Hydraulic Return Line Suction and Boost Filter System
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Solution Overview
Problem
Conventional sludge pumps with hydraulic systems face challenges in maintaining optimal suction conditions and oil quantity management, leading to inefficiencies and increased tank volume and weight, particularly when operating consumers with differential cylinders.
Innovation Solution
The introduction of a secondary circuit with a motor-driven hydraulic secondary pump and a suction-return filter system, which includes a separate suction line and filter, a preload valve, and non-return valves, to manage excess oil and ensure optimal suction conditions, reducing tank volume and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction return filter system is used to maintain optimal suction conditions, then suction performance is improved, but excess oil quantity is required which increases tank volume
Solution Approach 1:
The hydraulic system is divided into two separate circuits: a primary circuit with the suction return filter and a secondary circuit with the auxiliary pump. This segmentation allows the primary circuit to maintain optimal suction conditions while the secondary circuit independently manages oil quantity compensation, eliminating the need for a large tank volume to hold excess oil.
Solution Approach 2:
The auxiliary pump acts as an intermediary device that compensates for oil quantity deficiencies in the primary circuit. It supplies additional oil to the suction return filter system when needed, allowing the tank volume to be reduced while maintaining the excess oil quantity required for optimal suction conditions.
2Adaptability or versatility
If consumers with differential cylinders operate, then functional versatility is improved, but significant oil undersupply occurs in the suction return filter system
Solution Approach 1:
The system incorporates a suction valve that responds to pressure conditions in the suction return filter system. When differential cylinder operation causes oil undersupply, the suction valve automatically opens to allow additional oil intake, providing feedback-based compensation that maintains oil quantity regardless of consumer type or operation mode.
3Device complexity
If the suction line communicates directly with the tank, then system simplicity is improved, but suction conditions deteriorate due to lack of excess oil
Solution Approach 1:
The suction return filter system is pre-charged with an excess quantity of oil from the tank before operation begins. The preload valve maintains this preliminary oil quantity in the system, ensuring optimal suction conditions are established in advance. This preliminary action allows the suction line to be connected to the filter rather than directly to the tank, improving reliability without excessive complexity.
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 configuration improves cold start behavior, reduces oil circulation, and minimizes tank size and weight, while protecting the suction-return filter from pressure differences and ensuring efficient operation of consumers with differential cylinders.
Implementation Method 1
The suction line (42) communicates with the outlet side (40'') of the suction-return filter (40), while the return lines (44, 46) communicate with the inlet side (40') of the suction-return filter (40)
Implementation Method 2
The excess oil remaining in the suction return filter system is routed to the tank via the preload valve (70)
Implementation Method 3
a suction valve (88) biased in the direction of the suction filter (66) is arranged in the suction line (86)
Implementation Method 4
two hydraulic drive cylinders (16, 16') each containing a drive piston (24, 24') which are each connected to the delivery pistons (22, 22') via a common piston rod (26, 26')
Data Source
AI summary
The invention relates to a hydraulic system, preferably for piloting and actuating a two-cylinder thick matter pump. The hydraulic system comprises a tank (68) for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer (AH, MH) which has at least one primary pump (36, 38, 61, 70), which is loaded with hydraulic oil via a first suction line (42), and is connected on the outlet side to at least one first return line, and which has a suction/return filter (40) which communicates with the first suction line (42) on the outlet side and is loaded on the inlet side with return oil from the at least one return line. A special feature of the invention consists in that the first suction line (42) communicates with the tank (68) via a separate replenishing suction line (86) and a suction filter (66), wherein a replenishing suction valve (88) which is preloaded in the direction of the suction filter (66) is arranged in the replenishing suction line (86).