G series screw pump service life is the concern of each user, long service life not only has an important role in normal production operation, but also reduce the production cost of enterprises. So how to extend the service life of the progressive cavity pump? Here we come together to understand it.
Factors Affecting the Life of G Series Screw Pumps
1. The rubber bushing and rotor pressure between the excessive
In the actual movement process, the rubber bushing and the rotor are in a state of interference, making full use of the interference contact, which can reduce fluid leakage. However, when affected by the pressure of the inner wall, sealing chamber pressure difference and other factors, the contact pressure drops, resulting in leakage, thereby reducing the equipment sealing.
2. Structural parameters
Fatigue failure is mainly formed under the influence of alternating stress, generally manifested as low-stress brittle fracture, and the local nature of the change. After a long time of use, the rubber material properties change and produce leakage problems, it is difficult to meet the actual working requirements, therefore, the structure of the equipment has a direct impact on the equipment sealing.
3. Rubber bushing shear stress
Under the influence of interference fit, deformation resistance in the bushing and sealing position to produce contact stress, to ensure that the seal between the two adjacent chambers. Equipment in the operation process, the rotor and the liquid pressure between the shear force will be generated, once more than the strength of the rubber material, will inevitably tear the rubber bushing, thus generating leakage, difficult to meet the production requirements.
Extend the G Series Screw Pump’s Life
1. Appropriate increase in the amount of interference
Screw pump interference mainly refers to the size of the interference fit between the metal rotor and the stator rubber liner. In the specific work, there should be a certain amount of interference between the stator and rotor to ensure the sealing between the closed chamber. Because of this, the value of the interference between the stator and the rotor will affect the performance of the equipment to a large extent. Generally, under the premise that the number of stages does not change, the size of the interference directly determines the pressure-bearing capacity of the chamber, affecting the lifting capacity. The data show that the contact pressure and the pressure inside the chamber show a negative correlation between the trend of change, the greater the pressure inside the chamber, the contact pressure will be reduced. The pressure inside the same chamber will increase with the increase in the amount of interference.
Therefore, when other parameters remain unchanged, the selection of a larger amount of interference screw pump can improve its overall sealing performance and lifting pressure, thereby expanding its scope of use. At the same time, in the production process, can also actively lead to electric screw pumps, in the production of difficult machinery manufacturing and other work, to avoid fluid flow in the screw pump to reduce its operating efficiency.
2. Choose materials with higher hardness
Hardness as the main influence factor of material deformation ability, the greater the elastic value, the easier its corresponding material deformation. In general, the modulus of elasticity and hardness in theory does not exist in an independent relationship, however, from the experimental data can be seen in the modulus of elasticity will increase with the increase in hardness, should be taken into account in its impact on the sealing performance of the single type screw pump. Such as rubber bushing contact pressure and internal pressure is inversely proportional to the former, the larger, the smaller the latter, but the trend of the two changes have consistent characteristics. In addition, the greater the hardness of the rubber bushing, the contact pressure curve position will gradually upward, the corresponding sealing performance will also be improved. Therefore, should choose the hardness of the rubber manufacturing screw pump stator, in order to improve its sealing performance.
The above is the factors affecting the service life of G series screw pumps and the methods to extend the life of the introduction. In summary, the single screw pump sealing performance directly affects the service life of the single screw pump, of course, in addition to this there is a single screw pump operation, screw pump stator rubber sleeve material selection are closely related to the service life of the screw pump, so you need to pay attention to the operation of the single screw pump!
