Marine Copper Ejector Water Propulsion System

I. Product Overview

Marine copper Ejector water propulsion systems are marine power devices integrating traditional copper alloy technology with modern Ejector propulsion technology, using tin bronze (CuSn10), aluminum bronze (CuAl9Fe4), or brass (CuZn20) as the main materials. Based on the ejector pump principle (Venturi effect), they enable efficient vessel propulsion. The working principle is that a centrifugal pump pressurizes water from the suction port, forms a high-speed Ejector through a copper nozzle, and uses reactive force to drive the ship forward, while enabling steering and braking. After solution treatment and surface passivation, copper alloys exhibit a corrosion rate <0.02mm/year in seawater with Cl⁻≤20,000ppm, suitable for coastal yachts, inland vessels, and low-speed engineering ships, meeting IMO maritime regulations and classification society certifications (LR, ABS, etc.).

II. Core Technologies and Material Characteristics

1.Copper Alloy Material Selection and Performance

2.Key Technical Parameters

Flow range: 200-1,500m³/h, suitable for 100-5,000-ton vessels

Ejector velocity: 18-30m/s, maximum thrust up to 800kN

Propulsion efficiency: Hydrodynamic efficiency ≥75%, 15% more energy-efficient than traditional propellers

Corrosion resistance design: Chromate passivation treatment, 3,000-hour salt spray test passed without rust

Temperature adaptability: Stable operation at -20℃~80℃

III. Technical Advantages and Innovative Design

1. Balance of Corrosion Resistance and Wear Resistance

No electrochemical corrosion: Copper alloys form a cuprous oxide protective film when in contact with seawater, with corrosion resistance 2x higher than stainless steel in sulfide-containing seawater, suitable for inshore waters with multiple pollutants.

Self-lubricating property: The wear rate of tin bronze impellers in waters with sediment content ≤500ppm is only 1/3 of cast iron, reducing maintenance frequency.

2. Low Noise and Cavitation Resistance Design

Hydrodynamic optimization: Nozzles adopt parabolic contraction design (contraction ratio 1:4), reducing water cavitation noise to ≤75dB to meet yacht silence requirements.

Cavitation resistance coating: Aluminum bronze components with supersonic sprayed ceramic layer (thickness 100μm), extending cavitation erosion life to 40,000 hours.

3. Convenient Maintenance and Cost Advantages

Modular disassembly: Pump body and pipelines use flange quick-connect design, reducing single-component replacement time by 60%, with maintenance costs 35% lower than stainless steel propulsion systems.

Biofouling resistance: Copper ion release ≤0.1ppm, naturally inhibiting algae attachment, eliminating the need for additional antifouling coatings, compliant with MEPC.279(70) environmental requirements.

IV. Typical Application Scenarios

1. Recreational Vessel Sector

Luxury yachts: Tin bronze Ejector propulsion provides silent power (noise ≤65dB) for 60m-class yachts, flow 500-800m³/h, supporting 18-25 knot cruising.

Sightseeing cruise ships: Brass propulsion adapts to inland fresh water, flow 300-600m³/h, stable operation in waters with sediment content ≤300ppm.

2. Engineering and Official Vessels

Dredgers: Aluminum bronze propulsion passes ≤3mm sediment particles, flow 1,000-1,500m³/h, outstanding wear resistance in dredging operations.

Port tugs: Brass propulsion with vector Ejector technology enables 360° steering, towing force up to 500kN, adapting to complex port operations.

3. Special Vessel Applications

Polar research ships: Aluminum bronze propulsion maintains good toughness in -20℃ seawater, with electric tracing system, supporting low-speed navigation (≤10 knots) in ice zones.

Fishing vessels: Tin bronze resists seawater corrosion, with service life 2x longer than cast iron propulsion in high-salinity (>3.8%) fishing grounds.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Water quality conditions: Choose brass for fresh water, tin bronze for seawater, aluminum bronze for high-flow/sediment waters

Speed requirement: Select aluminum bronze for >25 knots, tin bronze or brass for ≤25 knots

Ship tonnage: Choose brass for <1,000 tons, bronze alloys for ≥1,000 tons

2. Maintenance Key Points

Daily monitoring: Inspect nozzle wear (allowable loss ≤0.8mm) and bearing temperature (≤70℃) every 500 hours

Regular maintenance: Remove impeller scale with 5% citric acid solution annually, reapplying passivation layer

In-depth maintenance: Ultrasonic testing every 3 years, replacing components with wear exceeding 20%

VI. Compliance and Certification

International standards: Complies with IMO MSC.167(78) Code for the Safe Operation of Water Ejector Propelled Ships

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

Environmental requirements: Copper ion emissions comply with MEPC.279(70) anti-pollution standards, 100% recyclable material