Weigao BQ Pump Drive Transmission Box (BQ448/BQ452): Ultra-Heavy-Duty Triple Gear & Mag-Drive Seal Solution
I. Product Overview
Weigao BQ Pump Drive Transmission Box, featuring ultra-large flagship models BQ448 and BQ452, is a top-tier extreme-duty transmission device integrating helical-bevel-planetary triple compound structure and magnetic drive auxiliary sealing technology. Tailored for ultra-high pressure scenarios such as deep-sea 1000m+ transfer pumps, ultra-heavy-duty slurry pumps, and offshore oil drilling platform pumps, this pair overcomes the shortcomings of traditional super-large pump transmission boxes such as insufficient torque margin, seal failure under extreme pressure, and difficult temperature control. Compliant with GB/T 10095-2018 and API 677 ultra-high pressure standards, with IP68 permanent protection and IP69K optional enhancement, it features 42CrMoA forged alloy gears, integral forged steel housing, and magnetic-mechanical composite sealing system. Boasting advantages of ultra-high torque capacity, zero-leakage protection, intelligent temperature regulation, and ultra-long service life, it operates stably at -40℃ to +130℃, serving as a core power component for ultra-extreme industrial pump systems worldwide.
II. Core Advantages
1. Compound Gear Transmission, Pump-Specific Speed Matching
Adopting innovative helical-bevel-planetary triple compound transmission structure, the BQ448/BQ452 realizes efficient power transmission for ultra-high pressure heavy-duty pumps, achieving breakthroughs in torque density and stability. Gears are crafted from 42CrMoA forged alloy steel, undergoing deep carburizing quenching, precision grinding, and tooth top修缘+齿向鼓形 optimization, with tooth surface hardness up to HRC 64-68 and roughness ≤Ra 0.02μm. The helical gear stage ensures high efficiency (up to 98.2%), the arc bevel gear stage disperses multi-directional forces, and the planetary stage amplifies torque significantly. Models cover targeted ratios: BQ448 (300:1-450:1) for deep-sea medium-flow pumps; BQ452 (400:1-550:1) for ultra-high pressure large-flow pumps. Triple transmission efficiency reaches 91%-95%, torque density up to 28Nm/cm³, with enhanced self-locking function to prevent pump reverse rotation under ultra-high back pressure, ensuring absolute operational safety.
2. Model-Graded Design, Scenario-Specific Adaptation
The two models adopt ultra-heavy-duty differentiated design to match extreme scenario differences. BQ448 features integral forged steel housing with honeycomb rib layout, covering power 250kW-400kW and rated torque 60000Nm-85000Nm, tailored for 1000m deep-sea pump systems. BQ452 adopts reinforced forged steel housing with integral rib reinforcement, power 350kW-500kW and torque 80000Nm-110000Nm, suitable for offshore drilling platform ultra-high pressure injection pumps. Both models support flange-mounted rigid connection with precision alignment pins, controlling coaxiality error ≤0.008mm. The shaft extension adopts forged thickened structure with double keyway reinforcement, resisting high-torque impact during pump startup and adapting to long-term high-load operation without deformation.
3. Magnetic-Mechanical Composite Sealing, Ultra-Harsh Environment Adaptation
Targeting ultra-high pressure and deep-sea scenarios, the series adopts magnetic-mechanical composite sealing system to achieve zero-leakage operation. It integrates double-end mechanical seal, labyrinth structure, HNBR V-type combination seal rings and magnetic drive auxiliary seal, forming a quadruple protection barrier . The magnetic drive structure realizes non-contact torque transmission, eliminating dynamic seal gaps and fundamentally avoiding leakage risks . Standard IP68 protection resists 1000m deep-sea pressure, while IP69K optional enhancement withstands high-pressure water jet cleaning. The housing surface adopts nano-ceramic anti-corrosion coating, passing 3000-hour salt spray test. Optimized gear meshing and rigid housing reduce operating noise to ≤58dB (BQ448) and ≤61dB (BQ452) at 1m, ensuring stable operation at -40℃ to +130℃ under 60MPa working pressure .
4. Pump-Adapted Lubrication, Low Maintenance Cost
The lubrication system is equipped with intelligent恒温 control for ultra-heavy-duty continuous operation: BQ448 uses dual-circulation lubrication with plate-type oil cooler, while BQ452 adopts triple-circulation lubrication with independent refrigeration unit, controlling operating temperature below 65℃. All models use fully synthetic extreme pressure gear oil (ISO VG 320), equipped with online oil quality sensor, temperature monitor, automatic oil replenishment and purification system for real-time status monitoring. The first oil change is recommended after 800 hours of initial operation, and subsequent oil changes every 15000 hours under rated load. The modular structure with dedicated tooling allows quick replacement of seals and gears, reducing maintenance downtime by 55% and lowering operation costs.
III. Typical Application Fields
- Deep-Sea Exploration: 1000m+ deep-sea resource exploitation transfer pumps, BQ448 with IP68 protection and magnetic-mechanical sealing adapting to extreme deep-sea pressure
- Offshore Drilling: Ultra-high pressure well injection pumps, BQ452 with ultra-high torque and triple-circulation lubrication matching 24-hour continuous operation
- Mining Slurry: Ultra-heavy-duty high-concentration slurry pumps, BQ448 with reinforced housing and anti-cavitation design resisting abrasive fluid impact
- Petrochemical: Refinery ultra-high pressure hydrogenation pumps, BQ452 with zero-leakage sealing and corrosion-resistant coating adapting to toxic medium
- Water Conservancy: Ultra-large water injection pumps for cross-basin projects, BQ448 with stable transmission and intelligent temperature control ensuring long-term operation
IV. Key Technical Parameters
| Model | Transmission Ratio Range | Rated Torque | Lubrication Mode | Protection Grade |
| BQ448 | 300:1-450:1 | 60000Nm-85000Nm | Dual-Circulation Lubrication | IP68 (Optional IP69K) |
| BQ452 | 400:1-550:1 | 80000Nm-110000Nm | Triple-Circulation Lubrication | IP68 (Optional IP69K) |
V. Installation & Maintenance
Select models based on pump depth rating, pressure level, and flow demand (refer to the specification table). Use high-precision laser alignment tools to ensure coaxiality error ≤0.008mm during installation, fasten bolts with specified torque (300-450N·m for BQ448, 400-550N·m for BQ452) in diagonal sequence. Regularly monitor oil quality, temperature data and seal integrity, clean the oil cooler, filter and magnetic seal component monthly. Avoid overload operation exceeding 4 times rated torque, and use dedicated fully synthetic extreme pressure gear oil. Entrust maintenance to professional technicians with ultra-high pressure deep-sea pump transmission system experience.
Weigao BQ448/BQ452 Series Pump Drive Transmission Box adheres to the philosophy of "ultra-extreme adaptation, zero-leakage reliability, and intelligent durability". Its triple compound gear structure and magnetic-mechanical composite sealing design break through traditional super-large pump transmission boxes' torque and sealing limitations, ensuring reliable operation in ultra-extreme scenarios. Backed by strict quality control and professional after-sales service, it provides top-tier transmission solutions for deep-sea exploration, offshore drilling, and ultra-high pressure petrochemical industries, establishing itself as a trusted global partner in ultra-heavy-duty pump transmission.
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