SU1613698A1 - Pump seal - Google Patents

Abstract

The invention makes it possible to increase tightness by adjusting the size of the gap in the seal, depending on the value of the pressure drop across it. Split cylinders (RC) 6, 7 are fixed by means of spring elements (PE) 9, 10 on the annular protrusion 1 with the formation of radial gaps 12, 13 with the surface of the axial groove 3. Elastic annular partitions (KP) 11 are installed between the annular protrusion 1 and RC 6 7 and fixed on them with the formation of closed cavities 14. Flat cuffs (M) 8 are installed on RC 6, 7 and placed in labyrinth grooves 5, and holes 15 are made in RC 6, 7. The fluid pressure in closed cavities 14 is regulated in depending on the pressure drop on M 8, which allows to provide about M 8 optimality location in the labyrinth grooves 5. 1 yl.

Description

(54) PUMP SEAL (57) The invention improves the tightness by adjusting the clearance in the seal depending on the magnitude of the pressure drop across it. The split cylinders (RC) 6, 7 are fixed by means of spring elements (PE) 9, 10 on the annular protrusion 1 with the formation of radial clearances 12, 13 with the surface of the axial groove 3. Elastic annular partitions (KP) 11 are installed between the annular protrusion 1 and RC 6 , 7 and fixed on them with the formation of closed cavities 14. Flat cuffs (M) 8 are installed on the RC 6, 7 and placed in the labyrinth grooves 5, and holes 6 are made in the RC 6, 7. The fluid pressure in the closed cavities 14 is regulated depending from the pressure drop to M 8, which allows to provide about M 8 optimality location in the labyrinth grooves 5. 1 yl.

SU ,, 1613698

The invention relates to hydraulic engineering, in particular to seals of rotating parts of pumps.

The purpose of the invention is to increase the tightness by adjusting the size of the gap in the seal, depending on the magnitude of the pressure drop across it.

The drawing schematically shows a pump seal, a longitudinal section.

ί The pump seal contains an annular protrusion 1 made on the impeller · 2 of the pump, an annular axial groove 3 in the pump housing 4, covering the protrusion 1 and equipped with labyrinth grooves 5 on 1 cylindrical surfaces. The seal is equipped with two elastic split cylinders 6, 7 of different diameters, flat cuffs 8, spring elements 9, 10 and elastic annular partitions 11. The split cylinders 6, 7 are fixed by means of spring elements 10 on the annular protrusion 1c of its outer and morning sides with the formation of radial gaps 12, 13 with the surface of the axial groove 3. Elastic annular baffles 11 are installed between the protrusion 1 by the split cylinders 6, 7 and fixed, them with the formation of closed heels 14. Flat cuffs 8 are installed. split cylinders 6, 7 and are placed in the birint grooves 5, and holes 15 are made in the split cylinders 6, 7, communicating closed cavities 14 with radial clearances 12, 13.

qi mi mi mi

9, int DI and

n'l lo na'la: The seal works as follows.

When the working scaffold 2 is stationary, the seal occupies the initial creep, with spring elements 9, 10, separate cylinders 6, 7 are retracted outwardly from the protrusion 7, on which all the main control elements of the seal are mounted. With the spring elements 9, 10, the cuffs 8 are pressed with very little effort to the surfaces of the grooves 5. When the hydraulic machine is turned on, it is created in its internal cavity, as a result of which the water begins to reduce pressure, filter with a low flow rate, which are reduced compared to traditional labyrinth seals from due to lack of gaps. To prevent significant changes in the operating modes of the sealing elements, closed cavities 14 with a stepwise change in pressure in them are made. At the same time, due to the oncoming movement of the filtration flow in the area Ρ1-Ι-участке4 with respect to the _10th section Pb + Pb, the dimensions of the seals sharply decrease and the material consumption of the machine as a whole decreases. The location of the holes 16 is controlled by the amount of compression of the seals for specific machines and their operating modes. The protrusions 1 with its elements 15 under certain operating conditions of the machine can also be located on the housing 1, and the grooves 5 and the groove 3 in this case are performed in the impeller 2.

Claims (1)

2θ Claims A pump seal, comprising an annular protrusion made on the impeller of the pump, an annular axial groove in the pump casing, covering the protrusion and provided with labyrinth grooves on cylindrical surfaces, characterized in that, in order to increase the tightness by adjusting the amount of clearance in the seal depending on the size differential pressure on it, the seal is equipped with 30 two elastic split cylinders of various diameters, flat cuffs, spring elements and elastic ring partitions, etc. this split cylinders are fixed by means of spring elements on the annular protrusion from the outer and inner sides with the formation of radial gaps with the surface of the axial groove, elastic annular partitions are installed between the protrusion and split cylinders and are fixed on them 40 with the formation of closed cavities, flat cuffs are mounted on split cylinders and placed in labyrinth grooves, and holes are made in the split cylinders, communicating closed cavities with radial gaps.