Hollow Spool Switching Valve for Thermal Leakage Control
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Solution Overview
Problem
Existing thermal management circuits face issues with medium leakage from the gap between the spool and the case due to manufacturing tolerances, compromising the accuracy of temperature management.
Innovation Solution
A switching device with a hollow spool made of synthetic resin and a seal material between the spool and the case, featuring openings to reduce heat transfer and prevent medium leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spool is made of synthetic resin to reduce heat transfer, then the accuracy of managing the temperature of the medium is improved, but the medium may leak from the gap between the spool and case due to molding tolerance
Solution Approach 1:
A seal member is introduced as an intermediary component between the synthetic resin spool and the case. This seal member fills the gap caused by molding tolerances, preventing medium leakage while allowing the spool to remain made of synthetic resin for thermal insulation purposes.
Solution Approach 2:
The system uses a composite structure combining synthetic resin (for thermal insulation) and rubber material (for sealing). The seal member made of rubber compensates for the limitations of synthetic resin molding, creating a composite solution that achieves both thermal management accuracy and leakage prevention.
2Reliability
If the spool is made of metal to ensure sealing, then medium leakage is prevented, but heat transfer between the medium and spool increases, reducing temperature management accuracy
Solution Approach 1:
The seal member acts as a mediator that provides sealing functionality without requiring the spool itself to be made of metal. This allows the spool to remain thermally insulating while the seal member handles the sealing function.
Solution Approach 2:
The sealing function is segmented from the spool structure and implemented as a separate component. This segmentation allows each component to be optimized for its specific function: the spool for thermal insulation and the seal member for sealing.
3Reliability
If a seal material is added between the spool and case, then medium leakage is suppressed, but the device complexity increases
Solution Approach 1:
A flexible seal member made of rubber material is used to provide sealing. This simple flexible component effectively seals the gap between the spool and case without requiring complex sealing mechanisms or structures.
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
Ensures accurate temperature management with reduced heat transfer and suppresses medium leakage, maintaining thermal efficiency.
Implementation Method 1
it is desirable to reduce heat transfer between a medium and a spool, for example, in order to increase the accuracy of managing the temperature of the medium. Accordingly, it is conceivable to form the spool using a synthetic resin, for example.
Implementation Method 2
the seal material is provided between an outer circumferential surface of the hollow spool and the case
Data Source
AI summary
A switching device is a switching device that can be provided in a thermal management circuit and that can switch a flow path of a medium flowing through the thermal management circuit. The switching device includes at least one spool, a case, and a seal material. A part of the flow path is formed in the case. The at least one spool includes a hollow spool made of a synthetic resin and formed in a hollow shape. The hollow spool has at least one opening. The seal material is provided between an outer circumferential surface of the hollow spool and the case.