Driving structure of three-axis multi-stage roots pump

A three-axis multi-stage Roots pump comprising:

• a pump body (1), wherein a first side of the pump body (1) is mounted with an air inlet end gear mechanical seal driving unit (2);
• a gear end cover (3) mounted on an outer surface of the air inlet end gear mechanical seal driving unit (2), the gear end cover (3) being fixedly mounted on a side end surface of the pump body (1);
• a motor connecting base (4) fixedly mounted on an outer surface of the gear end cover (3);
• an air outlet end moving bearing air sealing unit (5) mounted on a second side of the pump body (1) opposite said first side of the pump body (1);
• a bearing end cover (6) mounted on an outer surface of the air outlet end moving bearing air sealing unit (5), wherein the bearing end cover (6) is fixedly mounted on a side end surface of the pump body (1);
• wherein the pump body (1) is further provided with a driving axis (7), a first driven axis (8) and a second driven axis (9);
• wherein the first driven axis (8) and the second driven axis (9) are located on opposite sides of the driving axis (7), respectively;
• wherein outer surfaces of the driving axis (7), the first driven axis (8) and the second driven axis (9) are each fixedly mounted with a respective gear (10), the gear (10) on the outer surface of the driving axis (7) meshes with the gear (10) on the outer surface of the first driven axis (8), and the gear (10) on the outer surface of the second driven axis (9), respectively;
• wherein a first end of the driving axis (7), a first end of the first driven axis (8), and first end of the second driven axis (9) are each movably connected to the air inlet end gear mechanical seal driving unit (2);
• wherein a second end of the driving axis (7) opposite the first end of the driving axis (7), a second end of the first driven axis (8) opposite the first end of the first driven axis (8), and a second end of the second driven axis (9) opposite the first end of the second drive axis are each movably connected to the air outlet end moving bearing air sealing unit (5);
• and wherein the moving bearing air sealing unit (5) comprises:
• a dust shielding base (27);
• a dust shielding bushing (28);
• a bearing gland (29);
• and
• a bearing base (30);
• wherein the dust shielding base (27) is fixedly mounted on the bearing end cover (6) and cooperates with the dust shielding bushing (28);
• wherein the dust shielding bushing (28) is sleeved on the driving axis (7), the first driven axis (8), and the second driven axis (9), respectively;
• wherein a gap is provided between the dust shielding base (27) and the dust shielding bushing (28);
• wherein an air seal passage is provided on the bearing base (30), and wherein the air seal passage is in communication with the gap;
• wherein a first lip seal (33) is provided between the bearing base (30) and the dust shielding bushing (28);
• and wherein the bearing gland (29) is fixedly mounted on an outer surface of the bearing base (30).