Cryogenic Piston Pump Hydraulic Balancing
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Solution Overview
Problem
Existing fuel delivery devices for cryogenic fuels, such as natural gas, face challenges in compensating for oscillating mass forces without using rotating components and shaft bearings, which are typically required to counteract these forces.
Innovation Solution
A piston pump design that hydraulically couples the pump piston to a balancing mass, allowing the movement of the pump piston to balance oscillating inertial forces without rotating components, using a hydraulic volume with separate partial volumes and a balancing mass that moves oppositely to the pump piston, and is prestressed mechanically or pneumatically to ensure reliable resetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rotating components are used to compensate oscillating mass forces, then force balance is improved, but device complexity increases due to shaft bearings and rotating parts
Solution Approach 1:
The patent replaces the traditional rotating mechanical balance system with a hydraulic coupling system. The pump piston is hydraulically connected to a balancing mass through a hydraulic medium, allowing force transmission without mechanical contact. This substitution eliminates shaft bearings and rotating components while achieving force balance through hydraulic pressure transmission.
Solution Approach 2:
The patent employs a hydraulic volume containing a hydraulic medium to couple the pump piston to the balancing mass. The hydraulic pressure generated by pump piston movement is transmitted to move the balancing mass in opposition, creating force balance. This hydraulic approach replaces complex mechanical rotating balance mechanisms.
2Stability of the object's composition
If a balancing mass is added to compensate oscillating forces, then force balance is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent merges the balancing function with the existing pump structure by integrating the balancing mass into the pump housing. The balancing mass is positioned within the same housing that contains the pump piston, and both elements share the hydraulic coupling system. This integration reduces the number of separate components compared to traditional external balance mechanisms.
Solution Approach 2:
The hydraulic volume serves multiple functions: it transmits hydraulic pressure from the pump piston, provides a coupling mechanism for the balancing mass, and enables force balance compensation. This multi-functionality reduces the need for separate balancing components and simplifies the overall device structure.
3Stability of the object's composition
If the balancing mass moves in opposition to the pump piston, then force balance is improved, but sealing requirements increase to prevent leakage
Solution Approach 1:
The hydraulic medium acts as an intermediary between the pump piston and the balancing mass, transmitting force through fluid pressure rather than direct mechanical contact. This intermediary approach allows for smoother force transmission and reduces the severity of sealing requirements compared to direct mechanical coupling, as hydraulic seals can accommodate minor movements and pressure variations.
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 effectively compensates for oscillating mass forces, enabling a compact and efficient fuel delivery system without the need for rotating components, achieving nearly complete balance of inertial forces and minimizing leakage through sealing mechanisms.
Implementation Method 1
The pump piston (2) is hydraulically coupled to the balancing mass (7) via a hydraulic volume (6), so that the movement of the pump piston (2) leads to a movement of the balancing mass (7)
Implementation Method 2
The balancing mass (7) is permanently subjected to gas pressure on its side facing away from the hydraulic volume (6)
Implementation Method 3
The pump piston (2) delimits a compression chamber (not shown) in which fuel can be compressed
Data Source
Figure 1
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AI summary
The invention relates to a fuel delivery device for cryogenic fuels, comprising a piston pump (1) for delivering the cryogenic fuel at a high pressure, said piston pump (1) having a pump piston (2) that can be moved back and forth and delimits a compression chamber at one end and a pressure chamber (5), which is formed in a hollow cylinder (4) and to which a hydraulic pressure medium can be supplied, at the other end. According to the invention, the pump piston (2) separates the pressure chamber (5) from a hydraulic volume (6) with a first sub-volume (6.1) which is formed within the hollow cylinder (4) and at least one additional sub-volume (6.2) which is formed outside of the hollow cylinder (4) and is delimited by a compensating mass (7) that can be moved back and forth.