13), with one end of the second pipeline (162) located in the front compartment (11) and the other end located in the rear compartment (12); the first pipeline (161), the fourth pipeline (164), the fifth pipeline (165), and the sixth pipeline (166) are located in the rear compartment (12); In step 4, the cleaning oil enters from the low port of the fourth pipe (164), flows through the fourth pipe (164) and enters the rear end frame (14), filling the rear end frame (14), entering the skin (15), flowing out from the skin (15) and entering the middle end frame (13), entering the third pipe (163) and the front compartment (11) from the port of the third pipe (163) of the middle end frame (13), filling the front compartment (11), entering the second pipe (162) from the high port of the second pipe (162), and finally flowing out from the low port of the first pipe (161) to the rear compartment (12).

2. The oil cleaning method for multi-compartment, multi-pipeline hulls according to claim 1, characterized in that, Step 1 includes the following steps: Step 1.1: Fix the chamber (1) to be cleaned to the tooling (21); Step 1.2: The cleaning oil in the oil storage tank of the oil injection equipment is filtered through self-circulation; Step 1.3: Connect the oiling equipment to the tank to be cleaned (1) via pipeline; Step 1.4: Fill the entire tank with oil.

3. The oil cleaning method for multi-compartment, multi-pipeline hulls according to claim 1, characterized in that, The steps preceding the compartment cleaning and full compartment cleaning in step 2 are as follows: When the oil level in the tank reaches 80%, the cleaning oil inside the tank is returned for cleaning. Cleaning oil filling ports and cleaning oil return ports are set in the front compartment (11) and the rear compartment (12) to form an oil circulation system, which carries out excess material in the compartment through circulation; Connect the oil return pipe to a filter device so that the oil discharged from the return port can be filtered and then re-injected into the oil storage tank of the oil injection equipment for recycling.

4. The oil cleaning method for multi-compartment, multi-pipeline tanks according to claim 3, characterized in that, The specific implementation methods for compartment cleaning and whole-compartment cleaning in step 2 are as follows: During compartment cleaning, cleaning oil is added to the front compartment (11) and the rear compartment (12) respectively, and the oil return is formed by the oil inlet and the oil return outlet; the above steps are repeated repeatedly. During the compartment cleaning process, the pressure inside the compartment must not exceed 0.05 MPa, and the cleaning flow rate for each oil line is 19-25 L / min. During full tank cleaning, add oil to the rear sealing port and return oil to the oil return ports of the front tank cleaning port (111) and the rear tank cleaning port (121); repeat the above steps. During the whole-tank cleaning process, the pressure inside the tank does not exceed 0.05 MPa, and the cleaning flow rate of each oil line is 23-30 L / min.

5. The oil cleaning method for multi-compartment, multi-pipeline hulls according to claim 1, characterized in that, Step 3 includes: The oil discharged from compartment cleaning and whole-compartment cleaning is measured with a particle analyzer. The particle size of the discharged oil meets ≥NAS7 level, and the oil return is stopped when the number of foreign objects on the filter screen is less than 10 after oil return.

6. The oil cleaning method for multi-compartment, multi-pipeline hulls according to claim 2, characterized in that, The pressure conditions for injecting oil into the tank in step 1.4 are as follows: The pressure inside the chamber shall not exceed 0.05 MPa.

7. The oil cleaning method for multi-compartment, multi-pipeline hulls according to any one of claims 1-6, characterized in that, An oil cleaning device is used for multi-compartment, multi-pipeline compartments.

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