| 摘要 |
A dosing pump includes a distribution unit with an input shaft and a valve and a dosing section being coaxial with it, which consists of a stator with internal gears and rotor with external gears connected with it. The built-up cardan shaft has two coaxial end parts, one of which is connected with the valve of distribution unit, and the second - with the rotor of dosing section. End parts are fixed relative to each other with possibility of mutual elastic turning in both directions of rotation within the limits of rotational play between them through intermediate part being coaxial with them, which has from two sides the end lugs, which are located in the spaces between similar end lugs of end parts so that some of two lateral faces of the lugs of intermediate part are forced against lateral faces of the appearances of final parts being adjacent with them by means of preliminarily deformed elastic elements in the form of compression springs with formation between opposite lateral faces of these lugs of rotational play. The effort of preliminary deformation of elastic elements is selected in such a manner that the torque required for its overcoming exceeds the torque on the cardan shaft in normal mode of operation of dosing pump, and at the same it is smaller than the torque on the input and, correspondingly, cardan shafts in pumping mode of its operation. This embodiment of dosing pump ensures the stable fixation of the end parts of built-up cardan shaft relative to each other without any phase misalignment in the operation of distribution unit and dosing section.
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