SU1320577A1 - Hydrodynamic radial seal of shaft - Google Patents

Abstract

The invention relates to hydraulic machine building and makes it possible to increase reliability by automatically controlling the speed of rotation of the radial blades. The seal is equipped with a ratchet coupling placed between the impeller disk 3 and the leading magnetic coupling half 4, and the torsion spring 9. The disk 3 is rotatably mounted and connected to the shaft 2 via a spring 9. A change in the operating mode of the rotary machine causes the displacement of the phase boundary in the seal and a change in the torque transmitted from the shaft 2 to the disk 3. As a result, the rotation frequency changes blades 5 and, accordingly, the injection capacity of the impeller. 2 Il. (L with ND O SP Fig. 1

Description

The invention relates to hydraulic engineering, in particular to hydrodynamic seals of rotary machines.

The purpose of the invention is to increase reliability by automatically controlling the speed of rotation of the radial blades depending on the magnitude of the torque on the impeller disk.

FIG. 1 schematically depicts a radial seal; in fig. 2 shows section A-A in FIG. one.

Hydrodynamic radial shaft seal, containing its body 1, mounted on shaft 2 impeller disk 3 with spring-loaded drive half coupling 4 mounted with axial displacement and fixed against rotation relative to shaft 2, radial blades 5 with driven magnetic coupling half b mounted on the bearing 7, housed in housing 1.

The seal is equipped with a ratchet clutch 8 placed between the impeller disk 3 and the leading magnetic coupling 4, and the torsion spring 9, the impeller disk 3 is rotatably mounted and connected to the shaft 2 through the torsion spring 9, and the leading magnetic coupling half 4 is spring loaded to the impeller disk 3.

The device works as follows.

When the rotor machine is operating in the design mode, the roll-down of the shaft 2 and the optimal location of the phase boundary is provided by the geometrical and operating parameters of the impeller.

The torque transmitted from the shaft 2 through the torsion spring 9 to the impeller disk 3 has a certain value.

When the operating mode of the rotary machine changes, the phase boundary in the seal moves and the torque from the shaft 2 to the disk 3 changes.

The rotational speed of the blades 5 is determined by the axial distance between the magnetic coupling halves 4 and 6, therefore when the interface moves to the shaft 2, the torque on the disk 3 increases. Disk 3, breaking the spring force

five

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five

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five

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9, rotates relative to shaft 2, which, due to the ratchet clutch 8, causes axial movement of the leading coupling half 4 and a change in the axial distance between coupling half 4 and 6, which decreases with increasing torque, which increases the speed of rotation of the blades 5, due to which makes the impeller's injecting capacity increase and the phase boundary moves to its initial initial position. When moving the phase boundary to the periphery of the disk 3, the torque on the disk 3 decreases, which causes the drive half of the coupling shaft 2, due to the ratchet clutch 9, to rotate the disk 3 relative to the shaft 2 in the opposite direction. , the axial distance between the sleeves 4 and b increases, which reduces the rotational speed of the blades 5, thereby reducing the impeller's injection capacity and the phase boundary to the original optimal position.

Claims (1)

Invention Formula Hydrodynamic radial shaft seal, comprising a housing, an impeller disk with a spring-loaded magnetic coupling half mounted axially and fixed from rotation relative to the shaft, mounted on the shaft, radial blades with a driven magnetic half coupling mounted on the liner located in the housing, differing from that, in order to increase reliability by automatically adjusting the speed of rotation of the radial blades depending on the magnitude of the torque on the disk, the seal is equipped with a ratchet coupling placed between the impeller disk and the leading magnetic coupling half, and. torsion spring, and the impeller disk is installed with possible. rotation and is connected to the shaft through a torsion spring, and the drive magnetic coupling half is spring-loaded to the impeller disk. US 2 ViiIPizakaz 2642/40 Circulation 81 1 Subscription Production-110.1 graphic enterprise, Uzhgorod, st. Design. four