Rotary vane vacuum pumping speed
Rotary vane vacuum pump is an oil sealed mechanical vacuum pump. It belongs to the low vacuum pump. It can be used alone or as a front pump for other high vacuum pumps or ultra high vacuum pumps. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and pharmaceutical production and scientific research departments.
1. The rotary vane vacuum pump can start at an initial pressure of atmospheric pressure. After starting, with the increase of pumping time, the vacuum degree of the pumped vessel increases, and the actual pumping speed of the vacuum pump gradually decreases. When the limit is reached, the pumping speed of the vacuum pump is zero.
2. The actual pumping speed of the vacuum pump is less than the geometric pumping speed. In the process of pumping, the actual pumping speed (i.e. effective pumping speed) is decreasing. In addition to pipeline flow resistance, vacuum pump oil leakage and other factors, mainly due to the oil film gap of the return channel and oil vapor reflux, and the oil vapor reflux is the main reason for the drop in the pumping speed friend amplitude. Because of the serious internal friction of reflux, the increase of pumping speed under low pressure is limited.
SV Rotary Vane Vacuum Pump
3. Vacuum pump is lubricated and sealed by oil film. During operation, due to severe friction, local overheating of oil film will occur, resulting in the pyrolysis of vacuum pump oil, releasing oil vapor and unsaturated hydrocarbons. Therefore, the substances produced by the pyrolysis of vacuum pump oil are the main pollution sources.
4. The reflux of oil vapor is related to the vacuum of the pumped vessel, that is, the reflux rate is different with the change of pressure. When the vacuum pump is just started, the density of gas molecules is high and the relative velocity is high, so it is difficult for the oil vapor to diffuse back. In the range from start to pressure of 1 torch, due to the frequent collision of gas molecules in the dynamic vacuum system, this increases the resistance of oil vapor molecular reflux on the one hand, on the other hand, it can increase its removal ability under the sweep of space pumping air, so it can effectively prevent oil vapor reflux, so when the pressure P > 10-1 torch. The return rate of oil vapor is very small, and the loss of pumping speed is not large.
When the pressure is between 10-1 and 10-2, the air flow becomes a transient flow state, when the oil vapor begins to oppose diffusion. As the pressure decreases further, the gas becomes a molecular flow, and the reflux rate becomes higher and higher. Between 10-3 and 10-4 torrents, the reverse diffusion of oil vapor molecules reaches the maximum, and the pumping speed decreases faster.
Technical parameters:
| Model | Pump speed (m3/h) | Motor Power (KW) | Inlet Diam (inch) | Rotary speed (rpm) | Oil Capacity (L) | G.W (kg) | Noise dB (A) | Dimensions (mm) | |
| 50HZ | 60HZ | ||||||||
| SV-010 | 10 | 12 | 0.37 (3ph) 0.55 (1ph) | G1/2 | 1400 | 0.5 | 20 | 64 | 405*253*210 |
| SV-020 | 20 | 24 | 0.75 (3ph) 0.90 (1ph) | G1/2 | 2800 | 0.5 | 20 | 64 | 405*253*210 |
| SV-025 | 25 | 30 | 0.75 (3ph) 0.90 (1ph) | G1/2 | 2800 | 0.5 | 22 | 64 | 405*253*210 |
| SV-040 | 40 | 48 | 1.5 (3ph) 2.2 (1ph) | G11/4 | 1400 | 1.0 | 50 | 67 | 660*300*270 |
| SV-063 | 63 | 75 | 2.2 | G11/4 | 1400 | 2.0 | 83 | 68 | 695*420*295 |
| SV-100 | 100 | 120 | 3.0 | G11/4 | 1400 | 2.0 | 87 | 72 | 735*420*295 |
| SV-160 | 160 | 192 | 4.0 | G2 | 1400 | 4.5 | 152 | 74 | 805*520*410 |
| SV-200 | 200 | 240 | 5.5 | G2 | 1400 | 4.5 | 159 | 76 | 825*520*410 |
| SV-250 | 250 | 300 | 7.5 | G2 | 1400 | 7.0 | 230 | 76 | 1000*550*410 |
| SV-300 | 300 | 360 | 7.5 | G2 | 1400 | 7.0 | 236 | 76 | 1200*550*410 |
| SV-630 | 630 | 750 | 15.0 | DN100 | 960 | 35 | 620 | 75 | 1630*1300*980 |
| SV-750 | 750 | 900 | 18.5 | DN100 | 1150 | 35 | 640 | 76 | 1630*1300*980 |
Rotary vane pump is one of the most basic vacuum equipment in vacuum technology. Rotary vane pumps are mostly small and medium sized pumps. Rotary pump has two kinds: single stage and double stage. The so-called two-stage structure is to connect two single stage pumps in series. It is usually made in two stages to achieve higher vacuum.
Lifting speed of rotary vane vacuum pump:
The pumping speed of rotary vane vacuum pump under low pressure (P < 10 – 3) is one of the main indexes to evaluate the performance and quality of the vacuum pump. In order to improve the pumping speed, one of the effective ways is to reduce the return flow of oil vapor.
1. Considering the structure, molecular sieve, active alumina and other adsorption traps can be used to capture the oil vapor of vacuum pump effectively. The rotary vane vacuum pump can also be combined with various adsorption vacuum pumps for pre-pumping, which can prevent the reverse diffusion of oil vapor.
2. To improve the quality of vacuum pump oil, the main requirements for vacuum pump oil are: low steam pressure at high temperature, good pyrolysis resistance under severe mechanical friction.
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