Load Pressure Passage Heating for Faster Variable Pump Response
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Solution Overview
Problem
Existing fluid pressure apparatuses face challenges in ensuring operational responsiveness due to insufficient warming of the working fluid in the signal pressure passage, leading to a difference in responsiveness between self and signal pressures, which can lower the capacity control of the pump.
Innovation Solution
A fluid pressure apparatus with a housing that includes a signal pressure passage guiding signal pressure to a variable displacement pump, featuring a pump passage, tank passage, and a communication passage adjacent to the signal pressure passage, separated by a wall portion, allowing warmed working fluid from the tank passage to transfer heat to the signal pressure passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal pressure passage is configured to limit working fluid flow, then pressure signal transmission is maintained, but operational responsiveness is reduced due to insufficient warming of the working fluid
Solution Approach 1:
The communication passage is configured to enable preliminary heating of the working fluid in the signal pressure passage during the warm-up operation phase. By establishing thermal coupling before normal operation begins, the system prepares the signal pressure passage to reach operational temperature simultaneously with the pump passage, eliminating cold-induced responsiveness delays before the system enters its normal operating state.
Solution Approach 2:
The patent changes the thermal parameter (temperature) of the working fluid in the signal pressure passage from a cold state to a warmed state through the communication passage during warm-up operation. This parameter change ensures that the viscosity and flow characteristics of the working fluid in the signal pressure passage match those in the pump passage, thereby equalizing operational responsiveness while maintaining the low flow rate necessary for reliable pressure signal transmission.
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 enhances the responsiveness of the pump's capacity control by warming the working fluid in the signal pressure passage, reducing temperature differences and improving operational efficiency.
Implementation Method 1
at least a potion of the communication passage is arranged adjacent to the signal pressure passage such that the potion is separated from the signal pressure passage only by a wall portion of the housing without any other passage guiding working fluid interposed between the potion and the signal pressure passage
Data Source
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AI summary
The valve device (100) includes the housing (10) provided with the load pressure passage (15) configured to guide the load pressure (Pls) to the variable displacement pump, the variable displacement pump being configured such that the discharge capacity is controlled in accordance with the self pressure (Pps) discharged by the variable displacement pump and the load pressure (Pls) supplied, wherein the housing (10) further includes: the pump passage (11) configured to guide the working oil sucked from the tank and discharged by the pump; the tank passage (12) configured to return the working oil discharged by the pump to the tank; and the communication passage (17) having both ends communicating with the tank passage (12), and wherein at least a potion of the communication passage (17) is arranged adjacent to the load pressure passage (15) such that the portion is separated from the load pressure passage (15) only by the wall portion of the housing (10) without any other passage guiding the working oil interposed between the portion and the load pressure passage (15).