SU1213295A1 - End seal - Google Patents

Description

The invention relates to pump engineering and compressor engineering, in particular, to mechanical seals of rotating shafts, and may find application in structures operating at high pressures of densified media.

The purpose of the invention is to increase the reliability of the mechanical seal by reducing leakage.

FIG. 1 shows the face seal 1 and 6 are in contact with each other and are axially displaced to the extreme position, while the secondary seal 7 is in contact with the conical surface of the ring 6 at a smaller diameter.

An increase in pressure in the annular groove 4 above the average value causes both contact rings to move under the effect of pressure in cavity 3 on ring 1. As ring 6 moves

with a secondary seal, the size of the secondary seal slides along the tapered shaft and in the housing; in fig. 2 - the same, the secondary seal is placed in one of the slip rings. The face seal consists of a contact ring I, located in the encapsulation of the fluid being compressed onto the ring 6. Moving the ring 6 causes relative movement of the secondary seal 7

which surface At the same time, the effort opposing the movement of the rings increases, and at some moment their balance comes

When the pressure of the fluid in the tank 2 decreases with the formation of the closed annular 5 stroke, the contact-cavity 3 moves backward. The contact ring 5 has a conical surface that is matched by Q to the occurrence of contact by a large secondary seal 7. For a preliminary conical surface. This leads to the pressure of the rings in the cavity 3 to reduce the magnitude of the contact pressure; elastic elements 8 are not installed. In a certain position of the rings, the Secondary Seal 7 should have an equilibrium that in this design, provides, hermetically, the case is more determined by the relative displacement of 25 by the force of the elastic elements 8. since it is made in the form of a hermetic piston, the increase in pressure in the gap (which is a pre-ring, the opening of the joint proceeds) causes a displacement of the rings and the corresponding magnification

the action of other elements on contact

the rings 1 and 6 are in contact with each other and are axially shifted to the extreme position, while the secondary seal 7 is in contact with the conical surface of the ring 6 on a smaller diameter.

An increase in pressure in the annular groove 4 above the average value causes both contact rings to move under the effect of pressure in cavity 3 on ring 1. As ring 6 moves

condensate fluid on the ring 6. Moving the ring 6 causes the relative movement of the secondary seal 7

In the tact, the reverse movement of the contact rings occurs under the action of forces due to the pressure of the contact over a large diameter of the conical surface. This leads to a decrease in the contact pressure. In a certain position of the rings, an equilibrium occurs, which in this case is largely determined by the force of the elastic elements 8. The opening of the contact pair is eliminated, since the increase in pressure in the gap (which precedes the opening of the joint) causes the rings to move and the corresponding increase

efforts of their mutual pressure.

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FIG.

Editor V. Pstrash Order 770/49

(HOSTAPSIT.CH iO. Tolsky TS.CHRED I. Perekorrektor S. Cherni

Circulation 880 Subscription

VNIIPI USSR State Committee

for discovery inventions

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

777

FIG.

Claims (3)

1. END SEAL, containing an axially movable friction pair, one of the rings of which is located in the cage, is spring-loaded and forms a closed annular cavity communicating with axial holes with an annular groove on the working end of the ring, and a secondary seal, characterized in that, for the purpose of increase the reliability of the seal by reducing leakage, the surface of the element of the pair associated with the secondary seal is made conical with the direction of the taper, ensuring the equilibrium of the friction pair when changing Hell pressure on the seal. 2. Seal by π. 1, characterized in that when placing the secondary seal on the shaft or in the housing, the mating conical surface of the contact ring is directed by the apex towards the working end. 3. Seal by π. 1, characterized in that when placing the secondary seal in one of the contact rings, the mating conical surface of the shaft or housing is directed with the apex away from _the working end. ® y from u to s>