Axial piston pump with piston having passive cooling thermal relief feature
a technology of passive cooling and piston, applied in the direction of pump components, positive displacement liquid engines, machines/engines, etc., can solve the problems of reducing the volumetric efficiency of the pump, limiting the usefulness of the pump, and generating significant frictional heating of the piston pump
Inactive Publication Date: 2021-04-01
HONEYWELL INT INC
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- Abstract
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- Application Information
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Benefits of technology
The invention is an axial piston pump that is designed to move fluid. It includes a rotor with a bore and a piston that moves back and forth to change the volume of a pump chamber. The outer surface of the piston has a leakage interface that allows fluid to pass through it and cool the pump. The piston also has a relief feature on its outer surface that creates a pocket of fluid that moves with the piston. This design helps to keep the pump cool even during use.
Problems solved by technology
A piston pump can generate significant frictional heating during operation.
The sliding motion of the pistons can generate heat that may limit the usefulness of the pump.
Some of these pumps may be inappropriate for pumping certain fluids because of the heat generated.
Although these active cooling systems can cool the pump, there may be a significant amount of leakage flow, resulting in a noticeable decrease in the pump volumetric efficiency.
Including these active cooling systems can also increase manufacturing costs and complexity of the pump.
Method used
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Embodiment Construction
[0016]The following detailed description is merely exemplary in nature and is not intended to limit the present disclosure or the application and uses of the present disclosure. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.
[0017]Broadly, example embodiments disclosed herein include pump systems with a piston pump, such as an axial piston pump, having improved cooling features. One or more pistons of the pump may include a relief feature. The relief feature may be a groove, notch, or other feature recessed slightly into the outer surface (outer diameter surface) of the piston. As such, the piston outer surface may have one diameter at the relief feature and a larger diameter at other regions adjacent thereto. Conversely, the bore inner surface (inner diameter surface) may be continuous and smooth in regions that oppose the relief feature. Thus, the bore inner diameter may remain substantially ...
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A piston pump includes a rotor member with a bore therein. The bore is defined by an inner surface. The piston pump also includes a piston supported for reciprocating movement in an axial direction within the bore to change a volume of a pump chamber that is cooperatively defined by the piston and the rotor member. The piston has an outer surface that faces the inner surface with a leakage interface defined therebetween. The leakage interface is configured to receive a passive leakage flow of a fluid from the pump chamber through the leakage interface to provide cooling. Moreover, the outer surface includes a relief feature that is recessed into the outer surface to define, with the inner surface, a cooling pocket of the leakage interface. The cooling pocket moves in the axial direction relative to the inner surface with the reciprocating movement of the piston.
Description
TECHNICAL FIELD[0001]The present disclosure generally relates to a piston pump and, more particularly, relates to an axial piston pump with one or more pistons that include a passive cooling relief feature.BACKGROUND[0002]There are various types of pumps configured for pumping fluids. For example, there are various types of positive displacement, continuous travel piston pumps that have been developed for various uses.[0003]A piston pump can generate significant frictional heating during operation. The sliding motion of the pistons can generate heat that may limit the usefulness of the pump. Some of these pumps may be inappropriate for pumping certain fluids because of the heat generated.[0004]Active cooling systems may be included to address these problems. For example, some hydraulic fluid pumps include coolant lines or ports that provide a flow of coolant fluid. Although these active cooling systems can cool the pump, there may be a significant amount of leakage flow, resulting i...
Claims
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IPC IPC(8): F04B39/06F04B27/08
CPCF04B39/066F04B27/0878F04B39/064F04B1/141F04B1/124F04B1/122
Inventor PARSONS, ABIGAILROWAN, WILLIAM SCOTTPORTOLESE, LARRY
Owner HONEYWELL INT INC