Ejector, fuel cell system equipped with ejector and refrigeration cycle system equipped with ejector
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Solution Overview
Problem
Conventional ejector structures in fuel cell and refrigeration cycle systems suffer from reduced suction efficiency and energy efficiency due to the diffusion of the driving fluid jet from the interior nozzle affecting the exterior nozzle's flow, leading to decreased energy efficiency.
Innovation Solution
The improved ejector design features an interior nozzle with its outlet positioned upstream of the exterior nozzle along the axial direction, preventing interference between the driving fluid jets and allowing the driving fluid jet from the exterior nozzle to be focused axially, thereby increasing suction force and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the outlet part of the interior nozzle is arranged at the downstream side more than the outlet part of the exterior nozzle, then the structure allows the fluid jet to easily diffuse toward the outer peripheral side, but this reduces suction efficiency and energy efficiency
Solution Approach 1:
The patent inverts the conventional nozzle arrangement by positioning the interior nozzle outlet upstream of the exterior nozzle outlet along the axial direction. This reversal prevents the interior nozzle jet from interfering with the exterior nozzle jet, allowing the exterior nozzle to efficiently suck the suction fluid without diffusion losses.
2Device complexity
If the interior nozzle outlet projects forward more than the exterior nozzle outlet, then the structure is simplified, but the driving fluid jet from the interior nozzle affects the correct flow from the exterior nozzle, reducing suction force
Solution Approach 1:
The patent introduces an intermediary spatial relationship between the two nozzles by positioning the interior nozzle outlet upstream of the exterior nozzle outlet. This spatial arrangement acts as an intermediary that allows both nozzles to function independently without their jets interfering with each other, preserving the suction force generated by the exterior nozzle.
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 enhances energy efficiency by ensuring the driving fluid jet from the exterior nozzle is not diffused, resulting in increased suction force and improved energy efficiency within the ejector.
Implementation Method 1
The interior nozzle receives a driving fluid and ejects a driving fluid jet. The exterior nozzle also receives the driving fluid, and ejects the driving fluid jet.
Implementation Method 2
The suction part sucks a suction fluid by using a force of the driving fluid jet ejected from the interior nozzle and/or the exterior nozzle.
Implementation Method 3
The diffuser part reduces a flow speed of the mixture fluid composed of the driving fluid jet and the suction fluid, and ejects the mixture fluid.
Data Source
AI summary
An ejector has an interior nozzle, an exterior nozzle, a suction part, a mixing part and a diffuser part. The interior nozzle and the exterior nozzle are arranged coaxially with each other. A driving fluid is supplied to the interior nozzle and/or the exterior nozzle. The suction part is arranged on an outer periphery of the exterior nozzle and sucks a suction fluid by a driving fluid jet ejected from the interior nozzle and/or the exterior nozzle. A mixing part mixes the driving fluid jet with the suction fluid, and supplies a mixture fluid. The diffuser part reduces a flow speed of the mixture fluid and ejects the mixture fluid outside. An outlet part of the interior nozzle is arranged at an upstream side of the ejector more than an outlet part of the exterior nozzle along the axial direction of the ejector.