SU1464000A1 - Combination seal - Google Patents

Abstract

The invention relates to a sealing technique and can be used to seal rotating shafts. The aim of the invention is to improve the reliability of the seal by protecting the working gaps of the magnetic-liquid seal against the effects of a sealed medium and their unloading. The combined seal consists of a magneto-fluidic seal located in the housing 1 and a non-contact seal in the form of an impeller 8 mounted on a shaft 6 8 2 Ju ,. on the side of the sealed cavity B. A check valve 9 is installed between the impeller 8 and the magneto-liquid seal, which can be open. : it is in the form of an annular elastic element that encloses the shaft and communicates with the pressure source through channels 10, According to the B static mode, tightness between the cavities B and C is provided by a magnetic-liquid seal. When shaft 6 rotates, impeler 8 displaces the sealing medium from cavity A to cavity B, a vacuum is created in cavity A, automatically activates valve 9, connecting cavity A with a pressure source. The working clearances of the magneto-liquid seal are thus prevented from leaching the magnetic fluid 12 and discharged from the pressure of the medium being sealed by 1 GoP, f-ly, 1 sludge. 5- / 3 § (/)

Description

The invention relates to a sealing technique and can be used for sealing rotating shafts

The purpose of the invention is to increase the reliability of compaction by protecting the working gaps of the magneto-liquid compaction from the influence of a sealed medium and their unloading,

The drawing shows the seal, cut,

The seal consists of a housing 1 in which a magnetic system is placed, assembled, for example, of permanent magnets 2, closed by means of a magnetic circuit 3, and ring A with a ring-. Lead grooves that are concentrated. | magnetic flux traters. Between 1 st. magnets 2 are installed 20 | diamagnetic ring 5, the gaps between JKOpnycoM 1, bushings, and magnets 2 are filled with epoxy resin,

A rotating shaft 6 is rigidly fixed with a ferromagnetic ring 7, especially necessary if shaft 6 is made of a non-magnetic material, as well as with small diameters of shafts up to about 30–20 mm, to ensure strength and improve magnetic conductivity. On the shaft 6, there is a worm 8, representing a disk with straight blades on the side adjacent to the magnetic system. 35 Blades are located at a short distance from the shaft, forming a free central part of the impeller in the form of a truncated cone, namely, cavity A, Gap between the paddle MP 40 and the magnetic system is selected from the technological possibilities of carrying out contactless work and is equal to approximately 0.05-0.1 mm. On the shaft 6, in the region of cavity B, a reverse valve 9 is mounted, connected to the axial channel 10 by radial channels P. The valve 9 is a ring of elastic material, covering the shaft with tension, blocking the radial channels. The gap between rings 7 and 4 is filled with mag. Nitric fluid 12 ,.

Seal works as follows. at once.

In the static mode, tightness between the sealed cavity B and cavity C is created by

interaction of the magnetic system and magnetic fluid.

When the shaft 6 rotates, the impeller 8 displaces the sealing medium from cavity A into cavity B, a vacuum is created in cavity A. This automatically triggers valve 9, which facilitates the passage of gas (air) into cavity A through channels 10 and 11, which communicate with the atmosphere or with any source of pressure

The working gaps of the magnetic-liquid seal are isolated from the sealed medium (liquid) and, therefore, are protected from leaching, regardless of the working pressure in cavity B, the working gaps are under lower pressure (on the order of O, 1 - 0.3 bar). all the pressure of cavity B is sensed by the impeller 8, i.e., the unloading of the magnetic-liquid seal

Thus, the proposed seal ensures stable operation in a wide range of speeds, shaft rotation with minimal friction power loss during sealing of liquid and gaseous media.

Claims (1)

The stability of operation does not disturb with increasing speed, but on the contrary, the resistance increases due to the installation of an impeller. The possibility of automatically adjusting the differential pressure acting on the magnetic liquid seal makes it possible to perform it with minimum mass-output characteristics. Invention Formula 1, A combined seal containing non-contact and magnetic-liquid seal installed in a housing, characterized in that, in order to increase sealing reliability, mainly when sealing liquids, it is equipped with a check valve and pressure source, a non-contact seal is made in the form of an impeller mounted on the shaft from the side medium to be sealed, and between the impeller and the magnetic-liquid seal there is a non-return valve connected to the pressure source by means of channels. x in the body of the shaft. 31464000 2, Combined sealing of a ring-shaped elastic element, FCP .1, about T. clearing, vatshayuschy shaft. that the check valve is designed as