Electronic Valve With Translating Diaphragm for Compact Wrist Monitors
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Solution Overview
Problem
Conventional electronic valves used in sphygmomanometers are limited by the size of the rod-shaped movable iron core, which increases the longitudinal dimension, making it difficult to miniaturize the device for wrist-worn blood pressure monitoring.
Innovation Solution
An electronic valve design featuring a yoke, a solenoid coil, a disk-shaped diaphragm, and a coil spring, where the diaphragm moves translationally to open and close the valve, reducing the size by using a plate-shaped magnetic material and an elastic body to control fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rod-shaped movable iron core is used in the electronic valve, then the valve can be opened and closed reliably, but the longitudinal dimension of the valve increases
Solution Approach 1:
The movable iron core is changed from a rod shape (longitudinal movement) to a disk shape (translational movement in a different dimension). This dimensional change allows the valve to achieve the same opening/closing function while reducing the longitudinal dimension, enabling miniaturization for wrist-worn devices.
Solution Approach 2:
The shape parameter of the movable iron core is changed from rod-shaped to disk-shaped. This parameter change fundamentally alters the movement direction and reduces the longitudinal dimension while maintaining the valve's opening and closing functionality through translational movement of the disk.
2Volume of moving object
If the electronic valve is miniaturized for wrist-worn use, then it can be always attached like a wristwatch, but the reliability of valve operation may be compromised
Solution Approach 1:
By changing the movement dimension from longitudinal to translational, the valve achieves compact size suitable for wrist-worn applications while the disk shape and associated mechanisms ensure reliable operation is maintained despite the reduced scale.
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 design allows for a compact electronic valve that can be formed in small size, maintaining reliable operation and stability even when the posture changes, suitable for wrist-worn sphygmomanometers.
Implementation Method 1
the movable iron core is moved in the coil bobbin against the biasing force of the spring by the magnetic force generated by the solenoid coil
Implementation Method 2
a coil spring that biases the diaphragm in a direction away from the one end portion of the pole piece
Data Source
AI summary
An electronic valve with: a yoke including an end plate portion and a side plate portion; a pole piece; a solenoid coil; and a diaphragm made of a plate-shaped magnetic material. The pole piece has an opening at one end portion and a first fluid inlet/outlet communicating with the opening at the other end portion. A biasing unit biases the diaphragm in a direction away from one end portion of the pole piece in a manner of moving the diaphragm translationally in one direction. In a non-operating time, the electronic valve comes into an open state where the opening is open. In an operating time, the diaphragm approaches the one end portion of the pole piece against the biasing force of the biasing unit by a magnetic force generated by the solenoid coil, and the electronic valve can come into a closed state where the opening is closed.