Please use this identifier to cite or link to this item: `http://hdl.handle.net/11455/1736`
 標題: 比例閥參數對高負荷熱水器之影響分析The Effects of Proportional Valve Parameters On High-Load Water Heater 作者: 郭原裕Kuo, Yuan Yu 關鍵字: Proportional Valve;比例閥;High-Load Water Heater;secondary pressure;高負荷熱水器;二次壓 出版社: 機械工程學系 摘要: 本文主要研究比例閥參數對高負荷熱水器之影響分析。所使用燃氣為天然 氣。比例閥參數本文所採用為﹕穩壓彈簧係數、瓦斯噴嘴孔徑。本文以穩 壓彈簧係數和瓦斯噴嘴孔徑為操控變數，配合各種一次壓、燃氣入熱量、 號數及比例閥控制電流，來實驗分析高負荷熱水器之二次壓的變化情形。 由二次壓的變化情形，可研判高負荷熱水器之燃燒穩定性能。本文所研究 之高負荷熱水器為一新型之機種，與傳統型熱水器相較，具有高號數、高 熱效率、高安全性、低污染性等優點。由本實驗結果顯示﹕當穩壓彈簧係 數等於5.7g/mm時，雖然號數增加至19號仍會造成二次壓無法達到穩壓而 導致高負荷熱水器燃燒不完全、浮火、黃端焰等現象產生。所以不適宜使 用此值之穩壓彈簧於高負荷熱水器之比例閥中，適宜選用的穩壓彈簧係數 為Ks=4.8g/mm或Ks=4g/mm。又由改變噴嘴孔徑實驗結果顯示﹕在相同入熱 量及穩壓彈簧係數下，噴嘴孔徑由φ1.6mm增加至φ1.8mm時，則比例閥出 口壓力(即二次壓)會降低，其中以噴嘴孔徑為φ1.7mm時，其二次壓穩壓 最好。綜合本實驗結果得知﹕在16號機種之高負荷熱水器中，其穩壓彈簧 係數以Ks=4g/mm，配合噴嘴孔徑φ1.7mm時，所得比例閥出口二次壓穩壓 最好。亦即，以Ks=4g/mm，φ1.7mm搭配在高負荷熱水器時其燃燒性能最 佳。The purpose of this thesis is to investigate the performance of high-load water heater with proportional valve parameters. The fuels of Natural Gas is used in this experiment.The parameters of proportional valve include spring constant,nozzle orifice diameter.The controlling variable of this experiment are spring constant and nozzle orifice diameter.The effect of secondary pressure on high-load water heater with various first pressure, input heat of fuel,degree and control current are investigated. From the variations of secondary pressure,we can find a suitable parameters of proportional valve with stable burning for high- load water heater with a better performance. The high-load water heater presented in this thesis is a new type and have the advantage of the high degree,high efficiency,high safety and low air-pollution.From the results show that the secondary pressure of high-load water heater is still unstable,although the degree is increased to 19,when the spring constant is 5.7 g/mm.The phenamena of unstability flame leads to Incomplete Combustion, Lifting Flame,Yellow Tip of high-load water heater.Therefore the spring constant of 5.7 g/mm is not suitable for high-load water heater in Proportional valve.The most proper spring constant of Proportional valve is 4.4 g/mm or 4 g/mm.The results show that the output pressure of proportional valve(secondary pressure) will decrease with nozzle orifice diameter (from φ=1.6mm to φ=1.8mm)increases when the values of input heat of fuel and spring constant are thesame.Therefore,the optimum of nozzle orifice diameter in this experiment is φ=1.7mm.To sum up,the results of this experiment show that the secondar pressure performance of high-load water heater with degree of 16 is the best when the spring constant are Ks=4 g/mm andφ=1.7mm. Therefore, the optimum design of high-load water heater for proportional valve is Ks=4 g/mm andφ=1.7mm . URI: http://hdl.handle.net/11455/1736 Appears in Collections: 機械工程學系所

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