Publish Time: 2023-10-27 Origin: Site
In hydraulic systems, common hydraulic oil pumps mainly include vane pumps, HYDRAULIC GEAR PUMP, and plunger pumps. Internal gear pumps are available in involute and cycloidal tooth profiles. Its working principle and main features are the same as the external meshing HYDRAULIC GEAR PUMP, except that the sizes of the two gears are different, and the moving internal gears rotate in the same direction with their respective centers.
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Composition of internal meshing HYDRAULIC GEAR PUMP
Structure of Inner Engagement HYDRAULIC GEAR PUMP
It is composed of a pair of gears installed in the housing. There are end covers on both sides of the gears. The housing, the end covers, and the interdental grooves of the gears form many sealed working chambers. Due to the gradual disengagement of the gear teeth on the right side of the oil suction chamber, the sealing working volume gradually increases and a partial vacuum is formed. Therefore, under the action of the external atmospheric pressure, the oil in the oil tank enters the oil suction chamber through the oil suction pipe, and the interdental groove is Filled, and with the rotation of the gear, the oil is brought to the left pressure oil chamber. On the side of the oil pressure area, because the gear teeth gradually enter into mesh here, the volume of the sealed working chamber is continuously reduced, and the oil is squeezed out and transported from the oil pressure chamber to the pressure pipeline. During the working process of the HYDRAULIC GEAR PUMP, as long as the rotation direction of the two gears remains unchanged, the positions of its suction and oil discharge chambers will also remain unchanged. Here, the tooth surface contact line at the meshing point has been separating the high and low-pressure chambers for oil distribution, so there is no need to set up a special flow distribution mechanism in the HYDRAULIC GEAR PUMP, which is different from other types of positive displacement hydraulic pumps.
In the involute internal gear pumps, a crescent plate is installed between the pinion and the internal gear to separate the oil suction chamber from the pressure oil chamber. When the pinion drives the internal gear to rotate, the left half of the gear teeth withdraw from meshing to form a vacuum to complete the oil absorption process. The oil that enters the tooth groove is brought to the oil pressure chamber, and the right half of the gear teeth enter into the mesh to squeeze out the hydraulic oil and discharge the oil from the oil pressure port. Compared with the external meshing HYDRAULIC GEAR PUMP, it has the advantages of small flow pulsation, more compact structure, lightweight, low noise, high efficiency, and no trapped oil phenomenon. Its disadvantage is that the tooth shape is complicated, and special high-precision processing equipment is required for processing. In the cycloidal internal meshing HYDRAULIC GEAR PUMP (also known as the cycloidal rotor pump), the pinion and the internal gear differ by one tooth. When the pinion drives the internal gear to rotate, all the teeth of the pinion are meshed to form several independent pumps. The sealed chamber does not need to set a crescent plate. With the meshing and rotation of the internal and external gears, the volume of each sealing chamber changes, thereby performing oil absorption and oil pressure. It is characterized by a compact structure, few parts, large working volume, high speed, stable movement, and low noise. However, due to the small number of teeth, the flow pulsation is large, and the gap leakage at the meshing point is large, so the working pressure of this pump is low (generally 2.5-7MPa), and it is usually used as an auxiliary pump for lubrication and oil replenishment.
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