Intelligent drainage long-acting filter and control method

Abstract

The present application relates to the technical field of fuel filter, and discloses a wisdom drainage long-acting filter and a control method, which comprises a shell and an internal filter element assembly, the bottom of the shell is provided with a first water accumulation chamber and a second water accumulation chamber which are independent of each other, the filter element assembly comprises a filter element, a hydrophobic filter screen and a filter element framework for separating an outer separation cavity and an inner separation cavity, a two-way electromagnetic valve assembly synchronously controls the closing of a liquid inlet channel and the opening of a liquid outlet channel through a coaxial valve core, cooperates with a separation plate to form an independent drainage chamber, realizes uninterrupted drainage under the running state of an engine, and a water level sensor monitors the water level of the first water accumulation chamber in real time and triggers the action of the electromagnetic valve, the present application synchronously controls the sealing isolation of the separation plate and the electromagnetic valve assembly, completely blocks the risk of air backflow, and solves the problems of engine shutdown for drainage and air infiltration causing air resistance in the prior art.

Description

Technical Field

[0001] This invention relates to the field of fuel filter technology, specifically to a smart drainage long-lasting filter and its control method. Background Technology

[0002] A fuel filter is a device used to filter impurities and moisture from fuel, designed to protect the delicate components of the engine's fuel system from wear and damage. It is an important part of the engine's fuel system, effectively extending the engine's lifespan and maintaining its normal operation.

[0003] After fuel passes through the fuel filter, the separated water accumulates in the water collection cup at the bottom of the filter. Over time, if the water in the collection cup reaches a set limit and is not drained promptly, it will enter the filter element, crowding out the fuel and damaging the paper filter element's strength, thus reducing its lifespan. This affects the filter's ability to filter fuel and its ability to separate oil and water. In severe cases, it can affect the filter's fuel flow rate, causing insufficient fuel supply to the engine, which can damage the engine injectors, high-pressure pump components, and even cause the engine to stall.

[0004] To solve the above problems, the water in the collection cup needs to be drained in a timely manner. Currently, the most common method is to install a drain valve at the bottom of the filter's collection cup, which is manually opened periodically to drain the water. Another method is to use a sensor to measure the water level in the collection cup. When the water level reaches or exceeds the drain level set by the vehicle's ECU, the driver receives an alarm from the ECU to drain the water. For example, CN105228719A discloses an automatic drainage device including a storage tank, a fluid inlet, and a fluid outlet. A first valve component can move between an open position allowing fluid to enter the storage tank through the fluid inlet and a closed position preventing fluid from entering the storage tank. A second valve component can move between an open position for discharging fluid from the storage tank and a closed position for preventing fluid from discharging from the storage tank. This automatic drainage device is installed in communication with a container in which water is separated from fuel by being collected at the bottom of the container. The automatic drainage device uses a sensor to open the first valve, allowing water to flow from the container into the storage tank within the automatic drainage device. When the first valve is closed, the second valve opens, and the second valve allows water in the storage tank to leave the automatic drainage device while blocking the fluid communication between the storage tank and the container.

[0005] The technical challenges of achieving non-stop drainage are twofold: First, when the engine is running, the filter is in a negative pressure state, so even if automatic drainage is activated, the water cannot be discharged smoothly. Second, when draining while the engine is running, if the valve control is not timely or synchronized, air will enter the filter chamber in reverse. The air will form bubbles in the fuel line, which will hinder the flow of fuel, resulting in insufficient fuel supply, reduced engine power, or engine stalling.

[0006] In both of these methods, once the filter water level reaches the threshold, when the driver is informed that the water level is too high, the vehicle still needs to be parked in a suitable location and the engine stopped before the mechanical drain valve or the solenoid valve can be operated. The technical logic remains the same: stop the engine first, then drain the water.

[0007] Existing technologies are limited by structural complexity, low negative pressure drainage efficiency, and the risk of air backflow, and cannot meet the reliable drainage requirements of fuel filters when the engine is running. Summary of the Invention

[0008] This invention addresses the technical problems existing in the prior art by providing a smart drainage long-lasting filter and control method. Through the filter structure and solenoid valve assembly, an independent drainage chamber is formed, which can achieve uninterrupted drainage while the engine is running.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a smart drainage long-lasting filter, comprising a shell, a filter base, and a filter element assembly disposed inside the shell, wherein the filter base is detachably installed on the top of the shell. The bottom of the shell is provided with relatively independent first and second water collection chambers. The filter element assembly includes a filter element frame, a filter element, and a hydrophobic filter screen. The filter element and the hydrophobic filter screen are both mounted on the filter element frame. The filter element is sleeved outside the hydrophobic filter screen, forming an outer separation cavity between the filter element and the shell, and an inner separation cavity between the hydrophobic filter screen and the filter element. The inner separation cavity communicates with the second water collection chamber. The outer separation cavity and the first water collection chamber are sealed and isolated by an isolation plate. A liquid inlet channel is provided between the outer separation cavity and the first water collection chamber. The first water collection chamber is also provided with a liquid outlet channel. A solenoid valve assembly is provided at the bottom of the shell. When energized, the solenoid valve assembly controls the liquid inlet channel to close while simultaneously opening the liquid outlet channel.

[0010] The solenoid valve assembly controls the selective opening and closing of the liquid inlet channel and the liquid outlet channel. Specifically, the solenoid valve assembly includes a first control state and a second control state. The first control state is an energized state, and the second control state is a de-energized state. In the de-energized state, the solenoid valve assembly controls the liquid outlet channel to close while the liquid inlet channel opens. A one-way valve assembly is provided between the first and second water accumulation chambers. The one-way valve assembly controls the one-way flow from the second water accumulation chamber to the first water accumulation chamber. A water level sensor assembly is provided in the first water accumulation chamber. The water level sensor assembly is used to monitor the water level in the first water accumulation chamber and controls the opening and closing of the solenoid valve assembly through the controller.

[0011] With the above technical solution, when the engine is running, the wastewater filtered out by the filter element enters the first water chamber through the liquid inlet channel from the outer separation chamber. The emulsified water separated by the hydrophobic filter enters the second water chamber from the inner separation chamber. When the wastewater in the first water chamber reaches a certain level, the water level sensor component detects that the wastewater in the first water chamber has reached the upper threshold. The water level sensor component outputs a voltage signal, which triggers the solenoid valve component to be energized through the controller. After the solenoid valve component is energized, it controls the liquid inlet channel to close and the liquid outlet channel to open, so that the wastewater in the first water chamber is discharged to the outside. At this time, the engine is still running. Because the first water chamber is isolated and sealed from the outer separation chamber, and the one-way valve component is in the closed state, the first water chamber forms an independent discharge space. When the engine is running, no air will enter the outer and inner separation chambers of the filter, which can effectively prevent air backflow, thus realizing a non-stop drainage mode. As wastewater is discharged, the water level sensor assembly detects that the wastewater level in the first water collection chamber has reached the lower threshold. The water level sensor assembly then outputs no voltage signal, the solenoid valve assembly is de-energized and reset, closing the liquid outlet channel while simultaneously opening the liquid inlet channel. The previously blocked wastewater then re-enters the first water collection chamber from the outer separation chamber. When the water level in the first water collection chamber is lower than that in the second water collection chamber, or when the specific gravity of the water in the second water collection chamber is greater than that in the first water collection chamber, the one-way valve assembly opens, allowing water from the second water collection chamber to enter the first water collection chamber. Conversely, the one-way valve assembly closes.

[0012] A further aspect of the present invention is that the solenoid valve assembly is a two-position four-way solenoid valve.

[0013] Preferably, the two-position four-way solenoid valve includes a valve body and a valve core. A valve cavity is formed within the valve body, extending through the valve body and forming a first input channel and a second output channel. The valve core is disposed within the valve cavity and is a coaxial valve core. A first output channel communicating with the first input channel and a second input channel communicating with the second output channel are respectively formed at the upper and lower ends of one side of the valve body. The first input channel and the first output channel communicate to form an L-shaped liquid inlet channel, and the second input channel and the second output channel communicate to form an L-shaped liquid outlet channel. The first input channel communicates with an external separation chamber, the first output channel communicates with a first water accumulation chamber, the second input channel communicates with the first water accumulation chamber, and the second output channel communicates with the outside. The valve core is driven by an electromagnetic coil within the valve body. When energized, it simultaneously closes the first input channel and the second output channel; when de-energized, it resets and opens the first input channel and closes the second output channel.

[0014] A further aspect of the present invention is that the upper and lower ends of the valve core are respectively provided with conical sealing surfaces, and the first input channel and the second output channel are provided with matching horn-shaped openings.

[0015] A further aspect of the present invention is that the first input channel at the upper end of the valve body is sealed to the isolation plate by a sealing ring, and the first output channel and the second input channel of the valve body are sealed to the bottom of the outer shell by a sealing ring.

[0016] To facilitate the rapid discharge of sewage from the first water collection chamber and balance the pressure within it, the first water collection chamber is also connected to an air intake channel. The opening and closing of the air intake channel is controlled by a solenoid valve assembly. Preferably, the valve body of the two-position four-way solenoid valve is provided with an air intake channel connected to the first output channel. When the two-position four-way solenoid valve is de-energized, the air intake channel is closed; when the two-position four-way solenoid valve is energized, the air intake channel is open.

[0017] A further aspect of the present invention is that the isolation plate is detachably connected to the outer shell, and a sealing ring is provided at the connection between the isolation plate and the outer shell.

[0018] Preferably, the water level sensor assembly is one of photoelectric, float, capacitive, probe, cable, and ultrasonic water level sensors.

[0019] A further aspect of the present invention is that the filter element frame includes a central tube, an upper end cap, and a lower end cap, the upper end cap and the lower end cap being fixedly installed at the upper and lower ends of the central tube, respectively, the central tube having evenly distributed through holes that allow fuel to pass through, the filter element being sleeved on the outside of the central tube, and the hydrophobic filter screen being sleeved on the inside of the central tube.

[0020] Preferably, the one-way valve assembly is a pressure-gravity one-way valve. The water collected in the second water collection chamber has a higher purity and specific gravity than that in the first water collection chamber. Because the second water collection chamber has negative pressure, sewage from the first water collection chamber cannot enter the second water collection chamber under any dynamic conditions. The pressure-gravity one-way valve will only open when the water level in the second water collection chamber is higher than that in the first water collection chamber or when the specific gravity of the water collected in the second water collection chamber is greater than that in the first water collection chamber.

[0021] A control method for a smart, long-lasting drainage filter includes the following steps:

[0022] S1. The water level in the first water accumulation chamber is monitored in real time by the water level sensor component. When the water level reaches the preset upper limit threshold, the water level sensor component generates a first control command.

[0023] S2. In response to the first control command, the controller triggers the solenoid valve assembly to synchronously execute the following actions:

[0024] Close the liquid inlet channel and block the connection between the external separation chamber and the first water accumulation chamber;

[0025] Open the liquid outlet channel to discharge the sewage in the first water collection chamber to the outside;

[0026] S3. When the water level in the first water chamber drops to a preset lower threshold, the water level sensor generates a second control command.

[0027] S4. In response to the second control command, the controller triggers the solenoid valve assembly to synchronously perform the following actions:

[0028] Close the liquid outlet channel and stop drainage;

[0029] The liquid inlet channel is opened, and the sewage in the external separation chamber re-enters the first water accumulation chamber.

[0030] The drainage methods S1 to S4 described above can be implemented whether the engine is stopped or running.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] This invention utilizes the synchronized closing and opening of a bidirectional solenoid valve assembly, combined with the sealing and isolation of the first water chamber by an isolation plate, to enable drainage operations while the engine is continuously running. This completely eliminates the limitation of traditional technologies that require engine shutdown, allowing for drainage anytime, anywhere without stopping the engine. The coaxial linkage design of the bidirectional solenoid valve ensures the synchronization of the liquid inlet channel closing and the liquid outlet channel opening. Combined with the independent drainage space created by the isolation plate, this completely blocks the connection between external air and the filter's internal cavity throughout the drainage process. The one-way valve assembly automatically opens and closes based on the water level difference or specific gravity difference between the first and second water chambers. Intelligent drainage is achieved through the automatic control of the solenoid valve assembly by a water level sensor assembly and a controller. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the filter structure in Embodiment 1 of the present invention;

[0035] Figure 2 This is a schematic diagram of the solenoid valve in Embodiment 1 of the present invention;

[0036] Figure 3 This is a schematic diagram of the solenoid valve in Embodiment 2 of the present invention;

[0037] Figure 4 This is a schematic diagram of the solenoid valve in the de-energized state in Embodiment 1 of the present invention;

[0038] Figure 5This is a schematic diagram of the energized state of the solenoid valve in Embodiment 1 of the present invention.

[0039] In the diagram, 1. Filter base; 2. Inner separation chamber; 3. Upper end cover; 4. Outer shell; 5. Outer separation chamber; 6. Hydrophobic filter screen; 7. Central tube; 8. Filter element; 9. Lower end cover; 10. Guide tube; 11. Solenoid valve assembly; 12. Check valve assembly; 13. Water level sensor assembly; 14. First water collection chamber; 15. Isolation plate; 16. Second water collection chamber; 17. Liquid inlet channel; 18. Liquid outlet channel; 19. Valve body; 20. Valve core; 21. First input channel; 22. First output channel; 23. Second input channel; 24. Second output channel; 25. Air inlet channel. Detailed Implementation

[0040] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0041] Figures 1-2 Embodiment 1 of the present invention is shown.

[0042] like Figure 1 As shown, this embodiment provides a smart drainage long-lasting filter, including a housing 4, a filter base 1, and a filter element assembly disposed inside the housing 4. The housing is made of transparent material, and the filter base 1 is detachably mounted on the top of the housing 4. Preferably, the filter base 1 and the housing 4 are connected by a stop thread, and a sealing ring is provided at the connection point.

[0043] The filter element 8 includes a filter element frame, a filter element 8, and a hydrophobic filter screen 6. Both the filter element 8 and the hydrophobic filter screen 6 are mounted on the filter element frame, and the filter element 8 is sleeved on the outside of the hydrophobic filter screen 6.

[0044] Specifically, the filter element frame includes a central tube 7, an upper end cap 3, and a lower end cap 9. The upper end cap 3 and the lower end cap 9 are respectively fixedly installed at the upper and lower ends of the central tube 7. The central tube 7 has through holes that allow fuel to pass through. The lower end cap 9 is connected to the bottom of the outer shell 4 through a stop and a sealing ring is provided at the connection. The upper end cap 3 is connected to the bottom of the filter base 1 through a stop and a sealing ring is provided at the connection. The filter element 8 is sleeved on the outside of the central tube 7, and the hydrophobic filter screen 6 is sleeved on the inside of the central tube 7.

[0045] The filter assembly also includes a guide tube 10, which is located inside the hydrophobic filter screen 6. The guide tube 10 is integrally formed with the upper end cover 3 and extends downward from the upper end cover 3 to the middle of the filter element 8. The guide tube is connected to the oil outlet of the filter.

[0046] The bottom of the outer casing 4 is provided with a relatively independent first water collection chamber 14 and a second water collection chamber 16. By setting relatively independent outer and inner water collection chambers, and connecting the outer and inner separation chambers to the outer and inner water collection chambers respectively, this design ensures that the filter element can efficiently block and capture water and solid particles, allowing them to settle smoothly into the outer water collection chamber. This avoids water accumulation in the outer separation chamber and the adhesion of solid particles to the filter element surface. This not only improves the filtration efficiency of the filter element but also extends its service life.

[0047] An outer separation cavity 5 is formed between the filter element 8 and the outer shell 4, and an inner separation cavity 2 is formed between the hydrophobic filter screen 6 and the filter element 8. The inner separation cavity 2 is connected to the second water accumulation chamber 16.

[0048] The outer separation chamber 5 and the first water accumulation chamber 14 are sealed and isolated by an isolation plate 15. A liquid inlet channel 17 is provided between the outer separation chamber 5 and the first water accumulation chamber 14. The first water accumulation chamber 14 is also provided with a liquid outlet channel 18. A solenoid valve assembly 11 is provided at the bottom of the outer shell 4.

[0049] The solenoid valve assembly 11 controls the selective opening and closing of either the liquid inlet channel 17 or the liquid outlet channel 18. Specifically, the solenoid valve assembly includes a first control state and a second control state. The first control state is an energized state, and the second control state is a de-energized state. In the energized state, the solenoid valve assembly 11 controls the liquid inlet channel 17 to close while the liquid outlet channel 18 opens. In the de-energized state, the solenoid valve assembly 11 controls the liquid outlet channel 18 to close while the liquid inlet channel 17 opens. A one-way valve assembly 12 is provided between the first water accumulation chamber 14 and the second water accumulation chamber 16. The one-way valve assembly 12 controls the one-way flow from the second water accumulation chamber 16 to the first water accumulation chamber 14. A water level sensor assembly 13 is provided in the first water accumulation chamber 14. The water level sensor assembly 13 is used to monitor the water level in the first water accumulation chamber 14 and controls the opening and closing of the solenoid valve assembly 11 through the controller.

[0050] It will be readily apparent to those skilled in the art that the drainage structure of this invention is also applicable to various single-chamber filters. In this embodiment, the solenoid valve assembly 11 is a two-position four-way solenoid valve. Figure 2 As shown, the two-position four-way solenoid valve includes a valve body 19 and a valve core 20. The valve body 19 has a valve cavity, and a first input channel 21 and a second output channel 24 are formed on the valve body 19. The valve core 20 is disposed in the valve cavity and is a coaxial valve core 20.

[0051] The valve body 19 has a first output channel 22 connected to the first input channel 21 and a second input channel 23 connected to the second output channel 24 at its upper and lower ends respectively. The first input channel 21 is vertically arranged and its upper end leads to the outer separation chamber. The first output channel 22 is perpendicular to the first input channel 21 and leads to the first water accumulation chamber. The first input channel 21 and the first output channel 22 are connected to form an L-shaped liquid inlet channel 17.

[0052] The second input channel 23 is vertically arranged with its lower end opening to the outside. The second output channel 24 is perpendicular to the second input channel 23 and leads to the first water accumulation chamber 14. The second input channel 23 and the second output channel 24 are connected to form an L-shaped liquid outlet channel 18. The first input channel 21 is connected to the outer separation chamber 5, the first output channel 22 is connected to the first water accumulation chamber 14, the second input channel 23 is connected to the first water accumulation chamber 14, and the second output channel 24 is connected to the outside. The valve core 20 is driven by the electromagnetic coil inside the valve body 19. When energized, it simultaneously closes the first input channel 21 and the second output channel 24. When de-energized, it resets and opens the first input channel 21 and closes the second output channel 24.

[0053] The structure and principle of electromagnetic coil controlling valve core movement are existing technologies and will not be described in this patent.

[0054] Those skilled in the art would readily conceive of using two 2-position 2-way solenoid valves instead of one 2-position 4-way valve to achieve the aforementioned non-stop drainage solution. However, this approach has two major drawbacks: firstly, the manufacturing cost is high; and secondly, the solenoid valve controller circuit is complex, requiring two power supply voltages. Therefore, using one 2-position 4-way solenoid valve is the optimal implementation.

[0055] The upper and lower ends of the valve core 20 are respectively provided with conical sealing surfaces, and the first input channel 21 and the second output channel 24 are provided with matching horn-shaped openings.

[0056] The end of the first input channel 21 at the upper end of the valve body 19 is sealed to the isolation plate 15 by a sealing ring, and the ends of the first output channel 22 and the second input channel 23 of the valve body 19 are sealed to the bottom of the outer casing 4 by a sealing ring.

[0057] The water level sensor assembly 13 is one of the following: photoelectric, float, capacitive, probe, cable, and ultrasonic water level sensors. Preferably, in this embodiment, the water level sensor is a float-type water level sensor. The working principle of the float-type water level sensor is based on Archimedes' principle of buoyancy. When the liquid level changes, the float moves up and down accordingly. The magnet inside the float attracts the reed switch inside the sensor, causing a linear change in the resistance inside the sensor. The transmitter converts this change into a standard current signal output, thereby realizing the detection and control of the liquid level.

[0058] In this embodiment, the one-way valve assembly 12 is a pressure-to-gravity one-way valve. The water collected in the second water collection chamber 16 has a higher purity and specific gravity than that in the first water collection chamber 14. Because the second water collection chamber 16 has negative pressure, under any dynamic conditions, the sewage in the first water collection chamber 14 cannot enter the second water collection chamber 16. The pressure-to-gravity one-way valve will only open when the water level in the second water collection chamber 16 is higher than that in the first water collection chamber 14 or when the specific gravity of the water collected in the second water collection chamber 16 is greater than that in the first water collection chamber 14.

[0059] When the water in the first water chamber 14 is drained and the solenoid valve assembly 11 is de-energized and reset, the oil in the outer separation chamber 5 gradually enters the first water chamber 14. When the oil pressure in the outer separation chamber 5 is lower than required or air is generated, the electric pump will then start pumping oil.

[0060] A control method using the intelligent drainage long-life filter in Example 1 includes the following steps:

[0061] S1. The water level of the first water accumulation chamber 14 is monitored in real time by the water level sensor component 13. When the water level reaches the preset upper limit threshold, the water level sensor component 13 generates a first control command.

[0062] S2. In response to the first control command, the controller triggers the solenoid valve assembly 11 to synchronously perform the following actions:

[0063] Close the liquid inlet channel 17 to block the connection between the outer separation chamber 5 and the first water accumulation chamber 14;

[0064] Open the liquid outlet channel 18 to discharge the sewage in the first water collection chamber 14 to the outside;

[0065] S3. When the water level in the first water accumulation chamber 14 drops to a preset lower threshold, the water level sensor generates a second control command.

[0066] S4. In response to the second control command, the controller triggers the solenoid valve assembly 11 to synchronously perform the following actions:

[0067] Close liquid outlet channel 18 to stop drainage;

[0068] Open the liquid inlet channel 17, and the sewage in the outer separation chamber 5 re-enters the first water accumulation chamber 14.

[0069] The drainage methods S1 to S4 described above can be implemented whether the machine is stopped or not.

[0070] Through the above technical solutions, such as Figure 4 As shown, when the engine is running, the wastewater filtered out by the filter element 8 enters the first water chamber 14 from the outer separation chamber 5 through the liquid inlet channel 17, while the emulsified water separated by the hydrophobic filter screen 6 enters the second water chamber 16 from the inner separation chamber 2. Figure 5 As shown, when the sewage in the first water collection chamber 14 reaches a certain level, the water level sensor assembly 13 detects that the sewage in the first water collection chamber 14 has reached the upper threshold. The water level sensor assembly 13 outputs a voltage signal, which triggers the solenoid valve assembly 11 to be energized through the controller. After the solenoid valve assembly 11 is energized, it controls the liquid inlet channel 17 to close and the liquid outlet channel 18 to open, so that the sewage in the first water collection chamber 14 is discharged to the outside. At this time, the engine is still running. Since the first water collection chamber 14 is isolated and sealed from the outer separation chamber 5, and the one-way valve assembly 12 is closed under the action of negative pressure inside the second water collection chamber 16, the first water collection chamber 14 forms an independent discharge space. When the engine is running, no air will enter the outer and inner separation chambers 2 of the filter, which can effectively prevent air backflow, thereby realizing the mode of drainage without stopping the engine.

[0071] As the sewage is discharged, the water level sensor assembly 13 detects that the sewage in the first water accumulation chamber 14 has reached the lower threshold. The water level sensor assembly 13 outputs no voltage signal, and the solenoid valve assembly 11 is de-energized and reset, thus re-establishing the lower threshold. Figure 4 In this state, the liquid outlet channel 18 is closed while the liquid inlet channel 17 is opened, and the blocked sewage re-enters the first water accumulation chamber 14 from the outer separation chamber 5.

[0072] The one-way valve assembly works as follows: when the water level in the first water chamber 14 is lower than that in the second water chamber 16, or when the specific gravity of the water in the second water chamber 16 is greater than that in the first water chamber 14, the one-way valve assembly 12 opens, allowing water from the second water chamber 16 to enter the first water chamber 14. Conversely, when the water level in the second water chamber 16 is lower than that in the first water chamber 14, the one-way valve assembly 12 closes.

[0073] When water from the second water chamber enters the first water chamber through the one-way valve assembly, there are two operating scenarios: 1. At the moment the engine is shut down, the filter changes from a negative pressure state to a normal state. At this time, due to the backflow pressure, the one-way valve assembly opens instantaneously, and some of the water in the second water chamber is pushed into the first water chamber; 2. When the engine stops, if the water level in the second water chamber is higher than that in the first water chamber, the specific gravity pressure of the water in the second water chamber is naturally greater than that in the first water chamber. Due to the difference in specific gravity, the pre- and post-filters achieve a balanced circulation, and the water in the second water chamber gradually enters the first water chamber, while the pre-filter diesel fuel passes through the filter element and enters the central pipe.

[0074] Through this embodiment 1, the filter of the present invention has the following advantages when draining water:

[0075] 1. Drainage without stopping the engine: By using the bidirectional synchronous closing and opening action of the solenoid valve assembly 11, combined with the sealing and isolation of the sewage chamber by the isolation plate 15, the engine can complete the drainage operation while running continuously, completely eliminating the limitation of traditional technology that requires stopping the engine for operation.

[0076] 2. Isolation drainage: The bidirectional coaxial linkage design of the solenoid valve assembly 11 ensures that the liquid inlet channel 17 closes and the liquid outlet channel 18 opens synchronously. Together with the independent drainage space formed by the isolation plate 15, the connection between the external air and the filter cavity is blocked throughout the drainage process.

[0077] 3. Gravity-based drainage: The pressure-gravity check valve automatically opens and closes based on the water level difference and specific gravity difference between the first water chamber 14 and the second water chamber 16.

[0078] Example 2

[0079] A further technical solution of this embodiment compared to Embodiment 1 is that, as Figure 3 As shown, in order to facilitate the rapid discharge of sewage from the first water collection chamber 14 and balance the pressure inside the first water collection chamber 14, the first water collection chamber is also connected to an air intake channel. The opening and closing of the air intake channel is controlled by a solenoid valve assembly. Preferably, the valve body 19 of the two-position four-way solenoid valve is provided with an air intake channel 25 that is connected to the first output channel 22. When the two-position four-way solenoid valve is de-energized, the air intake channel 25 is closed. When the two-position four-way solenoid valve is energized, the air intake channel 25 is open. During the drainage process, gas enters the first water collection chamber from the air intake channel to balance the pressure inside the first water collection chamber, so that the sewage inside the first water collection chamber can be discharged quickly.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A smart drainage long-lasting filter, characterized in that: The system includes a housing (4) and a filter element assembly disposed inside the housing (4). The filter element assembly includes a filter element frame, a filter element (8), and a hydrophobic filter screen (6). The filter element (8) and the hydrophobic filter screen (6) are both mounted on the filter element frame. The filter element (8) is sleeved on the outside of the hydrophobic filter screen (6). The bottom of the housing (4) is provided with a relatively independent first water collection chamber (14) and a second water collection chamber (16). An outer separation chamber (5) is formed between the filter element (8) and the housing (4). An inner separation chamber (2) is formed between the hydrophobic filter screen (6) and the filter element (8). The inner separation chamber (2) is connected to the second water accumulation chamber (16), the outer separation chamber (5) is sealed and isolated from the first water accumulation chamber (14) by a partition plate (15), a liquid inlet channel (17) is provided between the outer separation chamber (5) and the first water accumulation chamber (14), and a liquid outlet channel (18) is provided between the first water accumulation chamber (14) and the outside of the outer shell. The bottom of the outer shell (4) is provided with a solenoid valve assembly (11), and the first water chamber (14) is provided with a water level sensor assembly (13). The water level sensor assembly (13) is used to monitor the water level of the first water chamber (14) in real time and control the opening and closing of the solenoid valve assembly (11) through the controller. The solenoid valve assembly (11) controls the selective opening and closing of the liquid inlet channel (17) and the liquid outlet channel (18). A one-way valve assembly (12) is provided between the first water chamber (14) and the second water chamber (16). The one-way valve assembly (12) controls the one-way flow from the second water chamber (16) to the first water chamber (14).

2. The intelligent drainage long-lasting filter according to claim 1, characterized in that: The solenoid valve assembly (11) is a two-position four-way solenoid valve.

3. The intelligent drainage long-lasting filter according to claim 2, characterized in that: The two-position four-way solenoid valve includes a valve body (19) and a valve core (20). A valve cavity is formed inside the valve body (19), and the valve cavity extends through the valve body (19). A first input channel (21) and a second output channel (24) are formed on the valve body (19). The valve core (20) is disposed in the valve cavity and is a coaxial valve core (20). A first output channel (22) communicating with the first input channel (21) and a second input channel (23) communicating with the second output channel (24) are respectively formed at the upper and lower ends of one side of the valve body (19). The first input channel (21) and the first output channel (22) are connected to form an L-shaped liquid. The inlet channel (17), the second input channel (23) and the second output channel (24) are connected to form an L-shaped liquid outlet channel (18). The first input channel (21) is connected to the outer separation chamber (5), the first output channel (22) is connected to the first water accumulation chamber (14), the second input channel (23) is connected to the first water accumulation chamber (14), and the second output channel (24) is connected to the outside. The valve core (20) is driven by the electromagnetic coil inside the valve body (19). When energized, the first input channel (21) and the second output channel (24) are closed simultaneously. When de-energized, the first input channel (21) is opened by spring reset and the second output channel (24) is closed.

4. The intelligent drainage long-lasting filter according to claim 3, characterized in that: The valve core (20) is provided with conical sealing surfaces at its upper and lower ends, and the first input channel (21) and the second output channel (24) are provided with matching horn-shaped openings.

5. A smart drainage long-lasting filter according to claim 3, characterized in that: The end of the first input channel (21) at the upper end of the valve body (19) is sealed to the isolation plate (15) by a sealing ring (10), and the ends of the first output channel (22) and the second input channel (23) of the valve body (19) are sealed to the bottom of the outer shell (4) by a sealing ring (10).

6. The intelligent drainage long-lasting filter according to claim 1, characterized in that: The first water chamber (14) is also connected to the air intake channel (25), and the opening and closing of the air intake channel (25) is controlled by the solenoid valve assembly (11).

7. A smart drainage long-lasting filter according to any one of claims 1-6, characterized in that: The one-way valve assembly (12) is a pressure-specific gravity one-way valve.

8. A smart drainage long-lasting filter according to claim 7, characterized in that: The water level sensor assembly (13) is one of photoelectric, float, capacitive, probe, cable and ultrasonic water level sensors.

9. A smart drainage long-lasting filter according to claim 8, characterized in that: The filter element frame includes a central tube (7), an upper end cap (3) and a lower end cap (9). The upper end cap (3) and the lower end cap (9) are fixedly installed on the upper and lower ends of the central tube (7), respectively. The central tube (7) has through holes that allow fuel to pass through. The filter element (8) is sleeved on the outside of the central tube (7), and the hydrophobic filter screen (6) is sleeved on the inside of the central tube (7).

10. A control method for a smart drainage long-life filter according to any one of claims 1-5, characterized in that, Includes the following steps: S1. When the engine is running, the water level in the first water chamber (14) is monitored in real time by the water level sensor component (13). When the water level reaches the preset upper limit threshold, the water level sensor component (13) generates the first control command. S2. In response to the first control command, the controller triggers the solenoid valve assembly (11) to synchronously perform the following actions: Close the liquid inlet channel (17) to block the connection between the outer separation chamber (5) and the first water accumulation chamber (14); Open the liquid outlet channel (18) to discharge the sewage in the first water collection chamber (14) to the outside; S3. When the water level in the first water chamber (14) drops to a preset lower threshold, the water level sensor generates a second control command. S4. The controller responds to the second control command and triggers the solenoid valve assembly (11) to synchronously perform the following actions: Close the liquid outlet channel (18) and stop drainage; Open the liquid inlet channel (17) and the sewage in the outer separation chamber (5) re-enters the first water collection chamber (14).

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