Piston Pump Metering Unit with Ring Line Inlet
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Solution Overview
Problem
Existing piston pump metering devices have complex designs with long inlet and outlet lines, leading to medium cooling, chemical changes, and difficult cleaning, requiring multiple conveyor pumps and sensors, which result in measurement inaccuracies and quality issues.
Innovation Solution
A piston pump metering device with a ring line inlet line connected to a storage tank, allowing excess medium to flow back into the tank, reducing the need for multiple conveyor pumps and sensors, and enabling continuous medium monitoring through a single pressure sensor in the cylinder base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inlet and outlet lines are used for medium flow, then medium conveyance is achieved, but device complexity increases and standing medium causes cooling and chemical changes
Solution Approach 1:
The patent combines the inlet line and outlet line into a single ring line that circulates around the cylinder chamber. This single line serves dual purposes: supplying medium to the chamber and receiving excess medium back from the chamber, thereby eliminating the need for separate lines and reducing device complexity while preventing medium standing and quality degradation
Solution Approach 2:
The ring line performs multiple functions simultaneously: it acts as both an inlet line for medium supply and an outlet line for excess medium removal. The conveyor pump in the ring line continuously circulates medium, enabling the same line to handle both medium introduction and discharge operations
2Reliability
If long inlet lines are used to connect storage tank and cylinder, then medium can be conveyed, but medium cooling and chemical changes occur during standing time
Solution Approach 1:
By merging the inlet and outlet paths into a single ring line with continuous circulation, the patent eliminates long stationary inlet lines. The medium continuously flows through the ring line rather than standing in long conduits, preventing cooling and chemical changes while maintaining conveyance capability
Solution Approach 2:
The conveyor pump in the ring line ensures continuous medium circulation, preventing medium from standing still in long lines. This continuous motion maintains medium temperature and chemical stability while still allowing medium to be supplied to and discharged from the cylinder chamber as needed
3Ease of operation
If multiple conveyor pumps are used for inlet and outlet lines, then medium flow control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent employs a single conveyor pump in the ring line that performs both inlet and outlet functions. By continuously circulating medium through the ring line, this single pump replaces the need for separate inlet and outlet pumps, reducing device complexity while maintaining flow control capability through the unified circulation system
Solution Approach 2:
The patent merges the functions of multiple conveyor pumps into a single pump located in the ring line. This single pump handles both medium supply to and discharge from the cylinder chamber by maintaining continuous circulation in the ring line, thereby simplifying the system while preserving flow control
4Ease of manufacture
If inlet valve is situated far from cylinder chamber, then valve arrangement is simplified, but cleaning and flushing become difficult with residual liquid remaining
Solution Approach 1:
The patent extracts the inlet valve from its traditional distant position and relocates it directly into the cylinder base. This positioning allows the valve to be situated at the optimal location for cleaning and flushing operations, enabling complete line clearance while maintaining the simplicity of the valve arrangement through its integrated base mounting
5Difficulty of detecting and measuring
If multiple sensors are used for pressure monitoring, then measurement coverage is improved, but measurement precision decreases due to compensation errors
Solution Approach 1:
The patent merges multiple pressure sensing functions into a single pressure sensor located in the cylinder base. This single sensor monitors both inlet and outlet line pressures by being positioned where it can detect pressure variations during filling, taring, and volumetric determination operations, thereby eliminating compensation errors between multiple sensors while maintaining comprehensive pressure monitoring coverage
Data Source
AI summary
Method and device for metering a medium from at least one storage tank by a metering device, which has a piston pump, which defines a working chamber with a cylinder and a piston, wherein in a first method step a determined filling quantity of a medium is conveyed via an inlet valve into the working chamber and the determined filling quantity is greater than the quantity to be metered and, in a second method step, the piston reduces the working chamber in size enough that only the quantity to be metered remains, wherein the excess medium flows out of the working chamber, wherein the excess medium flows via the inlet valve back into a ring line, which is connected in a medium-conducting manner to the storage tank and is arranged outside the working chamber.