XNJ series box return oil filter

The XNJ series in tank return oil filter is a built-in return oil purification device designed specifically for the internal space of hydraulic system oil tanks. It adopts a fully enclosed embedded installation structure and is completely arranged below the oil level inside the oil tank. Only the top maintenance interface and transmitter are exposed on the oil tank cover plate. The system return oil is directly connected to the filter inlet from the return oil port on the side wall of the oil tank. After purification, the oil is directly discharged into the oil tank without the need for any additional filtering pipelines outside the tank, completely eliminating the risk of external pipeline leakage of the external return oil filter. It is suitable for various integrated hydraulic stations that require high utilization of external space and pursue minimalist layout of oil circuits.

The XNJ series box return oil filter adopts a large folding area fiberglass or stainless steel filter element, combined with a circular strong magnetic adsorption component, to form a composite purification path of "strong magnetic pre interception of iron filings+precision filter element full flow filtration", which efficiently covers the interception needs of pollutants of different particle sizes while ensuring the large oil capacity; The built-in bypass valve has an opening pressure of 0.3 MPa. When the filter element is clogged and the pressure difference exceeds the limit, or when the oil viscosity is too high during low-temperature cold start, the bypass valve will automatically open to prevent the filter element from being punctured by high pressure and causing secondary oil pollution; Equipped with a pressure differential transmitter with a trigger threshold of 0.3MPa, the signal end is directly led out to the outside of the fuel tank, and the operation and maintenance personnel can intuitively grasp the clogging status of the filter element without opening the fuel tank cover plate; A dedicated liquid flow buffering and diffusion structure is installed at the bottom, and the purified oil is discharged into the oil tank at a gentle flow rate to avoid stirring the pollutants deposited at the bottom of the tank, while significantly reducing the generation of oil return bubbles and lowering the probability of air mixing into the system.

The XNJ series in box oil return filter is widely suitable for various integrated hydraulic systems with built-in oil return purification links. It can be used in compact CNC equipment hydraulic stations, automated production line hydraulic power units, small construction machinery built-in hydraulic circuits, precision machine tool hydraulic control systems, medical specialized hydraulic equipment, laboratory hydraulic testing benches and other working conditions. It is particularly suitable for work scenarios where the external installation space of the oil tank is extremely limited and high requirements are placed on the overall cleanliness and leak prevention of the system. It can complete full flow purification of the return oil without occupying external space, effectively extending the service life of hydraulic oil and core hydraulic components.

Compared to external conventional oil return filters, the XNJ series internal oil return filter completely eliminates the need for an external oil return filter pipeline, resulting in a more compact system layout and a significant reduction in the number of leakage points, thereby reducing the probability of oil leakage failures from a structural perspective; The design of a large capacity pollution filter element increases the pollutant holding capacity by more than 45% compared to external filters of the same precision, effectively extending the filter element replacement cycle and reducing long-term operation and maintenance costs; The fully enclosed embedded structure will not be affected by external bumps or disturbances, greatly improving operational stability; The top is equipped with a quick opening maintenance cover, which allows for easy removal of the filter element by simply opening the corresponding cover plate on the top of the fuel tank during maintenance. There is no need to disassemble external pipelines, and a single person can quickly complete the core replacement operation, greatly reducing the downtime for maintenance.

The differential pressure transmitter frequently triggers an alarm. First, check if there is a short-term flow overload in the system. If the flow parameters are stable, it indicates that the filter element has reached the blockage limit. Open the top maintenance cover of the fuel tank and replace it with a new filter element of the same precision to restore normal operation; During low-temperature cold start, the oil return resistance is significantly higher, which is a normal phenomenon of increased oil viscosity in low-temperature environments. After the system runs for a period of time and the oil temperature rises, the resistance will naturally fall back to the normal range; The bubble content in the fuel tank has significantly increased. Check whether the bottom liquid flow diffusion structure is blocked or deformed, and clean the impurities attached to the diffusion channel to restore the smooth flow of the return oil; When the filter element is removed, there is local damage on the surface. Check whether the bypass valve is stuck, clean the impurities attached to the valve body, and avoid direct impact of system high pressure on the filter element to solve the problem.