AZPF AZPFF AZPG Hydraulic Double Gear Pump AZPFF-11-005/005RRR2020KB AZPFF-11-005/004LCB2020MB High Pressure

– Displacement and pressure parameters: The independent displacements of the dual pump cores are 5 cc/rev and 4 cc/rev respectively (model “005/004” corresponds to the displacements of the dual pump cores). The rated working pressure is 160 bar, the maximum allowable pressure is 200 bar (short-term ≤10 seconds), the back pressure of the double-circuit return oil is ≤3 bar, and the set pressure of the relief valve is 160 bar±5%

– Speed and flow parameters: Rated speed 3000 rpm, maximum speed 3600 rpm (short time ≤5 minutes), minimum stable speed 500 rpm; At the rated speed, the output flow rates of the dual pump cores are 15 L/min (5×3000÷1000) and 12 L/min (4×3000÷1000) respectively, with a total flow rate of 27 L/min and a flow pulsation rate of ≤3%

– Efficiency parameters: The volumetric efficiency of a single pump core under rated working conditions is ≥93%, and the total efficiency is ≥86%. The pressure loss of both circuits at the rated flow rate is ≤4 bar

2. Structure and connection parameters

– Structural type: Cast iron one-piece formed pump body, surface phosphating anti-rust treatment; Nitrided alloy steel gears (hardness HRC62-65), tin bronze pressure self-compensating distribution plates, double-end mechanical seal + oil-resistant lip seal combination; The two pump cores are arranged in parallel, sharing the input shaft, and have built-in independent oil channels to achieve independent oil supply in both circuits

– Installation and connection specifications: Flange installation (compatible with ISO 3019-1 standard, “LCB2020MB” corresponds to installation positioning); Oil port threads: Common oil suction port G3/4, dual independent oil outlet ports each G1/2, dual control oil port each G1/8; The output shaft is connected by a flat key (specification: 6×18). The overall weight is approximately 6 kg, and the external dimensions (length × width × height) ≈180×140×120 mm

– Protection grade: IP65, suitable for dusty and humid environments of small and medium-sized industrial equipment and light-load construction machinery

3. Medium and Environmental requirements

– Medium requirements: Compatible with L-HM 32/46 anti-wear hydraulic oil, allowable medium viscosity range 10-400 mm²/s, moisture content ≤0.02%, solid particle size ≤10 μm

– Environmental parameters: Operating environment temperature -25℃ to 90℃, relative humidity ≤95%; The cleanliness of the oil should reach ISO 4406 14/11 grade

– Filtration requirements: A filter screen of ≥80 mesh should be installed on the oil suction side. A filter with a filtration accuracy of ≤25 μm should be added to each of the two oil outlet return oil sides. It is recommended to add a fine filter screen (with an accuracy of ≤40 μm) on the oil suction side.

Ii. Working Principle

This pump is a double external meshing quantitative gear pump. Its core converts mechanical energy into hydraulic energy and provides stable oil supply through the mechanism of “double gear meshing volume change + double circuit independent pressure protection”. The specific process is as follows:

1. Core mechanism of power transformation

The motor drives the input shaft to synchronously rotate the driving gears inside the two pump cores, which in turn drives the driven gears of each pump core to mesh and rotate in opposite directions. In each pump core, the oil suction area where the gears disengage creates a local vacuum, and the hydraulic oil is drawn in through the common oil suction port and fills the gear tooth grooves of the two pump cores respectively. As the gears continue to rotate, the oil in the tooth grooves is carried to the pressure oil zone on the meshing side. The meshing of the gears compresses the volume of the tooth grooves, and the oil, after generating pressure, is guided through their respective distribution plates to the independent oil outlet for discharge, providing stable power for the dual-circuit actuating elements respectively.

2. Pressure protection mechanism

The integrated dual independent relief valves respectively correspond to the dual circuit pressure protection: when the pressure of a certain circuit rises to the rated value of 160 bar, the valve core of the corresponding relief valve opens, guiding the excess oil back to the oil suction chamber. When the pressure exceeds the maximum allowable value of 200 bar, the relief valve is fully open to unload, preventing the pump core and pipeline from being overloaded. The pressure self-compensating distribution plate automatically adheres to the end face of the gear under the action of high-pressure oil, compensates for the wear clearance, and ensures that the volumetric efficiency of the dual pump core remains stable at over 90% for a long time. The built-in check valve prevents the cross-flow of oil in the dual circuits and ensures the independence of the circuits.

Iii. Product Features and Advantages

– Dual independent fuel supply: The 5/4cc /rev dual displacement pump cores operate independently, capable of simultaneously providing a stable flow rate of 15/12L /min for dual actuating elements. The dual-loop flow accuracy is ±2%, suitable for dual-action coordinated or independent control scenarios, with a 60% increase in integration compared to two single pumps

– High efficiency and stable operation: Nitrided alloy steel gears in combination with tin bronze distribution plates, with tooth surface wear ≤ 0.1mm per 10,000 hours; The total efficiency of the dual pump cores is ≥86%, and the fault-free operating life under rated conditions is ≥ 12,000 hours, which is 30% longer than that of the ordinary dual pump of the same displacement

– Low noise and compact integration: The modified involute tooth profile design ensures that the gear meshing clearance is ≤ 0.03mm, and the operating noise at 1 meter is ≤ 75dB, which is 5 dB lower than that of the conventional double gear pump. The cast iron integrated pump body design reduces the volume by 40% compared to two independent single pumps, making it suitable for compact installation Spaces of small equipment

– Wide adaptability and strong protection: A wide temperature range of -25℃ to 90℃ is suitable for high and low temperature operations. With an IP65 protection rating, it can withstand dusty and humid environments. It supports two installation methods: flange and foot seat. The oil port can be rotated 360° for adjustment, adapting to different equipment layouts

Iv. Usage Functions and Purposes

1. Core usage functions

– Dual-loop quantitative oil supply: It provides two stable flow hydraulic oil channels for small and medium-sized dual-loop hydraulic systems, driving two independent or coordinated actuating elements to ensure the consistency of dual-action speeds

– Dual-circuit independent protection: Dual independent relief valves respectively control the maximum pressure of each circuit, replacing the external dual valve group and simplifying the system structure. The built-in check valve prevents cross-flow in the loop and enhances the safety of system operation

– Efficient power transmission: The dual pump cores share the input shaft, reducing power transmission loss by 15% compared to two single pumps. The total efficiency is ≥86%, and it can be matched with small motors ranging from 3 to 5.5 kW to achieve efficient conversion of mechanical energy

2. Main uses

As a core power component of medium and low pressure, medium and small flow dual-circuit hydraulic systems, it connects medium and small motors with dual actuating elements, providing stable power for dual-action control scenarios of various small industrial machinery and light-load construction machinery. It is an economically integrated core component of medium and small load dual-circuit transmission systems.

V. Applicable Machines and Scenarios

1. Adapt to the core machine

– Industrial machinery: 50-100 ton small injection molding machines, fully automatic labeling machines (with dual actions of label feeding and pressing), CNC lathe tool turret + tailstock system, small hydraulic baling machines

– Construction machinery: 2-3 ton micro forklifts (dual circuits for lifting and steering), small loaders (dual actions for lifting and flipping), micro excavators (auxiliary actions for boom and boom)

– Special equipment: Small double-station hydraulic lifting platforms, medical rehabilitation equipment (multi-joint drive), double-station press-fitting equipment for electronic components, auxiliary hydraulic systems for small ships

2. Typical application scenarios

– Small injection molding machine molding scenario: Equipped with an 80-ton small injection molding machine, with dual pump cores respectively driving the mold closing and ejection mechanisms; During the mold closing stage, the 5 cc/rev pump core provides a flow rate of 15 L/min to achieve rapid mold closing (time ≤1.5 seconds). During the ejection stage, the 4 cc/rev pump core provides a flow rate of 12 L/min to complete the ejection action. The pressure stability error of the dual channels is ≤1%

– Micro forklift operation scenario: As the power source for a 2-ton micro forklift, a 5 cc/rev pump core drives the lifting cylinder (lifting speed 0.5m /s, continuous lifting 50 times without pressure attenuation when carrying a load of 1.5 tons), and a 4 cc/rev pump core drives the steering cylinder (steering response time ≤0.3 seconds). IP65 protection is suitable for dusty environments in warehouses

– Dual-station press-fitting scenario: Compatible with dual-station press-fitting equipment for electronic components, the two press-fitting heads are driven by two pump cores respectively. The 15/12 L/min flow rate ensures a stable press-fitting speed of 40 mm/s, with a pressure control accuracy of ±2 bar and a press-fitting depth error of ≤0.05 mm, meeting the requirements of batch dual-station precision assembly

Six. Similar models

1. Different models of the same series displacement

-AZPFF -11-006/005LCB2020MB: Dual pump core displacement 6/5cc /rev, rated flow 18/15L /min, total flow 33L /min, rated pressure 160 bar, suitable for medium-sized dual-loop systems (such as 100-ton injection molding machines, 3-ton forklifts), weight approximately 7kg

-AZPF-11-004/003LCB2020MB: The dual-pump core has a displacement of 4/3 cc/rev, a rated flow rate of 12/9 L/min, a total flow rate of 21 L/min, and a rated pressure of 160 bar. It is suitable for ultra-small dual-loop systems (such as micro rehabilitation equipment and 50-ton presses), with a volume 15% smaller and a weight of approximately 5 kg

2. Models with the same displacement but different functions

-AZPF-11-005/004LCB2020MB-M: Manually adjustable relief valve model, suitable for dual-loop pressure fixed scenarios, with a simple structure and 18% lower cost

-AZPFF-11-005/004LCB2020MB-L: Left-rotating installation model, suitable for equipment with limited motor rotation direction. The dual oil outlet directions are reversed, and other performance is the same

-AZPFF-11-005/004FCB2020MB: Foot-mounted model, suitable for equipment with no flange installation space. The installation base plate complies with ISO 7005-1 standard, with a weight increase of 0.3kg