寒冷地带使用的汽车,冬季驾驶室内很冷,前窗玻璃结霜很厚,影响驾驶员的视野。而且,驾驶员手脚易冻坏,这就严重地影响了行驶的安全性。因此,很需要有可靠的暖风装置。目前,我国生产的汽车,只有少数车型装暧风装置。根据1977年的调查,全国为主机厂配套生产暖风装置的工厂约有十一家,总产量一万台左右,普遍存在质量问题。由于三化程度 The cars used in the cold areas are cold in the winter driving cabin and frost in the front glass is very thick, affecting the driver’s field of vision. Moreover, the driver’s hands and feet easy to freeze, which severely affected the safety of driving. Therefore, there is a need for a reliable heater. At present, there are only a few models of vehicles equipped with warm air in our country. According to a survey conducted in 1977, there were about 11 factories producing complete sets of warm air for the main engine factories in the country, with a total output of about 10,000 units and widespread quality problems. Due to three levels