A Wholesale Molecular Pump includes a pump body, including: a main pump body and two pump shells. The two pump shells are respectively symmetrically fixed on the upper and lower sides of the main pump body, and each pump shell is provided with a pump port , Respectively, the air inlet and the air outlet, the upper part of the main pump body is provided with an upper motor base mounting part; the upper motor base is fixed to the upper motor base mounting part;
The main shaft is a mirror-symmetrical structure, from top to bottom including: a moving impeller mounting part, a safety bearing contact part, and a motor rotor mounting part. The central axis of the main shaft is collinear with the center line of the pump body; up and down The safety bearing, the main shaft is rotatably arranged in the pump body through the cooperation of the safety bearing contact part with the upper and lower safety bearings; the upper and lower safety bearing seats, the upper safety bearing seats are fixed to the upper motor seat, and the lower safety bearing seats Fixed to the bottom of the main pump body; upper and lower moving impellers are arranged in the pump body and are respectively fixedly connected to the moving impeller mounting parts at both ends of the main shaft to form a shafting rotor with the main shaft, wherein the moving impeller The axis of the impeller is collinear with the central axis of the main shaft; the upper and lower stationary blade groups respectively include multiple-layer stationary blades arranged alternately with the upper and lower moving impellers;

The motor includes upper and lower motor stators and upper and lower motor rotors. The motor rotor is fixedly sleeved on the motor rotor mounting part of the main shaft and is arranged in linkage with the shafting rotor. The upper and lower motor stator sleeves On the outside of the motor rotor. Further, the moving impeller includes a main body and a multi-layer moving blade, the multi-layer moving blades are arranged in sequence along the axial direction on the outer circumference of the body, and the number of layers of the moving blades corresponds to the number of layers of the stationary blades, and the moving blades are The stationary blades are alternately arranged along the axial direction; further, the moving blades are made of titanium alloy material. Further, the Wholesale Molecular Pump further includes upper and lower positioning ring groups, which are respectively arranged on the inner sidewalls of the upper and lower pump casings, and include multiple positioning rings, the number of layers of the positioning ring corresponds to the number of layers of the stator blades , Each positioning ring has a positioning groove for accommodating the stationary blade, and the groove depth is the same as the thickness of the stationary blade.