雨天是開車的朋友們最不喜歡的天氣，雨天行車不僅路滑，而且視線也不好，駕駛室內起霧是最讓人討厭的，駕駛室內中控臺上的循環按鈕可以解決這個問題，那么，下雨天到底是開外循環好還是內循環好呢？很多人可能都不知道吧，今天混凝土攪拌機小編就給大家介紹一下。

Rainy days are the least favorite weather for driving friends. Driving in rainy days is not only slippery, but also has poor vision. Fog in the cab is the most annoying. The cycle button on the center console in the cab can solve this problem. So, is it good to open the outer cycle or the inner cycle in rainy days? Many people may not know it. Today's small series of concrete mixer will introduce it to you.

攪拌車雨天行駛開內循環還是外循環？

Does the mixer drive in rainy days with internal circulation or external circulation?

下雨天氣天冷的話攪拌車的擋風玻璃上全是霧，嚴重影響司機的視線，所以最好先使用外循環風，將風向調整吹風檔，開外循環，可以把人呼出的蒸氣排出車外，而外面的冷空氣不容易凝結的。

In rainy weather and cold weather, the windshield of the mixer truck is full of fog, which seriously affects the driver's line of sight. Therefore, it is best to use the external circulation wind first, adjust the wind direction to the blowing gear, and turn on the external circulation, which can discharge the steam exhaled by people out of the car, while the cold air outside is not easy to condense.

一般在車窗關閉的情況下，內循環是在風機的作用下，車內的空氣循環，由于關閉了外界空氣進入的通道，外界的空氣進不來，空氣比較沉悶；外循環是車內空氣循環時，循環系統打開了外界空氣進入的通道，有外界空氣進來，空氣較為新鮮。常用的辦法：剛進入車內開空調或熱風時，為了使溫度迅速達到要求，開內循環；達到溫度要求后再開啟外循環模式，以使空氣新鮮舒適。家用車的密封性好，長期內循環對人體是有害的。

Generally, when the window is closed, the internal circulation is the air circulation in the vehicle under the action of the fan. Due to the closing of the access of the external air, the external air cannot enter, and the air is relatively dull; External circulation is the circulation of air inside the vehicle. When the circulation system opens the channel for external air to enter, there is external air coming in, and the air is relatively fresh. Common methods: when you just enter the car and turn on the air conditioner or hot air, in order to make the temperature meet the requirements quickly, turn on the internal circulation; After reaching the temperature requirements, turn on the external circulation mode to make the air fresh and comfortable. Household cars have good sealing performance, and long-term circulation is harmful to human body.

那么什么時候開外循環好什么時候開內循環好呢？

So when is it better to open the external circulation and when is it better to open the internal circulation?

1. 車外空氣質量差，污染嚴重的情況下（塵土飛揚的道路、擁堵的路段行車、化工廠附近等有臭味或者異味的路段）用內循環可以避免外面較差空氣進入車內。

1. When the air quality outside the vehicle is poor and the pollution is serious (dusty roads, congested road sections, road sections with odor or peculiar smell near the chemical plant, etc.), internal circulation can prevent the poor air outside from entering the vehicle.

2. 夏天駕駛攪拌車，為了使用空調快速降低車內溫度，可以使用內循環。

2. When driving a mixer truck in summer, in order to use air conditioning to quickly reduce the temperature in the truck, internal circulation can be used.

3. 攪拌車在冬天使用內循環可以讓車內更溫暖。

3. The internal circulation of the mixer truck in winter can make the car warmer.

4、雨天駕駛攪拌車可以定期的開啟外循環，使車內進入新鮮空氣。

4. Driving the mixer truck in rainy days can regularly turn on the external circulation to bring fresh air into the car.

賺錢很重要，安全更重要，各位攪拌車車友在雨天行車一定要注意安全！

Making money is very important, and safety is more important. You mixer drivers must pay attention to safety when driving in rainy days!