As the core power equipment of modern power industry and large industrial devices, the stability of the lubrication and hydraulic control system of the steam turbine is directly related to the reliability and safety of the unit operation. As the core component of the lubrication system, the main oil pump undertakes the key task of providing stable oil pressure for the turbine bearings and speed control system. In the main oil pump discharge system, the reliability of the oil filter element Ap1E101-01D03V/Wf is particularly important – especially under extreme conditions where the discharge flow rate suddenly changes, how to achieve transient protection of the filter element through design to avoid structural damage or filtration failure caused by pressure shock has become a core issue to ensure the long-term stable operation of the system.

1. Functions and structural features of the main oil pump discharge filter element

The core function of the main oil pump discharge filter element Ap1E101-01D03V/Wf is to intercept solid particle contaminants in the oil to prevent them from entering the turbine bearings, servo valves and other precision parts to cause wear or jamming, which can effectively extend the service life of hydraulic components.

The filter element adopts a multi-layer composite structure design, mainly including the following key components:

High-precision filter layer: composed of metal fiber or resin impregnated filter paper, with high dirt holding capacity and pressure difference resistance.

Support skeleton: stainless steel ring support structure to ensure the shape stability of the filter element under high pressure difference.

Sealing element: fluororubber or silicone sealing ring to prevent oil bypass leakage.

Anti-pressure differential bypass valve: integrated inside the filter element or shell, automatically opens when the pressure difference exceeds the limit to prevent the filter element from rupturing due to instantaneous high pressure.

2. Challenges of sudden changes in oil discharge flow

The sudden change in the main oil pump discharge flow is usually triggered by the following reasons:

• - Rapid changes in system load: Under conditions such as emergency shutdown of the turbine and load shedding, the hydraulic system needs to respond quickly, resulting in drastic fluctuations in the oil discharge flow.
• - Oil circuit switching or valve malfunction: The sudden opening/closing of the control valve in the oil circuit may cause a step change in flow.
• - Sudden change in oil temperature: The viscosity of the oil changes with temperature, causing the volumetric efficiency of the pump to change, thereby affecting the flow output.

The impact effect of sudden flow rate changes on the filter element:

Instantaneous pressure difference surge: Sudden flow rate changes will cause the inlet and outlet pressure difference of the pump outlet filter element Ap1E101-01D03V/Wf to increase sharply in milliseconds. If the pressure difference exceeds the yield limit of the filter element material, it may cause the filter material to wrinkle, break or even collapse as a whole.

Structural resonance risk: High-frequency flow fluctuations may stimulate the mechanical resonance of the filter element support structure and accelerate fatigue damage.

Decrease in filtration efficiency: Excessive pressure difference may force pollutants to penetrate the filter material or cause secondary release of captured particles.

3. Transient protection mechanism of filter element

The pump outlet filter element Ap1E101-01D03V/Wf achieves rapid response to sudden flow rate changes and pressure shock buffering through the following multi-layer protection design:

Gradient density filter layer: The filter element adopts a gradient filtration structure from sparse to dense. The outer coarse filtration layer can intercept large particle pollutants and disperse the pressure difference load, while the inner fine filtration layer ensures the final filtration accuracy. This design effectively reduces the risk of pressure difference concentration in single-layer filter material.

Enhanced support structure: The stainless steel skeleton adopts a composite design of corrugated plates and annular ribs, which increases the compressive strength by more than 30%. At the same time, the stress distribution is optimized through finite element analysis to avoid local stress concentration.

Intelligent monitoring and early warning system: A real-time differential pressure monitoring module is installed on the filter. When the differential pressure approaches the design threshold, the system triggers an audible and visual alarm to promptly remind the operator to reduce the speed of the main oil pump or switch to a standby filter.

4. Maintenance optimization suggestions

To ensure that the transient protection mechanism continues to be effective, it is recommended that users take the following measures for the main oil pump filter element Ap1E101-01D03V/Wf:

Pressure differential trend monitoring: Record the differential pressure data during operation. If the differential pressure rise rate is abnormal, it is necessary to promptly check the oil contamination or system flow fluctuation.

Preventive replacement strategy: Even if the filter element does not reach the differential pressure alarm threshold, it is recommended to replace it after 8,000 cumulative hours of operation to avoid hidden damage caused by material fatigue.

System collaborative optimization: Cooperate with the supplier of the steam turbine control system to optimize the speed control logic of the main oil pump and reduce the amplitude and frequency of flow step changes.

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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