SU964318A1 - Thermodynamic end seal - Google Patents

Description

(5) THERMODYNAMIC MECHANICAL SEAL

one

The invention relates to seals for winding shafts of pumps, machines and apparatuses of chemical and other industries.

Hydrostatic mechanical seals are known in which, in order to create a liquid friction mode, the end face of the rubbing pair is pressurized with liquid from an external pressure source l., 0

The disadvantage of these seals is the presence of an autonomous power loop: the liquid of a pair of friction.

A mechanical seal is also known, on the working surface of the ring of which there is a groove made with a smoothly changing depth and communicating with the cavity through the channel extending onto the outer surface of the movable element 2.

A disadvantage of this device is TO7 that abrasive particles get into the gap of a pair of friction from the outer side of the rotating element, and in the hydrodynamic mode of friction there are large leaks 1. The stability of the compaction operation is insufficient. In order to switch to the hydrodynamic mode of friction, this seal requires a significant angular velocity of the shaft and pressure of the medium to be compressed.

The purpose of the invention is to increase the resource and reliability of compaction.

Claims (2)

This goal is achieved by having an axial undercut in the movable ring on the back side with an inner diameter, connected to the rubbing surface of the movable ring with holes that are angled to the friction plane and inclined in the direction of rotation of the movable ring. At the beginning of the holes, the cuts are made on the rubbing surface at an angle smaller than the angle formed by the axis of the hole and the end surface of the movable ring. The orifice, turned in the direction of rotation, captures the compacted fluid, which under the action of the centrifuge; (Noah forces flow through a hole on the face surface of a pair of friction under pressure, somewhat greater pressure of the medium to be condensed. Since the hole torsion is directed in the direction opposite to insertion of the movable ring, the force of inertia is sucked in by the rubbing pair by the end of the hole, turned in the direction of rotation, by the centrifugal force of rotation in from the version and the suction of the end pair of friction, the liquid tends to exit along the end through the outer surface of the ring. made from the inner side of the friction ring reduces the abrasive particles in the friction line by reducing abrasive particles from the inner side of the friction ring due to the centrifugal effect of the rotating shaft. The flow of compacted fluid from the inner diameter of the seal ring to the outer one increases its work seals in hydrodynamic mode, which increases the life of the seal and its reliability. FIG. 1 shows compaction, incision; in fig. 2 is a section A-A on, FIG. one; in fig. 3 node 1 in figure 1; in FIG., k is a section BB in FIG. 2. The seal consists of body 1, a stationary friction ring 2 installed through secondary seal 3 into case 1. The movable ring C is mounted on the shaft 5, on which the adjusting ring 6 is fixed on the screws ax 7. Utifs 8 transmit rotation from the adjusting ring 6 rolling ring. The spring 9 presses the movable ring to the fixed ring 2 friction. Secondary seals 10 and 11 seal the sealing medium on the shaft and seal body. In the movable ring k there are axial groove 12 and through holes 13 connecting the point 12 with the friction surface from the back side. The holes are inclined at an angle p in the direction of rotation of the ring and run at an angle l (i (amounting to 0-75 with a plane perpendicular to the shaft axis. At the beginning of the holes 13, a tsekovka Il is made on the rubbing surface of the ring at an angle Γ, smaller than the angle formed by the axis of the hole and the end surface of the movable ring. The seal works as follows. medium and force. reach the outer diameter of the friction pair. The friction pair operates in the hydrodynamic friction mode. The resource and reliability of the mechanical seal increase. When liquid from the internal diameter of the friction pair to the external one enters, the stability of the seal in the hydrodynamic regime increases. Thus, the invention allows to increase the reliability and service life of the seal by increasing the stability of its operation in the hydrodynamic mode of friction. The invention of the Thermodynamic mechanical seal, including fixed and movable rings of a pair of friction, one of which has holes that connect the back side of the ring to the surface of the friction, and that, in order to increase the life and reliability of the seal, the holes are made a movable ring with an inclination in the direction of its rotation and at an angle from 0 to 75 to the plane perpendicular to the axis of the shaft, and connect the back side of the ring with the coffin made on the friction surface at an angle smaller than the angle Call axle apertures and the end surface of the movable ring. Sources of information taken into account in the examination 1. Blue And, And. Face seals of rotating shafts. M., Mashinostroenie, s, 59, fig. eight, 2. Authors certificate of the USSR Vf 305302, class, F 16 1 15/3, 1969.