SU1208321A1 - Method of hydrodynamic sealing of rotor machine shaft - Google Patents

Description

2. The method according to claim 1, characterized in that the consumption of throttling fluid is inversely proportional to the pressure change before the hydrodynamic compaction.

The invention relates to hydraulic machine building, and more specifically to methods for compacting hydraulic machine shafts.

The purpose of the invention is to increase reliability by providing optimal operating conditions for hydrodynamic compaction on various machine operation modes.

Fig. 1 shows a device for carrying out the method by changing the hydraulic resistance of the sealing channels; - Fig 2, a device for measuring the method of changing the hydraulic resistance of the bypass channels.

Both devices comprise a housing 1, a working wheel 3 mounted on the shaft 2, sealed relative to the housing 1 by sealing channels 4 and connected by bypass channels 5 with a low pressure area 6, and also hydrodynamic sealing

impeller view 7.

The device shown in Fig. 1 contains adjustable channels 8, and the impeller 7 is mounted for axial movement along the flange 2 and is spring-loaded by springs 9 to the impeller 3, forming adjustable channels 8.

The bypass channels 5 (Fig. 2) contain adjustable throttles 10 formed by a washer 11 mounted for axial movement from the aneroid 12 under the action of varying pressure.

The method is implemented as follows.

The fluid is throttled in the channels of the seal 4 and dumped into the low pressure area 6, with this the degree of throttling of the fluid is controlled depending on the mode of operation of the tire, ensuring a constant differential

3, the method according to claim 1, characterized in that the flow rate during discharge varies in direct proportion to the pressure change before hydrodynamic compaction,

0

five

0

five

0

five

pressure on hydrodynamic compaction.

The condition of the differential is provided by a change in fluid flow during throttling (Fig. 1), inversely proportional to the change in pressure before hydrodynamic compaction, or a change in the fluid flow during discharge (Fig. 2), in direct proportional change in pressure.

To ensure that the differential is constant when the flow rate of the throssed fluid changes (Fig. 1), the impeller 7 is mounted on the shaft 2 in a certain neutral position, thus forming an adjustable choke 10 in the sealing channels 4. If the pressure drop on the hydrodynamic seal decreases, for example, when the rotary machine changes its operating mode, the impeller 7 will move to the left under the action of axial forces and increase the gap in the adjustable throttle 10, which will increase the pressure drop on the impeller 7.

; When the pressure differential increases with hydrodynamic compaction, the control is reversed.

This will ensure constant pressure before hydrodynamic compaction.

If the constant of the differential is carried out by changing the flow rate at the time of discharge (Fig. 2), the washer 11 will move in the axial direction and will form adjustable throttles 10 with the channels 5.

The device operates when the pressure changes before the hydrodynamic seal of aneroid 12, which is clamped and decompressed under the action of alternating pressure.

As the pressure increases upstream of the impeller 7, the aneroid 12 will be compressed and the gap in the throttle 10 will increase, which will decrease the pressure before the hydrodynamic compaction. When the pressure decreases,

12083214

The structure works in the opposite way, ensuring that the pressure on the hydrodynamic seal is constant.

Compiled by Yu.Nikitchenko Editor L.Povkhan Tehred A.Ach Corrector A.Zimokosov

Order 226/46 Circulation 587 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Rausho-ka nab., d.4 / 5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Claims (3)

1. METHOD FOR HYDRODYNAMIC SEALING OF A SHAFT OF A ROTARY MACHINE, including throttling of the liquid in the sealing channels, with its subsequent discharge into the low-pressure region. characterized in that, in order to increase reliability, by ensuring optimal operating conditions of the hydrodynamic seal at various operating modes of the machine, the degree of throttling of the liquid is regulated depending on the operating mode of the machine, providing. constant pressure drop on hydro- 2. The method according to claim 1, characterized in that the fluid flow during throttling is changed inversely with the pressure change before the hydrodynamic seal. 3. The method of pop. 1, characterized in that the flow rate of the liquid during discharge is changed directly proportional to the pressure change before the hydrodynamic seal.