Gear diesel pump bearings

(1) The shell part consists of a closed body composed of bearings, shells, safety valves and shaft seals, which bear the pressure of the diesel pump.

(2) The rotor part is composed of a driving screw and two driven screws.

Because the pump outlet pressure is higher, the screw produces axial force.

This force pushes the screw towards the suction end and causes the screw end to wear.

In order to eliminate the axial force, usually on the pump set of drilling and deep hole, a high pressure liquid on the discharge side leads to the master, from the screw on the back end balance piston to balance the axial force on the screw, the radial force is acting on the screw, produced by liquid pressure driven screw symmetrical configuration in active on both sides of the screw, so active screw radial force can be balanced.

For the radial force on the driven screw, usually do not set the hydraulic balance device, just in considering the structural design of the pump, according to the pump inlet and outlet pressure values and the characteristics of the liquid to determine a suitable length of screw work.

(3) the extension end of the bearing part of the screw is provided with a rolling bearing, the remaining axial force on the active screw is not balanced by it, and the remaining axial force of the driven screw is borne by the thrust pad.

(4) shaft seal part of the diesel pump shaft seal is usually mechanical seal, high pressure liquid through the seal chamber and then back to the low pressure chamber, forming a backflow, in order to maintain a certain pressure in the mechanical seal chamber, 1 and take away the friction heat of the mechanical seal moving ring and static ring.

Screw pump shaft seal sometimes also uses packing, leather bowl and other sealing structure.

(5) the safety valve part in order to prevent when the discharge line failure, the pump working pressure suddenly rise and make the pump or motor damage, so there is a safety valve on the pump.

When the outlet pressure exceeds the specified working pressure, the safety valve opens automatically, so that the outlet and the suction population are connected, forming the self-circulation of the medium in the pump, that is, the full reflux and the full reflux time should not be too long, otherwise the pump is easy to heat damage.

The relief valve can only be used as a protection mechanism for short time work sand and can not be used as a flow plate regulating moistening.

The safety valve is mainly composed of a valve body, a valve front cover and a valve back cover.

The valve seat and the seat valve are sealed under the action of the spring, the high pressure chamber and the low pressure chamber are separated, the adjusting rod is used to adjust the spring compression and change the total backflow pressure, the adjusting rod position is adjusted and locked with the nut, and the protective cap is sealed.