Inside engaged gear pump with static pressure supporting device

Abstract

The invention discloses an inside engaged gear pump with a static pressure supporting device. The inside engaged gear pump comprises a pump body, an external gear and an internal gear, which are arranged closely to one side of the pump body and are meshed, and a swing link between the external gear and the internal gear; and the swing link divides a non-meshing area between the external gear and the internal gear into an oil absorption area and an oil pressing area. The inside engaged gear pump is characterized in that a static pressure supporting device is arranged on an external side of the internal gear and corresponding to the oil pressing area in the pump body; the static pressure supporting device comprises a supporting plate fixed in the pump body and for supporting the internal gear; the supporting plate is provided with an arc surface cooperating with an outer circumference of the internal gear; the arc surface is provided with at least one groove corresponding to the oil pressing area; and the groove communicates with the oil pressing area through a plurality of small holes on the internal gear. According to the invention, the static pressure supporting device is used to bear radial unbalanced force from the internal gear, reduce the friction between the periphery of the internal gear and the support thereof, and further reduce the heat and wear of the two, and thereby improving output pressure and mechanical efficiency of the gear pump and prolonging service life.

Description

technical field [0001] The invention relates to an internal meshing gear pump, in particular to an internal meshing gear pump provided with a static pressure support device. Background technique [0002] The current conventional internal gear pump usually includes a pump body and an external gear and an internal gear arranged in the pump body. The external gear and the internal gear are meshed on one side, and the other side is separated by a crescent plate. The crescent plate divides the non-meshing area between the external gear and the internal gear into two spaces, the space where the two gears are disengaged is the oil-absorbing area, and the space tending to mesh is the oil-pressing area. The external gear is generally connected with the transmission shaft or made into one body, and is driven to rotate by the driving device. When the internal gear pump is working, the external gear rotates at a high speed and drives the internal gear to rotate. During the transmission...

AI Technical Summary

Problems solved by technology

[0003] However, the current above-mentioned internal gear pump mainly has the following problems: when the internal gear pump is working, the higher the output pressure, the radial imbalance suffered by the internal gear The greater the force, the greater the friction and heat between the outer circumference of the internal gear and the pump body that supports it, and the greater the wear and tear, the lower the mechanical efficiency of the gear pump and the shorter its life.

The above-mentioned defects are especially obvious in high-pressure (higher than 12Mpa) internal meshing gear pumps, which also results in the current domestic production of internal meshing gear pumps with limited pressure specifications.

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