Axial Piston Pump Pressure Reducing Valve Startup Control
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Solution Overview
Problem
Axial piston pumps experience significant volume losses and mechanical stress due to high throttling losses when starting up with maximum delivery volume, leading to inefficiency and structural complexity in pressure-limiting valves.
Innovation Solution
Implementing a pressure-reducing valve that sets the multi-way valve to a switching position immediately, reducing pressure to 30 bar, and using a control pilot pressure generated from this reduced pressure to adjust the axial piston pump, minimizing volume losses and mechanical stress, while incorporating a proportional pressure-limiting valve for electrical power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the axial piston pump starts up with maximum delivery volume, then the pump can immediately supply maximum flow, but significant volume losses and mechanical stress occur due to high throttling losses
Solution Approach 1:
The pump is pre-adjusted to a reduced delivery volume setting before startup. The angle lever is positioned such that the multi-way valve is pre-configured to limit the delivery volume to a value between 0% and 50% of maximum, preventing excessive flow and throttling losses during startup while still providing sufficient flow for most operating conditions
Solution Approach 2:
The delivery volume parameter is changed from maximum to a reduced value (0%-50% of maximum) before startup. This parameter adjustment is achieved by positioning the angle lever to pre-set the main stage valve, thereby changing the pump's operating characteristics to match typical load requirements and avoid energy waste
2Adaptability or versatility
If a pressure-limiting valve is designed to cope with maximum delivery volume and maximum pressure, then it can handle all operating conditions, but it becomes structurally complex and expensive
Solution Approach 1:
The pressure-limiting valve is pre-adjusted to a reduced pressure setting (30-70 bar) before operation. The angle lever mechanism pre-positions the valve to limit the maximum pressure to this reduced value, which is sufficient for most operating conditions. This preliminary adjustment simplifies the valve structure and reduces cost while maintaining adaptability through the ability to adjust the pressure limit
Solution Approach 2:
The pressure limit of the valve is made dynamically adjustable through the angle lever mechanism. By rotating the angle lever, the user can dynamically change the pressure limit setting, allowing the valve to adapt to different operating conditions. This dynamic adjustment capability replaces the need for a complex, over-engineered fixed high-pressure valve
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 solution reduces volume losses, minimizes mechanical stress on hydraulic media, and enhances efficiency by providing precise control behavior with reduced mechanical complexity and cost, especially at lower pressures.
Implementation Method 1
a pressure-reducing valve (17) which is connected to the main line (8) and sets a reduced pressure in a line (18) to the multi-way valve (14), for example about 30 bar
Implementation Method 2
The control pilot pressure adjusts the main stage together with the control pressure tapped from the main line at the pressure pilot
Implementation Method 3
an angle lever (10) actuates a solenoid-operated multi-way valve (14). The angle lever is acted upon in a pivoting direction about a fixed axis by an adjustable spring and against the spring on a second arm via a feeler piston
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In an axial piston pump (1) with different actuating piston areas (3, 6), an N-regulator with a pressure-piloted multi-way multi-position main stage (22, 22', 22") controlled by the delivery pressure against a first spring force (24), and an L-regulator with a multi-way valve (14) adjustable via an angle lever (10) against a second spring force (15), wherein a stop (11) movable relative to it and a sensing piston (13) acted upon by the delivery pressure are attached to the angle lever (10), and the delivery side of the axial piston pump (1) is connected via a main line (8) to the pressure pilot (23) and an inlet of the main stage (22, 22', 22") as well as to the sensing piston (13), a pressure reducing valve (17) is connected to the main line (8), with which a reduced control pressure can be set for the multi-way valve (14), from which the multi-way valve (14) generates additional control pilot pressure for the main stage (22, 22', 22").