A hydraulic system pipeline oil liquid filtering device

Abstract

The utility model provides a kind of oil liquid filtering device for hydraulic system pipeline, belong to hydraulic technology field. Including filter shell, still include: filter element assembly, set in filter shell, including magnetic filter screen, coarse filter screen, fine filter screen;Several dirt collecting boxes are set in filter shell bottom;Scrape dirty component is set on filter shell, including several scrapers placed above dirt collecting box, and filter shell top is equipped with multiple electric push rods. The utility model integrates magnetic filtration, coarse filtration and fine filtration, greatly improves the cleanliness of oil liquid;By setting scrape dirty component, the scraper driven by multiple electric push rods can clean the blocked filter screen online under the condition that hydraulic system does not stop, combined with the automatic control of differential pressure indicator, avoids the production interruption caused by shutdown replacement filter element, significantly improves the utilization rate and production efficiency of device, without frequent manual intervention cleaning or replacing filter element assembly, effectively prolongs the service life of filter element assembly.

Description

Technical Field

[0001] This utility model provides an oil filtration device for hydraulic system pipelines, belonging to the field of hydraulic technology. Background Technology

[0002] Hydraulic systems use hydraulic oil as the working medium for energy transfer, conversion, and control. However, during circulation, hydraulic oil inevitably becomes contaminated with various pollutants, such as external dust and moisture, metal particles from worn internal components, rubber debris from aging seals, and gel-like substances from oil oxidation. Statistics show that over 75% of hydraulic system failures are caused by oil contamination. These contaminants accelerate the wear of hydraulic components such as pumps, valves, and cylinders, clog throttle orifices and filters, leading to component malfunctions, unstable system pressure, and increased oil temperature, ultimately shortening system lifespan and potentially causing safety accidents. Therefore, installing a high-efficiency oil filtration device in the hydraulic system is crucial for ensuring system cleanliness, improving operational reliability, and extending service life.

[0003] Currently, most hydraulic oil filters on the market can meet normal usage needs, but they still have the following shortcomings: most filters rely solely on filter element assemblies for filtration, but these assemblies lack automatic cleaning functions. When the filter element becomes clogged, frequent manual intervention, such as stopping the machine, is often required to clean or replace the filter element assembly. This results in low equipment utilization and reduced production efficiency, and frequent cleaning also shortens the lifespan of the filter element assembly. Therefore, this invention provides an oil filtration device for hydraulic system pipelines. Utility Model Content

[0004] The technical problem solved by this utility model is that the filter element assembly does not have an automatic cleaning function, and relies on frequent manual shutdowns for cleaning or replacement of the filter element assembly, resulting in low equipment utilization and reduced production efficiency, and frequent cleaning reduces the service life of the filter element assembly.

[0005] To solve the technical problem, the technical solution provided by this utility model is as follows: an oil filtration device for hydraulic system pipelines, comprising a filter housing, an oil inlet on one side wall of the filter housing, an oil outlet on the other side wall of the filter housing, and further comprising:

[0006] The filter element assembly is disposed inside the filter housing and includes a magnetic filter screen, a coarse filter screen, and a fine filter screen that are slidably connected to the inner wall of the filter housing.

[0007] Several dirt collection boxes, located at the bottom of the filter housing, are used to collect dirt scraped off the filter cartridge assembly.

[0008] The sludge scraping assembly, mounted on the filter housing, includes several scrapers positioned above the sludge collection box and attached to the side walls of the magnetic filter screen, coarse filter screen, and fine filter screen. The top of the filter housing is provided with a multi-section electric push rod for driving the scrapers to move back and forth.

[0009] Furthermore, the telescopic rod end of the multi-section electric push rod is provided with an L-shaped connecting plate placed on the outside of the filter housing, and the side wall of the scraper is provided with a connecting rod that passes through the side wall of the filter housing and is fixedly connected to the side wall of the L-shaped connecting plate.

[0010] Furthermore, a bypass pipe is provided on the side wall of the filter housing, with the two ends of the bypass pipe located on both sides of the filter element assembly, and a switch valve is provided on the bypass pipe.

[0011] Furthermore, the filter housing is equipped with a differential pressure indicator, which is connected to the oil inlet side and the oil outlet side of the filter housing to display the pressure difference between the two ends of the filter element assembly in real time.

[0012] Furthermore, the two side walls of the magnetic filter screen, the two side walls of the coarse filter screen, and the two side walls of the fine filter screen are all provided with limiting rails that match the inner side wall of the filter housing.

[0013] Furthermore, the top of the filter housing is provided with an inspection port positioned above the filter element assembly, and the top of the filter housing is provided with a top cover that matches the inspection port for pressing down the filter element assembly.

[0014] The beneficial effects of this utility model are:

[0015] This device integrates magnetic filtration, coarse filtration, and fine filtration, greatly improving the cleanliness of the oil. By setting up a scraping component, the multi-section electric push rod driven scraper can clean the clogged filter screen online without stopping the hydraulic system. Combined with the automatic control of the differential pressure indicator, it avoids production interruptions caused by downtime to replace the filter element, significantly improving the utilization rate and production efficiency of the device. It eliminates the need for frequent manual intervention to clean or replace the filter element assembly, effectively extending the service life of the filter element assembly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an oil filtration device for hydraulic system pipelines according to the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of an oil filtration device for hydraulic system pipelines according to the present invention. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the structure of an oil filtration device for hydraulic system pipelines according to the present invention. Figure 3 .

[0019] Figure 4 This is a schematic diagram of the coarse filter screen structure of an oil filtration device for hydraulic system pipelines according to this utility model.

[0020] Figure 5 This is a plan view of an oil filtration device for hydraulic system pipelines according to the present invention.

[0021] 1. Filter housing; 2. Oil inlet; 3. Oil outlet; 4. Filter element assembly; 5. Magnetic filter screen; 6. Coarse filter screen; 7. Fine filter screen; 8. Sludge collection box; 9. Sludge scraping assembly; 10. Scraper; 11. Multi-section electric push rod; 12. L-shaped connecting plate; 13. Connecting rod; 14. Bypass pipe; 15. Differential pressure indicator; 16. Limit rail; 17. Top cover. Detailed Implementation

[0022] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may vary depending on their location and usage; thus, these or other directional terms should not be interpreted as restrictive terms.

[0023] The singular forms “a,” “the,” and “the” used in this specification are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes one or more of the associated listed items, any or all possible combinations thereof.

[0024] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] According to the appendix Figure 1 , 4As shown in Figure 5: This utility model provides an oil filtration device for hydraulic system pipelines: it includes a filter housing 1, which is made of 316L stainless steel that is resistant to high pressure and corrosion. The wall thickness is designed according to the highest working pressure of the system (e.g., 31.5MPa) to ensure sufficient strength. One side wall of the filter housing 1 has an oil inlet 2, and the other side wall of the filter housing 1 has an oil outlet 3. Both the inlet and outlet adopt the DN80 flange connection method of PN40 standard for easy docking with the field pipeline. It also includes a filter element assembly 4, which is set inside the filter housing 1. It includes a magnetic filter screen 5, a coarse filter screen 6, and a fine filter screen 7 that are slidably connected to the inner wall of the filter housing 1. The two side walls of the magnetic filter screen 5, the two side walls of the coarse filter screen 6, and the two side walls of the fine filter screen 7 are all connected to the inner wall of the filter housing 1. The matching limit rail 16 serves as a limit. Specifically, the magnetic filter 5 can strongly adsorb micron-sized ferromagnetic wear particles in the oil. The coarse filter 6 is located in the middle layer and is made of multi-layer stainless steel sintered mesh with a filtration accuracy of 100 microns. It is used to intercept larger solid particle impurities and protect the downstream fine filter 7. The fine filter 7 has a filtration accuracy of 10 microns and is used to intercept tiny particles to ensure the high cleanliness of the final output oil. During normal operation, the hydraulic oil to be filtered enters the chamber of the filter housing 1 from the oil inlet 2, and then passes through the magnetic filter 5, coarse filter 6, and fine filter 7 set inside the filter housing 1. The filtered clean oil collects in the upper chamber and flows out from the oil outlet 3, returning to the hydraulic system.

[0026] As per the instruction manual Figure 2 , 5 As shown: It also includes a scraping assembly 9, which is set on the filter housing 1. It includes several scrapers 10 placed above the sludge collection box 8 and attached to the side walls of the magnetic filter screen 5, coarse filter screen 6, and fine filter screen 7. The scrapers are made of wear-resistant and oil-resistant polyurethane material. The top of the filter housing 1 is provided with a multi-section electric push rod 11 for driving the scrapers 10 to move back and forth. The telescopic rod end of the multi-section electric push rod 11 is provided with an L-shaped connecting plate 12 placed on the outside of the filter housing 1. The side wall of the scraper 10 is provided with a connecting rod 13 that passes through the sealing sleeve on the side wall of the filter housing 1 and is fixedly connected to the side wall of the L-shaped connecting plate 12. The sealing sleeve adopts existing technology to prevent oil leakage. Specifically, starting the multi-section electric push rod 11 drives the L-shaped connecting plate 12 to move back and forth, which in turn drives the connecting rod 13 and the scraper 10 to move back and forth.

[0027] As per the instruction manual Figure 1 , 3As shown: A bypass pipe 14 is provided on the side wall of the filter housing 1. The two ends of the bypass pipe 14 are located on both sides of the filter element assembly 4. A switch valve is provided on the bypass pipe 14. When the system needs to operate urgently and the filter cannot work properly, this valve can be manually opened to allow the oil to flow around the filter element assembly 4, ensuring the continuity of the main system. A differential pressure indicator 15 is provided on the filter housing 1. The two pressure detection ports of the differential pressure indicator 15 are connected to the oil inlet side and the oil outlet side of the filter housing 1, respectively, to display the pressure difference across the filter element assembly 4 in real time. It can also issue an alarm signal when the pressure difference reaches a preset threshold and output an electrical signal to the control system. The control system has two threshold levels.

[0028] Cleaning threshold, for example, 0.4 MPa: When the differential pressure reaches this value, the differential pressure indicator 15 outputs a switch signal to the PLC controller, automatically starting the multi-section electric push rod 11 to perform one or more scraping cycles. After the scraping is completed, the differential pressure drops and the push rod stops.

[0029] Alarm threshold, for example, 0.5MPa: If the differential pressure does not decrease or continues to increase after multiple scraping cycles (indicating that the filter element may be severely damaged or the contaminant may be of special nature), the differential pressure indicator 15 will trigger an audible and visual alarm and output an alarm signal to prompt the operator to perform manual inspection or maintenance.

[0030] As per the instruction manual Figure 1 , 3 As shown in Figure 5, the filter housing 1 also includes several collection boxes 8 for collecting dirt scraped off the filter element assembly 4. These boxes are located at the bottom of the filter housing 1. The top of the filter housing 1 has an inspection port positioned above the filter element assembly 4. The top of the filter housing 1 has a top cover 17 that matches the inspection port and is used to press down the filter element assembly 4. The top cover 17 is fixedly connected to the top of the filter housing 1 by bolts. The filter housing 1 and the top cover 17 are sealed by an oil-resistant and high-temperature-resistant O-ring, which facilitates the disassembly and replacement of the filter element assembly 4 and also makes it easy to clean the dirt collected in the collection boxes 8.

[0031] The control method of this utility model is through a programmable PLC controller. The controller adopts existing mature technology, which is not shown in the figure and will not be described in detail here. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0032] The principle of this utility model

[0033] During use, when the system is running normally, the hydraulic oil to be filtered enters the chamber of the filter housing 1 from the oil inlet 2, and then passes through the magnetic filter screen 5, coarse filter screen 6, and fine filter screen 7 set inside the filter housing 1. The filtered clean oil is collected in the upper chamber and flows out from the oil outlet 3, returning to the hydraulic system.

[0034] As operating time accumulates, the amount of contaminants trapped on the filter element surface will gradually increase, leading to increased resistance to oil flow. This manifests as a continuous rise in the pressure difference ΔP between the inlet and outlet. The differential pressure indicator 15 monitors this change in real time and triggers an automatic cleaning program based on preset logic.

[0035] Triggering condition: The PLC controller sets a cleaning threshold, such as 0.4MPa. When the differential pressure indicator 15 detects that the differential pressure reaches or exceeds this value, it will output a switch signal to the PLC controller.

[0036] Cleaning execution: After receiving the signal, the PLC immediately executes the preset cleaning subroutine, which sends a start command to the multi-section electric push rod 11;

[0037] Mechanical action: The telescopic rod of the multi-section electric push rod 11 moves, driving the scraper 10, which is in close contact with the three-stage filter screen, to reciprocate once or multiple times along the surface of the filter screen through the L-shaped connecting plate 12 and the connecting rod 13;

[0038] Pollutant stripping and collection: Under the mechanical action of the scraper, the pollutants attached to the surface of the magnetic filter screen, coarse filter screen and fine filter screen are effectively scraped off and settled into the collection box 8 located at the bottom of the shell under the action of gravity.

[0039] End of cycle and verification: After the scraping cycle is completed, the flow path of the oil becomes unobstructed, and the pressure difference drops significantly. The pressure difference indicator 15 detects that the pressure difference has fallen back below the cleaning threshold. The PLC controls the multi-section electric push rod 11 to stop running, and the device returns to the normal monitoring and filtration state.

[0040] This device integrates magnetic filtration, coarse filtration, and fine filtration. The magnetic filter screen 5 can preferentially and efficiently adsorb ferromagnetic wear particles that are extremely harmful to hydraulic components. The coarse filter screen 6 and fine filter screen 7 intercept solid particles and colloids of different sizes in stages, greatly improving the cleanliness of the oil. By setting up a scraping component 9, the scraper 10 driven by the multi-section electric push rod 11 can clean the clogged filter screen online without stopping the hydraulic system. Combined with the automatic control of the differential pressure indicator 15, it avoids production interruptions caused by stopping the machine to replace the filter element, significantly improving the utilization rate of the device and production efficiency. It eliminates the need for frequent manual intervention to clean or replace the filter element assembly, effectively extending the service life of the filter element assembly.

[0041] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A hydraulic system pipeline oil filtration device, comprising a filter housing (1), wherein an oil inlet (2) is provided on one side wall of the filter housing (1), and an oil outlet (3) is provided on the other side wall of the filter housing (1), characterized in that: Also includes: The filter element assembly (4) is disposed inside the filter housing (1) and includes a magnetic filter screen (5), a coarse filter screen (6), and a fine filter screen (7) that are slidably connected to the inner wall of the filter housing (1); Several dirt collection boxes (8) for collecting dirt scraped off the filter cartridge assembly (4) are located at the bottom of the filter housing (1); The sludge scraping assembly (9) is set on the filter housing (1) and includes several scrapers (10) placed above the sludge collection box (8) and attached to the side walls of the magnetic filter screen (5), coarse filter screen (6) and fine filter screen (7). The top of the filter housing (1) is provided with a multi-section electric push rod (11) for driving the several scrapers (10) to move back and forth.

2. The hydraulic system oil filter device according to claim 1, characterized in that: The telescopic rod end of the multi-section electric push rod (11) is provided with an L-shaped connecting plate (12) placed outside the filter housing (1), and the side wall of the scraper (10) is provided with a connecting rod (13) that passes through the side wall of the filter housing (1) and is fixedly connected to the side wall of the L-shaped connecting plate (12).

3. The hydraulic system oil filter device according to claim 1, characterized in that: The filter housing (1) has a bypass pipe (14) connected to it on its side wall. The two ends of the bypass pipe (14) are located on both sides of the filter element assembly (4). The bypass pipe (14) is equipped with a switch valve.

4. The hydraulic system oil filter device according to claim 1, characterized in that: The filter housing (1) is provided with a differential pressure indicator (15), which is connected to the oil inlet side and the oil outlet side of the filter housing (1) and is used to display the pressure difference between the two ends of the filter element assembly (4) in real time.

5. The hydraulic system pipeline oil filtration device according to claim 1, characterized in that: The magnetic filter screen (5), the coarse filter screen (6), and the fine filter screen (7) are all provided with limiting rails (16) that match the inner wall of the filter housing (1).

6. The hydraulic system oil filter device of claim 1, wherein: The filter housing (1) has an inspection port on top, which is located above the filter element assembly (4). The filter housing (1) also has a top cover (17) that matches the inspection port and is used to press down the filter element assembly (4).

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