Zhongchuang negative pressure suction system is specially designed by Zhongchuang Company for hospital departments, dental chairs in clinics or places that require negative suction. Intelligent control fault automatic protection, suction efficient cleaning. Even a 5-for-1 or 10-for-10 suction machine is a small piece of equipment. It is unmatched by traditional dry suction machines. The suction is continuous and stable, and the intensity is adjustable within the range. In order to protect the indoor environment, it is of great help to prevent cross infection. The water cup vacuum pump is also called a water ring pump. Because it also has the function of a compressor, it is also often called a water ring compressor. However, its pressure range is relatively small, only 1︿2×105Pa gauge pressure, so it is a low-pressure compressor. The gas compression in the water ring vacuum pump is isothermal, so it can be used to pump out flammable and explosive gases. Therefore, water ring vacuum pumps are widely used in many industrial sectors such as petroleum, chemical industry, machinery, mining, light industry, medicine and food.