ROTARY VACUUM PUMP OF HOSE TYPE Russian patent published in 2013 - IPC F04B43/12 

FIELD: engines and pumps.

SUBSTANCE: pump includes a housing with outlet branch pipes and an inlet branch pipe: in side cover plate, elastic hoses, a rotor with rollers contacting the elastic chamber and device for adjustment of compression degree of elastic hoses with each roller. The pump housing has three sections representing independent devices for receiving negative pressure created with vacuum of different depth. Each of those sections provides the operation of different assemblies of the milking machine. The elastic hose located in the first pump section performs air intake in the pump stator cavity, and connection to the vacuum system is performed through the connection pipe with a check valve in the pump cover plate. Inner cavity of the second section is connected to inner cavity of the first section by means of a bypass valve. Negative pressure degree created with vacuum in the pump sections, passage through the bypass valve in partitions between sections is reduced to the value that is required for operation of a milk pipeline and a vacuum pipeline. Degree of vacuum negative pressure in the pump sections corresponds to negative pressure value obtained in each pump section and controlled due to action of bypass valves.

EFFECT: when using the described pump, pressure inside and outside the hose located in the pump sections is equalised, which allows using an elastic hose with wall thickness that is smaller than that in similar designs; increasing the supply, reducing the power costs for movement of rollers and enlarging the service life of elastic chambers.

2 cl, 2 dwg