Updraught Gas Water Heater Blower Layout for Low-Noise Combustion
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Solution Overview
Problem
Existing gas instantaneous water heaters produce significant noise due to the high rotating speed of blowers required to overcome resistance from air uniformizing boards, and existing updraught designs face challenges in accurately controlling blower speed and resisting high temperatures, limiting their application and efficiency.
Innovation Solution
A low-noise gas instantaneous water heater is designed with a stepless speed regulating direct current motor and thermal insulation to prevent motor control panel damage from high temperatures, combined with a master controller to accurately adjust blower speed based on combustion requirements, and features a heat exchanger and blower arrangement that avoids the need for air uniformizing boards, reducing noise and ensuring reliable combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a downward air-blasting blower with air uniformizing board is used, then air can be provided for combustion, but the tiny through holes generate large resistance causing high pressure difference and requiring high rotating speed which produces large noise
Solution Approach 1:
The patent inverts the conventional downward air-blasting structure to an updraught structure where the blower is positioned above the heat exchanger and pushes air upward through the combustion chamber. This reversal eliminates the need for air uniformizing boards with tiny through holes, thereby removing the source of high resistance and subsequent noise while still providing adequate combustion air
Solution Approach 2:
The patent removes the air uniformizing board component entirely from the system. By extracting this problematic component that created high resistance through its tiny through holes, the design eliminates the need for high blower speeds and the associated noise while maintaining combustion air supply functionality
2Object-affected harmful factors
If an updraught structure with blower above heat exchanger is used, then noise is reduced by avoiding air uniformizing board, but high temperature combustion flue gas damages the blower and motor control panel
Solution Approach 1:
The patent segments the blower assembly into thermally isolated zones using heat insulation plates and heat insulation cotton. The motor control panel is positioned in a protected zone away from the high-temperature flue gas path, while the impeller zone withstands the heat. This segmentation allows the updraught low-noise structure to function without thermal damage to sensitive components
Solution Approach 2:
The patent introduces heat insulation plates and heat insulation cotton as intermediary protective layers between the high-temperature flue gas and the motor control panel. These intermediary materials block heat transfer and protect the electronic components from thermal damage while allowing the flue gas to flow through the impeller zone
3Device complexity
If alternating current motor with limited speed settings is used, then simple structure is maintained, but accurate control of blower speed according to combustion requirements cannot be achieved
Solution Approach 1:
The patent replaces the static, fixed-speed alternating current motor with a dynamic direct current brushless motor that allows continuous speed adjustment. This dynamic motor can be precisely controlled to match varying combustion air requirements, improving operational flexibility and combustion efficiency while maintaining acceptable structural complexity through integrated 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
The solution significantly reduces noise levels by optimizing blower speed and airflow, improving combustion reliability and exhaust gas performance, while allowing for flexible operation and reduced noise during low-load conditions.
Implementation Method 1
at least one thermal insulation device is arranged between the motor control panel and the combustion flue gas generated by the combustion device
Implementation Method 2
a heat exchanger and a blower; wherein the combustion device, the heat exchanger and the blower are arranged such that a combustion flue gas is discharged after sequentially passing through the heat exchanger and the blower
Implementation Method 3
Gas passes sequentially through a gas proportional valve 5 and the combustion device 3, and is in combustion at the top of the combustion device 3
Data Source
AI summary
The invention relates to a low-noise gas instantaneous water heater, belonging to the technical field of gas appliances. The low-noise gas instantaneous water heater comprises a combustion device, a heat exchanger and a blower; wherein the combustion device, the heat exchanger and the blower are arranged such that a combustion flue gas is discharged after passing sequentially through the heat exchanger and the blower; the blower comprises a stepless speed regulating motor with a motor control panel and an impeller driven by the motor, and at least one thermal insulation device is arranged between the motor control panel and the combustion flue gas generated by the combustion device. The low-noise gas instantaneous water heater is capable of combining the advantages of an updraught structure and a stepless speed regulating blower, effectively solving the problem of loud noise in the operation process of the heater, and reaching the requirements of the constant temperature performance, exhaust gas indexes and reliability of the gas instantaneous water heater.