claw vacuum pump performance introduction

Compared with oil sealed mechanical pump, the compression ratio of general oil-free dry pump is smaller. In order to overcome the high pressure difference and exhaust directly to the atmosphere, a large amount of particulate matter needs to be removed. Therefore, it is very important to select an effective air extraction mechanism. Claw type vacuum pump has high volumetric efficiency and internal compression, and the rotor can tell non-contact operation. It is a better pumping mechanism to realize dry pumping, but it also needs multi-stage series connection to reach the required limit pressure.

In addition to compressing gas, claw rotor also has the valve function of opening and closing by itself, that is, periodically opening and closing the inlet and outlet of pump chamber. High compression ratio and high volumetric efficiency can be achieved due to internal compression and valve action. In the case of low power consumption, there is a higher pumping speed. The type of gas to be pumped has little effect on the compression ratio. The clearance between the rotor and the pump body is large, and the small particles are easy to be removed. This kind of dry-type pump has been produced in China.

The EVP vacuum pump manufacturer takes the four-stage pump with full claw rotor as an example

The main shaft of the claw type vacuum pump is vertically installed, and the air flow can flow from the top to the bottom, which is conducive to the discharge of particulate matter and liquid. Except for the first stage, the pumping volume of each stage is equal. Due to the different flow state of the backflow in the clearance of each stage, the reverse flow situation of each stage is different, and the compression ratio of each stage is also different. In the middle of the exhaust port at all levels, the use of removable pipes in these parts, with a quick connector connection, do not need to dismantle the whole pump can be cleaned. The bearings and seals are cooled with water and air in the middle part. In this way, the temperature difference between the rotor and the pump body is small. The surface in contact with the extracted medium is resistant to corrosion. The rotor is turned by motor and gear, and there is lubrication at the bearing and gear. A special piston ring sealing device is selected to prevent the leakage of lubricating oil steam into the pump cavity. The four levels are of layered structure, convenient for maintenance and high positioning accuracy.

The claw type vacuum pump has a special monitoring system, such as pump temperature, pressure, flow, etc. are controlled by sensors. In order to operate safely, the pump inlet and outlet are equipped with filter screen, dust collector and muffler. The whole pump can be loaded in a hood to inhale air to prevent the leakage of the extracted gas. The pump is easy to move with four small rollers.