Marine Cast Steel Ejector WaterEjector Propulsor

I. Product Overview

The marine cast steel Ejector waterEjector propulsor is an advanced power device designed for high-performance vessels, using ZG270-500 cast steel or ZG310-570 high-strength cast steel as the main material, and achieving efficient ship propulsion by integrating the ejector pump principle (Venturi effect). Its working principle is to use a centrifugal pump to suck water at high speed from the inlet, form a strong Ejector through the cast steel nozzle, and utilize reactive force to drive the ship forward, steer, and brake. After quenching-tempering treatment and surface anti-corrosion coating reinforcement, the cast steel material features excellent impact resistance and wear resistance, enabling stable operation in complex sea conditions and high-salinity seawater (Cl⁻ concentration ≤25,000ppm). It is suitable for high-end ship types such as high-speed vessels, luxury yachts, and offshore engineering ships, meeting strict IMO maritime regulations and international classification society certifications (LR, ABS, DNV, etc.).

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 200-5000m³/h, suitable for ships of 200-20,000 tons

Ejector speed: 20-40m/s, maximum thrust up to 1500kN

Propulsion efficiency: Hydrodynamic efficiency ≥82%, 20% higher than traditional propeller systems

Structural strength: Cast steel components pass ultrasonic testing (UT), capable of withstanding 3 times rated pressure impact

Corrosion resistance design: Surface with double-layer protection of epoxy zinc-rich primer + polyurethane topcoat (total thickness ≥350μm), passing 4000-hour salt spray test without rust

III. Technical Advantages and Innovative Design

1. High Performance and Extreme Condition Adaptability

Ultra-high-speed propulsion: ZG310-570 cast steel with optimized nozzles enables navigation at over 45 knots, meeting the 突袭 and pursuit needs of military vessels.

Impact-resistant structure: The integral cast steel shell adopts a streamlined thickened design, enhancing structural integrity by 60% in extreme environments like wave impact and ice collision.

2. Intelligent Control and Precision Maneuvering

Vector Ejector technology: Dual nozzles driven by servo motors rotate 360°, enabling complex maneuvers such as in-situ turning and lateral translation, with control accuracy of ±0.5°.

Integrated monitoring system: Built-in pressure, temperature, and vibration sensors monitor the propulsor status in real-time, with fault warning response time <5 seconds.

3. Long Life and Low Maintenance

Wear-resistant and anti-corrosion design: Cast steel impeller surface treated with tungsten carbide spraying, improving wear resistance by 3 times and extending service life to 20,000 hours.

Modular disassembly: Pump body, motor, and nozzles use quick-connect flanges, reducing single-component replacement time by 70% and significantly lowering downtime costs.

IV. Typical Application Scenarios

1. Military Vessel Field

Missile speedboats: ZG310-570 cast steel propulsors provide 40-knot high-speed power for speedboats, combined with vector Ejector for flexible evasion, enhancing battlefield survivability.

Amphibious assault ships: Multiple high-power propulsors in parallel, total flow exceeding 10,000m³/h, meeting the rapid deployment and recovery needs of landing craft.

2. Civil High-end Ships

Luxury yachts: Silent cast steel propulsors with operation noise ≤65dB, combined with variable frequency control, enabling dual-mode switching between energy-saving cruising and high-speed sprinting.

Marine research vessels: Anti-corrosion design adapts to polar high-salt and low-temperature environments, with precise vector control helping ships maintain stable positioning in ice zones.

3. Special Operation Vessels

Wind power maintenance ships: Propulsors equipped with automatic leveling systems maintain hull stability within ±3° in sea state 5, ensuring safety of high-altitude operations.

Fire rescue ships: Dual propulsors provide ≥800kN thrust, combined with water cannon systems, enabling rapid arrival and high-pressure fire-fighting linkage.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Ship purpose: Choose ZG310-570 for military/high-speed ships, ZG270-500 for civil conventional ship types

Speed requirement: >35 knots requires dual-nozzle vector propulsion system

Environmental conditions: Polar/high-corrosion sea areas need enhanced anti-corrosion coating (thickness ≥400μm)

2. Maintenance Key Points

Daily monitoring: Real-time monitoring of bearing temperature (temperature rise ≤35℃), vibration value (≤5.6mm/s), and seal pressure (leakage ≤5 drops/minute)

Regular maintenance: Check nozzle wear (allowable diameter loss ≤1mm) every 500 hours, inspect and replace gearbox oil annually

In-depth maintenance: Disassemble for ultrasonic testing every 3 years, reapply anti-corrosion coating, and calibrate the vector control system

VI. Compliance and Certification

International standards: Complies with IMO MSC.167(78) Code of Safety for WaterEjector Propelled Ships

Classification society certifications: Passed LR Rules for the Classification of Ships and ABS Guide for WaterEjector Propulsion Systems

Environmental requirements: Oil content in propulsion water ≤10ppm, meeting MARPOL Annex VI emission limits