ATOS gear pump PFG-160/D in stock

Brand

ATOS/Italian Atos

ATOS Gear Pump Structure and Principle:

The structure of the ATOS gear pump is very simple. Its most basic form consists of two identical gears meshing and rotating within a tightly fitted housing. The inside of this housing is shaped like an "8," housing the two gears, whose outer diameter and sides fit tightly into the housing. Material from the extruder enters between the two gears at the inlet and fills this space. As the gears rotate, it moves along the housing and is finally discharged when the two gears mesh. Technically, a gear pump is also called a positive displacement device, much like a piston in a cylinder. When one gear enters the fluid space of another gear, the liquid is mechanically squeezed out. Because liquid is incompressible, the liquid and the gears cannot occupy the same space at the same time, thus the liquid is expelled. Due to the continuous meshing of the gears, this phenomenon occurs continuously, thus providing a continuous discharge volume at the pump outlet. The amount discharged is the same for each revolution of the pump. 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. This is because the fluid is used to lubricate the bearings and gears, and the pump body cannot be perfectly flush, so a small amount of fluid loss is inevitable. However, the pump can still operate well, achieving 93%–98% efficiency for most extruded materials. For fluids whose viscosity or density varies during the process, this type of pump is not significantly affected. 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 it reaches the mechanical limit of the weakest component in the system (usually equipped with a torque limiter).

ATOS Gear Pump Gear Structure:

High-viscosity gear pumps commonly use spur gears, helical gears, herringbone gears, and spiral gears. The tooth profiles are mainly involute and circular arc shapes. Small gear pumps typically use involute spur gears, high-temperature gear pumps often use modified gears, and melt pumps conveying high-viscosity, high-pressure polymer melts often use involute helical gears. The gears and shafts are integrated, resulting in higher rigidity and reliability compared to gear pumps where the gears and shafts are manufactured separately. Low-pressure gear pumps from abroad often use a square structure for their gears, meaning the tooth width is equal to the tip circle diameter. However, high-viscosity gear pumps used in high-pressure applications have gear tooth widths smaller than their tip circle diameters. This is to reduce the radial pressure area of ​​the gears and lower the load on the gears and bearings.

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 the liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of two gears. The pressure at the discharge port of a gear pump depends on the magnitude of the resistance at the pump outlet. A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport or pressurize liquids. The structure of an external meshing double gear pump: A pair of meshing gears and the pump cylinder separate the suction chamber and the discharge chamber. When the gears rotate, the inter-tooth volume at the point where the gear teeth disengage on the suction side gradually increases, the pressure decreases, and the liquid enters the inter-tooth space under the pressure difference. As the gears rotate, the liquid between each tooth is carried to the discharge chamber. At this time, the inter-tooth volume at the point where the gear teeth mesh on the discharge side gradually decreases, and the liquid is discharged. ATOS gear pumps are suitable for transporting lubricating liquids that do not contain solid particles, are non-corrosive, and have a wide viscosity range. The pump's flow rate can reach 300 m³/h, and the pressure can reach 3 × 10⁷ Pa. It is commonly used as a hydraulic pump and for transporting various oils. Gear pumps are simple and compact in structure, easy to manufacture and maintain, and have self-priming capability. However, they experience significant flow and pressure pulsations and generate considerable noise. Gear pumps must be equipped with safety valves to prevent damage to the pump or prime mover due to factors such as blockage in the discharge pipe causing the outlet pressure to exceed the permissible value.

ATOS Gear Pump Performance Adjustment

ATOS Hydraulic Pumps, ATOS Piston Pumps, ATOS Gear Pumps

During use, the performance of ATOS gear pumps sometimes fails to meet production requirements, necessitating performance adjustment to meet actual needs. For example, during the dry season in winter or the flood season in summer, 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, resulting in reduced efficiency and uneconomical pump operation. Therefore, to ensure the pump meets new requirements while operating at higher efficiency, performance adjustment of the gear pump is necessary. There are generally two methods for adjusting the performance of screw pumps:

1. Speed ​​Adjustment: Axial flow pumps operate at a certain speed, achieving corresponding flow rate, head, power, and efficiency. Changing the speed alters these performance parameters, thus achieving adjustment. If the axial flow pump is powered by a diesel or gasoline engine, the throttle position can be adjusted to change the speed. If the axial flow pump is connected to the power unit via a V-belt or flat belt drive, the diameter of the drive pulley can be changed to change the speed. Replacing the drive or driven pulley can also alter the transmission ratio. Speed ​​adjustment is relatively economical and widely applicable, suitable for all agricultural water pumps.

2. Angle Adjustment: Structurally, axial flow pump impellers have large hubs, facilitating the installation of adjustable-angle blades. Changing the blade installation angle alters the lift force exerted by the blades on the water, thus changing the pump's performance. This is the angle adjustment method for axial flow pumps. As the blade installation angle increases or decreases, the flow rate, head, and power of the gear oil pump change accordingly. However, the highest point remains relatively unchanged, which is highly beneficial for the performance adjustment of axial flow pumps.

PFG-214

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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

Our company primarily deals in European and American brands, and can source brands from any European country. For example, our key German brands include: BURKERT, DEMAG, HAWE, REXROTH, HYDAC, PILZ relays, FESTO, IFM sensors, E+H, HEIDENHAIN, P+F sensors, SICK, TURCK, and HIRSCHMANN industrial switches. German brands: Hengstler, Murr, Schmersal, Samson, EPRO (Emerson Group)

American brands: MOOG, ASCO, MAC, NUMATICS, PARKER, VICKERS, ROSS

British brands: Norgren

Italian brands: OMAL, ATOS, CAMOZZI, UNIVER, Camozzi