SU844873A1 - End seal - Google Patents

Description

one

The invention relates to a sealing technique.

Mechanical seals are known, comprising a housing, high and low pressure chambers, a stationary and rotating sealing rings, one compression spring clamping one against another, a holder and a discharge unit ij,

Their disadvantage is low wear resistance at high pressures of lockable medium.

The purpose of the invention is to increase the wear resistance and the expansion of the limits of the operating pressure.

For this, the discharge unit is made in the form of a conical spring-loaded valve installed with the possibility of closing the channel connecting the high-pressure chamber with the low-pressure chamber formed by the housing and the sleeve; jg, the clip being made with a protrusion placed in the low pressure chamber.

FIG. 1 shows a sectional seal; in fig. 2 - dependence of the change in the magnitude of the contact pressure on the pressure of the medium to be compacted.

The face seal includes a housing 1 and a high pressure chamber 2, a stationary ring 3 fixed in the holder 4 and pressed by the spring 5 to the rotating ring 6 mounted on the shaft 7. The cone valve 8 with the compression spring 9 is installed on the floor 1O and 11. In the chamber low pressure 12 there is a protrusion 13 of the holder 4. Compression of the spring 9 is adjusted by a screw 14. The holder 4 is sealed with cuffs 15 and 16 with protective washers 17 and 18. The valve 8 is sealed with ring 19.

Compaction work as follows

As the pressure of the compacted medium rises to a certain value, the cone valve 8 is closed, and the contact pressure in the linearly-friction pair of steam is BT (the OF section in Fig. 2). After reaching the optimum contact pressure, the cone valve 8 opens

Claims (1)

The mechanical seal of the rotating shaft, including the housing, high and low pressure chambers, fixed and rotating sealing rings, pressed against each other by a compression spring, a cage and an unloading unit, characterized in that, in order to increase wear resistance and expand the working pressure limits, the unloading unit is made in the form of a conical spring-loaded valve installed _ the possibility of blocking the channel connecting the high-pressure chamber to the low-pressure chamber formed by the housing and the cage, and the cage is made with a high blunt placed in a low pressure chamber.