Germany Rexroth R900932137 vane pump distributor solenoid valve

The working principle of the Rexroth vane pump is mainly based on the centrifugal force and pressure oil acting on the inner surface of the stator when the rotor rotates, forming a sealed working volume, and achieving oil suction and discharge processes through volume changes. It is specifically divided into two types: single acting vane pumps and double acting vane pumps.

Working principle of single acting vane pump

The single acting vane pump is mainly composed of components such as oil distribution plate, drive shaft, rotor, stator, blades, and pump body. The inner surface of the stator is cylindrical, and the rotor has uniformly distributed narrow slots in which the blades are installed and can slide. There is eccentricity between the rotor and stator. When the rotor rotates, the blades are tightly attached to the inner surface of the stator under centrifugal force and the pressure of the introduced pressure oil at the root of the blades, thereby forming multiple sealed working volumes. When the drive shaft drives the rotor to rotate, the right side of the blade gradually extends outward, the sealing working volume gradually increases, and a local vacuum is generated. The pump oil absorption process is completed through the oil inlet and the oil suction window on the distribution plate; On the left side of the blade, the blade gradually presses back into the oil groove on the inner surface of the stator, and the sealing working volume gradually decreases. The oil is squeezed out through another window of the oil distribution plate and the oil pressure port and output into the system. The pump rotor completes an oil suction and hydraulic process with each rotation, hence it is called a single acting vane pump. The rotor of this pump is subjected to unidirectional radial unbalanced force, also known as unbalanced vane pump or non unloading vane pump, and its bearing load is relatively high. Changing the eccentricity between the stator and rotor can change the displacement of the pump, so these pumps are all variable displacement pumps.

Working principle of double acting vane pump

The working principle of a double acting vane pump is similar to that of a single acting vane pump, except that the stator surface consists of eight parts: two long radius arcs, two short radius arcs, and four transition curves, and the stator and rotor are concentric. When the rotor rotates clockwise in the diagram, the volume of the sealed working chamber gradually increases at the upper left and lower right corners, which are the oil suction area, and gradually decreases at the lower left and upper right corners, which are the oil pressure area; There is a sealing area between the oil absorption area and the oil pressure area to separate them. This type of pump is called a double acting vane pump because each sealed working chamber completes two oil suction and pressure actions for each rotation of the rotor.

The REXROTH vane pump from Germany is renowned for its high performance and reliability. The following is detailed information about the characteristics and functions of the R900932137 vane pump model:

characteristic:

Low noise: The Rexroth vane pump adopts several sound insulation and vibration prevention mechanisms, which have low noise and no vibration during operation, making it particularly suitable for machine tools and indoor use environments.

Variable displacement: Rexroth vane pumps have adjustable displacement, such as the PV7 series, with lower flow pulsation and higher repeatability, as well as lower pressure peaks.

Hydraulic lubricated sliding bearings: This design can extend the service life of the bearings and ensure the long-term stable operation of the pump.

Pressure and flow control: Rexroth vane pumps have pressure and flow adjustment devices. When the system pressure is higher than the set pressure of the pump, the flow rate will decrease, thereby reducing power loss and improving efficiency.

Installation and connection dimensions: comply with VDMA24560/1 and ISO3019-2 standards, making it easy to install and connect with other devices.

Function:

Energy saving: The Rexroth vane pump can have automatic high-speed flow and compensation functions under pressure setting, with less power loss and lower heat generation compared to quantitative vane pumps, making it an efficient and energy-saving vane pump.

System protection: Due to its pressure and flow control functions, the Rexroth vane pump can protect the system from the effects of excessive pressure and flow, avoiding serious problems such as motor burnout and transmission component breakage.

Multi pump combination: The standard single pump of PV7 series can be flexibly combined into multiple pumps, and can also be used in combination with internal gear pumps, external gear pumps, axial piston pumps, and radial piston pumps to meet the needs of different systems.