ATOS gear pump PFGXF-114/D in stock

Brand

ATOS/Italian Atos

ATOS Gear Pump, ATOS Axial Piston Pump, ATOS Vane Pump, ATOS Cylinder, ATOS Relief Valve, ATOS Proportional Valve

"ATOS gear pump oil leakage" refers to hydraulic oil puncturing the skeleton oil seal and overflowing. This phenomenon is widespread, and OEMs have expressed strong concerns. Gear pump oil leakage seriously affects the normal operation of loaders, the reliability of gear pumps, and environmental pollution. To facilitate the solution of this problem, the causes and control methods of gear pump oil seal leakage failure are analyzed. 1. Impact of component manufacturing quality

(1) Oil seal quality.

For example, if the geometry of the oil seal lip is unqualified, or the tightening spring is too loose, it will cause air leakage during the airtightness test, resulting in oil leakage after the gear pump is installed in the OEM. In this case, the oil seal should be replaced and the material and geometry inspected (the quality difference between domestic oil seals and other oil seals is significant).

(2) Gear pump processing and assembly. If there are problems with the machining or assembly of the gear pump, causing the gear shaft rotation center to be misaligned with the front cover stop, it will result in uneven wear of the oil seal. In this case, the symmetry and displacement of the front cover bearing hole relative to the pin hole, and the coaxiality of the skeleton oil seal relative to the bearing hole should be checked.

(3) Sealing ring material and machining quality.

If this problem exists, causing cracks and scratches on the sealing ring, it will result in poor secondary sealing or even failure, allowing pressurized oil to enter the skeleton oil seal (low-pressure channel), thus causing oil leakage from the oil seal. In this case, the sealing ring material and machining quality should be checked.

(4) Machining quality of the variable speed pump.

Feedback from the OEM indicates a significant oil leakage problem in the gear pump oil seal, which is assembled with the transmission pump. Therefore, the machining quality of the transmission pump has a substantial impact on oil leakage. The transmission pump is mounted on the gearbox output shaft, and the gear pump is positioned on the gearbox output shaft via the transmission pump stop. If the runout (perpendicularity) of the transmission pump stop end face to the gear rotation center exceeds the tolerance, it will cause the gear shaft rotation center to misalign with the oil seal center, affecting the seal. During the machining and trial production of the transmission pump, the coaxiality of the rotation center with respect to the stop and the runout of the stop end face should be checked.

(5) A blocked oil return channel in the front cover between the CBG gear pump skeleton oil seal and the sealing ring causes increased pressure at this point, potentially puncturing the skeleton oil seal. Improvements to this area have significantly reduced the oil leakage problem in the pump. During operation, ATOS gear pumps sometimes fail to meet production requirements, necessitating performance adjustments to adapt to actual needs. For example, during winter's low water levels or summer's flood season, changes in the water level of the inlet or outlet pool alter the actual terrain and pumping height. The originally determined head and flow rate become unsuitable, leading to reduced efficiency and uneconomical pump operation. Therefore, to ensure the pump meets new requirements while maintaining high efficiency, performance adjustments to the gear pump are necessary.

The ATOS gear pump is a type of positive displacement pump, consisting of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction and discharge chambers are separated by the meshing line of the two gears. The pressure at the pump outlet depends on the resistance at the pump outlet.

ATOS Gear Pump Structure and Principle

The structure of the ATOS gear pump is very simple; its most basic form consists of two gears of similar size… Two gears mesh and rotate within a tightly fitted housing, shaped like the number "8". The gears' outer diameter and sides fit snugly into the housing. Material from the extruder enters between the two gears at the inlet, filling the space. As the gears rotate, the material moves along the housing and is finally discharged when the two gears mesh. Technically, a gear pump is also called a positive displacement pump, much like a piston in a cylinder. When one gear enters the fluid space of another, the liquid is mechanically squeezed out. Because liquid is incompressible, the liquid and the gears cannot occupy the same space simultaneously, thus expelling the liquid. This phenomenon occurs continuously due to the constant meshing of the gears, providing a continuous discharge at the pump outlet; the discharge rate is the same per revolution. With the continuous rotation of the drive shaft, the pump continuously discharges fluid. The pump's flow rate is directly related to its rotational speed. In reality, there is a small amount of fluid loss within the pump, preventing it from reaching 100% efficiency, as this fluid is used to lubricate the bearings. Because the pump body and gears are designed with a clearance-free fit, 100% fluid cannot be discharged from the outlet, so a small amount of fluid loss is inevitable. However, the pump can still operate well, achieving 93%–98% efficiency for most extruded materials. This type of pump is not significantly affected by fluids whose viscosity or density varies during the process. If a damper is present, such as a filter or restrictor on the outlet side, the pump will force the fluid through them. If this damper changes during operation—for example, if the filter becomes dirty or clogged, or the back pressure of the restrictor increases—the pump will still maintain a constant flow rate until the mechanical limit of the weakest component in the system is reached (usually equipped with a torque limiter).

PFG-114

PFG-120

PFG-128

PFG-135

PFG-142

PFG-160

PFG-174

PFG-187

PFG-199

PFG-211

PFG-214

PFG-216

PFG-218

PFG-221

PFG-327

PFG-340

PFG-354

PFG-210

PFG-114/D

PFG-120/D

PFG-128/D

PFG-142/D

PFG-160/D

PFG-174/D

PFG-187/D

PFG-199/D

PFG-210/D

PFG-211/D PFGXF-114/D

PFGXF-120/D

PFGXF-128/D

PFGXF-142/D

PFGXF-160/D

PFGXF-174/D

PFGXF-187/D

PFGXF-199/D

PFGXF-210/D The company primarily deals in European and American brands, and can source brands from any European country. For example, its key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, HIRSCHMANN industrial switches, Henschler, MURR, SCHMERSAL, SAMSON, and EPRO (a subsidiary of Emerson). Other brands include: MOOG (USA), ASCO (USA), MAC (USA), NUMATICS (USA), PARKER (USA), VICKERS (USA), and Helon Norgren (UK). Italian brands OMAL, ATOS, CAMOZZI, UNIVER, and Camozzi.