| 摘要 |
FIELD: manufacture of pumps. SUBSTANCE: pump has impeller 1 with hub 3 rigidly fitted on shaft 4. Edges of impeller 1 on side of drive rotate at small clearance 2 above rear wall 5 of pump housing. It forms labyrinth clearance 6 together with impeller 1. Labyrinth clearance 6 is used for connection of pump chamber 2 with chamber 7 of hub. Chamber 7 of hub is provided with additional coaxial impeller rigidly connected with impeller 1; additional impeller is used for intensification of rotary motion of liquid and its discharge. Chamber 7 of hub is provided with peripheral hole 12 for outlet of liquid. Air accumulating in zone of shaft 4 escapes through clearance 10 formed by wall 20 of hub body and shaft 4. Peripheral hole 12 is located in wall 20 of hub body and is made in form of pressure nozzle. It terminates in chamber 11 adjoining chamber 7 of hub and connected with it by means of clearance 10. It is directed to diffuser tube 13 forming jet pumps 12 and 13 though which liquid escaping from chamber 7 of hub flows. EFFECT: enhanced reliability. |
