Anechoic Chamber Nozzle Box With Pusher Cone Dislodgment
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Solution Overview
Problem
Existing fire suppression systems in anechoic chambers face challenges in accommodating higher boiling point fluorinated ketones, ensuring dislodgment of acoustic cones, avoiding contact of liquid agents with mounting box and chamber surfaces, and facilitating easy testing of operational readiness, while maintaining the integrity of the chamber's shield against electromagnetic interference.
Innovation Solution
A nozzle box unit with a pusher assembly that shifts between retracted and extended positions to dislodge acoustic material, allowing fire suppressing material to be discharged into the anechoic chamber, using pressurized fluid or mechanical energy to dislodge cones and ensuring a wide spray pattern without contact with chamber surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorinated ketones with high boiling points are used as fire suppressants, then environmental friendliness is improved, but the risk of liquid discharge and improper dispersion increases
Solution Approach 1:
The patent changes the physical state parameter of the fire suppressant by using high-boiling-point fluorinated ketones that can be stored as liquids but vaporize upon discharge. The system controls the temperature and pressure parameters to ensure proper phase transition from liquid storage to gas discharge, maintaining both environmental friendliness and reliable dispersion.
Solution Approach 2:
The patent replaces traditional mechanical spray mechanisms with a system that relies on pressure differential and phase change. The fire suppressant is discharged through nozzles using pressure from the storage container, allowing the liquid to atomize and vaporize in the air, eliminating the need for complex mechanical dispersion mechanisms.
2Reliability
If acoustic material is placed in front of the nozzle box, then chamber acoustic integrity is improved, but the force required to dislodge the material increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning the acoustic material in front of the nozzle box during installation. The material is held in place by friction and gravity before fire suppression is needed, ensuring acoustic integrity is maintained during normal operation. When fire suppression is activated, the stored potential energy in the positioned material allows for rapid dislodgment without requiring excessive force.
Solution Approach 2:
The patent uses the acoustic material itself as an intermediary between the nozzle box and the chamber environment. This material serves dual purposes: maintaining acoustic integrity when in place, and providing a controlled barrier that can be dislodged to allow suppressant discharge. The friction between the material and nozzle box acts as a controlled resistance that can be overcome by the pressure of the discharged suppressant.
3Adaptability or versatility
If mounting boxes are randomly placed in the protected space, then system adaptability is improved, but cone alignment precision deteriorates
Solution Approach 1:
The patent creates a universal mounting system where the nozzle box and acoustic material assembly can be installed in various positions throughout the protected space. The standardized interface and friction-based holding mechanism allow the same component design to function reliably regardless of installation location, providing both adaptability and consistent performance.
Solution Approach 2:
The patent applies local quality by allowing the acoustic material to be positioned slightly differently depending on the specific mounting location and surrounding geometry. Rather than requiring perfect alignment everywhere, the system accommodates local variations in installation conditions while maintaining sufficient coverage and acoustic integrity at each specific location.
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
Enables effective discharge of fire suppressing agents, maintains chamber integrity, and simplifies testing by ensuring consistent cone dislodgment, even with non-standard cone placements, while using environmentally friendly fluorinated ketones.
Implementation Method 1
the contact surfaces of the cone and surrounding cones were often lined with a low-friction material, such as FormicaTM, to reduce the friction forces holding the cone in place
Implementation Method 2
A selectively actuatable pusher assembly is provided that is shiftable between a retracted position and an extended position. The pusher assembly is configured to dislodge a piece of acoustic material mounted in front of the nozzle box open face upon shifting from the retracted position to the extended position
Implementation Method 3
These fluorinated ketones have a drawback in that they can have much higher boiling points than traditional halocarbon compounds. Therefore, the fluorinated ketones may be discharged from the nozzles in liquid form and then evaporate post-discharge.
Implementation Method 4
the fluorinated ketones may be discharged from the nozzles in liquid form and then evaporate post-discharge
Data Source
AI summary
A nozzle box unit forming a component of an anechoic chamber fire suppression system is provided. The nozzle box unit includes a pusher assembly that is configured to dislodge a piece of acoustic material positioned in front of the nozzle box so as to permit discharge of a fire suppressing material from a nozzle mounted inside the nozzle box unit into the anechoic chamber.