Hydrostatic Pump Suction Valve Pressure Actuation
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Solution Overview
Problem
Existing valve arrangements in hydrostatic pumps face issues with reliable opening of suction valves, leading to potential jamming and damage when the first suction valve sticks, especially when the rotational direction of the pump is reversed, as the pressure medium cannot be replenished effectively.
Innovation Solution
The valve arrangement loads the first suction valve in the opening direction with the pressure of the second pump connection, and optionally the second suction valve with the pressure of the first pump connection, using the generated high pressure to overcome sticking and open the suction valve without mechanical connection between the two suction valves, ensuring reliable hydraulic opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first suction valve is opened only by vacuum, then the valve arrangement is simple, but the suction valve may stick and fail to open reliably
Solution Approach 1:
The patent applies preliminary action by using the high pressure from the second pump connection to pre-load the first suction valve in the opening direction before the pump actually delivers pressure medium to the suction side. This ensures the valve is already positioned to open reliably when needed, preventing sticking issues that would occur with vacuum-only actuation.
Solution Approach 2:
The patent introduces an intermediary mechanism by channeling high pressure from the second pump connection through a connecting channel to act on the first suction valve. This intermediary pressure path ensures reliable valve opening without requiring direct mechanical connection between the two suction valves, solving the reliability problem while maintaining system simplicity.
2Reliability
If the two suction valves are mechanically connected, then one valve can be opened reliably, but jamming of the connecting rod or valve bodies can occur
Solution Approach 1:
The patent replaces the mechanical connection system with a hydraulic pressure transmission system. Instead of mechanically connecting the two suction valves with a connecting rod, the invention uses high pressure from the second pump connection transmitted through a connecting channel to act on the first suction valve. This substitution eliminates mechanical jamming risks while maintaining reliable valve opening.
Solution Approach 2:
The patent introduces an intermediary pressure transmission channel that connects the second pump connection to the first suction valve. This intermediary hydraulic path replaces the need for direct mechanical connection between valves, allowing force transmission without physical contact between moving parts, thereby preventing jamming while ensuring reliable operation.
3Reliability
If mechanical connection between suction valves is used, then reliable opening is achieved, but the device complexity and installation space increase
Solution Approach 1:
The patent applies universality by making the high pressure from the second pump connection serve multiple functions: it both drives the pump operation and simultaneously acts as the actuating force for the first suction valve. This multi-functionality eliminates the need for separate mechanical connection mechanisms, reducing device complexity while maintaining reliability.
Solution Approach 2:
The patent implements self-service by having the pump's own high pressure output automatically serve to open the suction valve. The system uses its own operational pressure to actuate the valve without requiring external mechanical connections or additional actuating mechanisms, simplifying the overall device structure while ensuring reliable valve opening.
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 ensures reliable opening of suction valves, reduces mechanical components and installation space, and increases the flow cross-section, preventing jamming and maintaining pump functionality across rotational direction changes.
Implementation Method 1
The valve arrangement loads the first suction valve in the opening direction with the pressure of the second pump connection
Data Source
AI summary
A valve arrangement is configured to rectify a volumetric flow supplied by a hydraulic pump to a first pump connection or second pump connection. The valve arrangement includes a first suction valve arranged between a suction-side connection of the valve arrangement and the first pump connection. The valve arrangement also includes a second suction valve arranged between the suction-side connection and the second pump connection. The valve arrangement also includes a first pressure valve arranged between a pumping-side connection of the valve arrangement and the second pump connection. The valve arrangement also includes a second pressure valve arranged between the pump-side connection and the first pump connection. The first suction valve is acted on by the pressure of the second pump connection in the opening direction. The second suction valve is acted on by the pressure of the first pump connection in the opening direction.