Motor-Pump Unit Radial Sealing Segments for Reversing Pulsation
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Solution Overview
Problem
Motor-pump units face challenges with pressure medium delivery continuity and pressure pulsations during reversing operations, leading to incontinuity in pressure medium volume flow and increased noise and pulsation.
Innovation Solution
The motor-pump unit incorporates a multi-part housing with an internal gear machine and radial sealing segments that include a pinion segment and a ring gear segment, featuring a sealing plate control channel and radial sealing segment control channels, which are pressurized to maintain radial compensation pressure and ensure optimal sealing during direction reversals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple sealing structure is used in the internal gear machine, then the device complexity is reduced, but pressure pulsations and delivery continuity deteriorate during reversing operation
Solution Approach 1:
The sealing structure is divided into multiple radial sealing segments (pinion segment and ring gear segment) that can move independently. Each segment has control channels that allow pressurized medium to act on specific areas, enabling precise control of sealing forces during direction reversals and preventing delivery discontinuity while maintaining manageable complexity.
Solution Approach 2:
The radial sealing segments are designed to be radially movable rather than fixed, allowing them to dynamically adjust their position and sealing force in response to pressure changes during reversing operation. This dynamic adaptation ensures continuous pressure medium delivery without requiring an overly complex fixed sealing system.
2Reliability
If radial sealing segments are made radially movable for optimal sealing, then pressure medium delivery continuity improves, but the device complexity increases due to additional control channels
Solution Approach 1:
The control channels for the radial sealing segments are merged with the existing gear machine structure. The pinion segment control channel and ring gear segment control channel are integrated into the housing and gear components, allowing pressurized medium to reach the sealing segments through existing flow paths without requiring completely separate control systems.
Solution Approach 2:
The radial sealing segments are actuated by the pressurized medium itself that flows through the machine. The control channels direct the existing pressure medium to act on the segments, causing them to move and seal automatically based on the operating conditions, without requiring external actuators or complex control mechanisms.
3Object-generated harmful factors
If control grooves are positioned opposite tooth gaps for pressure equalization, then noise and pulsation are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The control grooves are strategically positioned at specific locations opposite the tooth gaps where pressure equalization is most effective. Rather than requiring uniform precision throughout the entire structure, the design focuses manufacturing precision on these critical localized areas where the control grooves interface with the pressure medium flow and sealing segments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the motor-pump unit's ability to maintain continuous pressure medium delivery and reduce noise and pulsation, ensuring high dynamics, low noise, and long service life while being insensitive to shock, dirt, water, and temperature variations.
Implementation Method 1
a radial gap is formed between an inner surface of the pinion segment pointing radially outwards towards the ring gear segment and an inner surface of the ring gear segment opposite this, pointing radially inwards towards the pinion segment, and wherein at least one axially movable sealing plate is arranged between the axial end faces of the gears and at least one of the housing parts for axial sealing of the high-pressure area of the working chamber
Implementation Method 2
The at least one axial sealing plate has at least one sealing plate recess open towards the end faces of the gears in the form of a sealing plate control channel that can be pressurized with a pressure medium, which extends from a sealing plate recess, is open towards the radial gap and is located directly opposite the radial gap
Implementation Method 3
an internally toothed ring gear having ring gear teeth, mounted eccentrically with respect to the pinion, are arranged, wherein the ring gear teeth mesh with the pinion teeth in a tooth engagement area
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a motor-pump unit (20) comprising an electric motor (22) and a reversible internal gear motor (21). The latter has a multi-part housing (25) in which an externally toothed pinion (26) and an internally toothed ring gear (30) are arranged. A space is formed between the gears (26, 30) in which a multi-part filler piece is arranged. The filler piece comprises several radially movable radial sealing segments, between which a radial gap is formed. An axially movable axial sealing plate (58.2) is arranged between the axial end faces of the gears (26, 30) and a housing part (25.1, 25.2) of the housing (25). This sealing plate has a sealing plate control groove, open towards the end faces of the gears (26, 30), which can be pressurized and is open towards the radial gap and is located directly opposite it.The pinion segment and/or the ring gear segment have a radial sealing segment control channel that can be pressurized and extends transversely, which is open towards the radial gap and leads directly into the radial gap.