Krasnova A.Y., Miroshnikova V.V., Isupova I.V., Ivanov P.A., Usova E.V.

Method for restoring the volumetric feed of a rotary vacuum pump

It is shown that rotary vacuum pumps, which are simple in design, more reliable in operation, have a lower metal consumption and cost, have found the greatest use in milking installations of dairy farms of various forms of ownership and sizes of dairy livestock. However, they also have significant disadvantages. One of them is the reduction of the pump supply in the process of increasing the operating time. This leads to a violation of the vacuum mode of operation of milking machines and the stability of the working process of the milking unit, which is often one of the sources of the spread of mastitis diseases in animals. It is established that the known technologies for repairing vacuum pumps by installing them and installing repair sleeves are very expensive and do not allow them to fully restore their technical characteristics in terms of volume production. Analysis of the pump wear as it works has shown that the greatest losses of its supply are caused by an increase in the gap between the rotor and the inner cylindrical surface of the housing in the place where their convergence is greatest. The increase in this gap is due to zonal abrasion of the housing and the removal of metal due to cavitation processes in it. The characteristics of wear on the inner surface of a rotary pump of the plate type are given and the prevailing wear on it along the line of the greatest convergence of the rotor with the body is established. A number of mathematical models of the actual pump supply during its operating time, residual and inter-repair resources are obtained. A method is proposed for repairing the pump and restoring its supply by passing the body with a radius equal to the radius of the rotor at the point where the rotor approaches the body, and then depositing the rotor in this groove to form a working gap. This ensures" contact " of the rotor with the housing not along a single line, but along the arc of a part of the groove circumference and increases its service life until the next repair

Keywords:ROTARY PUMP, WEAR, OPERATING TIME, FAILURE, MILKING UNITS