Copper Ejector Cooling Pump

I. Product Overview

Marine copper ejector cooling pumps are high-efficiency heat exchange devices designed specifically for ship thermal systems, using tin bronze (CuSn10), aluminum bronze (CuAl9Fe4), or brass (CuZn20) as the main materials. Based on the ejector pump principle (Venturi effect), they enable forced circulation of seawater, fresh water, or coolant. The working principle is that high-pressure water forms a high-speed jet through a copper nozzle, creating vacuum negative pressure in the suction chamber to draw in the cooling medium, which is then pressurized by a diffuser and delivered to the heat exchange systems of main engines, generators, and other equipment. After solution treatment and passivation coating reinforcement, copper alloys exhibit a corrosion rate <0.02mm/year in seawater with Cl⁻≤20,000ppm, suitable for ship main engine cooling, air conditioning systems, and special equipment heat dissipation, 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: 60-400m³/h, suitable for 800-20,000-ton vessels

Head: 12-35m, self-priming height ≥7m, start-up response time ≤18s

Heat exchange efficiency: Ejector cooling efficiency ≥72%, 18% higher than traditional centrifugal pumps

Corrosion resistance design: Chromate passivation treatment, 3,000-hour salt spray test passed without rust, 2.5x improved seawater erosion resistance than cast iron

Temperature adaptability: Stable operation at -15℃~90℃

III. Technical Advantages and Innovative Design

1. High-Efficiency Heat Exchange and Anti-Scaling Capability

No electrochemical corrosion: Copper alloys form a cuprous oxide protective film when in contact with seawater, with corrosion resistance 1.8x higher than stainless steel in sulfate-containing cooling water, reducing heat exchanger scaling risks.

Turbulence enhancement design: Inner wall of diffuser with spiral guide grooves (pitch 150mm), combined with the antibacterial effect of copper ions, reducing biofilm attachment probability and improving heat transfer coefficient by 20%.

2. Extreme Condition Adaptability

Vibration-resistant structure: Integrated copper alloy casing dynamically balanced, vibration value ≤2.5mm/s, adapted to high-frequency vibration environments of ship main engines, reducing pipeline fatigue fracture risks.

High-temperature corrosion resistance treatment: Aluminum bronze components with supersonic sprayed ceramic layer (thickness 120μm), corrosion rate <0.015mm/year in 90℃ seawater, extending equipment life.

3. Low Maintenance and Cost Advantages

Modular quick-release: Pump body and pipelines use flange quick-connect design, reducing single-component replacement time by 65%, with maintenance costs 38% lower than stainless steel pumps.

Self-lubricating properties: Tin bronze impellers in cooling water with sediment content ≤200ppm have a wear rate only 1/3 of cast iron, reducing bearing replacement frequency.

IV. Typical Application Scenarios

1. Ship Power System Cooling

Diesel engine cooling: Tin bronze ejector pumps provide seawater cooling for coastal cargo ship main engines, flow 150-300m³/h, controlling cylinder liner temperature at 85-95℃ with plate heat exchangers.

Gas turbine heat dissipation: Aluminum bronze ejector pumps deliver fresh water to gas turbine lubrication systems, self-priming height 8m, controlling bearing temperature ≤75℃ to avoid overheating failures.

2. Special Ships and Equipment

LNG ship pump room cooling: Tin bronze resists low temperature (-15℃), delivering ethylene glycol solution to cool LNG pump units, flow 80-120m³/h, ensuring safety of low-temperature equipment.

Offshore engineering platforms: Aluminum bronze ejector pumps operate stably in sediment-laden seawater (≤300ppm), flow 200-400m³/h, supporting heat dissipation of deep-sea operation equipment.

3. Auxiliary System Heat Dissipation

Generator cooling: Brass ejector pumps provide fresh water cooling for ship auxiliary generators, flow 100-180m³/h, controlling winding temperature ≤110℃.

Hydraulic system heat dissipation: Linked with oil coolers to dissipate heat from deck machinery hydraulic systems, controlling oil temperature at 40-60℃ to extend hydraulic component life.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Water quality conditions: Choose brass for fresh water, tin bronze for seawater, aluminum bronze for sediment-laden seawater

Temperature requirements: Select aluminum bronze for >80℃, tin bronze or brass for ≤80℃

Flow matching: Configure at 1.3x maximum cooling medium demand, e.g., 10,000-ton cargo ships recommend flow 200-280m³/h

2. Maintenance Key Points

Daily monitoring: Inspect nozzle wear (allowable loss ≤0.6mm) and bearing temperature (≤70℃) every 500 hours

Regular maintenance: Clean suction strainers (accuracy ≤8mm) quarterly, remove heat exchange tube scale with 2% citric acid solution annually

In-depth maintenance: Ultrasonic testing every 3 years, reapplying passivation coating and replacing seals with wear exceeding 25%

VI. Compliance and Certification

International standards: Complies with IMO MSC.302(87) Code for Ventilation and Air Conditioning Systems in Machinery Spaces of Ships and ISO 8528 ship pump performance standards

Classification society certifications: Passed LR Rules for the Classification of Ships and ABS Rules for Building and Classing Ships

Environmental requirements: Copper ion emissions ≤0.1ppm, 100% recyclable material, compliant with MEPC.279(70) anti-pollution standards