FIELD: engines and pumps.
SUBSTANCE: pump includes cylinder with plunger, which consists of two parts of various diameter. It has suction and delivery valves and sealing device made in the form of tightly closed cavity filled with lubricating liquid, formed with side surface of plunger and annular projections on inner side of cylinder, which are located in middle part of cylinder and provided with sealing rings interacting with side cylindrical surface of plunger. Length of plunger is equal to or more than sum of lengths of tightly closed cavity and maximum plunger stroke. Passage point of plunger diameters is located in tightly closed cavity with lubricating liquid.
EFFECT: increasing operating efficiency at high-viscosity liquid pumping-out.
4 cl, 2 dwg
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RU2550842C1 |
