Marine Copper Lubricating Oil Pump

I. Product Overview

Marine copper lubricating oil pumps are the "lubrication core" of ship power systems, designed specifically for lubricating oil circulation in equipment such as diesel engines, gearboxes, and turbochargers. Constructed with tin bronze (ZCuSn10Zn2) or leaded brass (HPb59-1) as the main material, they achieve precise delivery of high-viscosity lubricating oil through gear pump or screw pump principles. Their working principle involves a power source (electric motor or main engine transmission) driving gears/screws to mesh and rotate, generating pressure through volume changes in chambers to draw lubricating oil from the tank, pressurize it, and deliver it to equipment friction pairs (bearings, gears, etc.) after filtration. This forms an oil film to reduce wear, ensuring stable operation of equipment at 80-120℃. The pump body undergoes precision machining and surface hardening treatment, with a corrosion-resistant service life of ≥8 years in lubricating oil and high-temperature environments. It meets IMO Ship Machinery Lubrication System Specifications and lubrication equipment certification requirements of classification societies such as LR and ABS, widely used in key rotating equipment such as main engines, auxiliary engines, and propulsion systems.

II. Core Technologies and Material Characteristics

1.Copper Material Selection and Performance

2.Key Technical Parameters

Flow range: 1-50m³/h, suitable for equipment power 500-20,000kW (e.g., 10,000kW main engines require flow ≥10m³/h)

Pressure control: Outlet pressure 0.8-4.0MPa, pressure stability ≤±0.05MPa, ensuring uniform oil film thickness (5-20μm) on friction pairs

Medium compatibility: Capable of conveying mineral lubricating oil (viscosity 50-1000cSt), synthetic lubricating oil (e.g., PAO type), and hydraulic oil (viscosity index ≥140)

Temperature adaptability: Operates in a wide temperature range of -10℃~150℃, withstanding short-term overheating of lubricating oil (≤180℃) without material degradation

Metering accuracy: Volumetric efficiency ≥95% (at 300cSt viscosity), 5% higher than cast iron pumps, reducing lubricating oil delivery loss

3.Safety and Lubrication Design

Equipped with a pressure interlock device that automatically alarms and starts the backup pump when outlet pressure ≤0.6MPa to prevent dry friction of equipment

Surface roughness of flow-through components ≤Ra0.8μm, avoiding oxidative carbon deposition of lubricating oil (carbon residue ≤0.05%) and extending oil change intervals to 2000 hours

III. Technical Advantages and Innovative Design

1. High-Viscosity Oil Delivery Capacity

Dual-gear precision meshing: Adopts 0.01mm-level precision ground gears with meshing clearance ≤0.02mm, maintaining volumetric efficiency ≥92% at 1000cSt (100℃) — 15% higher than ordinary gear pumps — suitable for main engine crankcase lubrication.

Heated and insulated flow channel: Integrates an electric heating jacket (1-5kW) to heat low-temperature viscous lubricating oil (5000cSt at -10℃) to 40℃ (viscosity reduced to 300cSt), ensuring smooth oil supply during cold starts

2. Wear Resistance and Stability Enhancement

Bronze-alloy friction pair: Gear shafts use a tin bronze base with surface chrome plating (0.05mm thickness) to achieve hardness up to HV600, with a friction coefficient ≤0.001 against bearings, reducing wear by 60% compared to steel gears.

Pulsation compensation structure: An accumulator at the outlet reduces pressure pulsation from ±0.2MPa to ±0.03MPa, avoiding joint leakage caused by pipeline vibration.

3. Adaptation to Ship Power Characteristics

Wide speed ratio operation: The motor adopts frequency conversion design, with speed adjustable in the range of 500-3000r/min, and flow dynamically matching main engine load (e.g., flow reduces to 30% of rated value at idle), achieving 10% energy savings.

Shock-resistant installation: The pump unit and base use elastic supports, withstanding impact loads at ship heel ±15° and maintaining stable oil supply during main engine rapid acceleration (pressure fluctuation ≤±0.05MPa).

IV. Typical Application Scenarios

1. Lubrication of Main Engines and Large Equipment

Low-speed diesel engine lubrication: 15,000kW low-speed diesel engines are equipped with tin bronze lubricating oil pumps (flow 15-25m³/h, pressure 2.5MPa) to deliver 300cSt system oil to crankshaft and camshaft bearings, with stable outlet pressure at 2.5±0.05MPa, ensuring bearing temperature ≤75℃.

Gas turbine lubrication: High-pressure tin bronze gear pumps (flow 5-10m³/h) deliver 46-grade turbine oil to turbochargers at 3.0MPa, cooperating with precision filters (3μm accuracy) to control oil cleanliness ≤NAS 7.

2. Lubrication of Auxiliary Engines and Transmission Systems

Gearbox lubrication: Container ship reduction gearboxes use leaded brass lubricating oil pumps (flow 3-8m³/h, pressure 1.2MPa) to provide oil film lubrication for high-speed gear meshing surfaces, extending gear contact fatigue life to 10,000 hours.

Generator bearing lubrication: 1000kW diesel generators use micro tin bronze pumps (flow 1-3m³/h, pressure 0.8MPa) to precisely deliver lubricating oil to bearings at both ends, controlling oil temperature at 60±5℃ and reducing bearing vibration to ≤2.8mm/s.

3. Adaptation to Extreme Environments

Polar ship cold start: In -30℃ environments, tin bronze pumps with heating jackets start after 20 minutes of preheating (flow 5-15m³/h), raising lubricating oil temperature from -20℃ to 50℃ to ensure smooth diesel engine startup in extreme cold.

Tropical sea operation: In 45℃ high-temperature environments, leaded brass pumps control pump body temperature below 60℃ via built-in cooling jackets, avoiding lubricating oil oxidation due to overheating (acid value increase ≤0.1mgKOH/g/1000h) and adapting to full-load main engine operation.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Equipment type: Tin bronze pumps for main engines and high-viscosity oils; leaded brass pumps for auxiliary engines and low-viscosity oils

Flow calculation: Configure 1.5 times the total oil consumption of equipment friction pairs; e.g., a gearbox consuming 5L/h requires flow ≥7.5L/h (0.0075m³/h)

Viscosity range: Heated models for viscosity ≥500cSt; standard models for viscosity ≤300cSt; chemical-resistant models for oil with additives (e.g., extreme pressure agents)

2. Maintenance Points

Daily monitoring: Check outlet pressure (fluctuation ≤±0.1MPa), pump casing temperature (≤100℃), and lubricating oil cleanliness (NAS 8) every 500 hours

Regular maintenance: Replace suction filters (20μm accuracy) every 1000 hours; inspect gear wear (tooth thickness deviation ≤0.03mm) and replace mechanical seals (fluororubber material) every 2000 hours

In-depth maintenance: Disassemble and inspect every 4 years; re-chrome plate tin bronze components; replace gears when meshing clearance exceeds 0.05mm to ensure volumetric efficiency ≥90%

VI. Compliance and Certification

International standards: Complies with ISO 3448 lubricating oil pump performance standards and IMO MSC.389(94) requirements for ship machinery lubrication systems

Classification society certifications: Passed type approval by LR, ABS, and CCS (including 1000-hour high-temperature oil operation tests)

Material certification: Flow-through components meet ASTM B584 (tin bronze) and B149 (leaded brass) standards, ensuring compatibility with lubricating oil