Motor-Pump Unit Integrated Housing Leakage Channel Loop
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Solution Overview
Problem
Existing motor-pump units face issues with complexity, high manufacturing costs, and potential for premature failure due to design complexities, noise, pulsation, and sensitivity to environmental factors like water and temperature, while requiring a compact and durable structure with extended service life and cost-effective production.
Innovation Solution
A motor-pump unit with a multi-part housing containing an internal gear machine and an electric motor, featuring a crescent-shaped free space with radial and axial sealing segments, check valves, and a leakage channel loop for efficient fluid management and sealing, ensuring low noise, high dynamics, and resistance to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional motor-pump unit design is used, then the unit can perform basic hydraulic functions, but it suffers from complex structure, high manufacturing costs, and premature failure
Solution Approach 1:
The patent combines the motor housing and pump housing into a single integrated housing structure. The motor stator is directly mounted on the pump housing, eliminating the need for separate motor and pump housings. This merging reduces the number of parts, simplifies manufacturing, and improves reliability by reducing potential failure points from multiple housing joints and seals.
2Reliability
If conventional sealing methods are used in the motor-pump unit, then basic sealing is achieved, but the unit is sensitive to environmental factors like water and temperature
Solution Approach 1:
The patent introduces a deliberate leakage channel that allows controlled fluid communication between the high-pressure working chamber and the motor cavity. This controlled leakage prevents pressure buildup that could damage seals, and the fluid serves as a lubricant for the shaft bearing. The check valve ensures unidirectional flow, converting potential harmful leakage into a beneficial lubrication system that protects against environmental factors.
3Ease of manufacture
If conventional leakage management is used, then basic fluid containment is achieved, but additional forced lubrication systems are required
Solution Approach 1:
The patent creates a self-lubricating system where the hydraulic fluid naturally leaks from the high-pressure working chamber through a controlled leakage channel into the motor cavity, providing continuous lubrication to the shaft bearing. The check valve ensures unidirectional flow, and the system uses its own operating fluid for lubrication without requiring external grease fittings or separate lubrication pumps, simplifying manufacturing and maintenance.
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
The solution provides a compact, durable, and cost-effective motor-pump unit with enhanced service life, low noise, and resistance to environmental stressors, ensuring reliable operation in dynamic hydraulic systems.
Implementation Method 1
The leakage channel loop extends at least to a region of a rotor end of the rotor extending away from the pinion and comprises a leakage shaft channel extending axially in or through the shaft and at least one leakage rotor channel fluidly connected to the leakage shaft channel
Implementation Method 2
The first and second connection channels are connected via check valves arranged in the housing or in a housing part of the housing that delimits the working chamber to a leakage channel loop
Implementation Method 3
at least one leakage channel fluidly connected to the working chamber 24 for the discharge of a leakage that forms during the operation of the internal gear machine, in particular with a radial and/or axial gap seal, preferably by means of radial sealing segments and/or at least one axial sealing plate
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a motor-pump unit with a multi-part housing (25) comprising a reversible internal gear machine (21) and an electric motor (22) with a rotor (22.1) and a stator (22.2), which is coupled to the internal gear machine (21) via a shaft (23) rotatably mounted in the housing (25). The shaft (23) extends axially away from the internal gear machine (21) at one end through the rotor (22.1) supported by the shaft (23). A first connecting channel and a second connecting channel open into a working chamber of the internal gear machine (21) and are connected via check valves arranged in the housing (25) to a leakage channel loop, which is fluidly connected to at least one leakage channel fluidly connected to the working chamber and which includes a leakage shaft channel extending axially through the shaft (23) and a fluid-connected leakage shaft channel extending axially through the rotor (22).1) extending leakage rotor channel and/or a leakage gap channel formed between the rotor (22.1) and the stator (22.2) which is fluidly connected to the leakage shaft channel.