German ATOS pump ATOS model ATOS price

ATOS pumps are also known as positive displacement devices. Like a piston in a cylinder, when one gear tooth enters the fluid space of another, the liquid and the tooth cannot occupy the same space simultaneously because the liquid is incompressible. Thus, the liquid is mechanically squeezed out. Due to the continuous meshing of the gears, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed.

ATOS pump drive unit

The gear pump is driven by an independent motor, which can effectively block upstream pressure pulsations and flow fluctuations. The pressure pulsation at the gear pump outlet can be controlled within 1%. Using a gear pump on an extrusion production line can increase the flow output speed and reduce shear and residence time of materials in the extruder. External gear pumps are the most widely used type of gear pump; generally, the term "gear pump" refers to external gear pumps. Its structure is shown in Figure 5-14, mainly consisting of a driving gear, driven gear, pump body, pump cover, and safety valve. The sealed space formed by the pump body, pump cover, and gears constitutes the working chamber of the gear pump. The shafts of the two gears are mounted in bearing holes on the two pump covers respectively. The driving gear shaft extends out of the pump body and is rotated by the motor. External gear pumps feature simple structure, light weight, low cost, reliable operation, and wide application range. During operation, the driving gear rotates with the motor and drives the driven gear to rotate. When the meshing teeth on the suction side gradually separate, the volume of the suction chamber increases, pressure decreases, and liquid from the suction pipe is drawn into the pump. The sucked liquid is pushed by the gears in the tooth grooves along two paths into the discharge chamber. After entering the discharge chamber, the liquid is squeezed by the continuous meshing of the two gears and enters the discharge pipe. As the driving and driven gears rotate continuously, the pump continuously sucks in and discharges liquid. A safety valve is installed on the pump body. When the discharge pressure exceeds the specified pressure, the conveyed liquid automatically opens the safety valve, allowing high-pressure liquid to return to the suction pipe. Internal gear pumps consist of a pair of mutually meshing internal gears, a crescent-shaped piece between them, and a pump housing. The crescent-shaped piece separates the suction chamber from the discharge chamber. When the driving gear rotates, a partial vacuum is formed where the gears disengage, drawing liquid into the pump to fill the spaces between the teeth in the suction chamber. The liquid then enters the discharge chamber along the inner and outer sides of the crescent-shaped piece via two paths. Where the teeth engage, the liquid between the teeth is squeezed into the discharge pipe. In addition to self-priming capability and flow rate independent of discharge pressure, gear pumps have no suction or discharge valves on the pump housing, offering simple structure, uniform flow, and reliable operation. However, they have low efficiency, high noise and vibration, and are prone to wear. They are mainly used to convey various non-corrosive, solid-free oils with lubricating properties, such as lubricating oil and edible vegetable oil. The temperature generally does not exceed 70 ℃. The general flow range is 0.045～30ms/h, pressure range is 0.7—20MPa, and operating speed is 1200—4000r/min.

ATOS pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. As a new type of high-efficiency pump with high technical content, radial piston pumps will inevitably become an important part of the piston pump application field as domestic production accelerates. A radial piston pump is a piston pump where the reciprocating motion direction of the pistons or plungers is perpendicular to the drive shaft. Radial piston pump working principle: Drive torque is transmitted from the drive shaft to the star-shaped hydraulic cylinder rotor via a cross coupling. The stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. Radially arranged pistons located in the rotor press against the eccentric stroke stator via hydrostatically balanced slippers. The pistons are connected to the slippers by ball joints and locked by snap rings. Two retaining rings hold the slippers against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor turns, due to the eccentricity of the stator, the pistons perform reciprocating motion. Their stroke is 3 times the stator eccentricity. The stator eccentricity can be adjusted by two pistons located radially opposite each other on the pump body. Oil inlet and outlet occur through channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. Hydraulic pressure generated in the pump body is absorbed by hydrostatically balanced surfaces. The hydrostatic balance of friction pairs adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only provide support and are not subjected to other external forces. In hydraulic systems: Axial piston pumps operate by utilizing volume changes produced by the reciprocating motion of pistons parallel to the transmission shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, high-precision fits can be achieved during machining.

ATOS pump features and maintenance

Advantages: Simple and compact structure, small size, light weight, good manufacturability, low price, strong self-priming ability, insensitivity to oil contamination, wide speed range, ability to withstand shock loads, easy maintenance, and reliable operation. Disadvantages: Unbalanced radial forces, large flow pulsation, high noise, low efficiency, poor interchangeability of parts, difficult repair after wear, and inability to function as variable displacement pumps. 1) Oil trapping phenomenon. Cause: During the operation of involute gear pumps, the closed volume at the gear intersection changes with time. Often, a portion of hydraulic oil is sealed between the teeth, as shown in the figure, known as the oil trapping phenomenon. Since hydraulic oil is incompressible, this causes significant vibration and noise in the external gears, affecting normal system operation. Measure: Cut relief grooves on the front and rear covers or floating bushings. Principles for cutting relief grooves: The distance between the two grooves corresponds to the minimum closed volume. The closed volume connects to the pressure oil chamber when decreasing from large to small, and connects to the suction oil chamber when increasing from small to large. 2) Leakage phenomenon. Gear pumps have significant leakage. For external gear pumps, leakage paths during operation include three points: first, the gear tip clearance; second, the side clearance; third, the meshing clearance. Among these, end-face side clearance leakage is significant, accounting for 80%-85% of the total leakage. When pressure increases, the former does not change, but the deflection of the latter increases significantly. This is the main reason for leakage in external gear pumps. Due to lower volumetric efficiency, they are not suitable for use as high-pressure pumps. Solution: End-face clearance compensation adopts hydrostatic balance measures, adding a compensation part between the gear and the cover, such as a floating bushing or floating side plate. 3) Unbalanced force phenomenon. The right side is the pressure oil chamber, and the left side is the suction oil chamber; the pressures in the two chambers are unbalanced. Additionally, due to tip leakage in the pressure oil chamber, its pressure decreases progressively. These two unbalanced pressures acting on the gears and shaft are called radial unbalanced pressures. The higher the oil pressure, the greater this force, accelerating bearing wear, reducing bearing life, causing shaft bending, and increasing wear between the gear tips and shaft holes. Prevention measures: Use pressure balance grooves or reduce the size of the pressure oil chamber.

Weidou Intelligent Technology specializes in selling German ATOS gear pumps, ATOS gear pumps, ATOS diaphragm pumps, ATOS centrifugal pumps, ATOS piston pumps, ATOS vacuum pumps, ATOS screw pumps, ATOS submersible pumps, ATOS peristaltic pumps, ATOS lubrication pumps, ATOS vane pumps, ATOS metering pumps, ATOS hand pumps, ATOS drum pumps, ATOS lobe pumps, ATOS booster pumps, ATOS liquid pumps, ATOS air pumps. Original imports from Germany. Welcome customers to inquire and order.