Ejector Muffler Segmentation for Noise Reduction
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Solution Overview
Problem
Conventional ejectors generate excessive exhaust noise while maintaining the vacuum degree and intake flow rate of negative-pressure air, limiting the effectiveness of noise reduction methods due to the inherent design of the exhaust flow channel and silencing mechanisms.
Innovation Solution
The ejector design incorporates a muffler with a cylindrical silencing member and an exhaust opening that directs axial airflow to the outside, while diffusing noise-generating airflow radially outward, maintaining the vacuum degree and intake flow rate by optimizing the nozzle and exhaust opening diameters and silencing member length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a silencing member composed of porous material is disposed at the exhaust opening to apply ventilation resistance to exhaust air, then exhaust noise is reduced, but the vacuum degree and intake flow rate of negative-pressure air are reduced
Solution Approach 1:
The exhaust flow channel is segmented into multiple regions: a noise reduction chamber with silencing members for noise attenuation, and a separate exhaust opening for maintaining airflow. This segmentation allows the silencing function and flow maintenance function to operate independently, resolving the contradiction between noise reduction and intake flow rate
Solution Approach 2:
Different regions of the exhaust flow channel are given different properties: the noise reduction chamber contains porous silencing members for noise absorption, while the exhaust opening maintains open geometry for optimal airflow. This local differentiation allows each region to perform its specific function without compromising the other
2Object-affected harmful factors
If the ventilation resistance of the exhaust flow channel is increased by disposing the silencing member at the exhaust opening, then exhaust noise is reduced, but the vacuum degree of negative-pressure air is reduced
Solution Approach 1:
The exhaust flow channel is divided into a noise reduction chamber with high resistance (silencing members) and an exhaust opening with low resistance. This segmentation allows noise reduction without compromising the vacuum degree, as the main exhaust flow path remains open
Solution Approach 2:
The noise reduction chamber acts as an intermediary element between the exhaust flow and the external environment. It provides noise attenuation while the separate exhaust opening maintains the vacuum pressure by allowing free exhaust flow
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 exhaust noise while ensuring the necessary vacuum degree and intake flow rate for attracting small electronic components, improving noise performance without compromising the operational efficiency of the ejector.
Implementation Method 1
a negative-pressure region is formed around a distal-end portion of the nozzle. If a suction port is open in this negative-pressure region, the negative pressure is generated at the suction port because of the viscosity of air.
Implementation Method 2
a diffuser coaxially aligned with the nozzle... a diffuser arranged on a downstream side of the nozzle in the ejector housing hole, the diffuser being formed with an ejecting port for discharging air ejected from the nozzle
Implementation Method 3
an ejector provided with a muffler for reducing exhaust noise from the ejecting port... a muffler main body having a cylindrical portion covering the ejecting port... a cylindrical silencing member arranged in the cylindrical portion
Data Source
AI summary
An ejector (20), which built in an ejector housing hole (18), comprises: a nozzle (21) for diffusing and ejecting compressed air from an air supply port (23); and a diffuser (22) formed with an ejection port (29) for discharging air ejected from the nozzle (21) and air flowing in from a suction port (30). A muffler main body (42) attached to an ejector block (11) is formed with a silencing chamber (43), and a distal-end wall portion (42b) of the muffler main body (42) is formed with an exhaust port (48) facing the ejection port (29). It is possible to achieve the silencing effect while ensuring the vacuum degree of negative-pressure air and the intake flow rate by discharging air from the exhaust port (48).