In the high-pressure hydraulic system of the steam turbine, hydraulic oil is the medium for power transmission and control, and its purity directly affects the operating stability of the system and the service life of the equipment. As a key filtering device, the YD0110D10BN/HC high pressure filter element achieves reliable performance under extreme working conditions through a unique material combination and structural design.

1. Structural combination of material systems

The filter element YD0110D10BN/HC adopts a bimetallic layer composite structure, with the outer layer being a 304 stainless steel perforated protective net and the inner layer being a 316L stainless steel support net. The bimetallic layer design achieves dual guarantees of mechanical strength and corrosion resistance. 304 stainless steel has excellent formability and economy, and the punching structure forms the first mechanical protection while ensuring the flow area. The inner layer 316L stainless steel support net has a higher molybdenum content and exhibits better resistance to pitting and crevice corrosion under high temperature and high pressure environments. This bimetallic synergistic protection enables the filter element to maintain structural integrity in the high-temperature oil environment of the steam turbine.

The filter medium adopts gradient sintered ultrafine fiber composite felt, which forms a three-dimensional mesh structure through the layer-by-layer stacking of nano-scale fibers. This gradient structure makes the filter material have a clear pore size distribution feature. The surface fiber diameter is controlled at 3-5μm to form a pre-filtration layer, the middle fiber is refined to 1-2μm to achieve deep interception, and the bottom 0.5-1μm ultra-fine fiber constitutes a fine filtration barrier. This progressive filtration structure effectively disperses the impact force of the oil and avoids the stress concentration phenomenon of traditional homogeneous filter materials.

The end cover assembly is made of integral forged aluminum alloy. After heat treatment, the tensile strength reaches 310MPa, which is about 40% higher than that of conventional cast end covers. The sealing groove is precision-machined by CNC and cooperates with fluororubber O-rings to form a double sealing system. This metal-elastomer composite sealing structure can still maintain 0 leakage under a working pressure of 25MPa, which is significantly better than the conventional single sealing structure.

2. Structural mechanics optimization design

The fluid dynamics design adopts an asymmetric guide vane structure, and a 15° inclined guide plate is set at the inlet of the hydraulic filter element YD0110D10BN/HC to form a spiral flow trajectory when the oil enters. This design reduces the linear flow rate from the conventional 3m/s to 1.2m/s, effectively reducing the impact of turbulence on the filter material. The micron-level roughness formed by shot peening on the surface of the guide plate promotes the formation of stable laminar flow in the boundary layer fluid, reducing the flow resistance by 18%.

The impact-resistant design includes a dynamic damping system, and a disc spring buffer device is integrated inside the filter element. When the system pressure fluctuation exceeds the set threshold, the spring group absorbs the impact energy through 0.1mm elastic deformation, attenuating the pressure peak by more than 60%. Compared with the traditional rigid structure, this active buffer mechanism significantly improves the structural reliability of the filter element under transient impact.

3. Advanced Manufacturing Process Integration

The welding process adopts laser seamless welding technology, and the weld penetration is controlled in the range of 0.8-1.2mm. Compared with traditional argon arc welding, the welding strength is increased by 25% and there is no spatter residue. The surface roughness of the weld after electrolytic polishing is Ra≤0.4μm, eliminating stress concentration points. This precision welding ensures the structural durability of the filter element under high-pressure cyclic loads.

The sintering process uses gradient temperature control technology to achieve three-stage precise temperature control in a protective atmosphere furnace. In the initial stage, the temperature is raised to 650℃ at a rate of 10℃/min to complete the fiber shaping. In the second stage, the temperature is raised to 850℃ at a rate of 5℃/min to achieve interface metallurgical bonding. The final stage is kept at 920℃ for 30 minutes to form a stable crystal structure. This controlled sintering process maximizes the fiber bonding strength.

Through material system optimization, structural mechanics innovation and advanced process integration, the hydraulic filter element YD0110D10BN/H has formed a multi-dimensional structural reinforcement system. This design concept not only improves the structural reliability of the filter element itself, but also provides long-term and stable filtration guarantee for the high-pressure system of the turbine.

When looking for high-quality, reliable steam turbine oil filters, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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