SU366295A1 - no compromise - Google Patents

Description

one

The invention relates to seals, in particular to mechanical seals, j

Mechanical seals containing rotating and stationary rings are known.

The purpose of the invention is to provide a stable liquid film between the rings.

For this, face weighing is carried out not only by hydrostatic, but also by hydrodynamic forces, which arise during the rotation of the movable ring. This is ensured by the fact that at the end of one of the rings there are deaf radial grooves with a depth comparable to the thickness of the liquid film, and from the deaf portion of the radial grooves in the direction of rotation there are deaf grooves with a depth less than the depth of the radial grooves.

The drawing shows the proposed seal.

A rotating ring 2 is fixed on the shaft / fixed, compacted and compressed, and the fixed ring 4 is fixed and condensed in the housing 3. The rotating ring 2 has a working plane A, and the fixed ring 4 is a plane B separated by a “work of Si gap from plane A.

On the plane B, there are deaf radial grooves a with a depth of 62, from which along the middle circumference of the ring in their end portion

detour grooves b with depth bz smaller b2.

The seal separates the cavity with the pressure PI from the cavity with the pressure PZ () The sealing of the rotating ring 2 relative to the shaft / carried out according to the diameter DI, the sealing of the ring 4 relative to the housing 3 according to the diameter DZ. The working planes of rings 2 to 4 are limited to diameters DZ and D4.

The gap ba is commensurate with the gap 6i (i.e., the gaps are within a single order).

During the operation of the seal, the fluid is under pressure PI, throttling in the gaps of the blind deafs

radial grooves 5, enters the blind grooves in the ring 4. Under the action of the spring and the differential pressure PI-PZ on the working area of the compaction plane L and tends to converge. Reducing the gap 6i leads to an increase in pressure in the deaf grooves b by reducing leakage in the seal. With a certain gap 6i iBce, the forces acting on rings 2 and 4 will be balanced.

When the shaft rotates, the fluid from the deaf

radial grooves a is injected into the blind grooves b and increases the pressure in these grooves, and with it the stiffness of the film 6i, increasing the reliability of compaction. Any skew of the plane A relative to the plane B under

The dynamic moment arising from the pressure cushion in the deaf grooves b corresponds to the action of dynamic forces or technological factors, which corresponds to a reduced clearance and tends to eliminate lerekos.

Subject invention

Face seal containing rotating and stationary rings, characterized by

By the fact that, in order to provide a stable liquid film between the rings, deaf radial grooves are made at the end of one of the rings with a depth comparable to the thickness of the liquid film, and deaf grooves are made from the deaf part of the radial grooves with a depth smaller than the radial grooves depth .