Silencing Device with Side Branches and Heater
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Solution Overview
Problem
Existing silencing devices for air flow noise caused by supercharging devices, such as turbochargers, often reduce engine power performance by increasing pressure loss due to the use of resonance tubes or silencers.
Innovation Solution
A silencing device comprising an intake air pipe with multiple side branches acting as interference silencers and a heat exchanger to heat the intake air, which reduces air flow noise while minimizing pressure loss by decreasing friction loss through increased air temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If resonance tubes or silencers are provided in the air intake duct to reduce turbo air flow noise, then air flow noise is reduced, but pressure loss of the intake air increases and engine power performance is reduced
Solution Approach 1:
The patent changes the physical parameters of the air flow by heating the intake air before it enters the turbocharger. By increasing the air temperature, the air density decreases, which reduces the friction loss and pressure drop across the silencers. This allows the silencers to remain effective at noise reduction while minimizing their negative impact on engine power performance.
Solution Approach 2:
The heater is positioned upstream of the silencers in the air intake duct, performing the heating action before the air reaches the noise-reducing components. This preliminary heating prepares the air in advance, ensuring that when the air passes through the silencers, the pressure loss is already minimized due to the reduced density from heating.
2Object-affected harmful factors
If multiple resonance tubes are mounted in the air intake duct to reduce intake air noise, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The heater serves multiple functions: it preheats the intake air to reduce pressure loss, and simultaneously modifies the air temperature to optimize the acoustic performance of the silencers. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity despite the presence of multiple resonance tubes.
3Volume of stationary object
If the air intake duct is extended and curved to accommodate silencers in limited space, then silencers can be mounted without reducing operability of oil filler cap, but pressure loss increases due to longer duct length
Solution Approach 1:
By heating the air in the extended duct section before it reaches the silencers, the air density is reduced. This parameter change compensates for the additional pressure loss that would normally result from the longer and curved duct path, allowing the duct to be extended into the available space without proportionally increasing the overall pressure loss.
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 device effectively silences air flow noise across multiple frequency bands without degrading engine power performance by using side branches to cancel sound waves and heating the intake air to lower air density, thereby reducing friction and pressure losses.
Implementation Method 1
The heater is disposed in the intake air pipe, and configured to heat the intake air introduced through the intake air pipe
Implementation Method 2
multiple side branches acting as interference silencers... side branches to cancel sound waves
Data Source
AI summary
A silencing device includes an intake air pipe, a silencer, and a heater. The intake air pipe communicates with a supercharging device configured to supercharge intake air to be sucked into an engine. The intake air pipe is configured to introduce the intake air into the supercharging device. The silencer is disposed in the intake air pipe, and configured to silence air flow noise. The heater is disposed in the intake air pipe, and configured to heat the intake air introduced through the intake air pipe.