Hydraulic Drive with Closed Circulation and Crane-Type Distributor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic drives with closed working fluid circulation systems face issues such as increased weight, volume, and complexity due to the presence of hydraulic tanks, leading to oxidation of working fluids, non-uniform motion, and reduced efficiency.
Innovation Solution
A hydraulic drive system with a hermetically sealed working fluid circulation system, featuring a hydraulic accumulator connected to an unregulated single-rotating pump and a three-position six-way crane-type hydraulic distributor, which includes a control lever and check valves, ensuring efficient fluid circulation and temperature control, reducing weight and volume while maintaining high precision and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic tank is used in the closed working fluid circulation system, then the system can store and supply working fluid, but the weight and volume of the device increase
Solution Approach 1:
The patent removes the hydraulic tank from the closed working fluid circulation system. Instead of using a tank to store and supply working fluid, the system relies on the hydraulic accumulator and the closed circulation between pump and motor to maintain continuous fluid flow, thereby eliminating unnecessary weight and volume while preserving circulation stability
Solution Approach 2:
The patent changes the system from an open tank-based circulation to a closed loop system with pressure regulation. The hydraulic accumulator maintains pressure within specific ranges (0.5-2.0 MPa during operation, 4.0-6.0 MPa during idle) to ensure continuous fluid circulation without requiring a tank, thus reducing weight while maintaining reliability
2Reliability
If a hydraulic tank is used in the closed working fluid circulation system, then the system can store and supply working fluid, but the volume of the device increases
Solution Approach 1:
The patent removes the hydraulic tank from the closed working fluid circulation system. Instead of using a tank to store and supply working fluid, the system relies on the hydraulic accumulator and the closed circulation between pump and motor to maintain continuous fluid flow, thereby eliminating unnecessary weight and volume while preserving circulation stability
Solution Approach 2:
The patent merges the functions of the hydraulic tank (fluid storage and pressure maintenance) into the hydraulic accumulator and the closed circulation system. The accumulator serves both as a pressure regulator and a fluid reservoir, while the closed loop between pump and motor ensures continuous circulation, combining multiple functions into fewer components to reduce overall device volume
3Reliability
If a hydraulic tank is used, then the system can maintain working fluid supply, but oxidation of working fluid occurs leading to tarry deposits and control assembly sticking
Solution Approach 1:
The patent implements a hermetically sealed closed circulation system that isolates the working fluid from atmospheric oxygen. The system maintains positive pressure (0.5-2.0 MPa during operation, 4.0-6.0 MPa during idle) to prevent air ingress, creating an inert environment that eliminates oxidation and tarry deposit formation while ensuring stable working fluid supply
Solution Approach 2:
The patent removes the hydraulic tank that exposed working fluid to air, and replaces it with a closed circulation system that prevents air contact. The hermetic sealing and pressure maintenance eliminate the source of oxidation, removing the harmful factor while preserving fluid supply stability
4Adaptability or versatility
If a complex hydraulic system design is used, then the system can provide multiple functions, but efficiency decreases and weight and volume increase
Solution Approach 1:
The patent makes the hydraulic accumulator serve multiple functions: pressure regulation during operation, air separation, and fluid storage during idle periods. The closed circulation system between pump and motor provides both continuous fluid supply and oxidation prevention. This multi-functionality reduces the need for separate components, improving efficiency while maintaining versatility
Solution Approach 2:
The patent merges the functions of the hydraulic tank (fluid storage and pressure maintenance) into the hydraulic accumulator and the closed circulation system. The accumulator serves both as a pressure regulator and a fluid reservoir, while the closed loop between pump and motor ensures continuous circulation, combining multiple functions into fewer components to reduce overall device volume
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
The system achieves a wide range of manufacturing and operating capabilities, high speed, positional accuracy, compactness, low weight, and high reliability, preventing condensate formation and cavitation, thus enhancing labor productivity and reducing maintenance costs.
Implementation Method 1
a hydraulic accumulator connected through a pipeline with an unregulated single-rotating hydraulic pump
Implementation Method 2
Between the pressure and drainage pipelines is connected a check valve
Implementation Method 3
an unregulated single-rotating hydraulic pump of with a drive motor
Implementation Method 4
a hydraulic distributor with an operating lever... When switching the control lever the holes, made in the cylindrical body, and the passages, made in the shaft, create alternately pressure and drainage flow passages
Data Source
AI summary
The invention relates to engineering hydraulics, in particular to hydraulic drives with closed working fluid circulation. The hydraulic drive contains a hydraulic accumulator connected with a drive motor. The hydraulic pump is connected through pressure and drainage pipelines to a hydraulic distributor connected through pressure-drainage pipelines to a double-acting hydraulic motor with piston and rods. Between the pressure and drainage pipelines is connected a check valve. The hydraulic flow distributor, is made crane-type, three-position, six-way, consisting of a cylindrical body closed on one side with a cover, the other side with a pressure washer, on the shaft is mounted a control lever. In the cylindrical body and the shaft are made in two levels create alternately pressure and drainage flow passages. The hydraulic drive has a wide range of manufacturing and operating capabilities, large capacity and speed, positional accuracy of the actuators, compactness, low weight and high reliability.