Mixed-Fluid Delivery Reflux Path for Piezoelectric Pump Cooling
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Solution Overview
Problem
Piezoelectric pumps in mixed-fluid delivery devices overheat due to heat generation, leading to operational issues.
Innovation Solution
A mixed-fluid delivery device with a reflux path that contacts the piezoelectric pump's housing chamber, cooling it through residual liquid flow, and a nozzle portion disposed on the pump cabinet's side surface, with a flow path forming body forming part of the reflux path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a piezoelectric pump is used to generate compressed air, then the device can deliver mixed fluid effectively, but the piezoelectric pump temperature rises due to heat generation
Solution Approach 1:
The patent utilizes the residual liquid that would otherwise be waste and returns it through a reflux path that contacts the pump cabinet, converting the harmful heat into beneficial cooling effect. The residual liquid absorbs heat from the piezoelectric pump during reflux, thereby cooling the pump while also preventing operational failures.
Solution Approach 2:
The reflux path acts as an intermediary between the mixing portion and the pump cabinet. It provides a thermal coupling medium (residual liquid) that transfers heat from the piezoelectric pump to the liquid, enabling indirect cooling without direct contact between the pump and external cooling systems.
2Duration of action of moving object
If the piezoelectric pump operates continuously, then mixed fluid delivery is maintained, but operational failures occur when temperature becomes high
Solution Approach 1:
The system performs preliminary cooling action by establishing a reflux path that continuously returns residual liquid to cool the pump cabinet. This preventive cooling mechanism operates continuously to maintain pump temperature within safe operating limits, preventing thermal runaway and operational failures before they occur.
Solution Approach 2:
The reflux path creates a feedback loop where residual liquid is continuously circulated back through the pump cabinet. This self-regulating system automatically removes heat generated during operation, maintaining thermal balance and ensuring reliable continuous operation without external temperature monitoring or control.
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
Effectively cools the piezoelectric pump, preventing abnormal operation due to heat, and ensuring consistent device performance.
Implementation Method 1
the reflux path is provided so as to be in contact with at least a part of the pump cabinet
Data Source
AI summary
A mixed-fluid delivery device includes a piezoelectric pump that includes a piezoelectric vibrator having a piezoelectric element and a vibrating plate and a pump cabinet and discharges a fluid, and a case body including a pump housing chamber, a liquid reservoir portion, a mixing portion that generates a mixed fluid, a nozzle portion through which the gas discharged from the piezoelectric pump is ejected to the mixing portion, and a conducting portion that conducts a liquid toward the mixing portion. The case body has a reflux path through which a residual liquid that remains in the mixing portion without being delivered to the outside is returned to the liquid reservoir portion. The reflux path is provided so as to be in contact with at least a portion of the pump cabinet.