Internal gear pump

Abstract

The invention discloses an internal gear pump with low leakage rate, high feeding power, high pressure and energy-saving capability. The internal gear pump comprises a pump body, a front cover, a rear cover, an internal gear, an internal gear shaft, an irregular sheet, a front valve plate, a rear valve plate, a front support, a rear support, and elastic sealing members, wherein the front cover and the rear cover are arranged at two ends of the pump body; the internal gear and the internal gear pump shaft are eccentrically meshed inside the pump body; the irregular sheet is used for dividing a cavity formed by meshing the internal gear and the internal gear shaft in the pump body into two parts; the front valve plate and the rear valve plate as well as the front support and the rear support are respectively and sequentially arranged between the irregular sheet and the front cover as well as between the irregular sheet and the rear cover; the elastic sealing members are respectively arranged between the front cover and the rear cover as well as between the front support and the rear support; a crescent sheet is further arranged on the irregular sheet and is matched with the irregular sheet to divide the cavity in the pump body into two parts; and a spring is arranged between the irregular sheet and the crescent sheet. According to the invention, the pre-compression amount of the elastic sealing members and the pre-pressure of the spring are utilized to fulfill an axial compensation function and a radial compensation function respectively, so that the internal leakage of the entire pump is prevented.

Description

technical field [0001] The invention relates to the technical field of gear pump manufacturing, in particular to an internal meshing gear pump with high conveying efficiency, high pressure and energy saving. Background technique [0002] Gear pumps are widely used in hydraulic systems and can be divided into external gear pumps and internal gear pumps. Internal gear pumps are often used to transport Newtonian or non-Newtonian liquids in petroleum, chemical, paint, dye, food, oil, pharmaceutical and other industries. The types of liquids to be transported can range from light and volatile liquids to heavy and viscous , even semi-solid liquids. The internal meshing gear pump adopts the principle of internal meshing of the gears. The pitch circle of the inner and outer gears is close to one side, and the other side is separated by a special-shaped piece on the pump cover. The driving gear on the inner gear shaft drives the inner gear to rotate in the same direction. At the in...

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Problems solved by technology

[0003] The internal leakage of the internal gear pump has always been an important factor affecting the power of the internal gear pump to deliver liquid. When the product was just shipped from the factory, the entire internal gear pump The internal leakage is not obvious, which has little effect on its transmission power. However, during the use of the product, due to the friction and wear between the internal gear, the internal gear shaft and the special-shaped piece, the internal leakage becomes more and more obvious. Therefore, it is urgent It needs to be improved to reduce the internal leakage of the internal gear pump and increase its service life

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