Slanted-Axis Axial Piston Pump With Pre-Compression for Quiet High-Speed Flow
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Solution Overview
Problem
Existing axial piston machines in slanted axis designs, primarily used as pumps, experience noise and vibration issues at high speeds due to pressure pulsations, and are not self-priming, while those designed as engines operate at low speeds with constant displacement volume.
Innovation Solution
Incorporating a pre-compression chamber connected via a connecting channel to a tapping opening, with a control surface and counter-control surface arranged to minimize pressure pulsations and ensure self-priming, and using a variable speed electric motor to manage flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If axial piston machine operates at high speeds as a pump, then flow rate increases, but noise and vibration increase due to pressure pulsations
Solution Approach 1:
The pre-compression chamber performs preliminary compression of the fluid before it enters the working chambers. This pre-compression action reduces the severity of pressure pulsations that occur during high-speed operation, thereby decreasing noise and vibration while maintaining high flow rate capability
Solution Approach 2:
The pre-compression chamber acts as an intermediary element between the inlet and the working chambers. It mediates the pressure fluctuations by providing a buffer volume that smooths out pressure pulsations, allowing the machine to operate quietly at high speeds
2Object-affected harmful factors
If pre-compression chamber is added to reduce pressure pulsations, then noise and vibration decrease, but device complexity increases
Solution Approach 1:
The pre-compression chamber is merged with the housing structure, forming an integrated design where the chamber is essentially a designated volume within the housing. This combining approach reduces the number of separate components and simplifies manufacturing while still achieving the pressure pulsation reduction effect
Solution Approach 2:
The housing structure serves multiple functions: it provides structural support, contains the working chambers, and incorporates the pre-compression chamber as an integral part. This multi-functionality reduces the need for additional separate components, thereby reducing overall device complexity
3Ease of manufacture
If constant displacement volume is used, then manufacturing is simplified, but adaptability to variable flow requirements decreases
Solution Approach 1:
While the displacement volume remains constant, the system achieves variable flow output through dynamic control of the motor speed. The constant geometric displacement combined with variable rotational speed provides both manufacturing simplicity and flow adaptability
Solution Approach 2:
The system maintains constant geometric parameters (displacement volume) for ease of manufacture, but achieves flow rate variability by changing the operational parameter of rotational speed. This separation of geometric constancy and operational variability resolves the contradiction between manufacturing simplicity and adaptability
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 design allows for quiet operation at high speeds with stable flow rates, is compact, cost-effective, and self-priming, reducing noise and vibration while maintaining efficient displacement.
Implementation Method 1
a pre-compression chamber (33) which is connected via a connecting channel (70) to a tapping opening (45)
Data Source
AI summary
An axial piston machine in a slanted axis design with constant displacement volume is disclosed. A tapping opening is arranged in the first reversing region, which can be brought into fluid exchange connection with one of the openings in each case by rotating the cylinder drum. The tapping opening is permanently connected to a pre-compression chamber via a connection channel, which runs completely in the housing. The pre-compression chamber is formed closed with the exception of the connection channel, wherein it is arranged completely in the housing.