Vofcit Pump Industry
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02
2023
-
06
The structural difference between external gear pump and internal gear pump
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First, the structure of external gear pump
External gear pumps consist mainly of a pair of bearing-supported gears and a housing with front and rear covers. The drive shaft extends out of the front cover and is sealed by a shaft seal. Bearing forces are absorbed by special bearing gaskets (thin-walled bearings) that are elastic enough to create surface contact instead of linear contact.
They also ensure good wear resistance, especially at low speeds. 12-tooth gear pump minimizes flow pulsation and noise. Using a pressing force proportional to the oil outlet pressure, an internal seal can be achieved, ensuring optimal efficiency.
At the end of the gap between the gear teeth of the pressure oil, the bearing seals it. By introducing the working pressure into the rear of the bearing, the sealing zone between the gear teeth and the uranium bearing can be controlled. Special sealing for the boundary of the area. The radial clearance of the gear tip is sealed by an internal force that presses the tip tightly against the housing.
1 block circle; 2 shaft seal; 3 a front cover; 4 a plain bearing; 5 must be pinned; 6 one gear; 7 a gear (active); 8. Seal the outside first; 9 one pump housing; 10 one bearing: 11 one axial seal area; 12 a bracket; 13 end caps; 14 a fixing screw
Second, the structure of internal meshing gear pump
Oil absorption and pressure process: the pinion shaft 3 of the compression pressure support drives the inner ring gear 2. In the oil absorption zone at an angle of about 90°, the rotary movement increases the volume of the oil suction chamber. This creates a negative pressure and causes the oil to flow into the suction chamber. The crescent-shaped oil distribution plate assembly 9 separates the oil suction chamber from the pressure chamber. In the pressure oil chamber, the teeth of pinion shaft 3 re-enter the interdental of ring gear 2. The liquid is extruded through the pressure oil channel P.
Axial compensation: The axial compensation force FA acts in the pressure oil zone and acts on the axial plate 5 through the pressure zone 10. The axial face clearance between the rotating and fixing parts is thus quite small, thus guaranteeing an optimal axial seal of the oil chamber.
Radial compensation: The radial compensation force FR acts on the oil distribution tray 9.1 and the oil distribution plate frame 9.2.
Due to the action of the working pressure, the oil distribution plate 9.1 and the oil distribution plate frame 9.2 are pressed against the tooth top of the pinion shaft 3 and the inner ring gear 2. The area ratio between the oil distribution tray and the oil distribution plate frame and the position of the sealing roller 9.3 are designed so that the gap seal between the inner ring gear 2, the oil distribution plate assembly 9 and the pinion shaft 3 is achieved as leak-free as possible.
The spring element under the seal roller 9.3 provides sufficient extrusion force even at extremely low pressures.
Hydrodynamic and hydrostatic bearings: The force acting on the pinion shaft 3 is undertaken by the radial plain bearing 4 lubricated by hydraulic dynamic pressure, and the force acting on the inner ring gear 2 is undertaken by the hydrostatic bearing 11.
Meshing: meshing for involute teeth. Small flow pulsation and pressure pulsation due to its large meshing length; This minimal pulsation makes an excellent contribution to low-noise operation.
1. 1 pump body; 2 a bearing shortage; 2 an inner ring gear; 3 pinion shaft; 4 a plain bearing; 5 axial plates; 6 end caps; 7 one installation flange; 8 stop pin; 9 a pan assembly; 9 a oil pan; 9.2 One oil pan rack; 9.3 A sealing roller; 10 a pressure zone; 11. A hydrostatic bearing
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