Two-Cylinder Piston Pump Mode Switching via Internal Bridge Channels
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Solution Overview
Problem
Existing two-cylinder piston pumps face challenges with complex and impractical mode switching due to high pressure losses, sealing issues, and increased installation effort caused by numerous hydraulic connections, which complicates operation and safety in construction sites.
Innovation Solution
A hydraulically driven two-cylinder piston pump with a switching device that connects piston-side chambers directly to the switching device via passage channels, reducing the need for hydraulic oil lines and using adapter flanges and expansion sleeves for secure attachment, allowing for efficient mode switching without modifying the switching device for differential cylinders of varying diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If numerous hydraulic lines and connection points are used for mode switching, then the pump can switch between piston-side and rod-side operation, but leakage problems occur and pressure losses increase
Solution Approach 1:
The patent integrates the switching device directly into the differential cylinder structure, merging the switching function with the existing hydraulic chambers. This eliminates the need for separate hydraulic lines and external connection points, thereby reducing leakage risks while maintaining mode switching capability between piston-side and rod-side operation
Solution Approach 2:
The patent introduces a bridge oil line as an intermediary element that connects the rod-side chambers of both differential cylinders internally. This bridge oil line serves as a controlled intermediary pathway for hydraulic oil flow, enabling mode switching without requiring external hydraulic lines and multiple connection points that would increase leakage risk
2Adaptability or versatility
If numerous hydraulic lines and system components are used for mode switching, then the pump can switch between operating modes, but pressure losses increase
Solution Approach 1:
The switching device is merged with the differential cylinder structure, eliminating multiple separate hydraulic lines and components. This integration reduces the number of connection points and flow path interruptions, thereby minimizing pressure losses during mode switching while maintaining the ability to switch between piston-side and rod-side operation
Solution Approach 2:
The bridge oil line provides a continuous internal pathway for hydraulic oil flow between the rod-side chambers of both differential cylinders. This continuous flow path eliminates interruptions and pressure losses associated with external hydraulic lines, valves, and connection points, enabling smooth mode switching with minimal energy loss
3Adaptability or versatility
If many hydraulic lines are required for mode switching, then the pump can switch between piston-side and rod-side operation, but assembly and cost effort increase
Solution Approach 1:
The switching device is integrated directly into the differential cylinder structure, merging multiple functions into a single component assembly. This eliminates the need for assembling numerous separate hydraulic lines, connection points, and external switching components, thereby significantly reducing assembly effort and manufacturing complexity while maintaining mode switching capability
Solution Approach 2:
The differential cylinder structure is designed to serve multiple functions: it acts as both the hydraulic actuator and the switching device housing. The bridge oil line simultaneously serves as both a hydraulic connection and a mode switching mechanism. This multi-functionality reduces the number of separate components that need to be manufactured and assembled, lowering overall assembly effort and cost
4Adaptability or versatility
If hydraulic hoses are extensively used for mode switching, then the pump can switch between operating modes, but the risk of leaks and damage increases
Solution Approach 1:
The switching device is merged with the differential cylinder structure, eliminating the need for extensive external hydraulic hoses and connection points. This integration reduces the exposed hydraulic components that are susceptible to leaks and damage, while maintaining the ability to switch between piston-side and rod-side operation through internal flow paths
Solution Approach 2:
The bridge oil line serves as an internal intermediary pathway that eliminates the need for external hydraulic hoses connecting the rod-side chambers of both differential cylinders. This internal intermediary pathway is protected within the cylinder structure, reducing the risk of leaks and damage compared to extensive external hose connections
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 the risk of damage and leaks, simplifies assembly, and ensures secure operation by minimizing hydraulic hose requirements and enhancing the mechanical strength of connections, enabling safe and efficient switching between piston and rod-side modes.
Implementation Method 1
the hydraulic oil for driving the differential cylinders 22, 23 of the two-cylinder piston pump 1 is directed to the drive piston 8 of a differential cylinder 22 via a control circuit (not shown)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a hydraulically driven two-cylinder piston pump (1), comprising a first differential cylinder (22), which has a piston-side chamber (51) and a rod-side chamber (53) and drives a first conveying piston (4) by means of a first piston rod (6), a second differential cylinder (23), which has a piston-side chamber (52) and a rod-side chamber (54) and which drives a second conveying piston (5) by means of a second piston rod (7), and a switch-over device (14), which sets a piston- or rod-side operating mode of the two-cylinder piston pump (1) by switching over the flow of hydraulic fluid to the chambers (51, 52, 53, 54) of the differential cylinders (22, 23), wherein the switch-over device (14) is arranged on the bottoms (48, 49) of the piston-side chambers (51, 52) of the differential cylinders (22, 23) as a bridge-forming connection between the differential cylinders (22, 23). The invention is characterized in that the switch-over device (14) comprises passage channels (28, 29) for the hydraulic fluid for driving the differential cylinders (22, 23), by means of which passage channels the piston-side chambers (51, 52) of the differential cylinders (22, 23) are connected to the switch-over device (14) without hydraulic-fluid lines. The invention further relates to a method for operating a hydraulically driven two-cylinder piston pump according to the invention.