Marine Copper Gear Lubricating Oil Pump

I. Product Overview

The marine copper gear lubricating oil pump is a core key equipment of the ship's power lubrication system. It is specially designed for the lubricating oil transportation and circulation conditions of key power components such as ship main engines, auxiliary engines, gearboxes, and stern tubes. Its core working principle is to form a closed cavity through the meshing rotation of a pair of precision copper gears, realizing the suction, pressure boosting and stable transportation of lubricating oil. Relying on the excellent corrosion resistance, wear resistance and good thermal conductivity of copper alloy materials, it can accurately match the transportation needs of ship lubricating oils (diesel engine oil, heavy oil, gear oil, etc.), ensuring that power components continuously obtain sufficient and clean lubrication, effectively reducing component wear, improving heat dissipation efficiency, and building a "lubrication line of defense" for the safe and stable operation of the ship's power system.

The core components of the equipment (copper gears, pump body, end cover, transmission shaft) are all precision-machined from high-quality copper alloys (tin bronze, brass), matched with oil-resistant and high-temperature-resistant sealing components and reinforced bearings. It has core characteristics such as compact structure, seawater corrosion resistance, salt spray erosion resistance, wear resistance and non-magnetism, stable operation without pulsation, and high transportation efficiency. It can easily adapt to complex working conditions such as high humidity, strong salt spray, severe vibration, large temperature difference fluctuations and lubricating oil containing a small amount of impurities faced by ocean-going, coastal and inland river ships. As the "power heart" of the ship's power lubrication system, the product strictly complies with international and domestic standards such as the International Convention for the Safety of Life at Sea (SOLAS), IMO Marine Machinery Equipment Rules, GB/T 10832-2011 *Marine Pumps*, and GB/T 34524-2017 *Technical Conditions for Gear Pumps*. It has obtained certifications from mainstream classification societies such as China Classification Society (CCS) and American Bureau of Shipping (ABS), and is widely used in various ships including 500-200000 ton ocean-going cargo ships, oil tankers, container ships, bulk carriers, ro-ro passenger ships, inland river cargo ships and offshore operation platforms. Compared with cast iron and stainless steel gear lubricating oil pumps, copper alloy materials have more excellent seawater corrosion resistance and anti-seizure performance, especially suitable for the humid and salt spray environment of ships and the long-term circulation and transportation conditions of lubricating oil. It is the preferred equipment for the lubrication system of medium and high-end ships and special ships.

II. Core Technical Parameters

Pressure Range: Rated working pressure 0.2-1.2 MPa, maximum working pressure up to 1.6 MPa, pressure fluctuation error ≤ ±1.0%. It can meet different pressure requirements such as lubricating oil circulation of ship main engine/auxiliary engine, pressure oil supply of gearbox, and lubrication of stern tube, ensuring stable and controllable lubrication pressure.

Flow Range: 5-150 m³/h, which can be customized in grades according to ship tonnage (500-200000 tons), power component model (main engine power, gearbox specification) and lubricating oil demand. The flow stability error under rated working conditions is ≤ ±1.5%, adapting to the needs of lubrication systems of ships of different scales.

Medium Adaptability: Designed specifically for lubricating oil transportation, it can stably transport various commonly used ship lubricating oils such as diesel engine oil, heavy oil, gear oil and turbine oil; suitable for medium viscosity range 5-1500 mm²/s, impurity content ≤ 0.3% (particle size ≤ 1mm); applicable medium temperature range -20℃ to 120℃, which can cope with lubricating oil transportation needs during navigation in polar low-temperature sea areas and high-temperature working conditions.

Material Parameters: The pump body is precision-machined from brass; the transmission shaft is made of steel (enhanced corrosion resistance); the seal adopts oil-resistant fluororubber (FKM) + polytetrafluoroethylene (PTFE) composite structure, with excellent oil-resistant and high-temperature-resistant performance, and leakage ≤ 0.01 mL/h, ensuring no leakage and no pollution in lubricating oil transportation.

Drive Mode: Mainly adopts special marine asynchronous motor drive (protection class IP55, insulation class F), with optional diesel engine drive mode; the motor supports 220V/380V/440V marine standard voltage, and the drive system has overload, overheating, phase loss and pressure abnormality protection functions, which can be linked with the ship's central control system (PLC) to realize automatic start-stop and flow regulation.

Operating Performance: Volumetric efficiency ≥ 93%, total efficiency ≥ 88%; Net Positive Suction Head (NPSH) ≤ 3.2 m, self-priming height ≥ 2.0 m, self-priming time ≤ 30 seconds (at 1.5m suction lift); operating noise ≤ 70 dB(A), vibration acceleration ≤ 0.9 m/s²; continuous operation life ≥ 10000 hours, supporting 24-hour continuous lubricating oil supply operations, adapting to the uninterrupted operation needs of the ship's power system.

III. Structural Design and Core Advantages

3.1 Core Structural Design

Precision Copper Gear Meshing Structure: Adopts high-precision involute copper gear design. The gears are precision ground, with tooth surface hardness ≥ HB220, and meshing clearance controlled at 0.01-0.025 mm, forming a closed and efficient transportation cavity to realize stable and pulsation-free transportation of lubricating oil, avoiding the impact of pressure fluctuations on lubrication effect; the tooth profile of copper gears is optimized through fluid mechanics to reduce lubricating oil transportation resistance, improve transportation efficiency, and reduce energy loss.

Copper Alloy Integral Molding Pump Body: The pump body adopts copper alloy integral casting process, without splicing welds, with compact and solid structure and tensile strength ≥ 350 MPa, which can withstand the bumpy impact during ship navigation and pressure fluctuation during lubricating oil transportation; the flow channel in the pump body is polished to reduce lubricating oil residue and flow resistance, while improving the wear resistance of the pump body and extending the service life of the equipment.

Oil-Resistant Enhanced Sealing System: Adopts "mechanical seal + oil seal" double sealing structure. The sealing surface is made of silicon carbide-graphite composite material. The seal lip structure is optimized according to the viscosity characteristics of lubricating oil, effectively preventing lubricating oil leakage and external seawater and impurity intrusion; equipped with a seal cavity cooling device to reduce the working temperature of the seal assembly, avoid seal failure caused by high-temperature lubricating oil, and ensure the reliability and service life of the seal.

3.2 Core Technical Advantages

Excellent Corrosion Resistance and Wear Resistance, Adapting to Marine Working Conditions: Copper alloy materials have excellent seawater corrosion resistance and salt spray erosion resistance. After precision processing and surface treatment, they can effectively resist the erosion of high humidity and strong salt spray environment of ships, and are not easy to rust and scale; copper gears have good wear resistance and anti-seizure performance. Even if the lubricating oil contains a small amount of impurities, it can operate stably. Compared with cast iron gear pumps, the service life is extended by more than 60%, which is suitable for the harsh lubrication needs of long-term ocean-going navigation of ships.

Stable Operation Without Pulsation, Precise and Efficient Lubrication: The precision copper gear meshing structure operates stably without pulsation, and can stably output lubricating oil with constant pressure and flow, ensuring uniform oil supply at each lubrication point of power components such as ship main engine and auxiliary engine, avoiding local wear or overheating of components caused by uneven oil supply; high volumetric efficiency ensures efficient lubricating oil transportation, provides sufficient lubrication for power components, and improves the operational stability of the power system.

Non-Magnetic Characteristic, Adapting to Special Ships: Copper alloy materials are non-magnetic, and can be adapted to the lubrication system of special ships (such as military ships, scientific research ships) that need to avoid magnetic interference. They will not cause magnetic field interference to ship navigation and detection equipment, ensuring the normal work of special ship equipment; at the same time, the non-magnetic characteristic also prevents gears from adsorbing ferromagnetic impurities, reducing the risk of lubrication system blockage.

IV. Typical Application Scenarios

4.1 Lubricating Oil Circulation of Ship Main Engine/Auxiliary Engine

The ship's main engine and auxiliary engine are the core of the ship's power. Their rotating components need continuous and sufficient lubricating oil lubrication to reduce wear. Relying on the stable and pulsation-free transportation characteristics, the marine copper gear lubricating oil pump can accurately transport lubricating oil to key components such as the crankshaft, connecting rod and camshaft of the main engine and auxiliary engine, ensuring uniform oil supply at each lubrication point; the copper material is corrosion-resistant and wear-resistant, and can be long-term adapted to the lubricating oil circulation working conditions, avoiding lubrication interruption caused by pump body failure; linked with the PLC system, it can real-time monitor the oil supply pressure and flow, ensuring the safe and stable operation of the main engine and auxiliary engine.

4.2 Lubricating Oil Supply of Ship Gearbox

The ship gearbox undertakes the functions of power transmission and speed change. The internal gear meshing requires high-pressure and stable lubricating oil supply. The rated working pressure of the marine copper gear lubricating oil pump can accurately match the lubrication needs of the gearbox. The high-pressure and stable oil supply can form an effective oil film on the gear surface, reducing meshing wear; the copper gear has strong anti-seizure performance, and can be adapted to the working conditions where the gearbox lubricating oil contains a small amount of metal debris, avoiding gear jamming; the oil-resistant seal design prevents lubricating oil leakage, ensuring the normal work of the gearbox.

4.3 Lubrication System of Ship Stern Tube

The stern tube is a key component of the ship's propulsion system, which is long-term immersed in seawater, and has extremely high requirements on the corrosion resistance of lubrication equipment. The marine copper gear lubricating oil pump adopts copper alloy material resistant to seawater corrosion, which can effectively resist the erosion of high salt spray and high humidity environment around the stern tube; stable oil supply can ensure the formation of a lubricating film between the stern shaft and the bushing, reducing friction and wear, and preventing seawater from invading the inside of the stern tube, extending the service life of the stern tube.

4.4 Ship Emergency Lubrication Guarantee

In emergency situations (such as main power failure), the power components still need temporary lubrication to avoid component damage. The marine copper gear lubricating oil pump can be equipped with a diesel engine drive mode, which can start quickly when the main power is interrupted, providing emergency lubricating oil supply for key power components; the strong self-priming capacity can quickly suck lubricating oil, ensuring uninterrupted emergency lubrication; stable and reliable operation buys time for ship emergency disposal.

4.5 Lubrication System of Special Ships (Military/Scientific Research)

Military ships and scientific research ships have extremely high requirements for non-magnetism of equipment to avoid magnetic field interference with navigation and detection equipment. The marine copper gear lubricating oil pump adopts non-magnetic copper alloy material, which will not generate magnetic field interference, perfectly adapting to the needs of the lubrication system of special ships; at the same time, it has excellent corrosion resistance and wear resistance, and can be adapted to the complex navigation environment of special ships, ensuring the synchronous and stable operation of the power system and special equipment.