Weigao BQ Pump Drive Transmission Box (BQ3/BQ4 Series): Heavy-Duty Compound Gear & High-Pressure Adaptation Solution

I. Product Overview

Weigao BQ Pump Drive Transmission Box, covering large-size models BQ315, BQ320, BQ330, BQ335, BQ352, and BQ435, is a high-end heavy-duty transmission device integrating helical-bevel gear compound structure and high-pressure pump exclusive optimization. Tailored for extreme fluid transport scenarios such as high-pressure oil pumps, deep-sea transfer pumps, and heavy-duty sludge pumps, this series overcomes the shortcomings of traditional large pump transmission boxes such as insufficient load capacity, seal failure under high pressure, and poor temperature control. Compliant with GB/T 10095-2018 and API 677 high-pressure standards, with IP66/IP68 graded protection, it features 42CrMo alloy gears, integral cast steel housing, and triple-channel anti-leakage system. Boasting advantages of high-pressure resistance, stable heavy-load transmission, intelligent temperature control, and long service life, it operates stably at -30℃ to +120℃, serving as a core power component for extreme industrial pump systems worldwide.

II. Core Advantages

1. Compound Gear Transmission, Pump-Specific Speed Matching

Adopting helical-bevel gear compound transmission structure, the BQ3/BQ4 series realizes efficient power transmission for high-pressure heavy-duty pumps, balancing rigidity and stability. Gears are crafted from 42CrMo alloy steel, undergoing deep carburizing quenching and precision grinding, with tooth surface hardness up to HRC 62-66 and roughness ≤Ra 0.025μm. The helical gear stage ensures high efficiency (up to 97%) and low vibration, while the arc bevel gear stage disperses radial and axial forces evenly, avoiding shaft deformation under high pressure. Models cover targeted ratios: BQ315/BQ320 (50:1-150:1) for medium-high pressure centrifugal pumps; BQ330/BQ335/BQ352 (120:1-250:1) for ultra-high pressure screw pumps; BQ435 (200:1-350:1) for heavy-duty slurry pumps. Compound transmission efficiency reaches 90%-94%, torque density up to 22Nm/cm³, with self-locking function to prevent pump reverse rotation under high back pressure.

2. Model-Graded Design, Scenario-Specific Adaptation

The series adopts heavy-duty graded design to match extreme pump working conditions. BQ3 series models (BQ315/BQ320/BQ330/BQ335/BQ352) feature integral cast steel housing with reinforced rib layout, covering power 75kW-220kW and rated torque 15000Nm-45000Nm, suitable for land-based high-pressure pump systems. The flagship BQ435 model adopts forged steel housing for enhanced pressure resistance, power 160kW-315kW and torque 40000Nm-65000Nm, tailored for offshore and deep-sea pump applications. All models support flange-mounted rigid connection with pump shafts, equipped with precision alignment pins to control coaxiality error ≤0.01mm. The optimized shaft extension adopts thickened design with keyway reinforcement, adapting to high-torque impact during pump startup, enhancing integration reliability.

3. Dual-Channel Anti-Leakage, Complex Environment Adaptation

Targeting high-pressure fluid scenarios, the series adopts triple-channel anti-leakage and anti-cavitation design. Standard models adopt IP66 protection, combining double-end mechanical seal, labyrinth structure and HNBR V-type combination seal rings to resist high-pressure fluid infiltration. Enhanced models upgrade to IP68 with pressure-resistant fluorine rubber seals and oil return cavities, adapting to deep-sea, corrosive and high-pressure environments. The housing surface adopts ceramic anti-corrosion coating, passing 2000-hour salt spray test. Optimized gear meshing and rigid housing reduce operating noise to ≤57dB (BQ3 series) and ≤60dB (BQ435) at 1m. Anti-cavitation design on the input shaft prevents fluid impact damage, ensuring stable operation at -30℃ to +120℃ under 40MPa working pressure.

4. Pump-Adapted Lubrication, Low Maintenance Cost

The lubrication system is equipped with intelligent temperature control for heavy-duty continuous operation: BQ3 series uses forced circulation lubrication with plate-type oil cooler, while BQ435 adopts dual-circulation lubrication with independent cooling unit, controlling operating temperature below 70℃. All models use fully synthetic extreme pressure gear oil (ISO VG 220), equipped with online oil quality sensor, temperature monitor and automatic oil replenishment system for real-time status monitoring. The first oil change is recommended after 500 hours of initial operation, and subsequent oil changes every 12000 hours under rated load. The modular structure allows quick replacement of seals and gears, with dedicated tooling reducing maintenance downtime by 50%.

III. Typical Application Fields

• Offshore Oil & Gas: Deep-sea oil transfer pumps, BQ435 with IP68 protection and forged steel housing adapting to marine high-pressure environment
• Petrochemical Industry: High-pressure resin transfer pumps, BQ335/BQ352 with precise speed matching and anti-corrosion sealing
• Mining Slurry: Heavy-duty slurry pumps, BQ330 with high torque and anti-cavitation design resisting abrasive fluid impact
• Water Conservancy Project: Ultra-high pressure water injection pumps, BQ320 with stable transmission and intelligent temperature control
• Chemical Industry: High-viscosity chemical transfer pumps, BQ315 with helical-bevel compound structure ensuring smooth power output

IV. Key Technical Parameters

V. Installation & Maintenance

Select models based on pump pressure rating, rated torque, and working environment (refer to the specification table). Use precision alignment tools to ensure coaxiality error ≤0.01mm during installation, fasten bolts with specified torque (120-250N·m for BQ3 series, 200-350N·m for BQ435) in diagonal sequence. Regularly monitor oil quality, temperature data and seal integrity, clean the oil cooler and filter monthly. Avoid overload operation exceeding 3.5 times rated torque, and use dedicated extreme pressure gear oil. Entrust maintenance to professional technicians with high-pressure pump transmission system experience.

Weigao BQ3/BQ4 Series Pump Drive Transmission Box adheres to the philosophy of "heavy-duty reliability, high-pressure adaptation, and intelligent efficiency". Its helical-bevel compound structure and triple anti-leakage design break through traditional large pump transmission boxes' load and sealing limitations, ensuring reliable operation in extreme scenarios. Backed by strict quality control and professional after-sales service, it provides high-end transmission solutions for offshore oil & gas, petrochemical, and water conservancy industries, establishing itself as a trusted global partner in heavy-duty pump transmission.

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