An oil flushing and purification system for the engine room stern tube

Abstract

The present invention discloses a purifying system for the oil flushing of the engine room stern tube. The present invention respectively includes an oil storage tank and a tail shaft tube system, and further includes a sedimentation tank, an air cleaning pump, a flushing oil tank and a purifier. The purifier is supplied with oil from the sedimentation tank. One end of the clean oil outlet of the purifier is fixedly communicated with the oil storage tank. The tail shaft tube system is supplied with oil from the oil storage tank. One end of the oil outlet of the flushing oil tank is respectively communicated with the tail shaft tube system and the purifier. One end of the sewage outlet of the purifier is communicated with the sedimentation tank. One end of the air outlet of the air cleaning pump is communicated with the purifier. The purifier includes a purification tank assembly. The inner wall of the purification tank assembly is rotatably connected with a sewage cleaning assembly. The inner wall of the sewage cleaning assembly is rotatably connected with a filtering assembly. Through the arrangement of structures such as the sedimentation tank, the purifier, and the flushing oil tank, the present invention enables the device to efficiently complete the oil supply operation of the stern tube in the marine engine room, and when the device is performing the oil circuit supply operation, an oil flushing and purifying mechanism for the oil supply system is added.

Description

Technical Field

[0001] The present invention relates to the technical field of ship purification systems, and more specifically, to a stern tube series oil purification system for engine rooms. Background Art

[0002] The fuel oil used in ships is very low-quality and dirty oil, such as diesel or heavy oil, which is the final asphalt-like residue after extracting various useful chemicals from crude oil. Because of its low price, it brings great economic benefits to ship operation. However, its use must rely on the purification of oil products to remove impurity particles.

[0003] In the prior art, the patent document with the publication number CN111776189A discloses a ship fuel oil intelligent purification system including a first fuel storage tank, a second fuel storage tank, a first fuel sedimentation tank, a second fuel sedimentation tank, a first main engine daily use oil tank, a second main engine daily use oil tank, a first auxiliary engine daily use oil tank, a second auxiliary engine daily use oil tank, and an oil residue tank. The first fuel storage tank is connected to the first fuel sedimentation tank through a first pipeline. The complex operation process and special technological process of ship fuel oil purification are programmed and intelligentized. However, the above system cannot effectively flush the fuel supply pipeline or related compartments during operation. At the same time, the existing purification system cannot effectively reuse the flushing oil liquid during the purification process, so the loss degree of the oil liquid is relatively high. Based on this, the present invention provides a stern tube series oil purification system for engine rooms to solve the problems raised in the above background art. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a stern tube series oil purification system for engine rooms. Through the settings of structures such as a sedimentation tank, a purifier, and a flushing oil tank, the present device can efficiently complete the fuel supply operation of the stern tube in the ship engine room, and when the device is operating in the oil supply operation, a series oil purification mechanism for the fuel supply system is added.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions. The technical solutions adopted by a stern tube series oil purification system for engine rooms are as follows: It respectively includes a fuel storage tank and a tail shaft tube system, and also includes a sedimentation tank, an air cleaning pump, a flushing oil tank, and a purifier. The purifier is supplied with oil from the sedimentation tank. One end of the purified oil outlet of the purifier is fixedly connected to the fuel storage tank. The tail shaft tube system is supplied with oil from the fuel storage tank. One end of the oil outlet of the flushing oil tank is respectively connected to the tail shaft tube system and the purifier. One end of the sewage outlet of the purifier is connected to the sedimentation tank. One end of the air outlet of the air cleaning pump is connected to the purifier;

[0008] The purifier includes a tank assembly, the inner wall of the tank assembly is rotatably connected to a cleaning assembly, the inner wall of the cleaning assembly is rotatably connected to a filter assembly, and the inner wall of the filter assembly is rotatably connected to a recoil assembly connected to an air cleaning pump and a series washing oil tank.

[0009] As a preferred solution, the surface of the sedimentation tank is fixedly connected with an oil inlet pipe, a sampling pipe and a sewage main pipe, and a first solenoid valve is provided at the connection points between the oil inlet pipe, the sampling pipe and the sewage main pipe and the sedimentation tank. Liquid level probes are installed inside the sedimentation tank and the oil storage tank.

[0010] As a preferred solution, a pump body is provided at the connection point between the purifier and the sedimentation tank, the connection point between the stern tube system and the oil storage tank, the connection point between the series washing oil tank and the purifier, and the connection point between the purifier and the oil storage tank. A second solenoid valve is provided at the connection point between the series washing oil tank, the stern tube system and the purifier, and the connection point between the oil storage tank and the sedimentation cabin. The series washing oil tank, the oil storage tank, the purifier and the sedimentation tank are arranged in sequence from top to bottom inside the system.

[0011] As a preferred embodiment, the tank body assembly includes a purification tank, a servo motor is fixedly installed on the peripheral side of the purification tank, three active bevel gears are installed on the output shaft end of the servo motor, a sewage separation pipe is fixedly installed on the side of the purification tank, a group of sewage separation spray holes distributed in a linear array and horizontally arranged are opened inside the sewage separation pipe, and a sewage branch pipe and a clean oil discharge pipe are fixedly connected to the bottom of the purification tank, respectively, the other end of the sewage branch pipe is connected to the sedimentation tank, and the other end of the clean oil discharge pipe is connected to the oil storage tank, and the sewage cleaning assembly, the filter assembly and the recoil assembly are all driven by a servo motor.

[0012] As a preferred solution, flow meters are installed inside the sewage separation pipe and the clean oil discharge pipe.

[0013] As a preferred embodiment, the cleaning component includes an outer rotating cylinder, the peripheral side surface of the outer rotating cylinder is rotatably connected to the purification tank, a spiral cleaning sheet is fixedly installed on the bottom of the outer rotating cylinder, a group of reinforcing rods vertically arranged and fixedly connected to the spiral cleaning sheet are fixedly installed on the bottom of the outer rotating cylinder, and a first driven bevel gear ring connected to the servo motor is fixedly installed on the top of the outer rotating cylinder.

[0014] As a preferred embodiment, the filter assembly includes a filter rotor, the peripheral side surface of the filter rotor is rotatably connected to the outer rotor, the inner wall of the filter rotor is provided with a plurality of groups of filter mesh holes distributed in a circumferential array, the filter mesh holes are arranged horizontally, the inner wall of the spiral cleaning sheet is rotatably fitted with the filter rotor, the bottom of the filter rotor is fixedly connected to an oil drain hopper, the bottom end of the oil drain hopper is rotatably connected to a clean oil drain pipe, and the top of the filter rotor is fixedly installed with a second driven bevel gear ring connected to a servo motor.

[0015] As a preferred embodiment, a group of rubber brush strips distributed in a linear array are fixedly installed on the inner wall of the spiral cleaning piece, and the inner walls of a group of rubber brush strips are rotatably fitted with the filter drum. The filter drum is a hollow cylindrical structure with a closed top and an open bottom.

[0016] As a preferred embodiment, the recoil assembly comprises a recoil shaft tube and a connecting pipe respectively, the circumferential side surface of the connecting pipe is fixedly connected to the purification tank, the two ends of the connecting pipe are fixedly connected with an air intake pipe and an oil washing inlet pipe respectively, flow control valves are installed inside the air intake pipe and the oil washing inlet pipe, one end of the air inlet of the intake pipe is fixedly connected to the air cleaning pump, one end of the oil inlet of the oil washing inlet pipe is fixedly connected to the series washing oil tank, the circumferential side surface of the recoil shaft tube is rotatably connected to the filter rotor, the top of the recoil shaft tube is fixedly installed with a third driven bevel gear ring connected to the servo motor transmission, the inner wall of the recoil shaft tube is provided with a plurality of groups of recoil spray holes distributed in a circular array and arranged horizontally, the circumferential side surface of the recoil shaft tube is fixedly installed with a spiral oil pressure sheet, and the circumferential side surface of the spiral oil pressure sheet is rotatably fitted with the filter rotor.

[0017] As a preferred embodiment, the recoil shaft tube is a hollow tubular structure with a closed top and an open bottom, the aperture of the recoil spray hole is 3-10 times the aperture of the filter mesh, and the aperture of the recoil spray hole is 0.1-0.3 times the aperture of the sewage separation spray hole.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a cabin stern pipe oil purification system, which has the following beneficial effects:

[0020] 1. The present invention can efficiently complete the oil supply operation of the stern pipe in the marine engine room by setting up the structures such as the sedimentation tank, the purifier, and the series washing oil tank. In addition, when the oil supply operation is performed on the oil line, the series washing oil tank adds a series oil purification mechanism for the oil supply system. When it is necessary to clean the relevant oil pipelines or oil-using equipment inside the system, the series washing oil tank can efficiently clean the above pipelines and oil-using equipment through the backwashing and reverse series washing principles. In addition, the recovery structure of the sedimentation tank can effectively reduce the loss rate of the series washing oil during cleaning. By reducing the above loss rate, the purification cost of the purification system is reduced. At the same time, the upper structure of the series washing oil tank can effectively improve the series washing efficiency of the purification system and save labor costs.

[0021] 2. The present invention can efficiently complete the purification operation of marine oil through the setting of the purifier, and can automatically discharge or compress the filtered oil during the purification operation. Moreover, through the setting of the recoil component, high-pressure gas, high-pressure oil and centrifugal principle can be used to perform rapid recoil self-maintenance cleaning on the filtering mechanism inside the purifier. By achieving the above technical effects, the use cost and maintenance difficulty of the system are effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic flow structure diagram of an oil purifying system for a stern tube of an engine room according to the present invention;

[0023] Figure 2 FIG. 2 is a schematic structural diagram of a purifier according to the present invention;

[0024] Figure 3 FIG. 3 is a schematic cross-sectional structure diagram of the present invention Figure 2 ;

[0025] Figure 4 FIG. 4 is a schematic enlarged partial structure diagram of part A in the present invention Figure 3 ;

[0026] Figure 5 FIG. 5 is a schematic enlarged partial structure diagram of part B in the present invention Figure 3 ;

[0027] Figure 6 FIG. 6 is a schematic structural diagram of an outer rotating cylinder and a reinforcing rod according to the present invention;

[0028] Figure 7 FIG. 7 is a schematic structural diagram of a filtering rotating cylinder according to the present invention;

[0029] Figure 8 FIG. 8 is a schematic structural diagram of a backwashing shaft tube and backwashing spray holes according to the present invention.

[0030] In the figures: 1, oil storage tank; 2, tail shaft tube system; 3, sedimentation tank; 4, air purification pump; 5, flushing oil tank; 6, purifier; 7, oil inlet pipe; 8, sampling pipe; 9, sewage main pipe; 10, first solenoid valve; 11, liquid level probe; 12, pump body; 13, second solenoid valve; 14, purification tank; 15, servo motor; 16, oil separation pipe; 17, sewage branch pipe; 18, purified oil discharge pipe; 19, outer rotating cylinder; 20, spiral cleaning blade; 21, reinforcing rod; 22, filtering rotating cylinder; 23, filtering mesh hole; 24, oil discharge hopper; 25, rubber brush strip; 26, backwashing shaft tube; 27, connecting pipe; 28, air inlet pipe; 29, washing oil inlet pipe; 30, backwashing spray hole; 31, spiral oil pressing piece. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention will be further described and explained below with reference to specific embodiments and the accompanying drawings of the specification:

[0032] Please refer to Figures 1-8 , a stern tube oil purifying system for an engine room according to the present invention: includes an oil storage tank 1 and a tail shaft tube system 2 respectively. The oil storage tank 1 is used for storing daily oil in this system. The tail shaft tube system 2 is the stern tube of the ship's engine room. The tail shaft tube system 2 is an existing marine component and will not be elaborated here;

[0033] It also includes a sedimentation tank 3, an air cleaning pump 4, a flushing oil tank 5 and a purifier 6;

[0034] An oil inlet pipe 7, a sampling pipe 8 and a sewage main pipe 9 are respectively and fixedly connected to the surface of the sedimentation tank 3. First electromagnetic valves 10 are arranged at the connection points of the oil inlet pipe 7, the sampling pipe 8 and the sewage main pipe 9 with the sedimentation tank 3. Liquid level probes 11 are installed inside both the sedimentation tank 3 and the oil storage tank 1;

[0035] The functions of the liquid level probes 11 in the sedimentation tank 3 and the oil storage tank 1 are respectively to monitor the oil level height inside the sedimentation tank 3 and the oil level height inside the oil storage tank 1. The model of the liquid level probe 11 is BRYW - 101;

[0036] The function of the oil inlet pipe 7 is for the supply operation of the oil. The function of the sampling pipe 8 is to sample the oil inside the sedimentation tank 3, and then analyze the sedimentation degree of the oil in the sedimentation tank 3. The function of the sewage main pipe 9 is to discharge the oil stains inside the sedimentation tank 3;

[0037] The purifier 6 is supplied with oil from the sedimentation tank 3. One end of the purified oil outlet of the purifier 6 is fixedly connected to the oil storage tank 1. The tail shaft tube system 2 is supplied with oil from the oil storage tank 1. One end of the oil outlet of the flushing oil tank 5 is respectively connected to the tail shaft tube system 2 and the purifier 6. One end of the sewage outlet of the purifier 6 is connected to the sedimentation tank 3. One end of the air outlet of the air cleaning pump 4 is connected to the purifier 6;

[0038] The flushing oil tank 5, the oil storage tank 1, the purifier 6 and the sedimentation tank 3 are arranged in sequence from top to bottom inside the system;

[0039] Through the above - mentioned arrangement positions of the flushing oil tank 5, the oil storage tank 1, the purifier 6 and the sedimentation tank 3, the flushing efficiency of the flushing oil tank 5 is improved, and the labor cost is saved;

[0040] Pump bodies 12 are arranged at the connection points of the purifier 6 with the sedimentation tank 3, the connection points of the tail shaft tube system 2 with the oil storage tank 1, the connection points of the flushing oil tank 5 with the purifier 6, and the connection points of the purifier 6 with the oil storage tank 1. Second electromagnetic valves 13 are arranged at the connection points of the flushing oil tank 5 with the tail shaft tube system 2 and the purifier 6, and the connection points of the oil storage tank 1 with the sedimentation tank 3;

[0041] The purifier 6 includes a tank body assembly. A dirt - cleaning assembly is rotatably connected to the inner wall of the tank body assembly. A filtering assembly is rotatably connected to the inner wall of the dirt - cleaning assembly. A back - flushing assembly connected to the air cleaning pump 4 and the flushing oil tank 5 is rotatably connected to the inner wall of the filtering assembly.

[0042] The tank assembly includes a purification tank 14, on the peripheral side of which a servo motor 15 is fixedly mounted, and three active bevel gears are mounted on the output shaft end of the servo motor 15. A sewage separation pipe 16 is fixedly mounted on the side of the purification tank 14, and a group of sewage separation spray holes distributed in a linear array and arranged horizontally are provided inside the sewage separation pipe 16. The sewage separation spray holes are arranged to deliver oil into the purification tank 14. A sewage discharge branch pipe 17 and a clean oil discharge pipe 18 are fixedly connected to the bottom of the purification tank 14, respectively. The other end of the sewage discharge branch pipe 17 is connected to the sedimentation tank 3, and the other end of the clean oil discharge pipe 18 is connected to the oil storage tank 1. The sewage cleaning component, the filter component and the recoil component are all driven by the servo motor 15.

[0043] Flow meters are installed inside the sewage separation pipe 16 and the clean oil discharge pipe 18. The function of the two flow meters is to monitor the oil intake of the sewage separation pipe 16 per unit time and the oil discharge of the clean oil discharge pipe 18 per unit time respectively. By calculating the flow difference between the sewage separation pipe 16 and the clean oil discharge pipe 18, the blockage degree of the purifier 6 can be assisted in judging. The model of the flow meter is OKD-HZ43WB.

[0044] The cleaning assembly includes an outer rotating cylinder 19, the peripheral side of the outer rotating cylinder 19 is rotatably connected to the purification tank 14, a spiral cleaning piece 20 is fixedly installed at the bottom of the outer rotating cylinder 19, a group of reinforcing rods 21 vertically arranged and fixedly connected to the spiral cleaning piece 20 are fixedly installed at the bottom of the outer rotating cylinder 19, and a first driven bevel gear ring connected to the servo motor 15 is fixedly installed on the top of the outer rotating cylinder 19, and the spiral cleaning piece 20 is made of stainless steel;

[0045] The filter assembly includes a filter vortex 22, which is a hollow cylindrical structure with a closed top and an open bottom. The peripheral side of the filter vortex 22 is rotatably connected to the outer vortex 19. The inner wall of the filter vortex 22 is provided with a plurality of filter meshes 23 distributed in a circumferential array. The filter meshes 23 are arranged horizontally. The function of the filter meshes 23 is to filter oil pollution. In actual production, the mesh diameter of the filter meshes 23 can be customized according to actual filtering requirements.

[0046] The inner wall of the spiral cleaning piece 20 is rotatably fitted with the filter drum 22. A group of rubber brush strips 25 distributed in a linear array are fixedly installed on the inner wall of the spiral cleaning piece 20. The inner walls of the group of rubber brush strips 25 are rotatably fitted with the filter drum 22. The shape of the rubber brush strips 25 is adapted to the spiral shape of the spiral cleaning piece 20. The rubber brush strips 25 are made of wear-resistant rubber material. The arrangement of the rubber brush strips 25 ensures the cleaning effect of the spiral cleaning piece 20 on the surface of the filter drum 22.

[0047] The bottom of the filter vortex 22 is fixedly connected to an oil drain hopper 24 , the bottom end of which is rotatably connected to the clean oil drain pipe 18 , and the top of the filter vortex 22 is fixedly mounted with a second driven bevel gear ring drivingly connected to the servo motor 15 .

[0048] The recoil assembly includes a recoil shaft tube 26 and a connecting tube 27. The recoil shaft tube 26 is a hollow tubular structure with a closed top and an open bottom. The side surface of the connecting tube 27 is fixedly connected to the purification tank 14. The two ends of the connecting tube 27 are fixedly connected to an air intake pipe 28 and an oil wash inlet pipe 29. The air intake pipe 28 and the oil wash inlet pipe 29 are both installed with flow control valves. One end of the air inlet of the air intake pipe 28 is fixedly connected to the air cleaning pump 4, and one end of the oil inlet of the oil wash inlet pipe 29 is fixedly connected to the oil wash tank 5. By setting the flow control valve, the air intake amount per unit time of the air intake pipe 28 and the oil intake amount per unit time of the oil wash inlet pipe 29 are adjusted.

[0049] The circumferential side of the recoil shaft tube 26 is rotatably connected to the filter vortex 22. A third driven bevel gear ring connected to the servo motor 15 is fixedly installed on the top of the recoil shaft tube 26. The inner wall of the recoil shaft tube 26 is provided with a plurality of groups of recoil spray holes 30 distributed in a circumferential array and arranged horizontally. The aperture of the recoil spray hole 30 is 5 times the aperture of the filter mesh 23, and the aperture of the recoil spray hole 30 is 0.1 times the aperture of the sewage separation spray hole.

[0050] A spiral oil pressing sheet 31 is fixedly mounted on the peripheral side surface of the recoil shaft tube 26 , and the peripheral side surface of the spiral oil pressing sheet 31 is rotationally fitted with the filter drum 22 .

[0051] The working principle of the present invention is as follows: This system is mainly applicable to the flushing and purification operation of the oil stringing in the stern tube of the engine room. During daily operation, the inlet oil pipe 7 is used to supply oil into the sedimentation tank 3. After the oil is fed in, sedimentation operation is first carried out in the sedimentation tank 3. When the oil sedimentation is completed, the oil is pumped to the purifier 6 for purification. The purified oil is pumped to the storage oil tank 1 for storage. The oil in the storage oil tank 1 is used to support the normal operation of the tail shaft tube system 2. When it is necessary to carry out the cleaning and maintenance operation of the flushing oil for the relevant pipelines inside this system, first empty the storage oil tank 1 and the sedimentation tank 3. The flushing oil tank 5 and the air cleaning pump 4 first synchronously send high-pressure cleaning oil and high-pressure gas into the backflush shaft tube 26. After the high-pressure cleaning oil and high-pressure gas enter, then through the backflush principle, the filter mesh holes 23 in the filter cylinder 22 are quickly backflushed and self-cleaned. And during the backflush cleaning operation, the filter cylinder 22 performs high-speed centrifugal motion, and then the dirt remaining inside the filter mesh holes 23 is centrifugally thrown out. The oily liquid during dirt cleaning is transported to the sedimentation tank 3 for sedimentation. When the purifier 6 finishes the flushing, the flushing oil tank 5 sends the flushing oil into the storage oil tank 1 and the sedimentation tank 3 in sequence. The oil after flushing enters the sedimentation tank 3 for secondary sedimentation. When the purifier 6 is operating normally, the servo motor 15 outputs the rotational speed in a set state. After the servo motor 15 outputs the rotational speed, it then drives the outer cylinder 19, the backflush shaft tube 26 and the filter cylinder 22 to rotate. After the spiral dirt scraping piece 20 works, it then spirally scrapes the oil dirt intercepted outside the outer cylinder 19. After the filter cylinder 22 rotates, the filter cylinder 22 is evenly worn. After the spiral oil pressing piece 31 works, it then discharges the purified oil from the purified oil discharge pipe 18.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A purifying system for the oil flushing of the engine room stern tube string, which respectively includes an oil storage tank (1) and a tail shaft tube system (2), Characterized in that, It further includes a sedimentation tank (3), an air cleaning pump (4), a flushing oil tank (5) and a purifier (6). The purifier (6) is supplied with oil by the sedimentation tank (3). One end of the purified oil outlet of the purifier (6) is fixedly communicated with the oil storage tank (1). The tail shaft tube system (2) is supplied with oil by the oil storage tank (1). One end of the oil outlet of the flushing oil tank (5) is respectively communicated with the tail shaft tube system (2) and the purifier (6). One end of the sewage outlet of the purifier (6) is communicated with the sedimentation tank (3). One end of the air outlet of the air cleaning pump (4) is communicated with the purifier (6); The purifier (6) includes a tank body assembly. The inner wall of the tank body assembly is rotatably connected with a sewage cleaning assembly. The inner wall of the sewage cleaning assembly is rotatably connected with a filtering assembly. The inner wall of the filtering assembly is rotatably connected with a backwashing assembly communicated with the air cleaning pump (4) and the flushing oil tank (5); The surface of the sedimentation tank (3) is respectively fixedly communicated with an oil inlet pipe (7), a sampling pipe (8) and a sewage main pipe (9). First electromagnetic valves (10) are arranged at the communication parts of the oil inlet pipe (7), the sampling pipe (8) and the sewage main pipe (9) with the sedimentation tank (3). Liquid level probes (11) are installed inside both the sedimentation tank (3) and the oil storage tank (1); Pump bodies (12) are arranged at the communication parts between the purifier (6) and the sedimentation tank (3), between the tail shaft tube system (2) and the oil storage tank (1), between the flushing oil tank (5) and the purifier (6), and between the purifier (6) and the oil storage tank (1). Second electromagnetic valves (13) are arranged at the communication parts between the flushing oil tank (5) and the tail shaft tube system (2) and the purifier (6), and between the oil storage tank (1) and the sedimentation tank (3). The flushing oil tank (5), the oil storage tank (1), the purifier (6) and the sedimentation tank (3) are arranged in sequence from top to bottom inside the system.

2. A purifying system for the oil flushing of the engine room stern tube string according to claim 1, Characterized in that: The tank body assembly includes a purification tank (14). A servo motor (15) is fixedly installed on the peripheral side of the purification tank (14). Three driving bevel gears are installed at the output shaft end of the servo motor (15). A sewage separating pipe (16) is fixedly installed on the side of the purification tank (14). A group of horizontally arranged sewage separating spray holes distributed in a linear array are arranged inside the sewage separating pipe (16). The bottom of the purification tank (14) is respectively fixedly communicated with a sewage discharge branch pipe (17) and a purified oil discharge pipe (18). The other end of the sewage discharge branch pipe (17) is communicated with the sedimentation tank (3). The other end of the purified oil discharge pipe (18) is communicated with the oil storage tank (1). The sewage cleaning assembly, the filtering assembly and the backwashing assembly are all driven by the servo motor (15).

3. A purifying system for the oil flushing of the engine room stern tube string according to claim 2, Characterized in that: Flow meters are installed inside both the sewage separating pipe (16) and the purified oil discharge pipe (18).

4. A purifying system for the oil flushing of the engine room stern tube string according to claim 2, Characterized in that: The cleaning assembly comprises an outer rotating cylinder (19), the peripheral side surface of the outer rotating cylinder (19) being rotatably connected to the purification tank (14), a spiral cleaning sheet (20) being fixedly mounted on the bottom of the outer rotating cylinder (19), a group of reinforcing rods (21) being vertically arranged and fixedly connected to the spiral cleaning sheet (20) being fixedly mounted on the bottom of the outer rotating cylinder (19), and a first driven bevel gear ring being transmission-connected to the servo motor (15) being fixedly mounted on the top of the outer rotating cylinder (19).

5. The engine room stern pipe oil purification system according to claim 4, Features: The filter assembly comprises a filter drum (22), the circumferential side surface of the filter drum (22) being rotatably connected to the outer drum (19), the inner wall of the filter drum (22) being provided with a plurality of groups of filter mesh holes (23) distributed in a circumferential array, the filter mesh holes (23) being arranged horizontally, the inner wall of the spiral cleaning sheet (20) being rotatably fitted to the filter drum (22), the bottom of the filter drum (22) being fixedly connected to an oil drain hopper (24), the bottom end of the oil drain hopper (24) being rotatably connected to a clean oil drain pipe (18), and the top of the filter drum (22) being fixedly mounted with a second driven bevel gear ring which is transmission-connected to a servo motor (15).

6. The engine room stern pipe oil purification system according to claim 5, Features: A group of rubber brush strips (25) distributed in a linear array are fixedly mounted on the inner wall of the spiral cleaning sheet (20); the inner walls of the group of rubber brush strips (25) are rotatably fitted to the filter drum (22); the filter drum (22) is a hollow cylindrical structure with a closed top and an open bottom.

7. The engine room stern pipe oil purification system according to claim 6, Features: The recoil assembly comprises a recoil shaft tube (26) and a connecting tube (27). The side surface of the connecting tube (27) is fixedly connected to the purification tank (14). The two ends of the connecting tube (27) are fixedly connected to an air intake pipe (28) and an oil wash intake pipe (29). The air intake pipe (28) and the oil wash intake pipe (29) are both installed with flow control valves. One end of the air intake of the air intake pipe (28) is fixedly connected to the air cleaning pump (4). One end of the oil intake of the oil wash intake pipe (29) is fixedly connected to the oil wash tank (5). The recoil shaft tube (26) has a circumferential side surface that is rotatably connected to the filter drum (22); a third driven bevel gear ring that is transmission-connected to the servo motor (15) is fixedly mounted on the top of the recoil shaft tube (26); a plurality of groups of recoil spray holes (30) that are distributed in a circumferential array and arranged horizontally are formed on the inner wall of the recoil shaft tube (26); a spiral oil pressure sheet (31) is fixedly mounted on the circumferential side surface of the recoil shaft tube (26); and the circumferential side surface of the spiral oil pressure sheet (31) is rotatably fitted to the filter drum (22).

8. The engine room stern pipe oil purification system according to claim 7, Features: The recoil shaft tube (26) is a hollow tubular structure with a closed top and an open bottom. The aperture diameter of the recoil spray hole (30) is 3 to 10 times that of the filter mesh hole (23), and the aperture diameter of the recoil spray hole (30) is 0.1 to 0.3 times that of the sewage separation spray hole.

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