Increase the fitness to work of well sucker-rod pumps with straightening elements of cylinder
The purpose of this development is to maintain the coaxiality of the casing and sleeve and prevention of deflection of the axis during collection, and also the elimination of possible displacements of the sleeve inside the casing in the radial direction in the process of collection and operation. Note that, in the cylinder of well pumps the contact of a gap at a bend of the sleeve with a casing can cause displacement of sleeves in relation to each other as a result of accidental side impact of the casing, or a sudden shock during transportation, or during a downhole. On the other hand, the bending of the cylinder axis can lead to the opening of the sleeve joints and this leads to the penetration of fluid into the space between the casing and the sleeve and then into the plunger space.