SU59305A1 - Gland for sealing the protruding portion of the shaft - Google Patents

Description

Nowadays, in mechanical engineering mainly in automotive engineering, self-squeezing seals with leather cuffs and a spring are widespread.

Working under appropriate conditions is very good, these glands still have the following significant drawbacks.

They cannot work at temperatures above 60 °, since the skin becomes unusable, does not guarantee proper sealing in the presence of a radial displacement of the shaft, and, finally, does not allow the replacement of a flex cup or other part without destroying the entire stuffing box.

In the proposed self-locking gland. The indicated deficiencies are eliminated.

This gland is intended to seal the protruding portion of the shaft from the housing, using a sealing element that is pressed against the springs in the axial direction.

According to the invention, the sealing element, together with the shaking springs, is placed in a hollow annular cage, open from the front side and from one of the side surfaces of the sealing element.

Such a device makes it easy to dismantle the stuffing box and allows you to replace the skin that is usually used in stuffing boxes with simple felt.

In FIG. I shows a cross-section of the gland of the device proposed, mounted on the part of the shaft protruding from the housing; FIG. 2 — another form of its implementation; FIG. 3 shows the main part of the device of FIG. one; FIG. 4 and 5 are a plan view and a side view of a combined spring part prepared from one piece of wire; FIG. b - another embodiment of this part in a section along I - 1 of FIG. 7; FIG. 7 is a view of the same part in plan and in section along C-C of FIG. 6

The gland body 1 is pressed onto the shaft and rotates with it and has the shape of a hollow annular cage, open from the front side, with one annular wall of the cage shorter than the other.

A spring 2 is loosely inserted into the housing 1, which has a special design and is shown separately in FIG. 4, as well as an annular ring 3 and a felt ring 4, one side surface of which is not covered by an annular ring.

The felt ring is supplied with some tension on the outer and inner diameters in order to create a density that prevents the penetration of oil to the outside and dirt on the bearing. But at the same time, the felt ring should move in the axial direction under the action of the force of the compressed spring.

In the mounted in place of the gland spring pushes through the washer 3 on the felt ring 4 and presses it against the fixed disk 5 installed in the bearing cap.

When the machine is in operation, the felt ring is rubbing against the face of the polished surface of the disk 5, creating a reliable contact.

To prevent oil sucking through the pores of the felt itself, it is advisable to use semi-coarse wool felt impregnated with some kind of a holding solution, for example, nitrolacom.

Spring 2 gland, as shown in FIG. 4, consists in fact of several coil springs wound from a single piece of wire.

This design allows the springs to be reliably installed in the desired position without additional details.

The sizes and the number of spirals for each bearing size are chosen such that the pressure of the felt on the disk is not higher than, for example, 0.6 kg / cm with new parts and no less than 0.2 kg / cm with the most worn felt.

FIG. 2 shows the structure of the gland, in which its body 1 is inserted into the bearing cap and the disk 5 is mounted on the shaft.

Such a design may be required according to the installation conditions of the machine assembly.

FIG. 6 and 7 show the device using separate coil springs that are attached to the thrust washer 3 by gripping it with the extreme turns of the springs. In the place of installation of each spring 6 on the washer 3

There is a cutout 7, and the washers in this place are curved, so that the springs are installed perpendicularly to the washer 3 and cannot leave their seats.

In order to prevent the springs from stalling, the washer 3 is kept from turning it in the housing by two projections 8 of the wall of the housing 1, which are included in corresponding recesses along the periphery of the washer.

The subject matter of the invention.

Seal for sealing the protruding part of the shaft using the sealing element, pressed by the springs in the axial direction, characterized in that, for the convenience of its installation, the sealing element together with the clamping, THEM springs are placed in the hollow ring holder, open from the front side and from the side of one of the side surfaces of the sealing element.

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