Main sealing oil pump HSNDF280-43N has hydraulic balance of rotor, small vibration and low noise; stable output, no pulsation; high pressure and high efficiency; strong self-priming ability; horizontal installation; compact structure, small volume and light weight, which can work at higher speed; minimal mechanical friction, slight wear and tear, and long service life. The heating or cooling structure can also be provided according to the need of the conveying medium.