ATOS vane pump PFE-51090-10T-A available now.

Brand

ATOS/Italian Atos

ATOS Vane Pump Working Principle

The ATOS vane pump consists of a rotor 1, stator 2, vanes 3, distribution plate, and end caps. The inner surface of the stator has cylindrical holes. There is an eccentricity between the rotor and the stator. The vanes can slide flexibly in the rotor slots. Under the centrifugal force of the rotor rotation and the pressure of the oil flowing into the root of the vanes, the top of the vanes adheres tightly to the inner surface of the stator, thus forming sealed working chambers between two adjacent vanes, the distribution plate, the stator, and the rotor. When the rotor rotates counterclockwise, the vanes on the right side of the diagram extend outward, and the volume of the sealed working chamber gradually increases, creating a vacuum. Oil is then drawn in through the suction port 6 and the window on the distribution plate 5. On the left side of the diagram, the vanes retract inward, and the volume of the sealed chamber gradually decreases. The oil in the sealed chamber is forced out through another window on the distribution plate and the pressure port 1, and output to the system. This type of pump performs one suction and one pressure cycle per rotor rotation, hence it is called a single-acting pump. The rotor is subjected to radial hydraulic imbalance force, hence it is also called an unbalanced pump, and its bearing load is relatively large. Changing the eccentricity between the stator and rotor changes the pump's displacement; therefore, these pumps are all variable displacement pumps.

II. Working Principle of a Double-Acting Vane Pump

The working principle of the ATOS vane pump is similar to that of a single-acting vane pump, the only difference being that the stator surface consists of eight parts: two long-radius circular arcs, two short-radius circular arcs, and four transition curves, and the stator and rotor are concentric. When the rotor rotates clockwise as shown in the diagram, the volume of the sealed working chamber gradually increases at the upper left and lower right corners (the suction zone), and gradually decreases at the lower left and upper right corners (the pressure zone); a sealing zone separates the suction and pressure zones. With each rotor revolution, each sealed working chamber completes two suction and two pressure actions, hence the name double-acting vane pump. The two suction zones and two pressure zones of the pump are radially symmetrical, and the hydraulic pressure acting on the rotor is radially balanced; therefore, it is also called a balanced vane pump. The instantaneous flow rate of a double-acting vane pump is pulsating, and the pulsation rate is small when the number of vanes is a multiple of 4. Therefore, the number of vanes in a double-acting vane pump is typically 12 or 16. Model table of ATOS vane pump:

PFE-31028/1DV

PFE-31036/1DT

PFE-31036/1DU 20

PFE-31036/1DV 20

PFE-31036/1DW

PFE-31044/1DT 20

PFE-31044/1DU 20

PFE-31044/1DV 20

PFE-32028/3DT 20

PFE-32028/3DV 20

PFE-32036/3DT

PFE-41037/1DU 20

PFE-41045/1DT

PFE-41045/1DU 20

PFE-41045/1DW 20

PFE-41056/1DT PFE-41056/1DU 20

PFE-41056/1DV 20

PFE-41056/1DW 20

PFE-41070/1DT

PFE-41070/1DV 20

PFE-41070/2DT 20

PFE-41070/2DV 20

PFE-41085/1DT 20

PFE-41085/1DW 20

PFE-42045/3DW 20

PFE-42056/3DU 20

PFE-42070/3DT 20

PFE-42070/3DU

PFE-42070/3DW 20

PFE-42070/7DV

PFE-51090/1DT 23 PFE-51090/1DU

PFE-51110/1DT 23

PFE-51110/1DU 23

PFE-51110/3DT 23

PFED-43037/016/3SUO 20

PFED-43037/022/1DVO 20

PFED-43045/028/1DTO 20

PFED-43045/044/1DTO

PFED-43045/044/1DVO 20

PFED-43056/016/1DTO

PFED-43070/016/1DUO

PFED-43070/044/1DUO 20

PFED-43070/044/1DVO PFED-54090/070/1DUO 21

PFED-54090/070/1DVO 21

PFED-54090/070/3DUF 21

PFED-54110/029/1DTO 21

PFED-54110/029/1DUO

PFED-54110/056/1DUO 21

Key Management Points for ATOS Vane Pumps:

In addition to preventing dry running, overload, air intake, and excessive vacuum, ATOS vane pumps should also be protected against:

1. Changing the pump's rotation direction changes its suction and discharge directions. Vane pumps have a prescribed rotation direction and cannot be reversed. This is because the rotor blade slots are inclined, the blades have chamfered edges, the blade bottoms communicate with the discharge chamber, and the throttling grooves and suction/discharge ports on the distribution plate are designed for a predetermined rotation direction. Reversible vane pumps must be specially designed.

2. 3. **Vannel Pump Assembly:** The distributor plate and stator must be correctly positioned using locating pins. The vanes, rotor, and distributor plate must not be installed backwards. The suction area on the inner surface of the stator is most prone to wear; if necessary, it can be flipped over to convert the original suction area into a discharge area for continued use.

4. **Disassembly and Assembly:** Ensure the working surfaces are clean. The oil should be well filtered during operation.

5. **A clearance too large in the vane slots will increase leakage; too small a clearance will prevent the vanes from freely extending and retracting, leading to malfunction.

6. **Axial clearance of the vane pump has a significant impact on ηv:**

1) Small pumps: 0.015～0.03mm

2) Medium pumps: 0.02～0.045mm

7. **Oil temperature and viscosity:** Generally, the temperature should not exceed 55℃, and the viscosity should be between 17～37mm²/s. Too high a viscosity will make oil suction difficult; too low a viscosity will result in severe leakage. An ATOS vane pump is a pump in which vanes in the rotor slots contact the pump casing (stator ring) to push the sucked liquid from the inlet side to the outlet side.