Hydraulic Valve Spool Heating Using Slippage Flow Friction
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Solution Overview
Problem
Existing valve spool heating methods in hydraulic systems require continuous energy input, leading to energy losses and delayed heating, which can result in jamming, especially under cold conditions due to indirect heating via an oil channel.
Innovation Solution
A valve design where the pressure supply port is partially disconnected from the utility port, utilizing a heat-emitting connection to create a slippage flow that heats the valve spool directly, with a barrier device generating frictional heat for efficient heating, reducing the need for continuous flow and energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a constant oil flow is maintained through the valve housing to heat the valve spool indirectly, then the valve spool is heated uniformly, but continuous pump output is required which consumes energy and causes energy losses
Solution Approach 1:
The valve spool heating is achieved through self-service by utilizing the slippage flow that naturally occurs during valve operation. The barrier device converts this slippage into frictional heat directly at the valve spool, eliminating the need for external energy input or continuous pump operation for heating purposes.
Solution Approach 2:
The invention converts the harmful slippage flow, which is typically considered a loss or waste in hydraulic systems, into a beneficial heat source. The barrier device generates frictional heat from the slippage flow, which directly heats the valve spool and prevents jamming, thereby transforming a negative effect into a useful function.
2Temperature
If indirect heating via the valve housing is used, then energy transfer occurs from the valve housing to the valve spool, but energy losses increase the energy input required and heating takes time
Solution Approach 1:
The invention extracts the heating function from the indirect valve housing heating process and places it directly at the valve spool. The barrier device is positioned to generate frictional heat directly on or near the valve spool surface, eliminating the intermediate heat transfer step through the valve housing and achieving rapid, direct heating.
3Stability of the object's composition
If a constant oil flow is maintained for heating, then uniform heating of the valve housing is ensured, but the system requires continuous pump output and cannot stop flow when pressure supply is ensured
Solution Approach 1:
The heating action becomes periodic and operation-dependent rather than continuous. The barrier device generates heat during valve operation when slippage flow occurs, and the heating ceases when the valve is in its working position with pressure supplied to the hydraulic consumer. This periodic heating maintains uniform temperature during operation while improving overall system efficiency.
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 valve spool is quickly and efficiently heated, preventing jamming under cold conditions with low pump output, as frictional heat from the barrier device effectively transfers heat, ensuring reliable operation without continuous heating medium flow.
Implementation Method 1
the barrier device serves as a fluid resistance and transfers heat generated by friction to the fluid entering and/or exiting the valve spool
Implementation Method 2
the slippage, which is preferably heated via a barrier device that serves as a fluid resistance, transfers heat directly due to friction to the ingoing and/or outgoing fluid in the valve spool
Implementation Method 3
The heat-emitting connection in the valve spool opens into the pressure supply port and/or into the return port... transfers heat generated by friction to the fluid entering and/or exiting the valve spool
Data Source
AI summary
A valve includes a valve housing (2) for transport of a heatable fluid such as hydraulic oil. The valve housing has at least one utility connection (A, B), at least one pressure supply connection (P), and at least one return connection (T1, T2). A control slide (6) is guided in the valve housing (2) in a longitudinally displaceable manner. In at least one position of the control slide (6), the pressure supply connection (P) is at least partially separated from the utility connection (A, B), and the heatable fluid arrives, proceeding from this pressure supply connection (P) and via a heat-emitting connection in the control slide (6), at the at least one return connection (TI, T2) as a loss volume flow. The loss volume flow serves as a heat source and heats at least regions of the control slide (6).