Gear ring pump

Abstract

The invention provides an internal engaged gear pump which improves the original bases of a shell, an internal gear ring sleeved in the internal chamber of the shell which can be freely rotated, a small gear engaged with the internal gear ring and positioned on a transmission shaft, and a crescent block arranged between the addendum of the small gear and the addendum of the internal gear ring, etc., namely, the outside of the internal gear ring is also matched in clearance with a composite lining positioned in the internal chamber of the shell; the composite lining consists of a base, an alloy layer burned on the internal surface of the base, and a polymer material layer coated on the alloy layer and taking the polytetrafluoroethylene as mainbody. After the structure is adopted, the invention can avoid direct contact between the internal gear ring and the internal surface of the pump body, greatly reduces the pulling and engagement phenomena; therefore, the invention has the advantages of good working reliability and long service life; furthermore, by virtue of the friction pair of the steel-polytetrafluoroethylene, the friction coefficient is reduced by a magnitude; the invention has good self-lubrication performance and can obviously improve the friction characteristic; meanwhile, the invention has the advantages of low operation noise, high volume efficiency and strong anti-corrosion capability.

Description

technical field [0001] The invention relates to a gear pump, in particular to an internal meshing gear pump. Background technique [0002] At present, internal gear pumps have been widely used in various industrial fields, and their structures and types are various. Among them, the more representative one is the "Internal Gear Pump" with the Chinese Patent Publication No. CN1412439A, which includes a pump body with a front pump cover and a rear pump cover and a transmission shaft with a pinion, and the inside of the front and rear pump covers Correspondingly, a front bearing support and a rear bearing support are provided. Bearings are respectively installed in the shaft holes of the front and rear bearing supports, and they form a rotation fit with the transmission shaft; Rotating and floating ring gear meshing, the center of the ring gear and the center of the pinion are offset from each other, so as to form a region of deepest mesh and an opposite region; in the deepest ...

AI Technical Summary

Problems solved by technology

[0004] However, all kinds of internal gear pumps designed in the prior art have a common feature: the inner ring gear slides directly on the surface of the pump body, that is, the high-speed rotation of the inner ring gear and the radial force directly act on the pump body On the surface, the outer surface of the inner ring gear is in direct contact with the inner surface of the pump body, so that during the working process, the pollutants in the oil will scratch the outer surface of the inner ring gear and the inner surface of the pump body, and thus cause internal The strain and bite between the ring gear and the pump body support surface until the wear fails, especially when the internal meshing gear pump is under higher pressure, the above defects will be more obvious, thus affecting the reliability of the internal meshing gear pump Sex and service life

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