High temperature in two-stage rotary vane vacuum pump?

1、 Why does the two-stage rotary vane vacuum pump have high temperature
1. High motor power and high working current lead to high temperature of vacuum pump.
2. The number of fan blades is small, resulting in less air. The fan speed is low, and the air pressure and air volume are small.
3. The bus voltage of the vacuum pump motor is 380V. Due to the uneven cable voltage drop and load distribution, the actual voltage applied by the motor is only 365 v. the low voltage leads to large operating current.
4. The motor is attached with dust and oil, which reduces the heat dissipation capacity, resulting in high temperature of the vacuum pump.

2、 Two-stage rotary vane vacuum pump of high temperature solution
The motor power and speed match the vacuum pump and cannot be changed. The fan is mounted on the main shaft of the motor. The speed of the motor determines the speed of the fan and cannot be replaced. Although increasing the number of fan blades can play a certain role, when the number of blades increases, the dynamic balance is not easy to find. If the alignment is not good, the vibration of the motor will increase.
1. Extend the fan cover of the original two-stage rotary vane vacuum pump by 40cm, and install an axial fan with the same diameter as the fan cover inside. The motor power of axial flow fan is 850 W, the speed is 1489 R / min, the voltage is 380 V, and the original fan remains unchanged. The axial fan is controlled by another power supply and is not interlocked with the main motor. After the vacuum pump is started, the axial fan shall be started in time, and the axial fan shall be shut down 30 minutes after the vacuum pump is shut down to fully cool the main motor.
2. Dust the vacuum pump motor regularly, keep the motor heat sink clean and increase its heat dissipation capacity.
3. Adjust the bus voltage where the vacuum pump is located to 400V
As we all know, vacuum pump oil plays a very important role in rotary vane vacuum pump, especially 2x rotary vane vacuum pump. Its performance is closely related to vacuum pump oil, especially the limit vacuum pressure and service life of vacuum pump. Vacuum pump oil is not only used as the medium to obtain vacuum, but also plays the role of lubricating, cooling and sealing the friction point of vacuum pump.

3、 Two-stage rotary vane vacuum pump oil of main properties
1. Very low steam pressure. This is the most important performance of vacuum pump oil. Because the rotary vane vacuum pump requires high vacuum, paraffin based narrow fraction lubricating oil is generally used.
2. Good thermal oxidation stability. Vacuum pump is developing at a high speed. Due to the high-speed friction between the sliding plate and the pump body, the oil temperature rises and the oil is easy to oxidize and decompose. In particular, the diffusion pump usually works in a very high temperature environment, which increases the steam pressure in the system and reduces the vacuum. Therefore, vacuum pump oil needs to have good thermal oxidation stability.
3. Proper viscosity and good viscosity temperature characteristics. The internal volume of the vacuum pump chamber changes constantly to form the exhaust effect, which requires the lubricating oil to have appropriate viscosity and viscosity temperature characteristics.