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当前位置:首页 > 教学参考> 备课参考> 参考资料> 热学参考资料 > 内容详情

高压锅

作者:vip  人气: 3847 次  时间:2004年11月22日  星级:

世界上第一只高压锅是1681年由法国的丹尼斯·帕平( )发明的。高压锅的工作原理是利用了水的沸点随着压强的增大而升高的规律,提高烹饪过程中水的温度,达到特殊的烹饪效果。目前广泛使用的高压锅基本结构主要由锅体、锅盖和安全阀组成。高压锅锅体与其他种类的锅并无差异;锅盖则可以与锅体扣在一起,并采用橡皮密封圈保持锅内封闭;安全阀是高压锅正常工作的关键器件,它的质量较大且经过精确计算,置于锅盖上方的出气口上。在烹饪过程中,给锅体持续加热,由于锅体密封,锅内气体压强逐渐增大,使得锅内水的沸点比常压时要高;当温度升至一定值时,锅内水沸腾;同时,持续上升的锅内气体压强产生了足够把安全阀推起的力,阀门被抬起,锅内的水汽得以排出。此时锅内水温已高于外界环境中的水的沸点,在这样的高温下产生的烹饪效果与常压下大有不同。一般设计民用高压锅的安全阀开启压强值约为2个大气压,沸腾温度约120℃左右.

今天,我国的许多家庭都用上了高压锅,用这种锅做饭熟得快,很省时间。

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