Parker-Hannifin Corporation

Pmc Liquiflo Equipment Co., Inc.

Yu-Sen James Chu

Hao Zhang

Satish Kumar Raju Kalidindi

David Jonathan Sandy

Frank Iannizzaro

Steven R Huard

Patrick C Toops

Brian Burgess

Suresh Natarajan

Lori Ann DiLisi

Robb Fisher

An example gear pump includes a pump housing having a pump housing channel and an arcuate groove disposed in an interior surface of the pump housing; a pump ring gear disposed within the pump housing and rotatable relative to the pump housing; a pump pinion disposed within the pump ring gear, such that teeth of the pump pinion engage with internal teeth of the pump ring gear; and a pump port block having a first port and a second port, wherein as the pump pinion rotates within the pump ring gear, fluid is drawn through the first port and provided to the second port for discharge, wherein a portion of fluid being provided to the second port is provided to the pump housing channel, wherein fluid from the pump housing channel is provided to the arcuate groove to apply a radially-inward force on the pump ring gear.

Assemblies for a hydraulic gear pump with force balance and internal cooling features

An example assembly comprises: a main housing; an electric motor disposed in the main housing and comprising a stator fixedly positioned in the main housing, and a rotor positioned within the stator; a hydraulic pump positioned in the main housing and at least partially within the rotor, wherein the hydraulic pump is configured to receive fluid from an inlet port and provide fluid flow to an outlet port, wherein the hydraulic pump comprises a pump shaft rotatably coupled to the rotor of the electric motor; a controller housing coupled to the main housing; and a motor controller comprising one or more circuit boards disposed within the controller housing and configured to generate electric current to drive the electric motor.

Electric motor with integrated hydraulic pump and motor controller

An example assembly comprises: a pump cover; a thrust plate configured to interface with the pump cover at a first side of the thrust plate and interface with gears of a gear pump at a second side of the thrust plate; and a seal disposed within a seal cavity formed at an interface between the thrust plate and the pump cover, wherein the seal defines multiple partitions at the interface between the thrust plate and the pump cover and seals each partition of the multiple partitions from other partitions.

Hydraulic gear pump with axial compensation

An example crescent seal assembly comprises: an outer crescent of a gear pump; an inner crescent of the gear pump mating with the outer crescent such that an exterior peripheral surface of the inner crescent interfaces with an interior peripheral surface of the outer crescent, forming: (i) a spring cavity, (ii) a first check valve cavity, and (iii) a second check valve cavity therebetween; a spring disposed in the at least one spring cavity; a first check pin disposed in the first check valve cavity; and a second check pin disposed in the second check valve cavity.

Hydraulic gear pump with radial pressure compensator

A pump and motor assembly () includes a centrifugal pump (), a bent axis hydraulic pump, and a wet-type drive motor (). The motor has a rotor and a stator that are submerged in hydraulic fluid for full lubrication and cooling. A drive shaftis driven by the motor. The centrifugal pump has a rotatable impeller () for pumping hydraulic fluid from an inlet () to the bent axis hydraulic pump. The centrifugal pump also pumps fluid to the motor for lubrication and cooling. The bent axis hydraulic pump pumps the fluid and discharges the fluid from the system. The centrifugal pump and the bent axis hydraulic pump are rotatable along a common rotational axis Rthat is angled relative to the rotational axis Rof the drive shaft.

Bent axis hydraulic pump with centrifugal assist

A high speed, rotary lobe gear pump assembly is provided which combines a positive displacement lobe gear pump having wipers with a centrifugal pump utilizing an impeller. The centrifugal pump feeds high pressure fluid flow directly into the lobe gear pump allowing the gear pump to rotate at high speeds without cavitation. The high speed capability of the pump assembly allows the lobe gear pump to operate without speed reduction gearing for the motor shaft.

Lobe gear pump with inducer assembly and centrifugal pump having one fluid flow path

A flame arrestor for a fuel pump having housing extending intermediate an upstream end defining an inlet port and a downstream end defining an outlet port coupled in fluid communication with the outlet port along a fluid flow path. The fuel pump further has a motor operably coupled to a pumping element. The arrestor is provided as a body received within the housing intermediate the outlet port and the motor. The arrestor body, which is formed of an open-cell foam material having an average pore size and thickness selected as being both fluid permeable and adapted to prevent an ignition source from propagating therethrough, is disposed in the fluid flow path such that fuel from the pumping element tank may be pumped to the outlet port through the body with the ignition source being prevented from passing into the outlet port.

Flame arrestor system for fuel pump discharge

A flame arresting system for a centrifugal fuel pump of a variety including a downstream impeller and an upstream inlet port. The system includes an arrestor body which is received with the inlet port within an associated fuel tank. The body is formed of an open-cell foam material having an average pore size and thickness selected as being both fluid permeable and adapted to prevent flame from propagating therethrough. The inlet port is contained within the body such that fuel within the fuel tank may be drawn into the inlet port through the arrestor body, with flame being prevented from passing into the tank from the inlet port.

Flame arrestor system for fuel pump inlet

A centrifugal pump for a fluid tank includes a pump housing enclosing an electric motor, a primary impeller coupled to the drive shaft of the motor, and a secondary impeller extending axially downward from the primary impeller proximate to the floor of the tank. The secondary impeller has a central stem and helical blades formed integrally with the stem and extending radially outward therefrom. An outer shroud encloses the central stem and helical blades of the secondary impeller. The outer shroud is fixedly secured to the helical blades and rotates in conjunction with the secondary impeller. The secondary impeller is either formed in one piece with the primary impeller or is removably attached by, e.g., screwing a threaded shaft on the secondary impeller into a corresponding through-bore in the primary impeller and the motor drive shaft. The secondary impeller has a smaller diameter than the primary impeller such that the primary impeller has a first fluid flow path directly from the fuel tank and a second fluid flow path through the secondary impeller. When the level of fluid in the tank is above the level of the primary impeller, the primary impeller draws fluid directly from the tank into the pump. The secondary impeller also provides a small amount of fluid to the primary impeller, and the primary impeller operates at or near its maximum possible capacity. When the level of fluid falls below the working level of the primary impeller, the primary impeller ceases to draw fluid directly from the tank, however, the secondary impeller continues to draw fluid up to the primary impeller to maintain operation of the pump. The secondary impeller thereby draws fluid down to a lower level in the tank to maximize the amount of usable fuel in the tank.

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Westlake, OH, United States of America

Yu-Sen James Chu