What structural measures have been taken to increase the working pressure of the vane pump of the hydraulic press?

In order to improve the performance of the hydraulic press vane pump, the structural measures taken are mainly to ensure that the hydraulic press vanes can reliably contact the inner surface of the stator, and to prevent the contact stress between the two from being too large and causing serious wear.

    In the early stage, the working pressure of the vane pump of the hydraulic press was no more than 6.3MPa. Now, the working pressure of some vane pumps in the world has reached 20-30MPa. To realize high pressure of vane pump, the following two problems must be solved.

    ①Leakage problems on the rotor end face and blade top.

    ②Wear problems on the inner surfaces of the blades and stator.

There are two types of vane pumps in structural design: single-acting and double-acting. The single-acting has an oil inlet chamber and an oil outlet chamber, both of which are on the 180-degree side of the center of the circle. The eccentric force exerts a radial force on the pump shaft. Force load, as the name suggests, is called single-sided force, also called single-acting. The bearings of single-acting oil pumps have a very short life due to the large force. Ball bearings are not suitable. In order to increase the life of the bearings, they are usually used with larger contact surfaces. DU composite bearings or bimetallic copper sleeve bearings. Such bearings can resist large eccentric forces and extend the bearing life. Variable vane pumps and gear pumps are single-acting oil pumps.

The structural design of the double-acting vane pump adopts a 180-degree symmetrical design on the center of a 360-degree circle, that is, the two oil suction chambers are 180-degree symmetrical and the two oil outlet chambers are 180-degree symmetrical. The advantage of this design is that the pump shaft is There is no radial force when transmitting torque, and the force value is almost zero. For this reason, the bearing selected for the pump shaft of the double-acting vane pump can use the simplest ball bearing, which can not only reduce mechanical noise but also reduce rotation resistance. Moreover, it can achieve relatively high ideal values in terms of pressure resistance and service life.