Flattened Pressure Controller With Insulating Filter
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Solution Overview
Problem
Existing cuff pressure control devices face challenges in maintaining safe surface temperatures due to heat transmission from pumps, especially when housing thickness is reduced, leading to potential low-temperature burns.
Innovation Solution
A pressure controller with a flattened housing, a pump disposed such that its discharge port is in the thickness direction, and a low thermal conductivity member with elasticity and permeability positioned between the pump and the housing to inhibit heat transfer, along with a filter to remove dust and stabilize the pump's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing thickness is reduced to achieve size reduction, then the device becomes more compact, but the heat from the pump is more easily transmitted to the housing, causing surface temperature to exceed the predetermined temperature
Solution Approach 1:
A heat insulating member is introduced as an intermediary component between the pump (heating element) and the housing. This member has thermal conductivity of 0.05 W/m·K or less, which effectively blocks heat transmission from the pump to the housing, allowing the housing to be thinned without causing excessive surface temperature.
2Length of stationary object
If the housing is thinned to reduce size, then the device is more compact, but the distance between the housing and the pump is decreased, making heat transmission more severe
Solution Approach 1:
The heat insulating member serves as a mediator that maintains effective thermal isolation between the pump and housing even when the housing is thinned. The member's low thermal conductivity (0.05 W/m·K or less) ensures that heat transmission remains suppressed regardless of the reduced distance.
Solution Approach 2:
The heat insulating member is designed as a thin film or shell structure that can be placed between the pump and housing without adding significant thickness. This thin-film approach allows the housing to remain thin while still providing effective thermal insulation.
3Volume of moving object
If the pump is fixed in the main surface direction to enable thin housing design, then the device achieves size reduction, but the heat generated by the pump is transmitted to the housing, causing low-temperature burn
Solution Approach 1:
The heat insulating member is positioned between the pump and housing to block heat transmission. This intermediary component allows the pump to be fixed in the main surface direction for compact design while preventing heat from reaching the housing surface, thus avoiding low-temperature burn.
Solution Approach 2:
The heat insulating member converts the harmful heat generated by the pump into a manageable factor by blocking its transmission path. The member's low thermal conductivity transforms the potential harm (heat causing burn) into a beneficial thermal isolation, allowing close proximity between pump and housing without temperature transfer.
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 effectively reduces heat transmission to the housing, preventing surface temperature rises and ensuring safe operation while allowing for a thinner design.
Implementation Method 1
a low thermal conductivity member disposed at a side opposite to the discharge port and between the pump and an inner surface of the housing
Implementation Method 2
having elasticity
Implementation Method 3
having permeability
Implementation Method 4
along with a filter to remove dust and stabilize the pump's position
Data Source
AI summary
A pressure controller 1 supplies fluid to a cuff and controls an internal pressure of the cuff. The pressure controller 1 has a housing 10 having a flattened shape. In the housing 10, a pump 31 having a discharge port 33 through which the fluid is discharged and which is directed in a thickness direction of the housing 10, and a control module 20 which controls the pump 31 such that the internal pressure of the cuff falls within a predetermined range, are disposed. A filter 39 which has elasticity and has lower thermal conductivity than the housing 10 is disposed at a side opposite to the discharge port 33 and between the pump 31 and an inner surface of the housing 10.