RU33194U1 - Mechanical shaft seal (options) - Google Patents

Description

Shaft seal

; ../ option ||) The utility model relates to mechanical engineering, namely to mechanical

seals for sealing the rotating shafts of the units.

Known seal designs of a rotating shaft, in which the sealing movable contact is formed by the elements of the rotating and stationary nodes (a friction pair of antifriction rings) interacting along the sealing belt. The springs in such structures provide contact between the sealing surfaces of the friction pair, since under the action of the pressure of the medium being sealed, the separation fluid and the spring forces, axial forces arise, which press against the antifriction rings. (SU, copyright certificate. No. 176471, 1964, F16J 15/34).

The closest technical solution to the claimed one according to the first embodiment is the design of a single mechanical shaft seal, including a friction pair consisting of a rotating and fixed contact rings (RU Patent No. 2001337, F16 J 15/34, 1998). A rotating contact ring is mounted on the unit shaft by mounting it on a rubber o-ring in a sleeve mounted on the shaft. Not rotating

the contact ring of the friction pair is mounted on the rubber sealing

It is installed in the seal housing and sealed with a collar cuff fixed in the flange bore. The flange with cuff is fixed to the housing with screws.

The closest technical solution to the claimed second

The variant adopts the design of a double mechanical shaft seal, containing two single mechanical end steps arranged in series, the rotating elements of which include a sleeve with sealing antifriction rings installed in it, and the fixed elements consisting of cages and second sealing antifriction rings are made axially movable ( see Attachment).

The disadvantage of such designs of mechanical seals is that through narrow round through holes that are made on the end surface of the sleeve (such holes do not allow large diameters — the location of the grooves under the rubber sealing rings) is difficult, and sometimes cracked or collapsed antifriction rings cannot be removed , which complicates the dismantling and installation of the seal, and also reduces the reliability of its operation.

The technical task of the utility model is to increase the maintainability and reliability of the seal.

The essence of the proposed technical solution (in the first embodiment)

lies in the fact that in the mechanical seal, the sealing contact

elements of a rotating assembly, including a sleeve with an anti-friction sealing ring installed in it, and a fixed assembly, consisting of a second anti-friction sealing ring,

mounted in an axially movable holder fixed in the flange

at least two grooves are made on the outer surface of the annular circumference of the liner circumference (on the side of its end face) to access the sealing antifriction rings. At least two grooves are also made on the outer surface of the annular circumference of the ring.

- The grooves are located symmetrically along the ribs of the circumference of the cage and sleeve and extend in the axial longitudinal direction of the shaft.

The essence of the proposed technical solution (according to the second embodiment) is that in the mechanical seal containing two single end steps, the rotating elements of which include a sleeve made in the form of a sleeve with an annular protrusion in the end, with antifriction rings installed in it, and the fixed elements, consisting of cages and second sealing antifriction rings, are made axially movable on the outer surface

The annular protrusion of the sleeve has longitudinal grooves for access to the sealing antifriction rings.

The grooves are arranged circumferentially symmetrically relative to each other

And in the longitudinal section they have - a shape, the vertical part of which is located between the antifriction rings.

In FIG. 1 presents a single mechanical seal (longitudinal

incision); in FIG. 2 is a view A in FIG. 1; in FIG. 3 - double mechanical seal

(lengthwise cut); in FIG. 4 is a view B in FIG. 1.

Description of the mechanical seal of the shaft according to the first embodiment. A rotating shaft 2, separated from the housing by a mechanical seal, passes through the housing 1 of the unit. A single mechanical seal (Fig. 1) consists of rotating and non-rotating elements. Rotating sealing elements include a sleeve 3 mounted on the shaft with an anti-friction sealing ring installed in it 4. Non-rotating sealing elements, consisting of a second anti-friction sealing ring 5, mounted in an axially movable sleeve 6, fixed in the flange of the unit body 1. On the surface of the annular rib of the circumference of the sleeve 3 (from the side of its end), two grooves 7 are made by milling for access to the sealing antifriction rings. The same grooves 8 are made on the surface of the annular rib of the circumference of the sleeve 6. The grooves 7 and 8 are located symmetrically around the circumference of the sleeve 3 and the sleeve 6 and are elongated in the axial longitudinal direction of the shaft 2. Names have dimensions 10x5x3 mm (Fig. 2). Description of the design of the mechanical seal of the shaft according to the second embodiment.

The double mechanical shaft seal (FIG. 3) contains two single mechanical end stages, the rotating elements of which include a sleeve 3 with anti-friction rings 4 installed therein.

Fixed elements consisting of second sealing

anti-friction rings 5 (located in the cages) are made axially movable. On the outer surface 10 of the annular protrusion 9 of the sleeve 3, two longitudinal grooves 11 are made for access to the sealing antifriction rings located symmetrically relative to each other around the circumference. The grooves 11 in a longitudinal section have a shape, the vertical part of which is located between the anti-friction rings 5 (Fig. 3). Names have dimensions 13 x 5 x 3 mm (Fig. 4).

The sealing elements in the movable and fixed joints are sealed with rubber o-rings.

Mechanical seal operates as follows. During operation of the unit, rotation from the shaft 2 through the sleeve 3 is transmitted to the rotating contact anti-friction ring 4 (or rings 4). The torque arising on the non-rotating antifriction ring (or rings) 5 from the rotating ring of the pair is perceived by the seal body through the pins of the axially movable holder 6. Under the action of the pressure of the medium being sealed or from the separation fluid, axial forces arise, pressing ant} 1 friction rings to each other to a friend and to the support belts of the sleeve and the cage, ensuring tightness of contact

pairs (pairs) of friction of antifriction rings.

To remove the mechanical seal through the grooves 7, 8 or 11, the protrusions of the puller (or other tool) are introduced and removed

cracked or collapsed antifriction rings of a pair (s) of friction, respectively, of a single or double seal. The grooves are enlarged (compared with the round holes of the prototype) due to its shape and location on the seal elements, which makes it convenient to maintain.

This technical solution allows to increase maintainability,

the reliability of the seal and can be used in the manufacture and modernization of mechanical seals vrasha; ta sha shafts of units.

Claims (7)

1. A mechanical shaft seal containing a single mechanical end stage, the sealing contact of which is formed by elements of a rotating assembly, comprising a sleeve with a sealing antifriction ring installed in it, and a fixed assembly consisting of a second sealing antifriction ring mounted in an axially movable cage fixed in the flange unit body, characterized in that at least two grooves are made on the surface of the annular rib of the circumference of the sleeve. 2. The mechanical seal according to claim 1, characterized in that at least two grooves are made on the surface of the annular rib of the circumference of the cage. 3. The mechanical seal according to claims 1 and 2, characterized in that the grooves are located symmetrically about each other around the circumference. 4. Mechanical seal according to claims 1 to 3, characterized in that the grooves are elongated along the axis of the shaft. 5. A mechanical shaft seal containing two single mechanical end steps, the rotating elements of which include anti-friction rings installed in a sleeve made in the form of a sleeve with an annular protrusion at the end, and the fixed elements consisting of cages and second anti-friction rings axially movable, characterized in that longitudinal grooves are made on the outer surface of the annular protrusion of the sleeve. 6. The mechanical seal according to claim 5, characterized in that the grooves in the longitudinal section have

form. 7. Mechanical seal according to claims 5 and 6, characterized in that the grooves are arranged symmetrically about each other around the circumference.