Free shipping sales of German REXROTH Rexroth gear pump

The concept of the German REXROTH gear pump is very simple. Its most basic form is two gears of the same size meshing and rotating with each other in a tightly fitting housing. The interior of this housing is similar to an "8" shape, with two gears installed inside. The outer diameter and sides of the gears are tightly fitted with the housing. The material from the extruder enters the space between two gears at the suction port and fills it. It moves along the shell with the rotation of the teeth and is finally discharged when the two teeth mesh.

The German REXROTH gear pump, also known as a positive displacement device, is like a piston in a cylinder. When one tooth enters the fluid space of another tooth, because the liquid is incompressible, the liquid and the tooth cannot occupy the same space at the same time, so the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, thus providing a continuous discharge at the pump outlet. The amount discharged is the same for each rotation of the pump. As the drive shaft rotates continuously, the pump also continuously discharges fluid. The flow rate of a pump is directly related to its rotational speed.

The REXROTH gear pump from Germany is driven by an independent motor, which can effectively block upstream pressure and flow fluctuations. The pressure pulsation at the outlet of the gear pump can be controlled within 1%. Using a gear pump on the extrusion production line can increase the flow output speed, reduce material shear and residence time in the extruder.

When the REXROTH gear pump from Germany is working, the driving wheel rotates together with the electric motor and drives the driven wheel to rotate accordingly. When the meshing teeth on one side of the suction chamber gradually separate, the volume of the suction chamber increases, the pressure decreases, and the liquid in the suction tube is sucked into the pump; The inhaled liquid is divided into two paths and pushed into the discharge chamber by the gear in the tooth groove. After the liquid enters the discharge chamber, due to the continuous meshing of the teeth of the two gears, the liquid is squeezed and enters the discharge pipe from the discharge chamber. The driving gear and the driven gear continuously rotate, allowing the pump to continuously suck in and discharge liquid.

The REXROTH gear pump from Germany not only has self-priming ability and is independent of flow and discharge pressure, but also has no suction valve or discharge valve on the pump casing. It has the characteristics of simple structure, uniform flow rate, and reliable operation. However, it has low efficiency, high noise and vibration, and is easy to wear. It is mainly used to transport various oils that are non corrosive, non solid particles, and have lubricating ability. The temperature generally does not exceed 70 ℃, such as lubricating oil, edible vegetable oil, etc. The general flow range is 0.045-30ms/h, the pressure range is 0.7-20MPa, and the working speed is 1200-4000r/min.

Free shipping sales of German REXROTH Rexroth gear pumpStructural characteristics:

(1) Simple structure and affordable price;

(2) Low job requirements and wide application;

(3) The end caps and various inter tooth grooves of the gears form many fixed sealed working chambers, which can only be used as quantitative pumps.

The gear adopts a new technology with excellent international standards in the 1990s - double arc sine curve tooth profile arc. Compared with involute gears, its outstanding advantage is that there is no relative sliding of the tooth profile during the gear meshing process, so there is no wear on the tooth surface, balanced operation, no trapped liquid phenomenon, low noise, long service life, and high efficiency. This pump breaks free from the constraints of traditional design, allowing gear pumps to enter a new field in design, production, and use.

The pump is equipped with a differential pressure safety valve as overload protection, and the full reflux pressure of the safety valve is 1.5 times the rated discharge pressure of the pump. It can also be adjusted according to actual needs within the allowable discharge pressure range. However, this safety valve cannot be used as a pressure reducing valve for long-term operation. The pressure reducing valve can be installed separately when needed.

Free shipping sales of German REXROTH Rexroth gear pumpTo work smoothly, the overlap degree of gear meshing must be greater than 1, so there are always two pairs of gears meshing at the same time, and some of the oil is trapped between the closed chambers enclosed by the two pairs of gear teeth. This closed chamber gradually decreases with the rotation of the gear, and then gradually increases again. The reduction in the volume of the enclosed chamber will cause the trapped oil to be compressed, resulting in high pressure and extrusion from the gaps, causing the oil to heat up and causing additional loads on the components; The increase in the volume of the enclosed chamber causes local vacuum, which separates the dissolved gases in the oil and produces cavitation. These will generate strong vibrations and noise, which is the phenomenon of trapped oil in gear pumps.