Rubber stator is easy to wear, and the stator is Screw pump It is one of the key parts of IMO screw pump One of the most important signs of quality. How to extend the life of the stator is an important policy and development direction for planning and manufacturing. In addition to selecting good rubber types, formulas, reasonable rubber constraint process and other elements, the structure of the stator is also appropriate and important.

At present, most rubber stators in our country use solid bodies with uneven wall thickness. The constrained stator "rubber sleeve" is bonded to the metal sleeve with adhesive (that is, the pump body and rubber sleeve are combined into one part stator), so the stator is actually a composite of rubber and metal. In order to make the bonding firm and not easy to fall, in addition to selecting suitable adhesives, some also process relatively fine spiral grooves on the bonding surface of the metal body, and select the structure of rubber flanging on both ends of the metal sleeve to make it not easy to fall. The quality of bonding is usually measured by the bond tensile strength and bond shear strength, which are generally judged according to the measured values and the failure condition of the section. This kind of stator is easy to manufacture, but because the rubber wall thickness is uneven, the shortening rate of the rubber will also be uneven when constrained, and the shortening of the two ends of the stator will be significantly greater than the middle of the stator, which will result in uneven interference, easy wear and other defects when the stator and rotor fit. Generally, the contact surface between the stator and the stator when rotating is about 70%.

In order to prevent dry resistance from scorching the contact surface of the stator, some adopt the structure of filling water inwards: there are some long transverse grooves around the stator, and some small holes are opened to connect the transverse grooves with the inner wall of the stator, the external water source is connected with the solenoid valve, and then the small holes through the metal sleeve on the outer layer of the stator are connected. In this way, when the power source drives the pump, the solenoid valve opens, and the stator hole will be full of water, forming a thin water film between the stator and the screw, and then preventing dry work.