Roots Vacuum Pump Systems 2

  
Roots pump is a kind of vacuum pump without internal compression, usually the compression ratio is very low, so the high, the vacuum pump needs the front pump.
Pump cavity by a pair of leaf rotor synchronous, reverse rotation of the push and pressure action to move the gas and realize the vacuum pump pumping.
Roots vacuum pump is a mechanical vacuum pump with a pair of synchronous high speed rotating sole shaped rotor, this pump can not be pumped separately, the front stage needs to be equipped with oil seal, water ring, etc., can be directly discharged into the atmosphere. Its structure and working principle are similar to roots blower, and its suction port is connected with the vacuum container or the main pumping pump of the vacuum system. The vacuum pump between the rotor and rotor, rotor and pump shell do not contact each other, the gap is generally 0.1 ~ 0.8 mm; No oil lubrication is required. Rotor profiles include arc, involute and cycloid. Involute rotor pump volume utilization rate is high, the processing accuracy is easy to ensure, so the rotor profile more involute type. Roots vacuum pump speed up to 3450 ~ 4100 RPM; The pumping rate is 30-10000 l/s (1 l = 10-3.3 m); Ultimate vacuum: 6.5×10-2 pa for single stage and 1×10-3 pa for double stage.
The ultimate vacuum of roots pump depends on the structure and manufacturing accuracy of the pump itself, but also depends on the ultimate vacuum of the front pump. In order to improve the ultimate vacuum of the pump, roots pump can be used in series. Roots pump works on a similar principle to roots blower. Due to the continuous rotation of the rotor, the gas is drawn from the air inlet into the space between the rotor and the pump shell V0, and then discharged through the exhaust port. Since the v0 space is completely closed after suction, there is no compression or expansion of the gas in the pump cavity. But when the top of the rotor turned the edge of the exhaust port, V0 space and the exhaust side are connected, because the exhaust side gas pressure is higher, there is a part of the gas back to the space V0, so that the gas pressure suddenly increased. As the rotor continues to rotate, the gas is discharged from the pump. Roots pump in the pump cavity, there are two "8" shape of the rotor vertically installed in a pair of parallel shafts, driven by a pair of gear ratio of 1 reverse synchronous rotation movement. There is a certain gap between the rotor and the inner wall of the pump shell, which can achieve high speed operation
Roots vacuum pump is characterized by: quick start, less power consumption, low operation and maintenance costs, pumping speed, high efficiency, to be pumped gas contained in a small amount of steam and dust is not sensitive, in the range of 100 ~ 1 pa pressure has a large pumping rate, can quickly exclude the sudden release of gas. This pressure range is just between the oil seal mechanical vacuum pump and the diffusion pump. Therefore, it is often connected in series between the diffusion pump and the oil seal mechanical vacuum pump to improve the pumping capacity in the middle pressure range. At this time it is also known as mechanical booster pump.
Roots vacuum pump is widely used in smelting, degassing, rolling in vacuum metallurgy, and vacuum distillation, vacuum concentration and vacuum drying in chemical, food and pharmaceutical industries. Vacuum pump accessories for vacuum pump noise control, vacuum pump muffler.
Roots pump working principle performance characteristics and essentially the same CAM pump, but the rotor is roots type. It can transport liquids with a viscosity of tens of thousands of centipores. Roots pump is mainly there are two rotor in the opposite direction of rotation in the pump body, driven by a pair of synchronous gear, for the rotor of roots pump, in the pump body is meshing with each other, but there is a gap. The size of the clearance mainly depends on the viscosity of the liquid. Beyond a certain viscosity range, the clearance must be adjusted to increase.
1, roots pump often check the oil position, does not meet the requirements must be adjusted to meet the requirements. Roots pump operation, oil level to the oil standard center prevail.
2, roots pump oil change period according to the actual use conditions and can meet the performance requirements, etc., at the discretion of the user. General New Roots pump, remove clean and dry gas, recommended in the work of 100 hours or so oil change once. After the black metal powder can not be seen in the oil, the oil change period can be appropriately extended.
3, roots pump often check the oil quality, found that oil deterioration should be replaced in time with new oil, paults pump is working normally.
4. In general, roots pump should be repaired after working for 2000 hours to check the aging degree of jujube seals, check whether the exhaust valve slice is cracked, and clean up the dirt deposited on the valve slice and exhaust valve seat. Clean all parts in roots pump cavity, such as rotor, vane, spring, etc. It is usually cleaned with gasoline and dried. After cleaning the rubber parts, dry them with a dry cloth. Cleaning and assembly should be handled gently to be careful of bruising.
5. Roots pump adds bearing lubricating oil to the bearing body, and the oil level should be observed at the center line of the oil mark. The lubricating oil should be replaced or supplemented in time.
6, roots pump check roots pump pipeline and joint for loosening phenomenon. Turn roots pump by hand to see if roots pump is flexible.
7, roots pump should be reassembled after trial operation, generally empty operation for 2 hours and oil change two times, because when cleaning in roots pump will leave a certain amount of volatile matter, to be normal operation, and then put into normal work.
8, roots pump motor, when the roots pump normal operation, open the outlet pressure gauge and import roots pump, as it shows the appropriate pressure, gradually open the gate valve, and check the motor load.
9, roots pump as far as possible to control the flow and head of roots pump in the range indicated on the sign, to ensure that roots pump at the highest efficiency point of operation, in order to obtain the maximum energy saving effect.