A kind of internal meshing gear pump capable of realizing partial axial compensation

Abstract

The invention relates to an internal gear pump capable of achieving partition axial compensation. The internal gear pump comprises a pump body, a gear pair and crescent blocks; a gear shaft is meshed with an internal gear ring to form the gear pair; the crescent blocks are arranged in the gear pair; a left axial compensation device and a right axial compensation device which are the same in structure are symmetrically arranged on the two end faces of the crescent blocks and the gear pair; each axial compensation device comprises a first-level side plate, a second-level side plate and a third-level side plate; a first compensation groove is formed in the outer end face of each first-level side plate; a second compensation groove is formed in the inner end face of each first-level side plate; elastic sealing rings and side plate gaskets are sequentially stacked in the first compensation grooves to form a first-level axial compensation system; springs and the second-level side plates are sequentially stacked in the second compensation grooves to form a second-level axial compensation system; sealing blocks and the third-level side plates are sequentially stacked on the second-level side plates to form a third-level axial compensation system. Partition self-adaption adjustment is carried out on abrasion positions and non-abrasion positions, internal leakage of the pump is effectively reduced, and large-area supporting of the side plates can be still achieved under the abrasion state.

Description

technical field [0001] The invention relates to a gear pump, in particular to an internal meshing gear pump capable of realizing partition axial compensation under high-pressure working conditions. Background technique [0002] High-pressure hydraulic systems are widely used in many equipment such as casting machines, injection molding machines and forging machines. At present, with the development of high-end equipment such as military equipment and offshore drilling platforms, further high-pressure hydraulic systems have become an inevitable trend, and the biggest challenge lies in the development of high-quality high-pressure pumps. [0003] Internal gear pumps are widely used in various types of construction machinery due to their outstanding features such as low noise, small oil trapping, compact structure, and good stability, but they still cannot meet the working requirements of ultra-high pressure hydraulic systems. The main reason is that the internal leakage of th...

AI Technical Summary

Problems solved by technology

[0006] 1) The end face of the side plate wears unevenly, and the axial clearance and leakage in the pump increase due to no compensation in the wear area, and the pressure increase in the pump encounters a bottleneck

The end surface area of ​​the side plate in contact with the gear pair is worn due to relative movement, but the end surface area of ​​the side plate in contact with the crescent block does not wear due to no relative movement, which leads to incomplete fit between the side plate and the end surface of the gear. The amount of internal leakage increases accordingly

[0007] 2) The facet support method under high pressure causes stress concentration in the side plate, increasing the risk of side plate fracture

In addition, after the side plate is worn, the supporting area is greatly reduced, the resultant center of the axial force generated by the back pressure chamber is shifted, the side plate is prone to overturning moment, and the leakage in the pump increases

[0008] 3) The lubricating performance of the side plate is poor, and the joint with the gear shaft is prone to glueing under high speed and high pressure (especially in the water hydraulic environment), which leads to fatigue damage of the pump

As the gear shaft rotates at a high speed in the hole of the side plate, the friction between the gear shaft and the side plate increases in the contact area. When the lubrication is insufficient, it is easy to cause the two to fail to glue together, and the alternating stress at the worn part increases, which will lead to Fatigue damage of gear pump

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