Capacitive Fluid Pump Sensor Eliminates Mechanical Wear
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Solution Overview
Problem
Conventional fluid pumps with electromechanical sensors face limitations due to moving components' limited lifespan, increased bulk, sensitivity to pollution, and reduced portability, necessitating an improved sensing mechanism for fluid flow and pressure monitoring.
Innovation Solution
A fluid pump utilizing a capacitance sensor with a monitoring chamber filled with gas, where fluid pressure displaces gas, allowing electronic determination of operational modes without mechanical components, combined with a current sensor for flow detection, enabling complete electronic control and reduced sensitivity to pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electromechanical sensors are used to detect operational parameters, then automatic operation mode is enabled, but moving components reduce reliability and increase bulk
Solution Approach 1:
The patent replaces electromechanical sensors with capacitive sensors that have no moving parts. The capacitive sensor uses electrical fields to detect fluid presence and pressure, eliminating mechanical components while maintaining automatic operation capability through electronic detection of operational parameters.
Solution Approach 2:
The patent introduces a diaphragm as an intermediary element that transmits fluid pressure to the capacitive sensor without direct mechanical contact between the fluid and the sensor electronics. This diaphragm allows pressure detection while maintaining isolation between the fluid environment and sensitive electronic components.
2Extent of automation
If electromechanical sensors are used to detect operational parameters, then automatic operation mode is enabled, but footprint increases reducing portability
Solution Approach 1:
The patent replaces bulky electromechanical sensors with compact capacitive sensors that use electrical field detection. This substitution dramatically reduces the sensor size and overall pump footprint while preserving automatic operation functionality through electronic parameter detection.
Solution Approach 2:
The patent integrates the capacitive sensor electrodes and monitoring chamber directly into the pump housing structure, nesting the sensing function within existing components. This integration eliminates separate sensor housings and reduces overall device volume.
3Difficulty of detecting and measuring
If electromechanical sensors are used to detect operational parameters, then sensing capability is provided, but sensitivity to pollution reduces usability
Solution Approach 1:
The patent uses a diaphragm as an intermediary that isolates the capacitive sensor from direct contact with the fluid. The diaphragm transmits pressure information while preventing debris, suspended particles, and other pollutants from reaching and damaging the sensor electronics, thereby eliminating sensitivity to pollution.
Solution Approach 2:
The patent replaces mechanical sensors that physically interact with fluid with capacitive sensors that detect pressure through electrical fields. This non-contact detection method eliminates sensitivity to fluid pollution while maintaining full sensing capability for operational parameter detection.
4Difficulty of detecting and measuring
If electromechanical sensors with moving components are used, then operational parameter detection is achieved, but working life is limited
Solution Approach 1:
The patent replaces electromechanical sensors with capacitive sensors that have no moving parts. Without mechanical components subject to wear, friction, and fatigue, the sensor achieves significantly extended working life and enhanced reliability for continuous operational parameter detection.
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 solution enhances reliability, reduces system cost and bulk, and improves usability by eliminating mechanical components, providing accurate operational mode recognition and real-time pressure indication, while allowing remote monitoring and improved frost warning capabilities.
Implementation Method 1
a capacitance sensor configured to generate a second signal indicative of capacitance between the pair of electrodes
Implementation Method 2
The dielectric has a first part made of an insulative material and a second part made of a fluid having a level that changes with respect to the insulative material which causes a change in the capacitance of the capacitor
Implementation Method 3
a diaphragm fluidly coupled to the fluid channel. The diaphragm is adapted to move within the monitoring chamber based on the fluid pressure within the diaphragm
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
A fluid pump (100) includes a fluid inlet (104), a fluid channel (108), a fluid outlet (106), a motor (114), a pair of electrodes (128), a capacitance sensor (124), and a current sensor (120). The fluid pump (100) is configured to monitor a first signal and a second signal. The fluid pump (100) is also configured to be controlled based on at least one of the first signal and the second signal. The capacitance sensor (124) includes a monitoring chamber (126) fluidly coupled to the fluid channel (108). The monitoring chamber (126) is at least partially filled with gas. The monitoring chamber (126) allows the gas to be at least partially displaced by the fluid flowing into the monitoring chamber (126) from the fluid channel (108) based on an operational mode of the fluid pump (100). The pair of electrodes (128) is associated with the monitoring chamber (126). The second signal between the pair of electrodes (128) is indicative of a fluid pressure within the fluid channel (108).