RU1788369C - Shaft end seal - Google Patents

Abstract

SUMMARY OF THE INVENTION: The rotary element of the main mechanical seal is fixed to the shaft with a fastening nut, which is threadedly connected to the shaft, bolts with an auxiliary element mounted on the thread on the rotary element. In the chamber between the auxiliary and the main seal, inlet and outlet channels for the closure medium are made. The auxiliary element is made in the form of a sleeve hermetically mounted on the shaft. The threads of the sleeve and the fixing nut are made in the opposite direction. The diameter of the nut does not exceed the diameter of the sleeve. 1 ill.

Description

The invention relates to a sealing technique, in particular to shaft seals comprising primary and secondary seals.

. An end seal is known in which an end seal is used as the main seal and an oil seal is used as the secondary seal. The mechanical seal contains an axially movable element, a rotatable element fixed to the shaft by a fixing nut, which is bolted to an auxiliary nut mounted on the rotatable element.

The disadvantage is the increase in axial dimension, the complexity of installation and maintenance.

The purpose of the invention is to reduce the axial dimension and simplify installation.

The goal is achieved by changing the arrangement of the seal assembly, which consists in the location of the auxiliary seal on the cylindrical surface in the auxiliary sleeve, which is installed tightly instead of the nut on the rotating element of the mechanical seal, while the diameter of the fastening nut should not exceed the diameter of the said sleeve.

The drawing shows a section of the device. . . ..-; .

The seal contains an auxiliary seal f, the main seal 2, the rotating element of which 3 is fixed to the shaft 4 by a fastening nut 5, which is threadedly connected to the shaft 4, and bolts 6 with the auxiliary sleeve 7 mounted on the thread on the rotating element 3. In the chamber 8 between the auxiliary seal 1 and main. 2 made inlet 9 yot00

and

Yu

gate media 10 channels. The outer cylindrical surface of the sleeve 7 is a rotating surface. Auxiliary seal friction pair. The sleeve 7 is sealed on the shaft. The diameter of the fastening nut 5 does not exceed the diameter of the sleeve 7.

Sealing works as follows. .

Before the main seal 2 there is a working medium. Through the channel 10, the shutter medium is supplied into the chamber 8, part of which in the form of a leak through the auxiliary seal 1 enters the environment, and the rest of the shutter medium is mixed with the working leak

medium through the main seal 2 and exits through the channel 10 to the corresponding receiver. When replacing the packing of the seal 1, there is no need to remove the fastening nut 5, since its diameter does not exceed the diameter of the mounting nut. those. bushing diameter 7.. . .

The implementation of the sleeve, placed on the rotating element, under the auxiliary seal provides a compact structure and reduces axial dimensions, and the use of a fastening nut with a diameter not exceeding the diameter of the said sleeve reduces the complexity of installation and maintenance.

Claims (1)

SUMMARY OF THE INVENTION A shaft end seal comprising an auxiliary seal and a main mechanical seal, the rotating element of which is secured to the shaft by a fastening nut which is threadedly connected to the shaft and bolted to an auxiliary element mounted on a thread on the rotating element, and in the chamber between the auxiliary and main the seals are the inlet and outlet channels for the shutter medium, which means that the auxiliary element is made in the form of a sleeve sealed on the shaft y .. in this case, the thread of the sleeve and the fixing nut is made in the opposite direction, and the diameter of the fixing nut does not exceed the diameter of the said sleeve.