Gear oil pump QX Series QX31-020/31-020/31-020R

2. Product Description

As a professional Chinese manufacturer and direct factory supplier of complete hydraulic solutions, Hengmeisi independently develops and produces the premium QX31-020/31-020/31-020R three-group tandem internal gear oil pump. Different from conventional single or dual pumps, this triple combined pump integrates three sets of independent QX31 pump units inside one compact housing. Each unit keeps 20cm³/rev standard displacement and clockwise rotation, supporting synchronous operation under rated working pressure. The whole pump maintains high volumetric efficiency and stable output during long-time running, with neat pipeline layout and simple installation. It is a practical high-performance component for multi-circuit hydraulic systems and complex industrial equipment.

3. Product Advantages

3.1 Three-group Combined Structure vs. Ordinary Single/Dual Pumps

Traditional single gear pump or dual tandem pump can hardly meet the simultaneous oil supply demand of multiple hydraulic loops. The QX31-020/31-020/31-020R three-stage internal gear oil pump applies integrated triple pump structure. Three independent pump units work synchronously without mutual interference, realizing separate flow output for different hydraulic branches. This design greatly simplifies the overall system layout, cuts down assembly space and effectively reduces the failure rate of split-type multi-pump combination.

3.2 Superior Material Matching for Long-Term Stable Operation

Integrated Pump Housing: Adopts high-rigidity nodular cast iron, one-piece precision processing, anti-deformation and pressure-resistant for long-time continuous operation.

Gear Pair: High-quality alloy steel with overall quenching treatment, surface hardness up to HRC58, outstanding wear resistance for cyclic working conditions.

Drive Shaft & Bearings: High-precision anti-fatigue bearings cooperate with reinforced drive shaft, stable rotation within full speed range.

Sealing Assembly: High-pressure resistant composite seals, adapting to -25℃ ~ +115℃ working environment, reliable anti-leakage performance for each pump unit.

3.3 Synchronous Output & Strong Anti-Interference Ability

Each pump unit of QX31-020/31-020/31-020R is equipped with independent pressure balance mechanism. The triple pump groups keep consistent flow and pressure output in operation. The optimized internal flow channel lowers fluid impact and turbulence, so the whole pump runs smoothly with low vibration. Even under complex working conditions with frequent start and stop, the three pump units still maintain stable performance, effectively avoiding flow fluctuation of each hydraulic branch.

4. Model Code Explanation

The model code QX31-020/31-020/31-020R follows unified industrial coding rules, which helps customers quickly confirm product configuration and core parameters:

QX: Standard internal gear oil pump series, featured with high efficiency, compact structure and reliable quality

31: High-efficiency medium-pressure series code, specially designed for multi-combined pump assembly and continuous industrial operation

020: Single pump unit rated displacement, 20 cm³/rev, uniform specification for three pump groups

/31-020/31-020: Three-group combined structure mark, three identical QX31-020 pump units integrated together

R: Rotation direction symbol, stands for clockwise rotation of the whole combined pump

5. Product Structure

Core Architecture: Triple Integrated Tandem StructureThe QX31-020/31-020/31-020R internal gear oil pump consists of three sets of independent internal & external gear pairs, shared integrated pump body, three groups of separate pressure balance plates and public drive assembly. Every single pump unit is an independent working module, while sharing one drive system to realize synchronous operation. The overall structure is compact and highly integrated.

Processing & Material FeaturesAll key parts are processed by high-precision CNC equipment to guarantee assembly accuracy. The thickened pump body enhances overall rigidity to bear comprehensive hydraulic load brought by three pump units. The gear sets adopt optimized conjugate tooth profile to reduce meshing friction and improve overall working efficiency of the combined pump.

Independent Protection DesignEach flow channel of the three pump units is designed separately. The flow guiding structure can block tiny impurities in hydraulic oil and protect internal gear pairs. Independent pressure balance structure ensures each pump unit works in the best state, and avoids mutual influence between different loops.

6. Application Scenarios

Multi-loop Automated Machinery: Multi-station automation equipment, combined fixture hydraulic systems

Special Industrial Hydraulic Stations: Multi-output integrated hydraulic power packs for factory assembly lines

Packaging & Printing Machinery: Large combined packaging equipment and multi-group pressing hydraulic systems

Light Industrial Processing Equipment: Textile machinery, leather processing equipment and supporting hydraulic components

General Industrial Combined Equipment: Multi-action hydraulic machinery requiring synchronous multi-path oil supply