Marine oil filter system with automatic cleaning function

Abstract

A marine oil filter system with an automatic cleaning function belongs to the technical field of marine lubricating oil, aims to solve the problem that an existing oil filter needs to be manually cleaned after being detached, and comprises a coarse filter bottle, a fine filter bottle, a pressure tank, a waste oil tank, an electromagnetic valve module and a controller. To-be-filtered oil sequentially passes through the coarse filter bottle and the fine filter bottle for secondary filtration, one part of the filtered oil is discharged out of the oil filter system for ship use, and the other part of the filtered oil is discharged into the pressure tank; differential pressure sensors are arranged at the bottoms of the coarse filtering bottle and the fine filtering bottle, when the differential pressure sensors reach a set threshold value, the coarse filtering bottle and the fine filtering bottle are filled with filtered oil in the pressure tank, the coarse filtering bottle and the fine filtering bottle are washed, and waste oil obtained after washing is discharged into a waste oil tank; the electromagnetic valve module comprises a plurality of electromagnetic valves which are installed on the oil inlet passages and the oil outlet passages, and the controller controls opening or closing of the electromagnetic valves to achieve switching between oil supply and cleaning. The invention is used for a ship power system.

Description

Technical Field

[0001] The invention relates to an automatic cleaning ship oil filter system, belonging to the technical field of ship lubricating oil. Background Art

[0002] In the ship power system, the oil filter plays a vital role in the reliability and stability of the ship power system. The oil filter can filter impurities contained in fuel and lubricating oil, ensure the normal operation of the main engine and gearbox, and extend the service life of the power system, and improve the reliability and stability of the ship during navigation.

[0003] Common oil filters are composed of a double coarse filter bottle, a fine filter bottle, a differential pressure switch, etc. The oil to be filtered first passes through the double coarse filter bottle, which serves as a backup for each other. During normal operation, only one oil line is connected, which can be switched manually. The oil that has passed through the double coarse filter bottle enters the fine filter bottle for further filtration. Only after the secondary filtration can the oil be supplied to the ship's power system.

[0004] After the oil filter has been working for a certain period of time, impurities (such as rust, sand, colloid, etc.) will be deposited in the oil filter, affecting the working efficiency of the oil filter. In the past, the method to solve this problem was to manually judge the blockage status of the oil filter based on the reading of the differential pressure sensor, then switch to the other side of the double coarse filter bottle, and then manually clean the oil filter.

[0005] This traditional cleaning method has the following problems:

[0006] 1. Manual cleaning requires disassembly of the oil filter bottle and the training of professionals to operate it. There may be problems such as insufficient cleaning and damage to the filter, and each cleaning is time-consuming and laborious;

[0007] 2. Manual cleaning is often not done in time, which affects the filtering effect of the oil filter and reduces the working efficiency of the ship's power system;

[0008] 3. During the voyage of the ship, there is a risk of oil leakage when cleaning the oil filter bottle.

[0009] In summary, the traditional manual cleaning method has many shortcomings, and an oil filter automatic cleaning device is needed to automatically, efficiently and conveniently clean the oil filter to improve the reliability and economy of the ship power system. Summary of the invention

[0010] The purpose of the invention is to solve the problem that the existing oil filter needs to be disassembled and then manually cleaned, and to provide an automatically cleaning marine oil filter system.

[0011] The automatic cleaning marine oil filter system of the present invention comprises a coarse filter bottle, a fine filter bottle, a pressure tank, a waste oil tank, a solenoid valve module and a controller;

[0012] The oil to be filtered is filtered through the coarse filter bottle and the fine filter bottle in turn for secondary filtration. Part of the filtered oil is discharged from the oil filter system for use by the ship, and the other part is discharged into the pressure tank;

[0013] The bottom of the coarse filter bottle and the fine filter bottle are both provided with a pressure difference sensor. When the pressure difference sensor reaches the set threshold, the filtered oil in the pressure tank is filled into the coarse filter bottle and the fine filter bottle to flush the coarse filter bottle and the fine filter bottle. The waste oil after flushing is discharged into the waste oil tank;

[0014] The solenoid valve module includes multiple solenoid valves installed on each oil inlet and outlet passage. The controller controls the opening or closing of the solenoid valves to achieve oil supply and cleaning switching.

[0015] Preferably, it further comprises a pressure sensor, wherein the pressure sensor is arranged at the bottom of the pressure tank, and when the pressure sensor reaches a set threshold value, the controller stops discharging filtered oil into the pressure tank.

[0016] Preferably, the solenoid valve module includes a coarse filter oil outlet solenoid valve, a fine filter oil outlet solenoid valve, a coarse filter cleaning solenoid valve, a coarse filter waste oil solenoid valve, a fine filter cleaning solenoid valve, a fine filter waste oil solenoid valve and a pressure tank solenoid valve;

[0017] The coarse filter oil outlet solenoid valve is arranged on the pipeline between the coarse filter bottle and the fine filter bottle, the fine filter oil outlet solenoid valve is arranged on the pipeline between the fine filter bottle and the oil filter system, the coarse filter cleaning solenoid valve is arranged on the pipeline between the pressure tank and the coarse filter bottle, the coarse filter waste oil solenoid valve is arranged on the pipeline between the coarse filter bottle and the waste oil tank, the fine filter cleaning solenoid valve is arranged on the pipeline between the pressure tank and the fine filter bottle, the fine filter waste oil solenoid valve is arranged on the pipeline between the fine filter bottle and the waste oil tank, and the pressure tank solenoid valve is arranged on the pipeline between the fine filter bottle and the pressure tank.

[0018] Preferably, when filtering the oil to be filtered, the controller controls the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to open, and the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to close;

[0019] When flushing the coarse filter bottle and the fine filter bottle, the controller controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close;

[0020] When the pressure sensor reaches the set threshold, the controller controls the pressure tank solenoid valve to close.

[0021] Preferably, the controller is also provided with a timing module. When the timing module reaches the set time, the controller controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle and the fine filter bottle.

[0022] Preferably, the controller monitors the working status of the oil filter system. When the oil filter system is in a stopped operating condition, the controller controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle and the fine filter bottle.

[0023] Preferably, the controller monitors the differential pressure sensor, and when the real-time differential pressure signal of the differential pressure sensor does not decrease below a set minimum threshold value after flushing the coarse filter bottle and the fine filter bottle, the controller sends a signal to replace the filter.

[0024] Preferably, the set threshold value of the differential pressure sensor is 0.05-0.1Mpa.

[0025] Preferably, the set threshold value of the pressure sensor is 0.6 MPa.

[0026] Preferably, the coarse filter bottle and the fine filter bottle have the same structure, a filter screen is arranged in the inner cavity of the bottle body, the filtered oil inlet passage and the cleaning oil inlet passage are arranged above the bottle body, and the filtered oil outlet passage and the waste oil outlet passage are arranged below the bottle body.

[0027] The automatic cleaning marine oil filter system of the present invention has the following advantages:

[0028] 1. There is no need to disassemble the filter bottle during cleaning, making the cleaning work more convenient. Relevant personnel only need to clean the waste oil tank, which effectively reduces labor costs and time costs, and also improves the safety of the equipment during use.

[0029] 2. It can maintain high-efficiency filtering performance for a long time, reduce the downtime of the ship power system caused by oil filter system failure, and improve operating efficiency;

[0030] 3. It can effectively increase the cleaning frequency and extend the service life of the filter element. Moreover, the control method of a single filter bottle plus a solenoid valve used in this article is cheaper than the traditional double coarse filter bottle. From a long-term perspective, it reduces the operating and maintenance costs, and also reduces the economic losses caused by downtime due to maintenance of the oil filter system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a principle block diagram of the automatic cleaning marine oil filter system of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the coarse filter bottle and the fine filter bottle of the present invention;

[0033] Figure 3 It is a control principle block diagram of the controller described in the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0037] Embodiment 1:

[0038] Combine the following Figure 1 and Figure 2 The present embodiment is described as an automatic cleaning marine oil filter system, which comprises a coarse filter bottle 1, a fine filter bottle 2, a pressure tank 3, a waste oil tank 4, a solenoid valve module and a controller 5;

[0039] The oil to be filtered is sequentially filtered through the coarse filter bottle 1 and the fine filter bottle 2 for secondary filtration. A portion of the filtered oil is discharged from the oil filter system for use by the ship, and the other portion is discharged into the pressure tank 3;

[0040] A pressure differential sensor is provided at the bottom of the coarse filter bottle 1 and the fine filter bottle 2. When the pressure differential sensor reaches a set threshold, the filtered oil in the pressure tank 3 is filled into the coarse filter bottle 1 and the fine filter bottle 2 to flush the coarse filter bottle 1 and the fine filter bottle 2. The waste oil after flushing is discharged into the waste oil tank 4.

[0041] The solenoid valve module includes a plurality of solenoid valves installed on each oil inlet passage and oil outlet passage. The controller 5 controls the opening or closing of the solenoid valves to realize the switching between oil supply and cleaning.

[0042] Furthermore, the pressure sensor is arranged at the bottom of the pressure tank 3 , and when the pressure sensor reaches a set threshold, the controller 5 stops discharging filtered oil into the pressure tank 3 .

[0043] Furthermore, the solenoid valve module includes a coarse filter oil outlet solenoid valve, a fine filter oil outlet solenoid valve, a coarse filter cleaning solenoid valve, a coarse filter waste oil solenoid valve, a fine filter cleaning solenoid valve, a fine filter waste oil solenoid valve and a pressure tank solenoid valve;

[0044] The coarse filter oil outlet solenoid valve is arranged on the pipeline between the coarse filter bottle 1 and the fine filter bottle 2, the fine filter oil outlet solenoid valve is arranged on the pipeline between the fine filter bottle 2 and the oil filter system, the coarse filter cleaning solenoid valve is arranged on the pipeline between the pressure tank 3 and the coarse filter bottle 1, the coarse filter waste oil solenoid valve is arranged on the pipeline between the coarse filter bottle 1 and the waste oil tank 4, the fine filter cleaning solenoid valve is arranged on the pipeline between the pressure tank 3 and the fine filter bottle 2, the fine filter waste oil solenoid valve is arranged on the pipeline between the fine filter bottle 2 and the waste oil tank 4, and the pressure tank solenoid valve is arranged on the pipeline between the fine filter bottle 2 and the pressure tank 3.

[0045] Furthermore, when filtering the oil to be filtered, the controller 5 controls the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to be opened, and the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to be closed;

[0046] When flushing the coarse filter bottle 1 and the fine filter bottle 2, the controller 5 controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close;

[0047] When the pressure sensor reaches the set threshold, the controller 5 controls the pressure tank solenoid valve to close.

[0048] Furthermore, the controller 5 is also provided with a timing module. When the timing module reaches the set time, the controller 5 controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle 1 and the fine filter bottle 2.

[0049] Furthermore, the controller 5 monitors the working status of the oil filter system. When the oil filter system is in a stopped operating condition, the controller 5 controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle 1 and the fine filter bottle 2.

[0050] Furthermore, the controller 5 monitors the differential pressure sensor, and when the real-time differential pressure signal of the differential pressure sensor does not decrease below the set minimum threshold value after flushing the coarse filter bottle 1 and the fine filter bottle 2, the controller 5 sends a signal to replace the filter.

[0051] Furthermore, the set threshold value of the differential pressure sensor is 0.05-0.1Mpa.

[0052] Furthermore, the set threshold value of the pressure sensor is 0.6Mpa.

[0053] Furthermore, the coarse filter bottle 1 and the fine filter bottle 2 have the same structure, a filter screen is arranged in the inner cavity of the bottle body, the filtered oil inlet passage and the cleaning oil inlet passage are arranged above the bottle body, and the filtered oil outlet passage and the waste oil outlet passage are arranged below the bottle body.

[0054] In the present invention, Figure 1 As shown, an automatic cleaning marine oil filter system proposed by the present invention is composed of a coarse filter bottle, a fine filter bottle, a waste oil tank, a pressure tank, a pressure sensor, a coarse filter bottle pressure difference sensor, a fine filter bottle pressure difference sensor, a coarse filter oil outlet solenoid valve, a fine filter oil outlet solenoid valve, a pressure tank solenoid valve, a coarse filter cleaning solenoid valve, a coarse filter waste oil solenoid valve, a fine filter flushing solenoid valve, a fine filter waste oil solenoid valve and a controller.

[0055] The automatic cleaning marine oil filter system proposed by the present invention includes three working conditions, namely normal working condition, oil replenishing working condition and cleaning working condition;

[0056] The working principle under normal working conditions is: the pressure tank solenoid valve, coarse filter cleaning solenoid valve, coarse filter waste oil solenoid valve, fine filter flushing solenoid valve, and fine filter waste oil solenoid valve are in the normally closed state. When the oil to be filtered enters the oil filter system, it first passes through the coarse filter bottle and then the fine filter bottle. After secondary filtration, it is normally supplied to the ship's power system.

[0057] The working principle under the oil replenishment condition is: when the oil circuit is supplying oil normally, if the oil pressure in the pressure tank is low, the controller controls the pressure tank solenoid valve to open, and the filtered oil is supplied to the ship's power system and the pressure tank at the same time. When the pressure in the pressure tank reaches the rated pressure, the controller closes the pressure tank solenoid valve.

[0058] The working principle under the cleaning condition is: when the pressure difference of the coarse filter bottle or the fine filter bottle reaches a certain value, or the operator controls to enter this condition, the controller is responsible for opening the corresponding cleaning solenoid valve and waste oil solenoid valve, and closing the corresponding oil outlet solenoid valve to achieve the purpose of cleaning the corresponding filter bottle.

[0059] The controller used is implemented by a single-chip microcomputer and includes the following functions:

[0060] Cleaning control function: automatic filter start and stop control, automatically switching between normal working condition and cleaning working condition according to the indications of the two differential pressure transmitters, and switching to oil replenishment condition when the oil pressure in the pressure tank is too low; regular cleaning control, the controller can perform timed cleaning according to the clock, when the rated time is reached, or after each host shutdown, the host or gearbox and other equipment are not in operation (the differential pressure transmitter indicates 0MPa), the cleaning condition is turned on; manual start, the controller is set with a corresponding button, and the relevant personnel can manually start the filter cleaning program when it is needed.

[0061] Alarm function: filter element replacement alarm. When the differential pressure transmitter cannot be reduced to the set value by cleaning, the controller will sound an alarm to remind relevant personnel to replace the filter element.

[0062] Communication and data recording function: The controller can communicate with the host computer or monitoring system to send the system's operating status and alarm information to facilitate the normal operation status management of the ship; at the same time, the controller can also record operating data, such as single cleaning time, automatic cleaning cycle, pressure difference transmitter indication changes and other information, to facilitate the later maintenance and upgrade of the system.

[0063] The connection method of the coarse filter / fine filter bottle oil circuit is as follows Figure 2 As shown, the filter bottle is installed up and down, and the oil inlet passage is located above the filter bottle. The purpose is to reduce the risk of impurities blocking the oil inlet. The clean oil passage is located above the filter bottle. The purpose is to allow the clean oil to clean the filter bottle from top to bottom to maximize the cleaning effect. At the same time, in order to prevent impurities from remaining on the top of the filter screen, the top of the filter screen is designed to be an arc shape. The pressure tank can be selected from the commonly used pressure tanks on the market, and its volume can be selected between 0.6-1 times the volume of the filter bottle. The two sensor interfaces of the differential pressure transmitter are located on both sides of the filter screen.

[0064] All solenoid valves can be 12V DC driven solenoid valves, or two cleaning solenoid valves and two waste oil solenoid valves can be combined into a three-position three-way solenoid valve for control. In view of the fact that the present invention should be integrated on the ship's main engine or gearbox under normal conditions, all 12V normally closed solenoid valves are used to facilitate the wiring of the oil circuit and the control circuit.

[0065] The controller uses STM32F103 microcontroller, such as Figure 3 As shown, the hardware connections of each part are as follows:

[0066] Power supply module: The power supply first uses an AC220V to DC30V transformer to obtain a 30V voltage, and then connects a filter capacitor (1000μF) at the output end to ensure the stability of the voltage. After that, the DC-DC chip LM2577HV is connected, and the feedback resistor is adjusted to obtain a DC24V voltage. This part of the voltage is used to drive the solenoid valve, pressure transmitter, etc. Finally, the AMS1117-3.3 linear voltage regulator chip and the filter capacitor are connected to obtain a 3.3V voltage to supply the microcontroller.

[0067] Pressure sensor: The output signal is 4-20mA signal, which is connected in series with a 250Ω resistor and then connected to the PA0, PA1 and PA2 pins of ADC1 of the 32-bit microcontroller.

[0068] Solenoid valve control module: Since the voltage required to drive the solenoid valve is greater than the output voltage of the 32-bit single-chip microcomputer, the solenoid valve cannot be driven directly by the single-chip microcomputer. Therefore, the ULN2803 chip is combined with an intermediate relay for control. Connect the 0-7 pins of the GPIOA of the 32-bit single-chip microcomputer to the IN1-IN7 pins of the ULN2803, then connect the relay in series to the ULN2803 pins, and connect a diode in parallel at both ends of the relay coil to prevent the reverse electromotive force of the relay from acting on the ULN2803 chip.

[0069] Buttons and buzzer: The buttons use independent buttons and can be directly connected to the subsequent pins of GPIOA for control. The buttons are used to manually execute the cleaning program; the buzzer is controlled by an NPN transistor and is also connected to the GPIO pin.

[0070] 485 communication module: Use the MAX485 chip to realize the 485 communication function, connect the DI pin of the MAX485 to the TX pin of the 32 MCU, connect the DE pin to VCC, leave the RO pin floating, connect the RE pin to GND, and connect the A and B pins to the A and B pins of the RS485 bus respectively, so as to realize the 485 communication function.

[0071] SD card writing module: connect the MOSI, MISO, SCK, CS, pins of 32 single-chip microcomputer SPI2 to the DI, DO, CLK, CS pins of the SD card respectively, and write the operation data of working condition 2 and working condition 3 into the DATA.txt file of the SD card. Each operation data includes the following contents:

[0072] The initial operation data includes the following:

[0073] Current time Starting mode Operating condition 2 / 3 Initial pressure of pressure tank Number of filter tank to be cleaned Current indication of differential pressure transmitter;

[0074] At the end of the operation, the data includes the following:

[0075] Current time pressure tank current pressure after cleaning differential pressure transmitter indication.

[0076] Display module: The display screen can use a 0.96-inch OLED screen for display. Connect the VCC, GND, SCL, and SDA of the screen to the power supply, GND, SCK, and MOSI interfaces of the 32-bit microcontroller.

[0077] The display screen shows:

[0078] Current time;

[0079] When in working condition 2 or 3, the display will show: Automatic oil filling / Automatic cleaning;

[0080] When a system failure occurs, the display shows: System failure.

[0081] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. An automatic cleaning marine oil filter system, characterized in that: It comprises a coarse filter bottle (1), a fine filter bottle (2), a pressure tank (3), a waste oil tank (4), a solenoid valve module and a controller (5); The oil to be filtered is sequentially filtered through a coarse filter bottle (1) and a fine filter bottle (2) for secondary filtration, a portion of the filtered oil is discharged from the oil filter system for use by the ship, and the other portion is discharged into a pressure tank (3); A pressure differential sensor is provided at the bottom of the coarse filter bottle (1) and the fine filter bottle (2). When the pressure differential sensor reaches a set threshold, filtered oil in the pressure tank (3) is filled into the coarse filter bottle (1) and the fine filter bottle (2), and the coarse filter bottle (1) and the fine filter bottle (2) are flushed. The waste oil after flushing is discharged into the waste oil tank (4); The solenoid valve module comprises a plurality of solenoid valves which are installed on each oil inlet passage and each oil outlet passage. The controller (5) controls the opening or closing of the solenoid valves to realize the switching between oil supply and cleaning.

2. The automatic cleaning marine oil filter system according to claim 1, characterized in that: It also includes a pressure sensor, which is arranged at the bottom of the pressure tank (3). When the pressure sensor reaches a set threshold, the controller (5) stops the filtered oil from being discharged into the pressure tank (3).

3. The automatic cleaning marine oil filter system according to claim 2, characterized in that: The solenoid valve module includes a coarse filter oil outlet solenoid valve, a fine filter oil outlet solenoid valve, a coarse filter cleaning solenoid valve, a coarse filter waste oil solenoid valve, a fine filter cleaning solenoid valve, a fine filter waste oil solenoid valve and a pressure tank solenoid valve; The coarse filter oil outlet solenoid valve is arranged on the pipeline between the coarse filter bottle (1) and the fine filter bottle (2), the fine filter oil outlet solenoid valve is arranged on the pipeline between the fine filter bottle (2) and the oil filter system, the coarse filter cleaning solenoid valve is arranged on the pipeline between the pressure tank (3) and the coarse filter bottle (1), the coarse filter waste oil solenoid valve is arranged on the pipeline between the coarse filter bottle (1) and the waste oil tank (4), the fine filter cleaning solenoid valve is arranged on the pipeline between the pressure tank (3) and the fine filter bottle (2), the fine filter waste oil solenoid valve is arranged on the pipeline between the fine filter bottle (2) and the waste oil tank (4), and the pressure tank solenoid valve is arranged on the pipeline between the fine filter bottle (2) and the pressure tank (3).

4. The automatic cleaning marine oil filter system according to claim 3, characterized in that: When filtering the oil to be filtered, the controller (5) controls the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to open, and the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to close; When flushing the coarse filter bottle (1) and the fine filter bottle (2), the controller (5) controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close; When the pressure sensor reaches a set threshold, the controller (5) controls the pressure tank solenoid valve to close.

5. The automatic cleaning marine oil filter system according to claim 4, characterized in that: The controller (5) is also provided with a timing module. When the timing module reaches a set time, the controller (5) controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle (1) and the fine filter bottle (2).

6. The automatic cleaning marine oil filter system according to claim 5, characterized in that: The controller (5) monitors the working state of the oil filter system. When the oil filter system is in a stopped operating state, the controller (5) controls the coarse filter cleaning solenoid valve, the coarse filter waste oil solenoid valve, the fine filter cleaning solenoid valve and the fine filter waste oil solenoid valve to open, and the coarse filter oil outlet solenoid valve and the fine filter oil outlet solenoid valve to close, so as to flush the coarse filter bottle (1) and the fine filter bottle (2).

7. The automatic cleaning marine oil filter system according to claim 6, characterized in that: The controller (5) monitors the differential pressure sensor, and when the real-time differential pressure signal of the differential pressure sensor does not decrease below a set minimum threshold value after the coarse filter bottle (1) and the fine filter bottle (2) are flushed, the controller (5) sends a filter replacement signal.

8. An automatic cleaning marine oil filter system according to any one of claims 1 to 7, characterized in that: The set threshold of the differential pressure sensor is 0.05-0.1Mpa.

9. An automatic cleaning marine oil filter system according to any one of claims 2 to 7, characterized in that: The set threshold of the pressure sensor is 0.6Mpa.

10. The automatic cleaning marine oil filter system according to claim 1, characterized in that: The coarse filter bottle (1) and the fine filter bottle (2) have the same structure, a filter screen is arranged in the inner cavity of the bottle body, a filter oil inlet passage and a cleaning oil inlet passage are arranged above the bottle body, and a filter oil outlet passage and a waste oil outlet passage are arranged below the bottle body.

Images