Silent oil-free vacuum pump company tells you the structure and operating instructions of oil-free vacuum pump
Basic overview
The oil-free vacuum pump is a rotary variable volume gas delivery pump. The oil-free vacuum pump can be used only with the cooperation of the front pump. It has a large pumping speed in a wide pressure range and is insensitive to the dust and steam contained in the extracted gas. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.
The development of oil-free vacuum pumps includes dry screw vacuum pumps, water ring pumps, reciprocating pumps, slide valve pumps, rotary vane pumps, roots pumps and diffusion pumps. These pumps are essential main pumps in the application of vacuum technology in various industries of our national economy. In recent years, with the sustained and high-speed development of China's economy, the downstream application industry related to vacuum pumps has maintained a rapid growth momentum. At the same time, driven by the continuous expansion of the application field of vacuum pumps and other factors, China's vacuum pump industry has achieved sustained and stable development.
In China's vacuum pump market, the entry and success of foreign enterprises have become an indisputable fact. Japanese vacuum stations are deployed everywhere, German LeiBao is expanded in China, and international manufacturers such as texel group of the United States and Youcheng of South Korea are also looking for partners to build manufacturing bases in China. They have a big appetite, which is likely to swallow the vacuum pump market. In recent years, although some domestic enterprises have gradually risen and occupied a relatively leading position in the vacuum pump market, most of them have poor R & D capabilities. Compared with their foreign counterparts, high-end products are still at a disadvantage in technology.
characteristic
(1) There is a large pumping speed in a wide pressure range;
(2) The rotor has good geometric symmetry, so the vibration is small and the operation is stable. There are gaps between rotors and between rotors and shells, so there is no need of lubrication, and the friction loss is small, which can greatly reduce the driving power, so as to achieve a higher speed;
(3) There is no need to seal and lubricate the pump chamber with oil, which can reduce the pollution of oil vapor to the vacuum system;
(4) There is no compression and exhaust valve in the pump chamber. Simple and compact structure, insensitive to dust and water vapor in the extracted gas;
(5) The compression ratio is low, and the pumping effect of hydrogen is poor;
(6) The rotor surface is a curved cylindrical surface with complex shape, which is difficult to process and inspect.
Structure
(1) Overall structure type of pump
The overall structure of the oil-free vacuum pump is determined by the layout structure of the pump body.
The intake and exhaust ports of the vertical structure are set horizontally, and it is convenient to assemble and connect pipelines. However, the center of gravity of the pump is high and its stability is poor when running at high speed, so this type is mostly used for small pumps.
The air inlet of the horizontal pump is at the top and the air outlet is at the bottom. Sometimes, for the convenience of installation and connection of vacuum system pipes, the exhaust port can be connected from the horizontal direction, that is, the inlet and exhaust directions are perpendicular to each other. At this time, the exhaust port can be opened from the left or right. In addition to connecting one end of the exhaust pipe, the other end is blocked or connected to the bypass valve. This kind of pump has low center of gravity and good stability when running at high speed. Generally, large and medium-sized pumps use this structure.
The two rotor shafts of the pump are installed vertically with the horizontal plane. The assembly clearance of this structure is easy to control, the rotor assembly is convenient, and the pump covers a small area. However, the center of gravity of the pump is high, the gear is inconvenient to disassemble and assemble, and the lubrication mechanism is relatively complex.
